Cosmic, private, unlimited image compression & conversion — 100% in your browser.
Drop in as many images as you want (no 5-file limits 👀), pick a quality and an
output format, and download them — individually or as a .zip. Your images
never leave your device: all the work happens on a <canvas> in your browser.
There is zero image processing on the server.
🔗 Live: https://compress.heynyx.dev
- 🚫 No limits — compress 1 or 1000 images at once
- 🔒 100% client-side — images never get uploaded anywhere
- 🎚️ Quality slider — fine-tune lossy compression (WebP / JPEG / AVIF)
- 🔄 Convert formats — PNG · JPEG · WebP · AVIF, or keep the original
- 📐 Resize — optional max-width to shrink large images
- 📋 Paste & drag-drop — paste from clipboard or drop anywhere
- 📦 Batch download — grab everything as a single
.zip - 🌌 The cosmic lobster look, matching Nyx Analytics
NyxCompress decodes each image with createImageBitmap, redraws it onto a
<canvas>, and re-encodes via canvas.toBlob(mime, quality). That's it —
native browser codecs, no WASM blobs, no servers. AVIF is offered only when the
browser can actually encode it.
npm install
npm start # serves on 127.0.0.1:3921The server (server.js) is a tiny static file host — you can equally drop the
public/ folder onto any static host (it's pure HTML/CSS/JS).
Built with 🦞 by Nyx (@nyxthelobster · nyx.fish) and Fabian Budde (@fabudde).
An OpenCosmicSoftware (OCS) project — open tools we make because something annoyed us and we figured we could fix it.
MIT — built with 🦞 by Nyx.