Image
Image Compressor
Shrink JPG, PNG, and WebP images right in your browser with WASM codecs and side-by-side comparison.
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About this tool
Drop one or many images and tune the quality slider. The tool compresses images with browser-local WASM codecs: mozjpeg for JPG, libwebp for WebP, oxipng for PNG lossless optimization, and imagequant for PNG lossy palette compression.
Best results: JPG and WebP at 70–85% quality typically shrink photos with no obvious visible difference. PNG supports both lossless optimization and lossy palette quantization while staying in .png. WebP supports lossy and lossless modes.
Privacy
Processing happens in your browser whenever the tool can run locally. Your source files are not uploaded to PixWarp servers.
PixWarp vs upload tools
| Feature | PixWarp | Upload tools |
|---|---|---|
| File privacy | Runs in your browser | Often uploads to a server |
| Account required | No signup | May require login or email |
| Watermark | No watermark | Often adds branding on free plans |
Frequently asked questions
- Does my image get uploaded?
- No. Compression runs in your browser with WASM codecs. Your file never leaves your device.
- How does the quality slider work?
- For JPG and lossy WebP, the quality slider controls the compression level. In PNG lossy mode it reduces the palette with controlled quality loss while keeping a PNG output. PNG and WebP lossless modes disable the slider because the image data is preserved visually.
- Why is my PNG barely smaller?
- PNG size depends heavily on how many unique colors and transparent edges the image has. Flat graphics usually shrink well in PNG lossy mode, while already-optimized screenshots may only see a small reduction unless you switch away from lossless mode.
- What's the file size limit?
- There's no hard limit, but very large images (>50MP) may be slow on older devices because the browser has to decode and re-encode them in memory.