CompactJPG

Free browser image compressor that never uploads your files.

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.

Does the same job

all alternatives →

TinyJPG2014 · ▲178
Compress JPEG images with perfect quality and file size
AB
A bulk image compression service2024 · captaindavinci.github.io · ▲7
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!
Image CompressorJul 2026 · 99tools.net · ▲7
Compress JPG, PNG, GIF, AVIF & WebP images instantly
TinyWebKit Image CompressorFeb 2026 · ▲2
Compress images locally. No uploads, 100% privacy.
WebP CompressorApr 2026 · ▲2
WebP Compressor — Compress WebP Images Free, Instantly,
CompressIMGMay 2026 · compressimg.io · ▲1
Free online image compressor — no uploads, no limits

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