diff --git a/package-lock.json b/package-lock.json
index ac86fe32..19819ec3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -18,6 +18,7 @@
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         "pino": "^9.6.0",
         "pino-pretty": "^13.0.0",
+        "sharp": "^0.34.5",
         "zod": "^4.3.6"
       },
       "devDependencies": {
@@ -120,6 +121,16 @@
         "node": ">=18"
       }
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+    "node_modules/@emnapi/runtime": {
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+      "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.9.0.tgz",
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+      "optional": true,
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       "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.3.tgz",
@@ -753,6 +764,15 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@img/colour": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@img/colour/-/colour-1.1.0.tgz",
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+      "license": "MIT",
+      "engines": {
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+      }
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       "version": "0.33.5",
       "resolved": "https://registry.npmjs.org/@img/sharp-darwin-arm64/-/sharp-darwin-arm64-0.33.5.tgz",
@@ -861,6 +881,54 @@
         "url": "https://opencollective.com/libvips"
       }
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+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-ppc64/-/sharp-libvips-linux-ppc64-1.2.4.tgz",
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+      "funding": {
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+      "resolved": "https://registry.npmjs.org/@img/sharp-libvips-linux-s390x/-/sharp-libvips-linux-s390x-1.2.4.tgz",
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+      "funding": {
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@@ -953,6 +1021,72 @@
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+      "resolved": "https://registry.npmjs.org/@img/sharp-linux-s390x/-/sharp-linux-s390x-0.34.5.tgz",
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+      "cpu": [
+        "s390x"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
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@@ -1019,6 +1153,63 @@
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       }
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+    "node_modules/@img/sharp-win32-arm64": {
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+      "resolved": "https://registry.npmjs.org/@img/sharp-win32-ia32/-/sharp-win32-ia32-0.34.5.tgz",
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@@ -4428,6 +4619,335 @@
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+      "license": "Apache-2.0",
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+        "detect-libc": "^2.1.2",
+        "semver": "^7.7.3"
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+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linux-arm64": "1.2.4"
+      }
+    },
+    "node_modules/sharp/node_modules/@img/sharp-linux-x64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linux-x64/-/sharp-linux-x64-0.34.5.tgz",
+      "integrity": "sha512-MEzd8HPKxVxVenwAa+JRPwEC7QFjoPWuS5NZnBt6B3pu7EG2Ge0id1oLHZpPJdn3OQK+BQDiw9zStiHBTJQQQQ==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linux-x64": "1.2.4"
+      }
+    },
+    "node_modules/sharp/node_modules/@img/sharp-linuxmusl-arm64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linuxmusl-arm64/-/sharp-linuxmusl-arm64-0.34.5.tgz",
+      "integrity": "sha512-fprJR6GtRsMt6Kyfq44IsChVZeGN97gTD331weR1ex1c1rypDEABN6Tm2xa1wE6lYb5DdEnk03NZPqA7Id21yg==",
+      "cpu": [
+        "arm64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linuxmusl-arm64": "1.2.4"
+      }
+    },
+    "node_modules/sharp/node_modules/@img/sharp-linuxmusl-x64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-linuxmusl-x64/-/sharp-linuxmusl-x64-0.34.5.tgz",
+      "integrity": "sha512-Jg8wNT1MUzIvhBFxViqrEhWDGzqymo3sV7z7ZsaWbZNDLXRJZoRGrjulp60YYtV4wfY8VIKcWidjojlLcWrd8Q==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "Apache-2.0",
+      "optional": true,
+      "os": [
+        "linux"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      },
+      "optionalDependencies": {
+        "@img/sharp-libvips-linuxmusl-x64": "1.2.4"
+      }
+    },
+    "node_modules/sharp/node_modules/@img/sharp-win32-x64": {
+      "version": "0.34.5",
+      "resolved": "https://registry.npmjs.org/@img/sharp-win32-x64/-/sharp-win32-x64-0.34.5.tgz",
+      "integrity": "sha512-+29YMsqY2/9eFEiW93eqWnuLcWcufowXewwSNIT6UwZdUUCrM3oFjMWH/Z6/TMmb4hlFenmfAVbpWeup2jryCw==",
+      "cpu": [
+        "x64"
+      ],
+      "license": "Apache-2.0 AND LGPL-3.0-or-later",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": "^18.17.0 || ^20.3.0 || >=21.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/libvips"
+      }
+    },
     "node_modules/shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -4840,6 +5360,13 @@
         "typescript": ">=4.8.4"
       }
     },
+    "node_modules/tslib": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+      "license": "0BSD",
+      "optional": true
+    },
     "node_modules/tsx": {
       "version": "4.21.0",
       "resolved": "https://registry.npmjs.org/tsx/-/tsx-4.21.0.tgz",
diff --git a/package.json b/package.json
index e5b1bed1..ede51073 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
     "openai": "^6.25.0",
     "pino": "^9.6.0",
     "pino-pretty": "^13.0.0",
+    "sharp": "^0.34.5",
     "zod": "^4.3.6"
   },
   "optionalDependencies": {
diff --git a/src/feishu/event-handler.ts b/src/feishu/event-handler.ts
index 779bf51a..7389a503 100644
--- a/src/feishu/event-handler.ts
+++ b/src/feishu/event-handler.ts
@@ -36,6 +36,7 @@ import { handleMemoryCommand, handleMemoryCardAction } from '../memory/commands.
 import { getRepoIdentity } from '../workspace/identity.js';
 import { generateQuickAck } from '../utils/quick-ack.js';
 import { checkThreadRelevance } from '../utils/thread-relevance.js';
+import { compressImage } from '../utils/image-compress.js';
 
 // 注册审批通过后的消息重新入队回调（避免 approval.ts → event-handler.ts 循环依赖）
 setOnApproved((chatId, userId, text, messageId, rootId, threadId) => {
@@ -2274,7 +2275,11 @@ async function parseMessage(data: MessageEventData): Promise<ParsedMessage | nul
               continue;
             }
             const mediaType = detectImageMediaType(buf);
-            images.push({ data: buf.toString('base64'), mediaType });
+            const compressed = await compressImage(buf, mediaType);
+            if (compressed.data.length < buf.length) {
+              logger.info({ imageKey, originalSize: buf.length, compressedSize: compressed.data.length, ratio: `${(compressed.data.length / buf.length * 100).toFixed(0)}%` }, 'Image compressed');
+            }
+            images.push({ data: compressed.data.toString('base64'), mediaType: compressed.mediaType });
           } catch (err) {
             logger.error({ err, messageId: message.message_id, imageKey }, 'Failed to download post image');
           }
@@ -2305,7 +2310,11 @@ async function parseMessage(data: MessageEventData): Promise<ParsedMessage | nul
       }
 
       const mediaType = detectImageMediaType(buf);
-      images = [{ data: buf.toString('base64'), mediaType }];
+      const compressed = await compressImage(buf, mediaType);
+      if (compressed.data.length < buf.length) {
+        logger.info({ messageId: message.message_id, originalSize: buf.length, compressedSize: compressed.data.length, ratio: `${(compressed.data.length / buf.length * 100).toFixed(0)}%` }, 'Image compressed');
+      }
+      images = [{ data: compressed.data.toString('base64'), mediaType: compressed.mediaType }];
     } catch (err) {
       logger.error({ err, messageId: message.message_id }, 'Failed to process image message');
       await feishuClient.replyText(message.message_id, '⚠️ 图片下载失败，请稍后重试');
diff --git a/src/utils/__tests__/image-compress.test.ts b/src/utils/__tests__/image-compress.test.ts
new file mode 100644
index 00000000..caadd91b
--- /dev/null
+++ b/src/utils/__tests__/image-compress.test.ts
@@ -0,0 +1,127 @@
+import { describe, it, expect, vi } from 'vitest';
+import { randomBytes } from 'node:crypto';
+import sharp from 'sharp';
+
+vi.mock('../logger.js', () => ({
+  logger: {
+    warn: vi.fn(),
+    info: vi.fn(),
+  },
+}));
+
+import { compressImage } from '../image-compress.js';
+
+/**
+ * Create a noisy raw pixel buffer and encode to JPEG.
+ * Random pixels create incompressible data, resulting in large files.
+ */
+async function createNoisyJpeg(width: number, height: number, quality = 95): Promise<Buffer> {
+  const raw = randomBytes(width * height * 3);
+  return sharp(raw, { raw: { width, height, channels: 3 } })
+    .jpeg({ quality })
+    .toBuffer();
+}
+
+
+describe('compressImage', () => {
+  it('should pass through small images unchanged', async () => {
+    const small = await sharp({
+      create: { width: 50, height: 50, channels: 3, background: { r: 128, g: 64, b: 32 } },
+    }).jpeg({ quality: 80 }).toBuffer();
+    expect(small.length).toBeLessThan(100 * 1024);
+
+    const result = await compressImage(small, 'image/jpeg');
+    expect(result.data).toBe(small); // same reference = unchanged
+    expect(result.mediaType).toBe('image/jpeg');
+  });
+
+  it('should compress large JPEG images', async () => {
+    const large = await createNoisyJpeg(3000, 2000);
+    expect(large.length).toBeGreaterThan(100 * 1024);
+
+    const result = await compressImage(large, 'image/jpeg');
+    expect(result.data.length).toBeLessThan(large.length);
+    expect(result.mediaType).toBe('image/jpeg');
+
+    // Verify dimensions were reduced
+    const meta = await sharp(result.data).metadata();
+    expect(Math.max(meta.width!, meta.height!)).toBeLessThanOrEqual(1536);
+  });
+
+  it('should keep PNG as PNG when result fits target', async () => {
+    // Solid-color PNG compresses very well — should stay PNG
+    const png = await sharp({
+      create: { width: 2000, height: 2000, channels: 4, background: { r: 200, g: 100, b: 50, alpha: 255 } },
+    }).png().toBuffer();
+
+    const result = await compressImage(png, 'image/png');
+    expect(result.mediaType).toBe('image/png');
+    expect(result.data.length).toBeLessThan(750 * 1024);
+  });
+
+  it('should handle WebP as photo (output JPEG)', async () => {
+    const raw = randomBytes(2000 * 1500 * 3);
+    const webp = await sharp(raw, { raw: { width: 2000, height: 1500, channels: 3 } })
+      .webp({ quality: 95 })
+      .toBuffer();
+    expect(webp.length).toBeGreaterThan(100 * 1024);
+
+    const result = await compressImage(webp, 'image/webp');
+    expect(result.mediaType).toBe('image/jpeg');
+  });
+
+  it('should extract first frame from GIF (output JPEG)', async () => {
+    const raw = randomBytes(800 * 800 * 4);
+    const gif = await sharp(raw, { raw: { width: 800, height: 800, channels: 4 } })
+      .gif()
+      .toBuffer();
+    expect(gif.length).toBeGreaterThan(100 * 1024);
+
+    const result = await compressImage(gif, 'image/gif');
+    expect(result.mediaType).toBe('image/jpeg');
+  });
+
+  it('should gracefully fallback on corrupted buffer', async () => {
+    const garbage = Buffer.from('not-a-real-image-at-all-just-garbage-data'.repeat(3000));
+
+    const result = await compressImage(garbage, 'image/jpeg');
+    expect(result.data).toBe(garbage);
+    expect(result.mediaType).toBe('image/jpeg');
+  });
+
+  it('should strip EXIF metadata', async () => {
+    const noisy = await createNoisyJpeg(2000, 1500);
+    // Add EXIF metadata
+    const withMeta = await sharp(noisy)
+      .withMetadata({ exif: { IFD0: { Copyright: 'Test' } } })
+      .jpeg({ quality: 95 })
+      .toBuffer();
+    expect(withMeta.length).toBeGreaterThan(100 * 1024);
+
+    const beforeMeta = await sharp(withMeta).metadata();
+    expect(beforeMeta.exif).toBeDefined();
+
+    const result = await compressImage(withMeta, 'image/jpeg');
+    const outputMeta = await sharp(result.data).metadata();
+    expect(outputMeta.exif).toBeUndefined();
+  });
+
+  it('should preserve aspect ratio', async () => {
+    const wide = await createNoisyJpeg(4000, 1000); // 4:1 ratio
+
+    const result = await compressImage(wide, 'image/jpeg');
+    const meta = await sharp(result.data).metadata();
+
+    const ratio = meta.width! / meta.height!;
+    expect(ratio).toBeCloseTo(4.0, 0);
+  });
+
+  it('should keep output under target size for large photos', async () => {
+    const large = await createNoisyJpeg(4000, 3000);
+    expect(large.length).toBeGreaterThan(100 * 1024);
+
+    const result = await compressImage(large, 'image/jpeg');
+    expect(result.data.length).toBeLessThan(750 * 1024);
+    expect(result.mediaType).toBe('image/jpeg');
+  });
+});
diff --git a/src/utils/image-compress.ts b/src/utils/image-compress.ts
new file mode 100644
index 00000000..d55e9aeb
--- /dev/null
+++ b/src/utils/image-compress.ts
@@ -0,0 +1,151 @@
+import sharp from 'sharp';
+import { logger } from './logger.js';
+import type { ImageAttachment } from '../claude/types.js';
+
+type ImageMediaType = ImageAttachment['mediaType'];
+
+/** Target max raw bytes before base64 encoding (~1MB base64) */
+const TARGET_RAW_BYTES = 750 * 1024;
+
+/** Skip compression for images under this size */
+const COMPRESS_THRESHOLD_BYTES = 100 * 1024;
+
+/** Max dimension on longest side (first pass) */
+const MAX_DIMENSION = 1536;
+
+/** Fallback dimension if first pass still too large */
+const FALLBACK_DIMENSION = 1024;
+
+/** JPEG quality for photos */
+const JPEG_QUALITY = 80;
+
+/** More aggressive JPEG quality for second pass */
+const JPEG_QUALITY_AGGRESSIVE = 70;
+
+/** JPEG quality for last-resort PNG→JPEG conversion */
+const JPEG_QUALITY_FALLBACK = 85;
+
+export interface CompressedImage {
+  data: Buffer;
+  mediaType: ImageMediaType;
+}
+
+/**
+ * Compress an image to keep base64 output under ~1MB.
+ * - JPEG/WebP/GIF → resize + JPEG output
+ * - PNG → resize + PNG output, falls back to JPEG if still too large
+ * - GIF → extract first frame
+ * - Graceful fallback: returns original on any error
+ */
+export async function compressImage(
+  buf: Buffer,
+  originalMediaType: ImageMediaType,
+): Promise<CompressedImage> {
+  if (buf.length <= COMPRESS_THRESHOLD_BYTES) {
+    return { data: buf, mediaType: originalMediaType };
+  }
+
+  try {
+    return await doCompress(buf, originalMediaType);
+  } catch (err) {
+    logger.warn(
+      { err, originalSize: buf.length, mediaType: originalMediaType },
+      'Image compression failed, using original',
+    );
+    return { data: buf, mediaType: originalMediaType };
+  }
+}
+
+async function doCompress(
+  buf: Buffer,
+  mediaType: ImageMediaType,
+): Promise<CompressedImage> {
+  const meta = await sharp(buf).metadata();
+  const longestSide = Math.max(meta.width ?? 0, meta.height ?? 0);
+
+  const isPhoto = mediaType === 'image/jpeg' || mediaType === 'image/webp' || mediaType === 'image/gif';
+
+  if (isPhoto) {
+    return compressAsJpeg(buf, mediaType, longestSide);
+  }
+
+  // PNG: try to keep as PNG
+  return compressAsPng(buf, longestSide);
+}
+
+async function compressAsJpeg(
+  buf: Buffer,
+  mediaType: ImageMediaType,
+  longestSide: number,
+): Promise<CompressedImage> {
+  // GIF: extract first frame only
+  const input = mediaType === 'image/gif'
+    ? sharp(buf, { pages: 1 })
+    : sharp(buf);
+
+  // Auto-rotate from EXIF then strip metadata
+  const pipeline = input.rotate();
+
+  const resized = longestSide > MAX_DIMENSION
+    ? pipeline.resize({ width: MAX_DIMENSION, height: MAX_DIMENSION, fit: 'inside' })
+    : pipeline;
+
+  const result = await resized.jpeg({ quality: JPEG_QUALITY, mozjpeg: true }).toBuffer();
+
+  if (result.length <= TARGET_RAW_BYTES) {
+    return { data: result, mediaType: 'image/jpeg' };
+  }
+
+  // Still too large → more aggressive (preserve GIF first-frame extraction)
+  const aggressiveInput = mediaType === 'image/gif' ? sharp(buf, { pages: 1 }) : sharp(buf);
+  const smaller = await aggressiveInput
+    .rotate()
+    .resize({ width: FALLBACK_DIMENSION, height: FALLBACK_DIMENSION, fit: 'inside' })
+    .jpeg({ quality: JPEG_QUALITY_AGGRESSIVE, mozjpeg: true })
+    .toBuffer();
+
+  if (smaller.length > TARGET_RAW_BYTES) {
+    logger.warn(
+      { size: smaller.length, target: TARGET_RAW_BYTES },
+      'Image still exceeds target after aggressive compression',
+    );
+  }
+
+  return { data: smaller, mediaType: 'image/jpeg' };
+}
+
+async function compressAsPng(
+  buf: Buffer,
+  longestSide: number,
+): Promise<CompressedImage> {
+  // First pass: resize to MAX_DIMENSION
+  const resized = longestSide > MAX_DIMENSION
+    ? sharp(buf).rotate().resize({ width: MAX_DIMENSION, height: MAX_DIMENSION, fit: 'inside' })
+    : sharp(buf).rotate();
+
+  const pngResult = await resized.png({ compressionLevel: 9 }).toBuffer();
+
+  if (pngResult.length <= TARGET_RAW_BYTES) {
+    return { data: pngResult, mediaType: 'image/png' };
+  }
+
+  // Second pass: resize to FALLBACK_DIMENSION
+  const smallerPng = await sharp(buf)
+    .rotate()
+    .resize({ width: FALLBACK_DIMENSION, height: FALLBACK_DIMENSION, fit: 'inside' })
+    .png({ compressionLevel: 9 })
+    .toBuffer();
+
+  if (smallerPng.length <= TARGET_RAW_BYTES) {
+    return { data: smallerPng, mediaType: 'image/png' };
+  }
+
+  // Last resort: convert to JPEG
+  const jpegFallback = await sharp(buf)
+    .rotate()
+    .resize({ width: FALLBACK_DIMENSION, height: FALLBACK_DIMENSION, fit: 'inside' })
+    .jpeg({ quality: JPEG_QUALITY_FALLBACK, mozjpeg: true })
+    .toBuffer();
+
+  return { data: jpegFallback, mediaType: 'image/jpeg' };
+}