Files never leave your device.
Every transformation runs in your browser via WebAssembly and the native canvas. There is no server, so there is nothing to leak.
Free Image Compressor
Image Compressor is live
Image tools that respect your privacy.
Compress, resize, convert, and optimize images entirely in your browser. No uploads. No tracking. No compromise.
Drop your images here
or · ·
- JPG
- PNG
- WebP
- AVIF
- GIF
- SVG
- 100% local No uploads
- WASM speed <1s per image
- Unlimited No sign-up
Why ToolBox Image
Privacy isn't a feature. It's the architecture.
Most "free" image tools earn their keep by uploading your files, training on them, or showing you ads. We earn it by being the fastest, cleanest, most private tool on the web.
No sign-up. No accounts.
Open the page and start compressing. We do not collect email addresses, do not fingerprint your device, and do not run third-party analytics.
Open formats. Honest output.
We process the same standards your tools already speak — JPG, PNG, WebP, AVIF, GIF, SVG — and tell you exactly what we did.
Features
Everything you need. Nothing you don't.
A focused toolkit that does the boring stuff brilliantly and gets out of your way.
Drag & drop.
Drop a folder of 500 photos. We will handle the queue.
Paste from clipboard.
Screenshot, ⌘V, done. No intermediate file.
Batch processing.
Process hundreds of images in parallel on web workers.
Format conversion.
JPG → WebP, PNG → AVIF — pick any source, any target.
Quality controls.
Fine-tune quality, target size, or visual parity per image.
Side-by-side preview.
Compare before and after at full resolution before you download.
How it works
Four steps. Zero servers.
A workflow designed to disappear into your day. No friction, no learning curve, no fine print.
- 01
Drop or paste.
Drop a file, click to browse, or paste from your clipboard. Anything image-shaped works.
- 02
Pick a target.
Choose a quality level, target size, or output format. Smart defaults handle the rest.
- 03
Compare side-by-side.
Drag the divider. If the result looks right, download. If not, dial it in and try again.
- 04
Download or batch save.
Grab individual files or save everything as a zip. Nothing was ever uploaded.
See it
Drag the divider.
1.8 MB down to 312 KB. Visually identical at normal viewing distances. The Compressor picks the right codec per image — JPEG, WebP, or AVIF — to maximize quality at your target size.
- −82% Avg. file size
- <1s Per image
- 6 Formats
Coming next
One toolkit. Many tools.
Image Compressor is the first of many. Every tool follows the same rules: privacy-first, browser-native, no sign-up.
Pixel-perfect resize with smart cropping and aspect-ratio lock.
Convert between JPG, PNG, WebP, AVIF with one click.
Drag-to-crop with safe-area guides for social platforms.
Tile or corner watermarks with opacity, scale, and rotation controls.
One-click subject isolation. WebGPU-accelerated.
Strip metadata before sharing — keep the pixels, lose the trail.
FAQ
Frequently asked.
Quick answers to the questions we get most. If yours isn't here, the privacy page has the long version.
-
Are my images uploaded to a server?
No. Every step — decoding, resizing, recompressing, encoding — runs in your browser using WebAssembly and the native canvas. Your images never touch our servers, our CDN, or any third party.
-
What file formats are supported?
JPG, PNG, WebP, GIF, AVIF, and SVG. Output can be any of those as well, so you can convert between formats in the same pass.
-
How does the compression work?
We re-encode your images using modern codecs (mozJPEG, libwebp, libaom-avif) compiled to WebAssembly. You choose a target quality, target size, or "lossless" — and we pick the right encoder settings to hit it.
-
Is there a file size limit?
No hard limit on the server (there is no server). The practical limit is your device's available memory — most browsers handle 4K photos without breaking a sweat, and hundreds of small images can be batched in parallel.
-
Will the quality actually suffer?
At smart defaults, the visual difference is imperceptible at normal viewing distances — but the file is dramatically smaller. Drag the before/after slider on this page to see for yourself.
-
Do I need to create an account?
No. There is no sign-up, no email, no subscription. ToolBox Image is free and unlimited, supported by optional donations and the occasional gentle nudge.
Ready when you are
Compress your first image in under five seconds.
Free. Unlimited. No sign-up. Your files stay on your device.