diff --git a/docs/roadmap-resenha.md b/docs/roadmap-resenha.md
index 791b5096..2aaf80b5 100644
--- a/docs/roadmap-resenha.md
+++ b/docs/roadmap-resenha.md
@@ -72,6 +72,7 @@ fixas por `t('chave')`. O que faltar cai para o inglês sozinho.
 - Configurações → Privacidade
 - Configurações → Conexões (nasceu bilíngue)
 - Seletor de GIF
+- Chat: composer e mensagens (placeholder, anexos, responder, reações)
 - Registro de auditoria e Estatísticas (nasceram bilíngues)
 
 ### Fila sugerida de tradução
diff --git a/packages/web/src/components/chat/Message.tsx b/packages/web/src/components/chat/Message.tsx
index 2b0c6e40..11544225 100644
--- a/packages/web/src/components/chat/Message.tsx
+++ b/packages/web/src/components/chat/Message.tsx
@@ -1,4 +1,5 @@
 import React, { useState, useRef, useEffect, useCallback } from 'react';
+import { useT } from '../../i18n';
 import { createPortal } from 'react-dom';
 import type { MessageWithUser, Embed, User } from '@backspace/shared';
 import { MarkdownRenderer } from './MarkdownRenderer';
@@ -131,6 +132,7 @@ export function Message({ message, isCompact, isFirstInGroup, previousMessageId
   const editMessage = useChatStore((s) => s.editMessage);
   const deleteMessage = useChatStore((s) => s.deleteMessage);
   const members = useSpaceStore((s) => s.members);
+  const tr = useT();
   const openUserProfile = useUIStore((s) => s.openUserProfile);
 
   const pending = isPendingMessage(message) ? message.__pending : null;
@@ -676,7 +678,7 @@ export function Message({ message, isCompact, isFirstInGroup, previousMessageId
                 className={`p-1 hover:bg-interactive-hover rounded transition-colors text-[14px] leading-none ${
                   showReactionPicker ? 'text-accent-primary' : 'text-txt-tertiary hover:text-txt-secondary'
                 }`}
-                title="Add reaction"
+                title={tr('chat.message.addReaction')}
               >
                 <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
                   <path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm1-13h-2v4H7v2h4v4h2v-4h4v-2h-4V7z" />
@@ -687,7 +689,7 @@ export function Message({ message, isCompact, isFirstInGroup, previousMessageId
           <button
             onClick={() => setReplyTo(message)}
             className="px-2 h-full text-txt-tertiary hover:text-txt-primary hover:bg-interactive-hover transition-all flex items-center justify-center"
-            title="Reply"
+            title={tr('chat.message.reply')}
           >
             <svg width="20" height="20" viewBox="0 0 24 24" fill="currentColor">
               <path d="M10 9V5L3 12L10 19V14.9C15 14.9 18.5 16.5 21 20C20 15 17 10 10 9Z" />
@@ -700,7 +702,7 @@ export function Message({ message, isCompact, isFirstInGroup, previousMessageId
                 setIsEditing(true);
               }}
               className="px-2 h-full text-txt-tertiary hover:text-txt-primary hover:bg-interactive-hover transition-all flex items-center justify-center"
-              title="Edit"
+              title={tr('chat.message.edit')}
             >
               <svg width="20" height="20" viewBox="0 0 24 24" fill="currentColor">
                 <path d="M19.14 12.94c.04-.3.06-.61.06-.94 0-.32-.02-.64-.07-.94l2.03-1.58c.18-.14.23-.41.12-.61l-1.92-3.32c-.12-.22-.37-.29-.59-.22l-2.39.96c-.5-.38-1.03-.7-1.62-.94l-.36-2.54c-.04-.24-.24-.41-.48-.41h-3.84c-.24 0-.43.17-.47.41l-.36 2.54c-.59.24-1.13.57-1.62.94l-2.39-.96c-.22-.08-.47 0-.59.22L2.74 8.87c-.12.21-.08.47.12.61l2.03 1.58c-.05.3-.07.62-.07.94s.02.64.07.94l-2.03 1.58c-.18.14-.23.41-.12.61l1.92 3.32c.12.22.37.29.59.22l2.39-.96c.5.38 1.03.7 1.62.94l.36 2.54c.05.24.24.41.48.41h3.84c.24 0 .44-.17.47-.41l.36-2.54c.59-.24 1.13-.56 1.62-.94l2.39.96c.22.08.47 0 .59-.22l1.92-3.32c.12-.22.07-.47-.12-.61l-2.01-1.58zM12 15.6c-1.98 0-3.6-1.62-3.6-3.6s1.62-3.6 3.6-3.6 3.6 1.62 3.6 3.6-1.62 3.6-3.6 3.6z" />
diff --git a/packages/web/src/components/chat/MessageInput.tsx b/packages/web/src/components/chat/MessageInput.tsx
index da430cf4..37dfd6e9 100644
--- a/packages/web/src/components/chat/MessageInput.tsx
+++ b/packages/web/src/components/chat/MessageInput.tsx
@@ -1,4 +1,5 @@
 import React, { useState, useRef, useCallback, useMemo, useEffect } from 'react';
+import { useT } from '../../i18n';
 import { useChatStore } from '../../stores/chatStore';
 import { isDmChannel, getChannelOrigin, useSpaceStore } from '../../stores/spaceStore';
 import { wsSend } from '../../hooks/useWebSocket';
@@ -94,6 +95,7 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
   const typingTimeoutRef = useRef<ReturnType<typeof setTimeout>>();
 
   // Feature flags
+  const tr = useT();
   const gifEnabled = useSettingsStore((s) => s.gifEnabled);
 
   // Permission gating: DM channels always allow sending; space channels check SEND_MESSAGES
@@ -775,7 +777,7 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
       {chatReplyTo && (
         <div className="bg-interactive-hover rounded-t-lg px-4 py-2 flex items-center justify-between border-b border-white/[0.06]">
           <div className="flex items-center gap-1 text-[14px] text-txt-message truncate">
-            <span className="opacity-60">Replying to</span>
+            <span className="opacity-60">{tr('chat.composer.replyingTo')}</span>
             <span className="font-bold">
               {chatReplyTo.user.displayName ?? chatReplyTo.user.username}
             </span>
@@ -783,7 +785,7 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
           <button
             onClick={() => chatSetReplyTo(null)}
             className="text-txt-tertiary hover:text-txt-primary transition-colors"
-            aria-label="Cancel reply"
+            aria-label={tr('chat.composer.cancelReply')}
           >
             <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
               <path d="M18.4 4L12 10.4L5.6 4L4 5.6L10.4 12L4 18.4L5.6 20L12 13.6L18.4 20L20 18.4L13.6 12L20 5.6L18.4 4Z" />
@@ -867,7 +869,7 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
                     <button
                       onClick={() => removeStagedTransfer(t.id)}
                       className="absolute -top-2 -right-2 w-7 h-7 bg-accent-rose hover:bg-accent-rose/80 shadow-elevation-high rounded-lg flex items-center justify-center text-white transition-colors z-10"
-                      aria-label="Remove attachment"
+                      aria-label={tr('chat.composer.removeAttachment')}
                     >
                       <svg width="14" height="14" viewBox="0 0 16 16" fill="currentColor">
                         <path d="M5 2a1 1 0 011-1h4a1 1 0 011 1v1h3a1 1 0 110 2h-.08L13 14a2 2 0 01-2 2H5a2 2 0 01-2-2L2.08 5H2a1 1 0 110-2h3V2zm2 0v1h2V2H7z" />
@@ -886,8 +888,8 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
             <button
               onClick={() => fileInputRef.current?.click()}
               className="w-10 h-10 md:w-[34px] md:h-[34px] flex items-center justify-center rounded-[6px] text-txt-tertiary hover:text-txt-secondary transition-colors flex-shrink-0"
-              title="Attach file"
-              aria-label="Attach file"
+              title={tr('chat.composer.attach')}
+              aria-label={tr('chat.composer.attach')}
             >
               <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor">
                 <path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm5 11h-4v4h-2v-4H7v-2h4V7h2v4h4v2z" />
@@ -915,14 +917,16 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
             onChange={handleChange}
             onKeyDown={handleKeyDown}
             onPaste={canAttachFiles ? handlePaste : undefined}
-            placeholder={placeholder ?? `Message ${channelName.startsWith('@') ? channelName : `#${channelName}`}`}
+            placeholder={placeholder ?? tr('chat.composer.placeholder', {
+              channel: channelName.startsWith('@') ? channelName : `#${channelName}`,
+            })}
             className="input-embedded flex-1 py-[10px] px-1 resize-none text-[15px] leading-[1.375rem] max-h-[50vh] scrollbar-thin"
             rows={1}
           />
 
           {/* Active-upload indicator */}
           {anyActiveOrQueued && (
-            <div className="p-3 text-txt-tertiary" title="Uploading…" aria-label="Uploading">
+            <div className="p-3 text-txt-tertiary" title={tr('chat.composer.uploadingEllipsis')} aria-label={tr('chat.composer.uploading')}>
               <svg className="w-5 h-5 animate-spin" viewBox="0 0 24 24" fill="none">
                 <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
                 <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
@@ -934,7 +938,7 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
           {failedCount > 0 && (
             <span
               className="text-[12px] font-medium text-accent-rose px-1 flex-shrink-0"
-              title="Remove or retry the failed attachment to send"
+              title={tr('chat.composer.failedAttachment')}
             >
               {failedCount} failed
             </span>
@@ -956,8 +960,8 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
               className={`w-10 h-10 md:w-[34px] md:h-[34px] flex items-center justify-center rounded-[6px] transition-colors flex-shrink-0 ${
                 activePopover === 'gif' ? 'text-accent-primary' : 'text-txt-tertiary hover:text-txt-secondary'
               }`}
-              title="GIF"
-              aria-label="GIF picker"
+              title={tr('chat.composer.gif')}
+              aria-label={tr('chat.composer.gifPicker')}
             >
               {/* Outlined badge, not a filled block: the solid rectangle read as
                   a plain square rather than a GIF picker. Letters reuse the
@@ -977,8 +981,8 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
             className={`w-10 h-10 md:w-[34px] md:h-[34px] flex items-center justify-center rounded-[6px] transition-colors flex-shrink-0 ${
               activePopover === 'emoji' ? 'text-accent-primary' : 'text-txt-tertiary hover:text-txt-secondary'
             }`}
-            title="Emoji"
-            aria-label="Emoji picker"
+            title={tr('chat.composer.emoji')}
+            aria-label={tr('chat.composer.emojiPicker')}
           >
             <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor">
               <path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm3.5-9c.83 0 1.5-.67 1.5-1.5S16.33 8 15.5 8 14 8.67 14 9.5s.67 1.5 1.5 1.5zm-7 0c.83 0 1.5-.67 1.5-1.5S9.33 8 8.5 8 7 8.67 7 9.5s.67 1.5 1.5 1.5zm3.5 6.5c2.33 0 4.31-1.46 5.11-3.5H6.89c.8 2.04 2.78 3.5 5.11 3.5z" />
@@ -991,8 +995,8 @@ export function MessageInput({ channelId, channelName, placeholder }: MessageInp
               onClick={() => void handleSubmit()}
               disabled={anyUnshippable}
               className="w-10 h-10 md:w-[34px] md:h-[34px] flex items-center justify-center rounded-[6px] bg-accent-primary hover:bg-accent-primary-hover text-white transition-all duration-150 flex-shrink-0 disabled:opacity-50"
-              aria-label="Send message"
-              title="Send"
+              aria-label={tr('chat.composer.sendMessage')}
+              title={tr('chat.composer.send')}
             >
               <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
                 <path d="M3.4 20.4l17.45-7.48a1 1 0 000-1.84L3.4 3.6a.993.993 0 00-1.39.91L2 9.12c0 .5.37.93.87.99L17 12 2.87 13.88c-.5.07-.87.5-.87 1l.01 4.61c0 .71.73 1.2 1.39.91z" />
diff --git a/packages/web/src/i18n/locales/en.ts b/packages/web/src/i18n/locales/en.ts
index ae474805..7234ce78 100644
--- a/packages/web/src/i18n/locales/en.ts
+++ b/packages/web/src/i18n/locales/en.ts
@@ -56,6 +56,25 @@ export const en = {
   'accountMenu.copyId': 'Copy User ID',
   'accountMenu.copied': 'Copied',
 
+  // Chat — composer and messages
+  'chat.composer.placeholder': 'Message {channel}',
+  'chat.composer.attach': 'Attach file',
+  'chat.composer.emoji': 'Emoji',
+  'chat.composer.gif': 'GIF',
+  'chat.composer.gifPicker': 'GIF picker',
+  'chat.composer.emojiPicker': 'Emoji picker',
+  'chat.composer.send': 'Send',
+  'chat.composer.sendMessage': 'Send message',
+  'chat.composer.uploading': 'Uploading',
+  'chat.composer.uploadingEllipsis': 'Uploading…',
+  'chat.composer.removeAttachment': 'Remove attachment',
+  'chat.composer.failedAttachment': 'Remove or retry the failed attachment to send',
+  'chat.composer.replyingTo': 'Replying to',
+  'chat.composer.cancelReply': 'Cancel reply',
+  'chat.message.addReaction': 'Add reaction',
+  'chat.message.edit': 'Edit',
+  'chat.message.reply': 'Reply',
+
   // Statistics
   'stats.title': 'Statistics',
   'stats.range.7': 'Last 7 days',
diff --git a/packages/web/src/i18n/locales/pt-BR.ts b/packages/web/src/i18n/locales/pt-BR.ts
index 11d94fe8..23307bb5 100644
--- a/packages/web/src/i18n/locales/pt-BR.ts
+++ b/packages/web/src/i18n/locales/pt-BR.ts
@@ -55,6 +55,25 @@ export const ptBR: Partial<Dictionary> = {
   'accountMenu.copyId': 'Copiar ID do usuário',
   'accountMenu.copied': 'Copiado',
 
+  // Chat — composer e mensagens
+  'chat.composer.placeholder': 'Conversar em {channel}',
+  'chat.composer.attach': 'Anexar arquivo',
+  'chat.composer.emoji': 'Emoji',
+  'chat.composer.gif': 'GIF',
+  'chat.composer.gifPicker': 'Seletor de GIF',
+  'chat.composer.emojiPicker': 'Seletor de emoji',
+  'chat.composer.send': 'Enviar',
+  'chat.composer.sendMessage': 'Enviar mensagem',
+  'chat.composer.uploading': 'Enviando',
+  'chat.composer.uploadingEllipsis': 'Enviando…',
+  'chat.composer.removeAttachment': 'Remover anexo',
+  'chat.composer.failedAttachment': 'Remova ou tente de novo o anexo que falhou para poder enviar',
+  'chat.composer.replyingTo': 'Respondendo a',
+  'chat.composer.cancelReply': 'Cancelar resposta',
+  'chat.message.addReaction': 'Adicionar reação',
+  'chat.message.edit': 'Editar',
+  'chat.message.reply': 'Responder',
+
   // Estatísticas
   'stats.title': 'Estatísticas',
   'stats.range.7': 'Últimos 7 dias',