Client-side · Zero uploads · 100% private

Compress images
at machine speed

Drop any image, tweak quality, convert format — all inside your browser.No account. No server. No limits.

Drop images here

or click anywhere to browse · JPG, PNG, WEBP, BMP, AVIF

Built different

Everything runs locally. Nothing hits a server.

Instant Processing

Compression runs entirely in your browser via Web Workers — no server, no wait.

100% Private

Your images never leave your device. Zero uploads, zero tracking.

Multi-format

Convert between JPG, PNG, WEBP, BMP and AVIF with a single click.

Batch & ZIP

Compress hundreds of images at once, download them all as a ZIP.

Unlimited Free

No account, no limits, no hidden fees. Ever.

Custom Resize

Set exact width and height while preserving aspect ratio.

Four steps. Done.

01

Drop Images

Drag and drop or click to select any image files.

02

Configure

Pick format, quality, and optional pixel dimensions.

03

Compress

Hit Convert — processing happens instantly in-browser.

04

Download

Save individually or bundle everything into one ZIP.

FAQ

Is ZynU free?

Yes — completely free, unlimited compressions, no account required.

Are my images uploaded to a server?

No. All processing runs locally in your browser. Your images never leave your device.

Which formats are supported?

Input and output: JPG, JPEG, PNG, WEBP, BMP, AVIF.

Can I compress multiple images?

Yes. Upload as many as you like and download them all as a single ZIP.

Will quality be affected?

You control quality via the slider. Our smart algorithm reduces file size while preserving visual fidelity.