Fast, private image conversion in a wingbeat. Edit, resize, rotate, convert to PDF, add watermarks. All in your browser. No sign-up. Works offline.

A privacy-first, client-side image processing PWA. Every byte stays on your device — no upload, no account, no cookie, no analytics. Install it to your home screen and it works offline.

🌐 Live (English): colibrious.com 🌐 Live (suomeksi): kuvankäsittely.fi

Both sites are served from the same dist/. Locale is chosen from the request hostname (*.fi → fi, *.com → en, override with ?lang=fi|en).

• Resize — exact dimensions, percent, or fit-longest-side, batch + per-image
• Crop — free-form or 1:1, 4:3, 16:9, 3:2 aspect ratios
• Rotate · Flip — horizontal and vertical
• Format conversion — PNG, JPEG, WebP, with quality control
• PDF export — combine all images into one multi-page A4 PDF (client-side via pdf-lib, lazy-loaded)
• Filters — brightness, grayscale, sepia
• Watermarks — custom text overlay
• Batch processing — apply settings to many images at once
• Installable PWA — works fully offline after first load
• Whole-window drop — drop images anywhere in the tab; no missed drops opening the file in the browser

This app is fundamentally not a service. There is no backend.

• Images are decoded, processed, and re-encoded entirely in the browser via Canvas / OffscreenCanvas.
• No file ever leaves the device.
• No cookies. No localStorage. No analytics. No tracking pixels.
• No third-party requests beyond what the browser fetches to load the static bundle.

The source is open under MIT — verify it yourself.

React 19 · TypeScript · Vite · Tailwind CSS v4 · Framer Motion · vite-plugin-pwa · pdf-lib

• All user-facing strings live in src/i18n/strings.ts keyed by locale.
• src/i18n/useStrings.ts detects the locale from window.location.hostname (with a ?lang= override for testing).
• vite build emits the English index.html + manifest.webmanifest as the canonical (Colibrious) build.
• scripts/post-build.mjs then writes Finnish companions:
  • dist/index.fi.html — Finnish <title>, OG, Twitter, canonical
  • dist/manifest.fi.webmanifest — Finnish PWA manifest (so the installed-app name reads correctly)
• nginx for kuvankäsittely.fi rewrites / → /index.fi.html and /manifest.webmanifest → /manifest.fi.webmanifest. nginx for colibrious.com serves the defaults as-is.

npm install
npm run dev # http://localhost:5173 (default English)
npm run dev # http://localhost:5173/?lang=fi (Finnish override)
npm run build # production build → dist/ (incl. .fi companion files)
npm run preview # preview the built bundle
npm run lint

Source logo is assets/logo.png (outside public/ so the 1.6 MB original isn't shipped). To regenerate all icon sizes:

npx pwa-assets-generator --preset minimal-2023 assets/logo.png

The app is a fully static SPA — drop dist/ on any static host. No environment variables, no secrets, no server-side anything.

For the production setup (haukka, nginx + certbot, Cloudflare):

1. Both colibrious.com and kuvankäsittely.fi (Punycode xn--kuvanksittely-gfb.fi) are served from the same dist/ (typically symlinked from one webroot to the other).
2. The kuvankäsittely.fi server block adds:

   location = / { try_files /index.fi.html =404; }
   location = /manifest.webmanifest { try_files /manifest.fi.webmanifest =404; }

Issues and pull requests are welcome. Keep it minimal — this project deliberately stays small.

MIT © Esa-Pekka Pälvimäki