Free online image tools
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 while keeping images sharp. Everything runs locally — no upload required.
Fast processing
No server upload — images are compressed right in your browser.
Privacy first
Files stay on your device. Nothing is stored, tracked, or shared.
Download freely
Grab the result instantly.
JPG compression
Why local JPG compression
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.
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.
Done in 2 steps
How to compress JPG
- 01
Drop in a JPG
Just drag your JPG in — no upload.
- 02
Export
Export right after compression — no ZIP packaging, no waiting on a server.
Will quality drop noticeably after compression?
The before/after difference is nearly imperceptible, typically shrinking 50–80% (e.g. 4MB down to 800KB–1.2MB).
Will my images be uploaded?
No. Compression happens entirely locally; your images never leave your device.
What's the difference between JPG and JPEG?
They're exactly the same format, just different file extensions, stemming from early Windows limits on extension length.
Can I batch-compress?
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
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