Most "free" image tools earn their keep by uploading your files or training on them. We earn it by being the fastest, cleanest tool on the web — everything runs in your browser, your files never leave your device.

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.

No sign-up. No accounts.

Open the page and start compressing. No sign-up, no accounts, no email required.

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

Photo before compression — 125 KB — Before · 125 KB

Same photo after compression — 46 KB, −63% — Before · 125 KB

Coming next

One toolkit. Many tools.

Image Compressor is the first of many. Every tool follows the same rules: browser-native, no sign-up.

Next Image Cropper

Drag-to-crop with safe-area guides for social platforms.

Planned Watermark

Tile or corner watermarks with opacity, scale, and rotation controls.

Planned Background Remover

One-click subject isolation. WebGPU-accelerated.

Planned EXIF Cleaner

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 mode — 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.
Will the quality actually suffer?

At smart defaults, the visual difference is imperceptible at normal viewing distances — but the file is dramatically smaller.
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.

Read the full privacy story

Available in

EN English Now ES Español Soon FR Français Soon DE Deutsch Soon IT Italiano Soon PT Português Soon RU Русский Soon ZH 中文 Soon JA 日本語 Soon KO 한국어 Soon AR العربية Soon HI हिन्दी Soon TR Türkçe Soon

Ready when you are

Compress your first image in under five seconds.

Free. Unlimited. No sign-up. Your files stay on your device.

Open Compressor FAQ