diff --git a/src/modules/whatsapp/whatsapp.controller.ts b/src/modules/whatsapp/whatsapp.controller.ts
index 8b4c1f7..880ab7e 100644
--- a/src/modules/whatsapp/whatsapp.controller.ts
+++ b/src/modules/whatsapp/whatsapp.controller.ts
@@ -1,5 +1,23 @@
 import { Controller, Get, Post, Body, Delete, Param, ForbiddenException, Query, UseInterceptors, UploadedFile, BadRequestException } from '@nestjs/common';
 import { FileInterceptor } from '@nestjs/platform-express';
+
+const ALLOWED_MEDIA_TYPES = new Set([
+  'image/jpeg', 'image/png', 'image/webp', 'image/gif',
+  'audio/mpeg', 'audio/mp4', 'audio/ogg', 'audio/wav', 'audio/aac', 'audio/amr',
+  'video/mp4', 'video/3gpp',
+  'application/pdf',
+  'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+  'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+  'application/msword',
+  'application/vnd.ms-excel',
+]);
+
+const MAX_SIZE_MB: Record<string, number> = {
+  image: 5,
+  audio: 16,
+  video: 16,
+  document: 100,
+};
 import { ApiBody, ApiOperation, ApiParam, ApiResponse, ApiTags } from '@nestjs/swagger';
 import { WhatsappService } from './whatsapp.service';
 import { AttendanceAssignmentService } from '../attendance/attendance-assignment.service';
@@ -68,7 +86,16 @@ export class WhatsappController {
   @ApiOperation({ summary: 'Envia mídia no WhatsApp' })
   @ApiResponse({ status: 201, description: 'Mídia enviada.' })
   @Post('send-media')
-  @UseInterceptors(FileInterceptor('file', { limits: { fileSize: 100 * 1024 * 1024 } }))
+  @UseInterceptors(FileInterceptor('file', {
+    limits: { fileSize: 100 * 1024 * 1024 },
+    fileFilter: (_req, file, cb) => {
+      if (ALLOWED_MEDIA_TYPES.has(file.mimetype)) {
+        cb(null, true);
+      } else {
+        cb(new BadRequestException(`Tipo de arquivo não suportado: ${file.mimetype}`), false);
+      }
+    },
+  }))
   async sendMediaMessage(
     @UploadedFile() file: Express.Multer.File,
     @Body('to') to: string,
@@ -77,6 +104,16 @@ export class WhatsappController {
   ) {
     if (!file) throw new BadRequestException('Arquivo não enviado.');
     if (!to) throw new BadRequestException('Destinatário (to) obrigatório.');
+
+    const mediaType = file.mimetype.startsWith('image/') ? 'image'
+      : file.mimetype.startsWith('audio/') ? 'audio'
+      : file.mimetype.startsWith('video/') ? 'video'
+      : 'document';
+    const limitMB = MAX_SIZE_MB[mediaType];
+    if (file.size > limitMB * 1024 * 1024) {
+      throw new BadRequestException(`Arquivo muito grande. Limite para ${mediaType}: ${limitMB} MB.`);
+    }
+
     return this.whatsappService.sendMediaMessage(to, file.buffer, file.mimetype, senderName, caption);
   }