diff --git a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/2ivbc5b4um5bu.json b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/2ivbc5b4um5bu.json
index a18abb2..4fd2b35 100644
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/2ivbc5b4um5bu.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/2ivbc5b4um5bu.json
@@ -1,5 +1,5 @@
 {
-  "cid": "",
+  "cid": "bafyreif2bskzqjjmwior5qmbfeivv4z6nb2qrtio6a2jnmy2z5b4hosrse",
   "uri": "at://did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/2ivbc5b4um5bu",
   "value": {
     "$type": "ai.syui.log.chat",
diff --git a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/bj3kxqtnko4gx.json b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/bj3kxqtnko4gx.json
index ab13e56..e0e4a07 100644
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/bj3kxqtnko4gx.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/bj3kxqtnko4gx.json
@@ -1,5 +1,5 @@
 {
-  "cid": "",
+  "cid": "bafyreieh4i5og6kxeq64wsteijjg3gzixckbct524kqegg22jw3wa7m2d4",
   "uri": "at://did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/bj3kxqtnko4gx",
   "value": {
     "$type": "ai.syui.log.chat",
diff --git a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/ia5uwsydi5ljs.json b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/ia5uwsydi5ljs.json
index d528b46..a5d4b92 100644
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/ia5uwsydi5ljs.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/ia5uwsydi5ljs.json
@@ -1,5 +1,5 @@
 {
-  "cid": "",
+  "cid": "bafyreid6x7xc6n4ji6hda5nl7z2assuc42mtzoom6x5makugpg4im5pp2u",
   "uri": "at://did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/ia5uwsydi5ljs",
   "value": {
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diff --git a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/index.json b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/index.json
index 69ae2b4..ab19381 100644
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/index.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/index.json
@@ -16,15 +16,18 @@
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   "krajt6fldd762",
   "kr5ig7vlgl276",
+  "k7bhaaskcuw2j",
   "jtdn5ncfojjwv",
   "jbfvt32lao6yg",
   "ixeuckd6ao43h",
   "inwkl55s7osg3",
+  "ia5uwsydi5ljs",
   "evknoqtr7uyey",
   "efs4j6j3zqcbv",
   "d3dmreieiynnd",
   "caiun7er6rklv",
   "c5xux5rkjr3n7",
+  "bj3kxqtnko4gx",
   "bcdp3pivh6bw6",
   "amwpl3iupt6wn",
   "655zfmpn4ln3u",
@@ -33,8 +36,5 @@
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   "325sghcecgzco",
   "2ks46vomw4s2i",
-  "ia5uwsydi5ljs",
-  "bj3kxqtnko4gx",
-  "2ivbc5b4um5bu",
-  "k7bhaaskcuw2j"
+  "2ivbc5b4um5bu"
 ]
\ No newline at end of file
diff --git a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/k7bhaaskcuw2j.json b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/k7bhaaskcuw2j.json
index ae1d28f..f70fab4 100644
--- a/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/k7bhaaskcuw2j.json
+++ b/public/content/did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/k7bhaaskcuw2j.json
@@ -1,5 +1,5 @@
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+  "cid": "bafyreicq4zwrghepaogxkm44azvuppoh4m3yiwdea2hfdp2ugvabugyvsm",
   "uri": "at://did:plc:6qyecktefllvenje24fcxnie/ai.syui.log.chat/k7bhaaskcuw2j",
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/27xox352hir2g.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/27xox352hir2g.json
index 5f32f54..149977a 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/27xox352hir2g.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/27xox352hir2g.json
@@ -1,5 +1,5 @@
 {
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3gaf4ckp5be5j.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3gaf4ckp5be5j.json
index 87c8a10..0539a8b 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3gaf4ckp5be5j.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3gaf4ckp5be5j.json
@@ -1,5 +1,5 @@
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3kwayvs5zrtng.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3kwayvs5zrtng.json
index 93f1486..8272544 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3kwayvs5zrtng.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3kwayvs5zrtng.json
@@ -1,5 +1,5 @@
 {
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   "uri": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3kwayvs5zrtng",
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3ucggdsyhth6h.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3ucggdsyhth6h.json
index 5ecca89..f77a28c 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3ucggdsyhth6h.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3ucggdsyhth6h.json
@@ -1,5 +1,5 @@
 {
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   "uri": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/3ucggdsyhth6h",
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/6eg45a33vqzp3.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/6eg45a33vqzp3.json
index 223d9cd..a8b5627 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/6eg45a33vqzp3.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/6eg45a33vqzp3.json
@@ -1,5 +1,5 @@
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/74zyr4w2s3vf4.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/74zyr4w2s3vf4.json
index 5a7852d..75174f6 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/74zyr4w2s3vf4.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/74zyr4w2s3vf4.json
@@ -1,5 +1,5 @@
 {
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   "uri": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/74zyr4w2s3vf4",
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/a6hfn4arclf3k.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/a6hfn4arclf3k.json
index 77daf63..3363e9e 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/a6hfn4arclf3k.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/a6hfn4arclf3k.json
@@ -1,5 +1,5 @@
 {
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/b7emi5uv7frxu.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/b7emi5uv7frxu.json
index ea2feea..2c22651 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/b7emi5uv7frxu.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/b7emi5uv7frxu.json
@@ -1,5 +1,5 @@
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/buzwfx2jasgos.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/buzwfx2jasgos.json
index dea58a3..caf1d0f 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/buzwfx2jasgos.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/buzwfx2jasgos.json
@@ -1,5 +1,5 @@
 {
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/bvm7emi5zgatx.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/bvm7emi5zgatx.json
index 3dc1442..2c754d4 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/bvm7emi5zgatx.json
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@@ -1,5 +1,5 @@
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/coztphfo4rtbx.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/coztphfo4rtbx.json
index 3626740..3c95732 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/coztphfo4rtbx.json
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index 29a8089..b7a0acc 100644
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index a818099..a8f3b5e 100644
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index 0fa2a99..05d3fd3 100644
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diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/index.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/index.json
index 2954210..87ca58a 100644
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+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/index.json
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   "value": {
     "$type": "ai.syui.log.chat",
diff --git a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/zi7t34bdc6kqn.json b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/zi7t34bdc6kqn.json
index 54b5e47..ba524c1 100644
--- a/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/zi7t34bdc6kqn.json
+++ b/public/content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/zi7t34bdc6kqn.json
@@ -1,5 +1,5 @@
 {
-  "cid": "",
+  "cid": "bafyreid7nbomq5qnza2kqkfv3sha4wqjh4lr4cwusuqdh2y57jpza6triu",
   "uri": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.chat/zi7t34bdc6kqn",
   "value": {
     "$type": "ai.syui.log.chat",
diff --git a/src/web/components/chat.ts b/src/web/components/chat.ts
index 8157b72..bab0d2d 100644
--- a/src/web/components/chat.ts
+++ b/src/web/components/chat.ts
@@ -171,7 +171,8 @@ export function renderChatThread(
   userProfile?: Profile | null,
   botProfile?: Profile | null,
   pds?: string,
-  chatCollection: string = 'ai.syui.log.chat'
+  chatCollection: string = 'ai.syui.log.chat',
+  loggedInDid?: string | null
 ): string {
   // Find root message
   const rootUri = `at://${userDid}/${chatCollection}/${rootRkey}`
@@ -223,6 +224,8 @@ export function renderChatThread(
     const displayContent = getTranslatedContent(msg)
     const content = renderMarkdown(displayContent)
     const recordLink = `/@${author.handle}/at/collection/${chatCollection}/${rkey}`
+    const canEdit = loggedInDid && authorDid === loggedInDid
+    const editLink = `/@${userHandle}/at/chat/${rkey}/edit`
 
     return `
       <article class="chat-message">
@@ -233,6 +236,7 @@ export function renderChatThread(
           <div class="chat-message-header">
             <a href="/@${author.handle}" class="chat-author">@${escapeHtml(author.handle)}</a>
             <a href="${recordLink}" class="chat-time">${time}</a>
+            ${canEdit ? `<a href="${editLink}" class="chat-edit-btn">edit</a>` : ''}
           </div>
           <div class="chat-content">${content}</div>
         </div>
@@ -269,8 +273,41 @@ export function renderChatThreadPage(
   userProfile?: Profile | null,
   botProfile?: Profile | null,
   pds?: string,
-  chatCollection: string = 'ai.syui.log.chat'
+  chatCollection: string = 'ai.syui.log.chat',
+  loggedInDid?: string | null
 ): string {
-  const thread = renderChatThread(messages, rootRkey, userDid, userHandle, botDid, botHandle, userProfile, botProfile, pds, chatCollection)
+  const thread = renderChatThread(messages, rootRkey, userDid, userHandle, botDid, botHandle, userProfile, botProfile, pds, chatCollection, loggedInDid)
   return `<div class="chat-container">${thread}</div>`
 }
+
+// Render chat edit form
+export function renderChatEditForm(
+  message: ChatMessage,
+  collection: string,
+  userHandle: string
+): string {
+  const rkey = message.uri.split('/').pop() || ''
+  const content = message.value.content
+
+  return `
+    <div class="chat-edit-container">
+      <h2>Edit Chat Message</h2>
+      <form class="chat-edit-form" id="chat-edit-form">
+        <textarea
+          class="chat-edit-content"
+          id="chat-edit-content"
+          rows="10"
+          required
+        >${escapeHtml(content)}</textarea>
+        <div class="chat-edit-footer">
+          <span class="chat-edit-collection">${collection}</span>
+          <div class="chat-edit-buttons">
+            <a href="/@${userHandle}/at/chat/${rkey}" class="chat-edit-cancel">Cancel</a>
+            <button type="submit" class="chat-edit-save" id="chat-edit-save" data-rkey="${rkey}">Save</button>
+          </div>
+        </div>
+      </form>
+      <div id="chat-edit-status" class="chat-edit-status"></div>
+    </div>
+  `
+}
diff --git a/src/web/lib/auth.ts b/src/web/lib/auth.ts
index 9bf2cf0..f1be2d8 100644
--- a/src/web/lib/auth.ts
+++ b/src/web/lib/auth.ts
@@ -254,8 +254,8 @@ export async function updatePost(
 
   try {
     // Fetch existing record to preserve translations
-    let existingTranslations = undefined
-    let existingCreatedAt = new Date().toISOString()
+    let existingTranslations: unknown = undefined
+    let existingCreatedAt: unknown = new Date().toISOString()
     try {
       const existing = await agent.com.atproto.repo.getRecord({
         repo: agent.assertDid,
@@ -266,7 +266,7 @@ export async function updatePost(
         const value = existing.data.value as Record<string, unknown>
         existingTranslations = value.translations
         if (value.createdAt) {
-          existingCreatedAt = value.createdAt as string
+          existingCreatedAt = value.createdAt
         }
       }
     } catch {
@@ -298,6 +298,51 @@ export async function updatePost(
   }
 }
 
+// Update chat message
+export async function updateChat(
+  collection: string,
+  rkey: string,
+  content: string
+): Promise<{ uri: string; cid: string } | null> {
+  if (!agent) return null
+
+  try {
+    // Fetch existing record to preserve translations and other fields
+    let existingRecord: Record<string, unknown> = {}
+    try {
+      const existing = await agent.com.atproto.repo.getRecord({
+        repo: agent.assertDid,
+        collection,
+        rkey,
+      })
+      if (existing.data.value) {
+        existingRecord = existing.data.value as Record<string, unknown>
+      }
+    } catch {
+      // Record doesn't exist
+      throw new Error('Record not found')
+    }
+
+    const record: Record<string, unknown> = {
+      ...existingRecord,
+      $type: collection,
+      content,
+    }
+
+    const result = await agent.com.atproto.repo.putRecord({
+      repo: agent.assertDid,
+      collection,
+      rkey,
+      record,
+    })
+
+    return { uri: result.data.uri, cid: result.data.cid }
+  } catch (err) {
+    console.error('Update chat error:', err)
+    throw err
+  }
+}
+
 // Save migrated card data to ai.syui.card.old
 export async function saveMigratedCardData(
   user: {
diff --git a/src/web/lib/router.ts b/src/web/lib/router.ts
index c2d8fbe..2525a74 100644
--- a/src/web/lib/router.ts
+++ b/src/web/lib/router.ts
@@ -1,5 +1,5 @@
 export interface Route {
-  type: 'home' | 'user' | 'post' | 'postpage' | 'atbrowser' | 'service' | 'collection' | 'record' | 'chat' | 'chat-thread' | 'card' | 'card-old' | 'rse'
+  type: 'home' | 'user' | 'post' | 'postpage' | 'atbrowser' | 'service' | 'collection' | 'record' | 'chat' | 'chat-thread' | 'chat-edit' | 'card' | 'card-old' | 'rse'
   handle?: string
   rkey?: string
   service?: string
@@ -69,6 +69,12 @@ export function parseRoute(): Route {
     return { type: 'rse', handle: rseMatch[1] }
   }
 
+  // Chat edit: /@handle/at/chat/{rkey}/edit
+  const chatEditMatch = path.match(/^\/@([^/]+)\/at\/chat\/([^/]+)\/edit$/)
+  if (chatEditMatch) {
+    return { type: 'chat-edit', handle: chatEditMatch[1], rkey: chatEditMatch[2] }
+  }
+
   // Chat thread: /@handle/at/chat/{rkey}
   const chatThreadMatch = path.match(/^\/@([^/]+)\/at\/chat\/([^/]+)$/)
   if (chatThreadMatch) {
@@ -117,6 +123,8 @@ export function navigate(route: Route): void {
     path = `/@${route.handle}/at/chat`
   } else if (route.type === 'chat-thread' && route.handle && route.rkey) {
     path = `/@${route.handle}/at/chat/${route.rkey}`
+  } else if (route.type === 'chat-edit' && route.handle && route.rkey) {
+    path = `/@${route.handle}/at/chat/${route.rkey}/edit`
   }
 
   window.history.pushState({}, '', path)
diff --git a/src/web/main.ts b/src/web/main.ts
index 2ac2146..2471404 100644
--- a/src/web/main.ts
+++ b/src/web/main.ts
@@ -3,7 +3,7 @@ import './styles/card.css'
 import './styles/card-migrate.css'
 import { getConfig, resolveHandle, getProfile, getPosts, getPost, describeRepo, listRecords, getRecord, getPds, getNetworks, getChatMessages, getCards, getRse } from './lib/api'
 import { parseRoute, onRouteChange, navigate, type Route } from './lib/router'
-import { login, logout, handleCallback, restoreSession, isLoggedIn, getLoggedInHandle, getLoggedInDid, deleteRecord, updatePost } from './lib/auth'
+import { login, logout, handleCallback, restoreSession, isLoggedIn, getLoggedInHandle, getLoggedInDid, deleteRecord, updatePost, updateChat } from './lib/auth'
 import { validateRecord } from './lib/lexicon'
 import { renderHeader } from './components/header'
 import { renderProfile } from './components/profile'
@@ -12,7 +12,7 @@ import { renderPostForm, setupPostForm } from './components/postform'
 import { renderCollectionButtons, renderServerInfo, renderServiceList, renderCollectionList, renderRecordList, renderRecordDetail } from './components/browser'
 import { renderModeTabs, renderLangSelector, setupModeTabs } from './components/mode-tabs'
 import { renderFooter } from './components/footer'
-import { renderChatListPage, renderChatThreadPage } from './components/chat'
+import { renderChatListPage, renderChatThreadPage, renderChatEditForm } from './components/chat'
 import { renderCardPage } from './components/card'
 import { renderRsePage } from './components/rse'
 import { checkMigrationStatus, renderMigrationPage, setupMigrationButton } from './components/card-migrate'
@@ -168,7 +168,7 @@ async function render(route: Route): Promise<void> {
 
     // Mode tabs (Blog/Browser/Post/Chat/PDS)
     const activeTab = route.type === 'postpage' ? 'post' :
-      (route.type === 'chat' || route.type === 'chat-thread') ? 'chat' :
+      (route.type === 'chat' || route.type === 'chat-thread' || route.type === 'chat-edit') ? 'chat' :
       (route.type === 'atbrowser' || route.type === 'service' || route.type === 'collection' || route.type === 'record' ? 'browser' : 'blog')
     html += renderModeTabs(handle, activeTab, localOnly)
 
@@ -320,10 +320,35 @@ async function render(route: Route): Promise<void> {
       langList = Array.from(chatLangs)
 
       html += renderLangSelector(langList)
-      html += `<div id="content">${renderChatThreadPage(chatMessages, route.rkey, did, handle, botDid, botHandle, profile, botProfile, pds || undefined, chatCollection)}</div>`
+      html += `<div id="content">${renderChatThreadPage(chatMessages, route.rkey, did, handle, botDid, botHandle, profile, botProfile, pds || undefined, chatCollection, loggedInDid)}</div>`
       html += `<nav class="back-nav"><a href="/@${handle}/at/chat">chat</a></nav>`
       }
 
+    } else if (route.type === 'chat-edit' && route.rkey) {
+      // Chat edit page
+      if (!config.bot) {
+        html += `<div id="content" class="error">Bot not configured in config.json</div>`
+        html += `<nav class="back-nav"><a href="/@${handle}">${handle}</a></nav>`
+      } else if (!isOwner) {
+        html += `<div id="content" class="error">You can only edit your own messages</div>`
+        html += `<nav class="back-nav"><a href="/@${handle}/at/chat">chat</a></nav>`
+      } else {
+        const botDid = config.bot.did
+        const chatCollection = config.chatCollection || 'ai.syui.log.chat'
+
+        // Get the specific message
+        const chatMessages = await getChatMessages(did, botDid, chatCollection)
+        const targetUri = `at://${did}/${chatCollection}/${route.rkey}`
+        const message = chatMessages.find(m => m.uri === targetUri)
+
+        if (!message) {
+          html += `<div id="content" class="error">Message not found</div>`
+        } else {
+          html += `<div id="content">${renderChatEditForm(message, chatCollection, handle)}</div>`
+        }
+        html += `<nav class="back-nav"><a href="/@${handle}/at/chat">chat</a></nav>`
+      }
+
     } else {
       // User page: compact collection buttons + posts (use pre-loaded collections)
       html += `<div id="browser">${renderCollectionButtons(collections, handle)}</div>`
@@ -368,6 +393,12 @@ async function render(route: Route): Promise<void> {
       setupPostEdit(config.collection)
     }
 
+    // Setup chat edit form
+    if (route.type === 'chat-edit' && isOwner) {
+      const chatCollection = config.chatCollection || 'ai.syui.log.chat'
+      setupChatEdit(chatCollection, handle)
+    }
+
     // Setup validate button for record detail
     if (currentRecord) {
       setupValidateButton(currentRecord)
@@ -564,6 +595,49 @@ function setupPostEdit(collection: string): void {
   })
 }
 
+// Setup chat edit form
+function setupChatEdit(collection: string, handle: string): void {
+  const form = document.getElementById('chat-edit-form') as HTMLFormElement
+  const contentInput = document.getElementById('chat-edit-content') as HTMLTextAreaElement
+  const saveBtn = document.getElementById('chat-edit-save') as HTMLButtonElement
+  const statusEl = document.getElementById('chat-edit-status') as HTMLDivElement
+
+  if (!form || !saveBtn) return
+
+  form.addEventListener('submit', async (e) => {
+    e.preventDefault()
+
+    const rkey = saveBtn.getAttribute('data-rkey')
+    if (!rkey || !contentInput) return
+
+    const content = contentInput.value.trim()
+
+    if (!content) {
+      alert('Content is required')
+      return
+    }
+
+    try {
+      saveBtn.textContent = 'Saving...'
+      saveBtn.disabled = true
+
+      await updateChat(collection, rkey, content)
+
+      statusEl.innerHTML = '<span class="chat-edit-success">Saved!</span>'
+
+      // Navigate back to chat thread
+      setTimeout(() => {
+        navigate({ type: 'chat-thread', handle, rkey })
+      }, 1000)
+    } catch (err) {
+      console.error('Update failed:', err)
+      statusEl.innerHTML = `<span class="chat-edit-error">Error: ${err}</span>`
+      saveBtn.textContent = 'Save'
+      saveBtn.disabled = false
+    }
+  })
+}
+
 // Initial render
 render(parseRoute())
 
diff --git a/src/web/styles/main.css b/src/web/styles/main.css
index e46943b..cee9c24 100644
--- a/src/web/styles/main.css
+++ b/src/web/styles/main.css
@@ -2510,3 +2510,133 @@ button.tab {
   line-height: 1.4;
   white-space: pre-line;
 }
+
+/* Chat Edit Button */
+.chat-edit-btn {
+  color: #888;
+  font-size: 0.8rem;
+  text-decoration: none;
+  margin-left: 8px;
+}
+
+.chat-edit-btn:hover {
+  color: var(--btn-color);
+  text-decoration: underline;
+}
+
+/* Chat Edit Form */
+.chat-edit-container {
+  max-width: 800px;
+  margin: 0 auto;
+  padding: 20px;
+}
+
+.chat-edit-container h2 {
+  margin-bottom: 20px;
+  font-size: 1.2rem;
+}
+
+.chat-edit-form {
+  display: flex;
+  flex-direction: column;
+  gap: 15px;
+}
+
+.chat-edit-content {
+  width: 100%;
+  padding: 12px;
+  border: 1px solid #ddd;
+  border-radius: 8px;
+  font-size: 1rem;
+  font-family: inherit;
+  resize: vertical;
+  min-height: 200px;
+}
+
+.chat-edit-content:focus {
+  outline: none;
+  border-color: var(--btn-color);
+}
+
+.chat-edit-footer {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+
+.chat-edit-collection {
+  color: #888;
+  font-size: 0.85rem;
+}
+
+.chat-edit-buttons {
+  display: flex;
+  gap: 10px;
+  align-items: center;
+}
+
+.chat-edit-cancel {
+  color: #666;
+  text-decoration: none;
+  padding: 8px 16px;
+}
+
+.chat-edit-cancel:hover {
+  text-decoration: underline;
+}
+
+.chat-edit-save {
+  background: var(--btn-color);
+  color: white;
+  border: none;
+  padding: 8px 20px;
+  border-radius: 6px;
+  cursor: pointer;
+  font-size: 0.95rem;
+}
+
+.chat-edit-save:hover {
+  opacity: 0.9;
+}
+
+.chat-edit-save:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+.chat-edit-status {
+  margin-top: 10px;
+}
+
+.chat-edit-success {
+  color: #22c55e;
+}
+
+.chat-edit-error {
+  color: #ef4444;
+}
+
+/* Dark mode */
+@media (prefers-color-scheme: dark) {
+  .chat-edit-btn {
+    color: #888;
+  }
+
+  .chat-edit-btn:hover {
+    color: var(--btn-color);
+  }
+
+  .chat-edit-content {
+    background: #1a1a1a;
+    border-color: #333;
+    color: #e0e0e0;
+  }
+
+  .chat-edit-content:focus {
+    border-color: var(--btn-color);
+  }
+
+  .chat-edit-cancel {
+    color: #999;
+  }
+}