diff --git a/backend/src/lib/password-variants.ts b/backend/src/lib/password-variants.ts
new file mode 100644
index 0000000..b62d932
--- /dev/null
+++ b/backend/src/lib/password-variants.ts
@@ -0,0 +1,25 @@
+// Les claviers de téléphone remplacent ' par ’ et ajoutent parfois une espace après le dernier mot.
+// Un mot de passe de partage tapé ainsi doit quand même ouvrir l'arbre : on essaie aussi ces variantes.
+const CURLY_APOSTROPHES = /[‘’ʼ´`]/g
+const CURLY_QUOTES = /[“”«»]/g
+
+export function sharePasswordVariants(input: string): string[] {
+  const trimmed = input.trim()
+  const straight = trimmed.replace(CURLY_APOSTROPHES, "'").replace(CURLY_QUOTES, '"')
+  const curly = trimmed.replace(/'/g, '’')
+  return [...new Set([input, trimmed, straight, curly])].filter(Boolean)
+}
+
+// Renvoie la variante qui correspond à l'un des hash, ou null
+export async function matchSharePassword(
+  input: string,
+  hashes: string[],
+  verify: (password: string, hash: string) => Promise<boolean>,
+): Promise<string | null> {
+  for (const candidate of sharePasswordVariants(input)) {
+    for (const hash of hashes) {
+      if (await verify(candidate, hash)) return candidate
+    }
+  }
+  return null
+}
diff --git a/backend/src/routes/trees.ts b/backend/src/routes/trees.ts
index 07c7e18..fd3715e 100644
--- a/backend/src/routes/trees.ts
+++ b/backend/src/routes/trees.ts
@@ -4,6 +4,7 @@ import { z } from 'zod'
 
 import { env } from '../config/env.js'
 import { hashPassword, verifyPassword } from '../lib/auth.js'
+import { matchSharePassword } from '../lib/password-variants.js'
 import { decryptSharePassword, encryptSharePassword } from '../lib/share-password.js'
 import { purgeTrees } from '../lib/tree-purge.js'
 import type { MembershipRole } from '../types/auth.js'
@@ -695,9 +696,12 @@ export const treeRoutes: FastifyPluginAsync = async (app) => {
 
       // Un seul mot de passe de partage (25/09/2026) : regarder et proposer. Les deux colonnes restent,
       // les arbres créés avant ont encore deux mots de passe différents, les deux ouvrent en contributeur.
-      const matches =
-        (await verifyPassword(payload.data.password, accessConfig.contributorHash)) ||
-        (await verifyPassword(payload.data.password, accessConfig.visitorHash))
+      // Apostrophe typographique ou espace finale ajoutées par un clavier de téléphone : acceptées (password-variants.ts)
+      const matches = await matchSharePassword(
+        payload.data.password,
+        [accessConfig.contributorHash, accessConfig.visitorHash],
+        verifyPassword,
+      )
 
       if (!matches) {
         return reply.code(401).send({ error: 'invalid_password' })
@@ -895,11 +899,13 @@ export const treeRoutes: FastifyPluginAsync = async (app) => {
       return reply.code(404).send({ error: 'tree_not_found' })
     }
 
-    const password = payload.data.password.trim()
-    const matches =
-      (await verifyPassword(password, accessConfig.contributorHash)) ||
-      (await verifyPassword(password, accessConfig.visitorHash))
-    if (!matches) {
+    // On garde la variante exacte qui correspond au hash, c'est elle que la famille doit recevoir
+    const password = await matchSharePassword(
+      payload.data.password,
+      [accessConfig.contributorHash, accessConfig.visitorHash],
+      verifyPassword,
+    )
+    if (!password) {
       return reply.code(422).send({ error: 'password_mismatch' })
     }
 
diff --git a/backend/test/api-security.integration.test.ts b/backend/test/api-security.integration.test.ts
index 84af498..7ff044c 100644
--- a/backend/test/api-security.integration.test.ts
+++ b/backend/test/api-security.integration.test.ts
@@ -605,6 +605,38 @@ describe('API security and authz', () => {
     await app.close()
   })
 
+  it('accepts the share password typed with a phone apostrophe and a trailing space', async () => {
+    const { hashPassword } = await import('../src/lib/auth')
+    const app = createApp()
+    await app.ready()
+
+    const hash = await hashPassword("Lavenuedel'Avenir")
+    prismaMock.treeAccessPasswords.findUnique.mockResolvedValue({
+      treeId: 'tree-1',
+      visitorHash: hash,
+      contributorHash: hash,
+      updatedAt: new Date('2026-02-11T10:00:00.000Z'),
+      tree: { deletedAt: null },
+    })
+
+    for (const typed of ['Lavenuedel’Avenir', "Lavenuedel'Avenir ", 'Lavenuedel’Avenir ']) {
+      const response = await app.inject({
+        method: 'POST',
+        url: '/trees/tree-1/access/unlock',
+        payload: { password: typed },
+      })
+      expect(response.statusCode, JSON.stringify(typed)).toBe(200)
+    }
+
+    const wrong = await app.inject({
+      method: 'POST',
+      url: '/trees/tree-1/access/unlock',
+      payload: { password: 'lavenuedel’avenir' },
+    })
+    expect(wrong.statusCode).toBe(401)
+    await app.close()
+  })
+
   it('still rejects a wrong share password', async () => {
     const { hashPassword } = await import('../src/lib/auth')
     const app = createApp()
diff --git a/backend/test/password-variants.test.ts b/backend/test/password-variants.test.ts
new file mode 100644
index 0000000..377a148
--- /dev/null
+++ b/backend/test/password-variants.test.ts
@@ -0,0 +1,18 @@
+import { describe, expect, it } from 'vitest'
+
+import { sharePasswordVariants } from '../src/lib/password-variants'
+
+describe('sharePasswordVariants', () => {
+  it('ajoute la forme droite et la forme typographique de l\'apostrophe', () => {
+    expect(sharePasswordVariants('Lavenuedel’Avenir')).toContain("Lavenuedel'Avenir")
+    expect(sharePasswordVariants("Lavenuedel'Avenir")).toContain('Lavenuedel’Avenir')
+  })
+
+  it('retire les espaces autour sans toucher à la casse', () => {
+    expect(sharePasswordVariants('  Soleil ')).toEqual(['  Soleil ', 'Soleil'])
+  })
+
+  it('ne change rien à un mot de passe simple', () => {
+    expect(sharePasswordVariants('123soleil')).toEqual(['123soleil'])
+  })
+})