🗜️ Image Compressor
Compress JPEG, PNG, and WebP images without visible quality loss. Reduce file size up to 90%. Free online image compressor — runs in browser, images never uploaded to any server.
Drop image here or click to upload
PNG, JPG, WebP supported
How to Use
1
Upload your image
Drag and drop a PNG, JPG, or WebP image onto the upload area, or click to browse your files.
2
Adjust quality and format
Use the quality slider (1–100) to balance file size vs. visual quality. Choose JPEG or WebP for best compression.
3
Download compressed image
See the before/after file size comparison. Click Download to save the compressed image to your device.
Frequently Asked Questions
How does browser-based image compression work?
The tool uses the HTML5 Canvas API to re-encode your image at a lower quality level. The image is drawn onto a canvas element and exported as a JPEG or WebP at the quality you choose. This is the same technique used by many professional tools.
What image formats are supported?
PNG, JPG/JPEG, and WebP files are supported as input. The output format can be JPEG or WebP, which offer the best compression ratios. PNG uses lossless compression so quality stays at 100%.
Is my image uploaded to a server?
No. Your image never leaves your device. All compression happens entirely in your browser using the HTML5 Canvas API. This means your images are completely private.
What quality level should I use?
For most web images, 75–85% quality is a good balance between file size and visual quality. At 80%, you typically get 60–80% smaller files with no visible quality loss to the human eye.
Why is my PNG not getting smaller?
PNG uses lossless compression, so the quality slider does not apply. To significantly compress a PNG, convert it to JPEG or WebP format using the output format selector.
完整指南：图片压缩工具
为什么要压缩？
图片占大多数网页重量的50-70%。压缩图片是影响最大的Web性能优化：减少LCP（最大内容绘制），节省带宽，改善慢速连接上的体验。
如何使用
- 上传图片（JPEG、PNG、WebP）。
- 调整质量等级——75-85%通常是最佳点。
- 对比原图与压缩图并下载。
专业技巧
- 将JPEG转换为WebP可在相同质量下减小25-35%的体积。
- 装饰性背景图片质量60-70%通常视觉上无法察觉。
- 在
<img>上使用loading="lazy"延迟加载视口外图片。