About

Built for people who
care about their files

No server. No account. No nonsense.

What is Compressy?

Compressy is a free, browser-native image and video compression tool. It converts images to WebP and videos to WebM (VP9) or MP4 (H.264) directly in your web browser — without uploading a single byte to any server.

Image compression uses the Canvas API, a standard part of every modern browser. Video compression is powered by FFmpeg WebAssembly, the industry-standard encoding engine compiled to run natively inside your browser tab.

Why browser-native?

The dominant model for web tools is: upload file → server processes → server returns result. That model has a cost. Your files transit the public internet, sit on hardware you do not control, and may be retained in temporary storage under terms you have never agreed to.

Browser-native processing eliminates that cost entirely. Your file never leaves your device. The CPU and memory you are already paying for do the work. The only thing Compressy's servers ever serve is the HTML, CSS, and JavaScript you are reading right now.

Who built this?

Compressy is part of RuntimeHub — an independently built suite of free, privacy-first browser tools. RuntimeHub is made by a solo developer with one guiding belief: useful tools should be free, private, and fast, without requiring an account or asking for your data.

How is it free?

Compressy is supported by unobtrusive display advertising. The ads help cover hosting, domain, and maintenance costs. There are no paywalled features, no file limits, and no premium tier — everything the tool can do is available to everyone, always.

Technical stack

Vanilla JavaScript, HTML, and CSS — no frameworks, no build step. All external libraries are loaded on demand directly by your browser from public CDNs, so nothing is bundled or vendored. The architecture follows the RuntimeHub philosophy:

Contact & feedback

Found a bug or have a suggestion? Reach out via the RuntimeHub contact page.