Free Online JPG Image Compression
Offline local lossless compression — images processed on your device, no upload.
ImageTool.app's online JPG compressor quickly reduces JPG file size to a target such as 50kb, 100kb or 200kb while keeping images sharp. Everything runs locally — no upload required.
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Drop image files here to compress online, losslessly
Unlike online tools that upload your files to third-party servers, ImgZilla compresses JPG fast and entirely locally, with virtually no quality loss. 100% local, no signup, no subscription.
Why local JPG compression
Faster batches
Compress JPG quickly even on an ordinary computer — no upload waits, server queues or rate limits.
Zero upload, more privacy
Files always stay local, never uploaded to any third-party server — client material and private photos stay safe.
No file size limit
Easily handle tens-of-MB shots from wedding proofs or medium-format cameras, free of the size caps online tools usually impose.
Quality stays sharp
A perceptual visual compression algorithm keeps sharp edges and only compresses flat areas aggressively — the difference is barely visible.
How to compress JPG
Drop in a JPG
Just drag your JPG in — no upload.
Export
Export right after compression — no ZIP packaging, no waiting on a server.
FAQ
The before/after difference is nearly imperceptible, typically shrinking 50–80% (e.g. 4MB down to 800KB–1.2MB).
No. Compression happens entirely locally; your images never leave your device.
They're exactly the same format, just different file extensions, stemming from early Windows limits on extension length.
The online tool is great for a few images quickly; the desktop app supports unlimited batches and multi-threaded whole-folder compression.
Download ImgZilla for faster batch compression
Want faster batch compression and stronger privacy? The ImgZilla desktop app does everything locally on your Mac — just drag and drop.
- 100% local processing — images are never uploaded
- Multi-threaded batch compression, up to 90% smaller
- Originals auto-backed up to Trash, recoverable anytime
- Compare before and after with the built-in image compare tool