CompactJPG
Free browser image compressor that never uploads your files.
CompactJPG launched on June 18, 2026 with 2 votes.
What it does
Free image compressor that works entirely in your browser — no file uploads, ever. All compression runs locally via WebAssembly (MozJPEG + libwebp + OxiPNG). Supports JPEG, PNG, WebP & GIF. Batch compress multiple files. Drag, drop, download. No sign-up, no limits, no watermarks. Free forever. Perfect for developers optimizing assets or anyone who values privacy. 8 languages available. Most "online compressors" upload your files to servers. CompactJPG doesn't.
Free online image compressor. Compress JPEG, PNG, WebP, and GIF images in your browser. No upload to servers, 100% private. Reduce file size by up to 80%.
Compress and optimize your JPEG, PNG, WebP and GIF images. This free online tool uses advanced compression algorithms to reduce file sizes while maintaining quality. All processing happens in your browser – your files never leave your device. This tool runs entirely in your browser – no server uploads required. Add your images and click COMPRESS. The tool automatically analyzes each file and selects optimal compression settings. Once processing is complete, you can save the result immediately or use the comparison view to fine-tune quality with the slider. Each image can be adjusted individually before saving. Don't take our word for it. Here are actual compression results using CompactJPG.…from compactjpg.com
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Hi, so over the weekend I built a free to use service to compress one or more images using MozJEPG encoding enabled via WASM. It's a static site, all the processing happens on the client side, no file uploads or sign-ups needed! Why? The existing services are either filled with ads or require you to sign-up / pay. would greatly appreciate any feedback! TIA!
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