diff --git a/apps/web/src/components/factures/ClientCombobox.tsx b/apps/web/src/components/factures/ClientCombobox.tsx
new file mode 100644
index 0000000..243c638
--- /dev/null
+++ b/apps/web/src/components/factures/ClientCombobox.tsx
@@ -0,0 +1,182 @@
+import { useState, useRef, useEffect } from "react";
+import { useQuery } from "@tanstack/react-query";
+import { Search, UserPlus, ChevronDown } from "lucide-react";
+
+import type { Client } from "@rubis/shared";
+import { api } from "@/lib/api";
+import { queryKeys } from "@/lib/queryKeys";
+import { cn } from "@/lib/utils";
+
+/**
+ * ClientCombobox — autocomplete des clients existants avec création
+ * à la volée si aucun ne match.
+ *
+ * Pas Radix Combobox (n'existe pas) ni cmdk (overkill pour V1) — version
+ * maison minimale :
+ *  - Input + dropdown qui s'affiche au focus / typing
+ *  - Filtre case-insensitive sur le nom
+ *  - Click sur une suggestion = sélection (renvoie le clientId au parent)
+ *  - Si rien ne match, option "Créer un nouveau client : « X »"
+ *  - Escape ferme le dropdown
+ */
+type ClientComboboxProps = {
+  value: string;
+  /** clientId si un client existant a été sélectionné, sinon null. */
+  selectedClientId: string | null;
+  onChange: (input: { value: string; clientId: string | null }) => void;
+  placeholder?: string;
+  id?: string;
+  className?: string;
+};
+
+export function ClientCombobox({
+  value,
+  selectedClientId,
+  onChange,
+  placeholder = "Rechercher ou créer un client…",
+  id,
+  className,
+}: ClientComboboxProps) {
+  const [isOpen, setIsOpen] = useState(false);
+  const containerRef = useRef<HTMLDivElement>(null);
+
+  const { data: clients = [] } = useQuery({
+    queryKey: queryKeys.clients.all(),
+    queryFn: () => api.get<Client[]>("/api/v1/clients"),
+    staleTime: 60_000,
+  });
+
+  // Filtre les clients selon la valeur tapée. Si l'utilisateur a déjà
+  // sélectionné un client (selectedClientId), on ne filtre pas.
+  const matches = value.trim().length > 0
+    ? clients.filter((c) =>
+        c.name.toLowerCase().includes(value.toLowerCase()),
+      )
+    : clients;
+
+  const exactMatch = clients.some(
+    (c) => c.name.toLowerCase() === value.toLowerCase(),
+  );
+
+  // Click outside → close
+  useEffect(() => {
+    if (!isOpen) return;
+    const onClickOutside = (e: MouseEvent) => {
+      if (
+        containerRef.current &&
+        !containerRef.current.contains(e.target as Node)
+      ) {
+        setIsOpen(false);
+      }
+    };
+    document.addEventListener("mousedown", onClickOutside);
+    return () => document.removeEventListener("mousedown", onClickOutside);
+  }, [isOpen]);
+
+  const selectClient = (client: Client) => {
+    onChange({ value: client.name, clientId: client.id });
+    setIsOpen(false);
+  };
+
+  const createNew = () => {
+    // L'utilisateur valide la valeur tapée comme nom de nouveau client.
+    onChange({ value: value.trim(), clientId: null });
+    setIsOpen(false);
+  };
+
+  return (
+    <div ref={containerRef} className={cn("relative", className)}>
+      <div className="relative">
+        <Search
+          size={14}
+          aria-hidden="true"
+          className="absolute left-3.5 top-1/2 -translate-y-1/2 text-ink-3 pointer-events-none"
+        />
+        <input
+          id={id}
+          type="text"
+          autoComplete="off"
+          value={value}
+          placeholder={placeholder}
+          onFocus={() => setIsOpen(true)}
+          onChange={(e) => {
+            // Si l'utilisateur retape, on perd la sélection client précédente.
+            onChange({ value: e.target.value, clientId: null });
+            setIsOpen(true);
+          }}
+          onKeyDown={(e) => {
+            if (e.key === "Escape") setIsOpen(false);
+          }}
+          className={cn(
+            "block w-full rounded-default border border-line bg-white",
+            "pl-10 pr-9 py-3 font-sans text-[15px] text-ink placeholder:text-ink-3",
+            "transition-[border-color,box-shadow] duration-150",
+            "focus:outline-none focus:border-rubis focus:ring-4 focus:ring-rubis-glow",
+            selectedClientId && "border-rubis bg-rubis-glow/30",
+          )}
+        />
+        <ChevronDown
+          size={14}
+          aria-hidden="true"
+          className="absolute right-3.5 top-1/2 -translate-y-1/2 text-ink-3 pointer-events-none"
+        />
+      </div>
+
+      {isOpen && (
+        <div
+          role="listbox"
+          className={cn(
+            "absolute z-20 mt-1 w-full max-h-[260px] overflow-y-auto",
+            "rounded-card border border-line bg-white shadow-card p-1",
+          )}
+        >
+          {matches.length === 0 && value.trim().length === 0 && (
+            <p className="px-3 py-4 text-[13px] italic text-ink-3 text-center">
+              Aucun client encore. Tapez pour en créer un.
+            </p>
+          )}
+
+          {matches.map((c) => (
+            <button
+              key={c.id}
+              type="button"
+              role="option"
+              aria-selected={selectedClientId === c.id}
+              onClick={() => selectClient(c)}
+              className={cn(
+                "flex w-full items-center justify-between gap-2 rounded-default px-3 py-2",
+                "text-left text-[14px] text-ink hover:bg-cream-2",
+                selectedClientId === c.id && "bg-rubis-glow text-rubis-deep",
+              )}
+            >
+              <span className="truncate">{c.name}</span>
+              {c.email && (
+                <span className="shrink-0 text-[11.5px] text-ink-3 truncate">
+                  {c.email}
+                </span>
+              )}
+            </button>
+          ))}
+
+          {value.trim().length >= 2 && !exactMatch && (
+            <button
+              type="button"
+              onClick={createNew}
+              className={cn(
+                "flex w-full items-center gap-2 rounded-default px-3 py-2",
+                "text-left text-[13.5px] text-rubis hover:bg-rubis-glow",
+                matches.length > 0 && "border-t border-line mt-1",
+              )}
+            >
+              <UserPlus size={14} aria-hidden="true" />
+              <span>
+                Créer le client{" "}
+                <strong className="font-semibold">« {value.trim()} »</strong>
+              </span>
+            </button>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
diff --git a/apps/web/src/components/factures/Dropzone.tsx b/apps/web/src/components/factures/Dropzone.tsx
index e183296..d841c29 100644
--- a/apps/web/src/components/factures/Dropzone.tsx
+++ b/apps/web/src/components/factures/Dropzone.tsx
@@ -24,6 +24,8 @@ type DropzoneProps = {
   onFiles?: (files: File[]) => void;
   /** Mode chargement : disable input + remplace le call to action par un spinner. */
   isUploading?: boolean;
+  /** Callback du bouton "Saisir manuellement" (variant full uniquement). */
+  onManualEntry?: () => void;
   className?: string;
 };
 
@@ -52,6 +54,7 @@ export function Dropzone({
   maxFiles = 20,
   onFiles,
   isUploading = false,
+  onManualEntry,
   className,
 }: DropzoneProps) {
   const [isDragging, setIsDragging] = useState(false);
@@ -169,8 +172,13 @@ export function Dropzone({
         >
           <FolderOpen size={14} aria-hidden="true" /> Parcourir mes fichiers
         </Button>
-        {isFull && !isUploading && (
-          <Button variant="ghost" size="sm" type="button">
+        {isFull && !isUploading && onManualEntry && (
+          <Button
+            variant="ghost"
+            size="sm"
+            type="button"
+            onClick={onManualEntry}
+          >
             <FilePlus size={14} aria-hidden="true" /> Saisir manuellement
           </Button>
         )}
diff --git a/apps/web/src/components/factures/ManualInvoiceDialog.tsx b/apps/web/src/components/factures/ManualInvoiceDialog.tsx
new file mode 100644
index 0000000..2a39691
--- /dev/null
+++ b/apps/web/src/components/factures/ManualInvoiceDialog.tsx
@@ -0,0 +1,403 @@
+import { useEffect } from "react";
+import { useForm } from "@tanstack/react-form";
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { Paperclip } from "lucide-react";
+import { toast } from "sonner";
+import { z } from "zod";
+
+import type { Plan } from "@rubis/shared";
+import { api } from "@/lib/api";
+import { queryKeys } from "@/lib/queryKeys";
+import { Button } from "@/components/ui/Button";
+import {
+  Dialog,
+  DialogClose,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/Dialog";
+import { Field } from "@/components/ui/Field";
+import { Input } from "@/components/ui/Input";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/Select";
+import { ClientCombobox } from "./ClientCombobox";
+
+/**
+ * Saisie manuelle d'une facture (cf. wireframe 2.3).
+ * Modal Radix Dialog avec form local TanStack Form + validateurs Zod par
+ * champ (plus pratique que le validator global vu les contraintes de typing
+ * imposées par TanStack Form sur le mapping schema↔defaultValues).
+ *
+ * Échéance gérée en RELATIF (15/30/45/60/90 jours après émission) car
+ * c'est plus rapide que calculer une date — cf. annotation wireframe.
+ * À la soumission, on convertit en absolu.
+ */
+
+const RELATIVE_DUE_OPTIONS = ["15", "30", "45", "60", "90"] as const;
+type RelativeDueDays = (typeof RELATIVE_DUE_OPTIONS)[number];
+
+const RELATIVE_DUE_LABELS: Record<RelativeDueDays, string> = {
+  "15": "15 jours après émission",
+  "30": "30 jours après émission (standard)",
+  "45": "45 jours après émission",
+  "60": "60 jours après émission",
+  "90": "90 jours après émission",
+};
+
+type FormValues = {
+  clientName: string;
+  clientId: string | null;
+  numero: string;
+  amountTtcCents: number;
+  issueDate: string;
+  relativeDueDays: RelativeDueDays;
+  planId: string;
+};
+
+// Validateurs par champ (TanStack Form supporte le validator par champ via
+// validators.onChange, et le typing est plus clean qu'avec un schema global).
+const validators = {
+  clientName: z
+    .string()
+    .min(2, "Au moins 2 caractères")
+    .max(120, "120 caractères max"),
+  numero: z
+    .string()
+    .min(1, "Numéro requis")
+    .max(50, "50 caractères max"),
+  amountTtcCents: z
+    .number({ invalid_type_error: "Montant invalide" })
+    .int()
+    .positive("Le montant doit être positif"),
+  planId: z.string().min(1, "Choisissez un plan"),
+};
+
+type ManualInvoiceDialogProps = {
+  open: boolean;
+  onOpenChange: (open: boolean) => void;
+};
+
+export function ManualInvoiceDialog({ open, onOpenChange }: ManualInvoiceDialogProps) {
+  const queryClient = useQueryClient();
+
+  const { data: plans = [] } = useQuery({
+    queryKey: queryKeys.plans.all(),
+    queryFn: () => api.get<Plan[]>("/api/v1/plans"),
+    staleTime: 60_000,
+    enabled: open,
+  });
+
+  const createMutation = useMutation({
+    mutationFn: (input: FormValues) => {
+      const issueDate = new Date(input.issueDate);
+      const dueDate = new Date(issueDate);
+      dueDate.setDate(dueDate.getDate() + Number(input.relativeDueDays));
+      return api.post(`/api/v1/invoices`, {
+        clientId: input.clientId ?? undefined,
+        clientName: input.clientName,
+        clientEmail: null,
+        numero: input.numero,
+        amountTtcCents: input.amountTtcCents,
+        issueDate: issueDate.toISOString(),
+        dueDate: dueDate.toISOString(),
+        planId: input.planId,
+      });
+    },
+    onSuccess: () => {
+      void queryClient.invalidateQueries({ queryKey: queryKeys.invoices.all() });
+      void queryClient.invalidateQueries({ queryKey: ["invoices", "counts"] });
+      void queryClient.invalidateQueries({ queryKey: queryKeys.dashboard.kpis() });
+      void queryClient.invalidateQueries({ queryKey: queryKeys.clients.all() });
+      toast.success("Facture créée. + 1 rubis.");
+      onOpenChange(false);
+    },
+    onError: () => {
+      toast.error("Création impossible. Vérifiez les champs.");
+    },
+  });
+
+  const today = todayISO();
+  const defaultPlanId = plans.find((p) => p.slug === "standard-30j")?.id ?? plans[0]?.id ?? "";
+
+  const initialValues: FormValues = {
+    clientName: "",
+    clientId: null,
+    numero: "",
+    amountTtcCents: 0,
+    issueDate: today,
+    relativeDueDays: "30",
+    planId: defaultPlanId,
+  };
+
+  const form = useForm({
+    defaultValues: initialValues,
+    onSubmit: async ({ value }) => {
+      // Validation finale sur tous les champs avant submit. Si un champ est
+      // invalide, on toast et on n'appelle pas l'API.
+      const checks: Array<[keyof FormValues, z.ZodTypeAny]> = [
+        ["clientName", validators.clientName],
+        ["numero", validators.numero],
+        ["amountTtcCents", validators.amountTtcCents],
+        ["planId", validators.planId],
+      ];
+      for (const [key, schema] of checks) {
+        const r = schema.safeParse(value[key]);
+        if (!r.success) {
+          toast.error(r.error.issues[0]?.message ?? "Champ invalide");
+          return;
+        }
+      }
+      await createMutation.mutateAsync(value);
+    },
+  });
+
+  // Reset à chaque ouverture (et synchronise defaultPlanId une fois les
+  // plans chargés — premier render le tableau peut être vide).
+  useEffect(() => {
+    if (open) form.reset(initialValues);
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [open, defaultPlanId]);
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent maxWidth={560}>
+        <DialogHeader>
+          <DialogTitle>Nouvelle facture</DialogTitle>
+          <DialogDescription>
+            Saisie manuelle — pour les factures que vous avez sous la main mais
+            sans PDF à OCRiser.
+          </DialogDescription>
+        </DialogHeader>
+
+        <form
+          noValidate
+          onSubmit={(e) => {
+            e.preventDefault();
+            void form.handleSubmit();
+          }}
+          className="flex flex-col gap-5"
+        >
+          {/* === Client === */}
+          <form.Field
+            name="clientName"
+            validators={{ onChange: validators.clientName }}
+          >
+            {(field) => (
+              <form.Field name="clientId">
+                {(idField) => (
+                  <Field
+                    label="Client"
+                    htmlFor={field.name}
+                    hint="Tapez pour rechercher un client existant ou en créer un."
+                    error={firstError(field.state.meta.errors)}
+                  >
+                    <ClientCombobox
+                      id={field.name}
+                      value={field.state.value}
+                      selectedClientId={idField.state.value}
+                      onChange={({ value, clientId }) => {
+                        field.handleChange(value);
+                        idField.handleChange(clientId);
+                      }}
+                    />
+                  </Field>
+                )}
+              </form.Field>
+            )}
+          </form.Field>
+
+          {/* === N° + Date d'émission === */}
+          <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
+            <form.Field
+              name="numero"
+              validators={{ onChange: validators.numero }}
+            >
+              {(field) => (
+                <Field
+                  label="N° de facture"
+                  htmlFor={field.name}
+                  error={firstError(field.state.meta.errors)}
+                >
+                  <Input
+                    id={field.name}
+                    placeholder="F-2026-0043"
+                    value={field.state.value}
+                    onChange={(e) => field.handleChange(e.target.value)}
+                  />
+                </Field>
+              )}
+            </form.Field>
+
+            <form.Field name="issueDate">
+              {(field) => (
+                <Field label="Date d'émission" htmlFor={field.name}>
+                  <Input
+                    id={field.name}
+                    type="date"
+                    value={field.state.value.slice(0, 10)}
+                    onChange={(e) => {
+                      const d = new Date(e.target.value);
+                      field.handleChange(d.toISOString());
+                    }}
+                  />
+                </Field>
+              )}
+            </form.Field>
+          </div>
+
+          {/* === Montant + Échéance relative === */}
+          <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
+            <form.Field
+              name="amountTtcCents"
+              validators={{ onChange: validators.amountTtcCents }}
+            >
+              {(field) => (
+                <Field
+                  label="Montant TTC"
+                  htmlFor={field.name}
+                  hint="Montant en euros (ex: 1240 ou 1240.50)."
+                  error={firstError(field.state.meta.errors)}
+                >
+                  {/* Input non-contrôlé (defaultValue) pour ne pas reformatter
+                      à chaque frappe — sinon "1.00" écrase "10000" et l'user
+                      ne peut pas taper de gros montants. La form state reçoit
+                      les centimes via onChange. Re-monté à chaque ouverture
+                      du Dialog (DialogContent unmounted on close), donc
+                      defaultValue est ré-évalué à chaque réouverture. */}
+                  <Input
+                    id={field.name}
+                    type="number"
+                    inputMode="decimal"
+                    step="any"
+                    min={0}
+                    placeholder="0,00"
+                    defaultValue={
+                      field.state.value === 0
+                        ? ""
+                        : (field.state.value / 100).toString()
+                    }
+                    onChange={(e) => {
+                      const raw = e.target.value.replace(",", ".");
+                      const val = parseFloat(raw);
+                      field.handleChange(
+                        Number.isNaN(val) ? 0 : Math.round(val * 100),
+                      );
+                    }}
+                  />
+                </Field>
+              )}
+            </form.Field>
+
+            <form.Field name="relativeDueDays">
+              {(field) => (
+                <Field label="Échéance" htmlFor={field.name}>
+                  <Select
+                    value={field.state.value}
+                    onValueChange={(v) =>
+                      field.handleChange(v as RelativeDueDays)
+                    }
+                  >
+                    <SelectTrigger id={field.name}>
+                      <SelectValue />
+                    </SelectTrigger>
+                    <SelectContent>
+                      {RELATIVE_DUE_OPTIONS.map((opt) => (
+                        <SelectItem key={opt} value={opt}>
+                          {RELATIVE_DUE_LABELS[opt]}
+                        </SelectItem>
+                      ))}
+                    </SelectContent>
+                  </Select>
+                </Field>
+              )}
+            </form.Field>
+          </div>
+
+          {/* === Plan === */}
+          <form.Field
+            name="planId"
+            validators={{ onChange: validators.planId }}
+          >
+            {(field) => (
+              <Field
+                label="Plan de relance"
+                htmlFor={field.name}
+                error={firstError(field.state.meta.errors)}
+              >
+                <Select
+                  value={field.state.value}
+                  onValueChange={(v) => field.handleChange(v)}
+                >
+                  <SelectTrigger id={field.name}>
+                    <SelectValue placeholder="Choisir un plan…" />
+                  </SelectTrigger>
+                  <SelectContent>
+                    {plans.map((plan) => (
+                      <SelectItem key={plan.id} value={plan.id}>
+                        {plan.name}
+                      </SelectItem>
+                    ))}
+                  </SelectContent>
+                </Select>
+              </Field>
+            )}
+          </form.Field>
+
+          <DialogFooter>
+            <Button
+              variant="ghost"
+              size="sm"
+              type="button"
+              disabled
+              className="sm:mr-auto"
+            >
+              <Paperclip size={14} aria-hidden="true" /> Joindre le PDF
+              <span className="ml-1 text-[11px] italic text-ink-3">(bientôt)</span>
+            </Button>
+            <DialogClose asChild>
+              <Button variant="secondary" size="sm" type="button">
+                Annuler
+              </Button>
+            </DialogClose>
+            <Button
+              size="sm"
+              type="submit"
+              loading={createMutation.isPending}
+            >
+              Créer la facture
+            </Button>
+          </DialogFooter>
+        </form>
+      </DialogContent>
+    </Dialog>
+  );
+}
+
+/**
+ * Petit helper pour extraire le 1er message d'erreur sans dépendre de la
+ * shape exacte du retour TanStack Form (qui peut être Issue[] ou string[]
+ * selon la version).
+ */
+function firstError(errors: unknown[]): string | undefined {
+  const first = errors[0];
+  if (!first) return undefined;
+  if (typeof first === "string") return first;
+  if (typeof first === "object" && first !== null && "message" in first) {
+    const msg = (first as { message?: unknown }).message;
+    if (typeof msg === "string") return msg;
+  }
+  return undefined;
+}
+
+function todayISO(): string {
+  const d = new Date();
+  d.setHours(9, 0, 0, 0);
+  return d.toISOString();
+}
diff --git a/apps/web/src/components/layout/AppLayout.tsx b/apps/web/src/components/layout/AppLayout.tsx
index 1dac995..660ba15 100644
--- a/apps/web/src/components/layout/AppLayout.tsx
+++ b/apps/web/src/components/layout/AppLayout.tsx
@@ -8,6 +8,10 @@ import { AppSidebar } from "./AppSidebar";
 import { AppTopbar } from "./AppTopbar";
 import { MobileTabBar } from "./MobileTabBar";
 import { Link } from "@tanstack/react-router";
+import {
+  ManualInvoiceProvider,
+  useManualInvoice,
+} from "@/hooks/useManualInvoiceDialog";
 
 /**
  * Shell de l'app authentifiée :
@@ -40,6 +44,18 @@ type DashboardKpis = {
 };
 
 export function AppLayout({ children, title, subtitle, actions }: AppLayoutProps) {
+  return (
+    <ManualInvoiceProvider>
+      <AppLayoutInner title={title} subtitle={subtitle} actions={actions}>
+        {children}
+      </AppLayoutInner>
+    </ManualInvoiceProvider>
+  );
+}
+
+function AppLayoutInner({ children, title, subtitle, actions }: AppLayoutProps) {
+  const manual = useManualInvoice();
+
   // KPIs partagés layout ↔ dashboard : on les charge ici pour que le sidebar
   // affiche le compteur sans attendre le rendu du dashboard.
   const { data: kpis } = useQuery({
@@ -52,7 +68,7 @@ export function AppLayout({ children, title, subtitle, actions }: AppLayoutProps
   // chaque route gère ses propres CTA en tête de contenu (cf. wireframe 4.3).
   const defaultActions = (
     <div className="hidden lg:flex items-center gap-2">
-      <Button size="sm" variant="secondary" disabled>
+      <Button size="sm" variant="secondary" onClick={manual.open}>
         <Plus size={14} aria-hidden="true" /> Saisir
       </Button>
       <Button size="sm" asChild>
diff --git a/apps/web/src/components/ui/Dialog.tsx b/apps/web/src/components/ui/Dialog.tsx
new file mode 100644
index 0000000..e9f88b1
--- /dev/null
+++ b/apps/web/src/components/ui/Dialog.tsx
@@ -0,0 +1,131 @@
+import { forwardRef } from "react";
+import * as DialogPrimitive from "@radix-ui/react-dialog";
+import { X } from "lucide-react";
+import { cn } from "@/lib/utils";
+
+/**
+ * Dialog stylé maison à partir des primitives Radix.
+ *
+ * Personnalité :
+ *  - Backdrop : ink-2 à 35% d'opacité avec blur léger (pas un noir pur 50%)
+ *  - Content : bg-cream (pas blanc pur), border-line, rounded-card, shadow-card
+ *  - Anim : fade + zoom léger en open (pas de slide agressif)
+ *  - Close button : croix discrète en haut-droite, hover bg-cream-2
+ */
+export const Dialog = DialogPrimitive.Root;
+export const DialogTrigger = DialogPrimitive.Trigger;
+export const DialogPortal = DialogPrimitive.Portal;
+export const DialogClose = DialogPrimitive.Close;
+
+export const DialogOverlay = forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Overlay>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Overlay>
+>(({ className, ...props }, ref) => (
+  <DialogPrimitive.Overlay
+    ref={ref}
+    className={cn(
+      "fixed inset-0 z-50 bg-ink/35 backdrop-blur-[2px]",
+      "data-[state=open]:animate-in data-[state=open]:fade-in-0",
+      "data-[state=closed]:animate-out data-[state=closed]:fade-out-0",
+      className,
+    )}
+    {...props}
+  />
+));
+DialogOverlay.displayName = DialogPrimitive.Overlay.displayName;
+
+export const DialogContent = forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Content>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Content> & {
+    /** Largeur max. Default 540px (cf. wireframe 2.3). */
+    maxWidth?: number;
+  }
+>(({ className, children, maxWidth = 540, ...props }, ref) => (
+  <DialogPortal>
+    <DialogOverlay />
+    <DialogPrimitive.Content
+      ref={ref}
+      style={{ maxWidth: `${maxWidth}px` }}
+      className={cn(
+        "fixed left-1/2 top-1/2 z-50 w-[calc(100vw-2rem)] -translate-x-1/2 -translate-y-1/2",
+        "rounded-card border border-line bg-cream shadow-card",
+        "p-6 sm:p-7 max-h-[90vh] overflow-y-auto",
+        "data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95",
+        "data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95",
+        className,
+      )}
+      {...props}
+    >
+      {children}
+      <DialogPrimitive.Close
+        className={cn(
+          "absolute right-4 top-4 inline-flex size-7 items-center justify-center",
+          "rounded-default text-ink-3 hover:bg-cream-2 hover:text-ink",
+          "transition-colors focus-visible:outline-none focus-visible:ring-4 focus-visible:ring-rubis-glow",
+        )}
+        aria-label="Fermer"
+      >
+        <X size={15} aria-hidden="true" />
+      </DialogPrimitive.Close>
+    </DialogPrimitive.Content>
+  </DialogPortal>
+));
+DialogContent.displayName = DialogPrimitive.Content.displayName;
+
+export function DialogHeader({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) {
+  return (
+    <div
+      className={cn(
+        "flex flex-col gap-1 pb-4 border-b border-line mb-5",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
+
+export const DialogTitle = forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Title>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Title>
+>(({ className, ...props }, ref) => (
+  <DialogPrimitive.Title
+    ref={ref}
+    className={cn(
+      "font-display text-[19px] font-semibold tracking-[-0.018em] text-ink",
+      className,
+    )}
+    {...props}
+  />
+));
+DialogTitle.displayName = DialogPrimitive.Title.displayName;
+
+export const DialogDescription = forwardRef<
+  React.ElementRef<typeof DialogPrimitive.Description>,
+  React.ComponentPropsWithoutRef<typeof DialogPrimitive.Description>
+>(({ className, ...props }, ref) => (
+  <DialogPrimitive.Description
+    ref={ref}
+    className={cn("text-[13px] text-ink-3 leading-relaxed", className)}
+    {...props}
+  />
+));
+DialogDescription.displayName = DialogPrimitive.Description.displayName;
+
+export function DialogFooter({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) {
+  return (
+    <div
+      className={cn(
+        "flex flex-col-reverse gap-2 pt-5 border-t border-line mt-6",
+        "sm:flex-row sm:items-center sm:justify-end",
+        className,
+      )}
+      {...props}
+    />
+  );
+}
diff --git a/apps/web/src/hooks/useManualInvoiceDialog.tsx b/apps/web/src/hooks/useManualInvoiceDialog.tsx
new file mode 100644
index 0000000..19fafb8
--- /dev/null
+++ b/apps/web/src/hooks/useManualInvoiceDialog.tsx
@@ -0,0 +1,48 @@
+import { createContext, useContext, useState, type ReactNode } from "react";
+
+import { ManualInvoiceDialog } from "@/components/factures/ManualInvoiceDialog";
+
+/**
+ * Provider + hook pour piloter la modale "Saisie manuelle" depuis n'importe
+ * où dans l'app authentifiée. Évite de plumber un onClick à travers les
+ * couches de layout, et garde une seule instance de la modale rendue à la
+ * racine (= un seul réseau de portals Radix).
+ *
+ * Usage :
+ *   <ManualInvoiceProvider>
+ *     <App />          // ← le bouton "+ Saisir" appelle useManualInvoice()
+ *   </ManualInvoiceProvider>
+ */
+type Ctx = {
+  open: () => void;
+  close: () => void;
+  isOpen: boolean;
+};
+
+const ManualInvoiceContext = createContext<Ctx | null>(null);
+
+export function ManualInvoiceProvider({ children }: { children: ReactNode }) {
+  const [isOpen, setIsOpen] = useState(false);
+  return (
+    <ManualInvoiceContext.Provider
+      value={{
+        isOpen,
+        open: () => setIsOpen(true),
+        close: () => setIsOpen(false),
+      }}
+    >
+      {children}
+      <ManualInvoiceDialog open={isOpen} onOpenChange={setIsOpen} />
+    </ManualInvoiceContext.Provider>
+  );
+}
+
+export function useManualInvoice(): Ctx {
+  const ctx = useContext(ManualInvoiceContext);
+  if (!ctx) {
+    throw new Error(
+      "useManualInvoice doit être utilisé dans un <ManualInvoiceProvider>",
+    );
+  }
+  return ctx;
+}
diff --git a/apps/web/src/mocks/handlers/invoices.ts b/apps/web/src/mocks/handlers/invoices.ts
index a9bb85e..8c05c94 100644
--- a/apps/web/src/mocks/handlers/invoices.ts
+++ b/apps/web/src/mocks/handlers/invoices.ts
@@ -115,6 +115,17 @@ const draftFieldsSchema = z.object({
   planId: z.string().nullable(),
 });
 
+const createInvoiceManualSchema = z.object({
+  clientId: z.string().optional(),
+  clientName: z.string().min(2).max(120),
+  clientEmail: z.string().email().nullable().optional(),
+  numero: z.string().min(1).max(50),
+  amountTtcCents: z.number().int().positive(),
+  issueDate: z.string().datetime(),
+  dueDate: z.string().datetime(),
+  planId: z.string().nullable().optional(),
+});
+
 /**
  * Construit la timeline d'une facture en composant les étapes du plan
  * avec l'état courant. Très simplifié pour V1 :
@@ -295,6 +306,83 @@ export const invoiceHandlers = [
     });
   }),
 
+  // GET /api/v1/clients — autocomplete dans la saisie manuelle
+  http.get(`${apiBase}/clients`, ({ request }) => {
+    const orgId = authedOrgId(request.headers.get("authorization"));
+    if (!orgId) return unauthenticated();
+    return HttpResponse.json({ data: mockDb.listClientsForOrg(orgId) });
+  }),
+
+  // POST /api/v1/invoices — saisie manuelle (cf. wireframe 2.3)
+  http.post(`${apiBase}/invoices`, async ({ request }) => {
+    const orgId = authedOrgId(request.headers.get("authorization"));
+    if (!orgId) return unauthenticated();
+
+    const json = await request.json();
+    const parsed = createInvoiceManualSchema.safeParse(json);
+    if (!parsed.success) {
+      return HttpResponse.json(
+        {
+          errors: parsed.error.issues.map((i) => ({
+            code: "validation_failed",
+            message: i.message,
+            field: i.path.join("."),
+          })),
+        },
+        { status: 422 },
+      );
+    }
+    const fields = parsed.data;
+
+    // Résolution client : si clientId fourni → utilise. Sinon match par nom
+    // (case-insensitive). Sinon crée un nouveau client à la volée.
+    let clientId = fields.clientId;
+    let clientName = fields.clientName;
+    if (!clientId) {
+      const existing = mockDb
+        .listClientsForOrg(orgId)
+        .find(
+          (c) => c.name.toLowerCase() === fields.clientName.toLowerCase(),
+        );
+      if (existing) {
+        clientId = existing.id;
+        clientName = existing.name;
+      } else {
+        const created = mockDb.createClient(orgId, {
+          name: fields.clientName,
+          email: fields.clientEmail ?? null,
+          phone: null,
+          address: null,
+          notes: null,
+        });
+        clientId = created.id;
+        clientName = created.name;
+      }
+    } else {
+      const c = mockDb.findClientById(orgId, clientId);
+      if (c) clientName = c.name;
+    }
+
+    const plan = fields.planId ? mockDb.findPlanById(orgId, fields.planId) : null;
+
+    const invoice = mockDb.createInvoice(orgId, {
+      clientId: clientId!,
+      clientName,
+      numero: fields.numero,
+      amountTtcCents: fields.amountTtcCents,
+      issueDate: fields.issueDate,
+      dueDate: fields.dueDate,
+      status: "pending",
+      planId: plan?.id ?? null,
+      planName: plan?.name ?? null,
+      pdfStorageKey: null,
+      notes: null,
+      rubisEarned: 1, // bonus saisie
+    });
+
+    return HttpResponse.json({ data: invoice }, { status: 201 });
+  }),
+
   // POST /api/v1/invoices/upload — démarre un batch OCR
   http.post(`${apiBase}/invoices/upload`, async ({ request }) => {
     const orgId = authedOrgId(request.headers.get("authorization"));
diff --git a/apps/web/src/routes/_app/factures.tsx b/apps/web/src/routes/_app/factures.tsx
index bcb41ed..7b9a4c8 100644
--- a/apps/web/src/routes/_app/factures.tsx
+++ b/apps/web/src/routes/_app/factures.tsx
@@ -17,6 +17,7 @@ import {
   type InvoiceListItem,
 } from "@/components/factures/InvoiceTable";
 import { InvoiceCardList } from "@/components/factures/InvoiceCardList";
+import { useManualInvoice } from "@/hooks/useManualInvoiceDialog";
 
 type ImportBatchResponse = {
   id: string;
@@ -88,6 +89,7 @@ function FacturesPage() {
   const navigate = useNavigate();
   const search = Route.useSearch();
   const upload = useUploadInvoices();
+  const manual = useManualInvoice();
 
   // Drop-catcher global au niveau de la route : si l'utilisateur lâche un
   // fichier hors de la dropzone (ailleurs sur /factures), on intercepte
@@ -138,6 +140,7 @@ function FacturesPage() {
         <FacturesEmpty
           onFiles={(files) => upload.mutate(files)}
           isUploading={upload.isPending}
+          onManualEntry={manual.open}
         />
       </div>
     );
@@ -220,9 +223,11 @@ function FacturesPage() {
 function FacturesEmpty({
   onFiles,
   isUploading,
+  onManualEntry,
 }: {
   onFiles: (files: File[]) => void;
   isUploading: boolean;
+  onManualEntry: () => void;
 }) {
   return (
     <div className="flex flex-col gap-5">
@@ -235,7 +240,12 @@ function FacturesEmpty({
           en 30 secondes.
         </p>
       </div>
-      <Dropzone variant="full" onFiles={onFiles} isUploading={isUploading} />
+      <Dropzone
+        variant="full"
+        onFiles={onFiles}
+        isUploading={isUploading}
+        onManualEntry={onManualEntry}
+      />
     </div>
   );
 }
diff --git a/apps/web/src/routes/_app/factures_.import.tsx b/apps/web/src/routes/_app/factures_.import.tsx
index 59208b0..a4ab672 100644
--- a/apps/web/src/routes/_app/factures_.import.tsx
+++ b/apps/web/src/routes/_app/factures_.import.tsx
@@ -7,6 +7,7 @@ import { api } from "@/lib/api";
 import { Button } from "@/components/ui/Button";
 import { Eyebrow } from "@/components/ui/Eyebrow";
 import { Dropzone } from "@/components/factures/Dropzone";
+import { useManualInvoice } from "@/hooks/useManualInvoiceDialog";
 
 type ImportBatchResponse = {
   id: string;
@@ -19,6 +20,7 @@ export const Route = createFileRoute("/_app/factures_/import")({
 
 function ImportLandingPage() {
   const navigate = useNavigate();
+  const manual = useManualInvoice();
 
   const upload = useMutation({
     mutationFn: (files: File[]) =>
@@ -80,9 +82,8 @@ function ImportLandingPage() {
           </p>
         </div>
 
-        <Button variant="ghost" size="sm" disabled>
+        <Button variant="ghost" size="sm" onClick={manual.open}>
           <FilePlus size={14} aria-hidden="true" /> Saisir manuellement
-          <span className="ml-1 text-[11px] italic text-ink-3">(bientôt)</span>
         </Button>
       </header>
 
@@ -90,6 +91,7 @@ function ImportLandingPage() {
         variant="full"
         onFiles={(files) => upload.mutate(files)}
         isUploading={upload.isPending}
+        onManualEntry={manual.open}
       />
 
       {/* Aide / rappel des règles d'OCR — discret en bas */}