Are images uploaded to a server?
No, all processing happens in your browser.
Local-firstBatch-readyPNG / JPG / WebP
Compress Images Online, 100% in Your Browser
Automatically detect JPG, PNG, and WebP. No upload, no signup, and no server storage.
↑Upload Images→
Fast, private, easy image compression
0 Upload
Files stay in your browser
Wasm
Client-side codec pipeline
Multi
Batch compression flow
FastAiZip
Browser-native image compression
JPGPNGWebP
01
Built for screenshots, blog assets, and product visuals
02
Keep original format by default, or switch to WebP
03
Designed like a modern SaaS utility, not a plain upload form
Core Tool
FastAiZip Studio
Wasm codecs enabled (jSquash)
JPG
PNG
WebP
When you keep the original format, PNG files and screenshots often have limited room for size reduction. Switch to WebP for higher savings.
Queue
0Files you import will appear here before compression starts.
Why FastAiZip
Why people choose FastAiZip
01
100% local
Files stay in the browser with no upload flow.
02
Wasm pipeline
Compression happens client-side for smoother batch work.
03
Usable defaults
Smart presets plus manual control for advanced users.
04
Cross-device
Works cleanly on desktop and mobile without signup.
Workflow
How it works
- 01
Upload images
Drag files in or click to pick a batch.
- 02
Choose your strategy
Keep the original format or switch to WebP for stronger savings.
- 03
Download results
Export each processed image and move on quickly.
Formats
Supported formats
Supported
JPG / JPEG
Great for photos, article covers, and product shots with softer detail.
Supported
PNG
Best for screenshots, UI captures, transparent assets, and hard edges.
Supported
WebP
Smaller modern output for the web when you want stronger savings.
Privacy
Privacy first
Your images are processed in your browser with no upload and no server storage. This promise is core to FastAiZip.
Browser-only processing
No upload pipeline
No server storage
FAQ
Frequently asked questions
Which formats are supported?
Phase one supports JPG, PNG, and WebP.
Does it work on mobile?
Yes, mobile and tablet browsers are supported.