Sral (ស្រាល) means light in Khmer
Compress PDFs and images locally in your browser
No uploads • No accounts • No limits • 100% private
Glassmorphism UI • Animated gradients • Before/After preview slider • Smart compression suggestions
Most online compressors:
- ❌ Upload your private files to someone else's server
- ❌ Have file-size limits (usually 10-50 MB max)
- ❌ Require signup, show ads, or throttle you
- ❌ Charge for bulk processing
Sralify:
- ✅ 100% client-side — files never leave your device
- ✅ No limits — compress 1 GB+ of files if you want
- ✅ Zero tracking — no analytics, no cookies, no surveillance
- ✅ Free forever — MIT-licensed, open-source
- ✅ Works offline — installable PWA with full offline support
- ✅ Smart AI suggestions — analyzes your images and suggests the best preset
- 🗂️ Universal drop zone — PDFs + images (JPG/PNG/WebP) auto-detected
- 📚 Batch mode — drop dozens of files at once, compress all
- 🎚️ Presets + manual control — Low/Recommended/Extreme presets, or fine-tune scale/quality/format
- 🖼️ Image conversion — export as WebP (smallest), JPEG, PNG (lossless), or keep original
- 📐 Smart resize — cap longest edge (800px–1920px) without distortion
- 🔮 Glassmorphism UI — frosted-glass cards with backdrop blur + animated gradients
- ⚖️ Before/After slider — drag to compare original vs compressed quality before downloading
- 🧠 AI-powered suggestions — analyzes pixel data and suggests optimal preset per file
- 🎨 Zero-dependency image processing — pure Canvas API, no heavy libraries
- 📊 Live savings tracker — see total MB saved + percent reduction per file
- 📣 Shareable stat cards — generate a PNG showing your savings
- 🔄 Re-compress without re-upload — tweak settings and reprocess without dropping files again
- 💾 Download all as ZIP — auto-bundles compressed files
- 📲 Installable PWA — add to home screen, works fully offline
- 🌗 Dark mode — follows OS preference
- 🌐 Bilingual — English + Khmer (ខ្មែរ) UI
Uses PDF.js to render each page to a canvas, then jsPDF to rebuild a new PDF with JPEG-encoded pages.
Best for: Scanned documents, image-heavy PDFs (60–90% size reduction typical)
Trade-off: Text becomes images (no longer selectable)
Tip: Use Low preset if you need maximum quality/sharpness
Re-encodes using the browser's native Canvas API — no library overhead (zero extra KB downloaded).
Best for: Photos, screenshots, graphics
Options: Convert to WebP (smallest), resize, adjust quality
Lossless mode: PNG output ignores quality slider
Just visit sralify.app — no installation needed.
One-click deploy to your own domain (free hosting):
| Platform | Deploy |
|---|---|
| Vercel | |
| Netlify |  |
| Cloudflare Pages | Deploy now |
| GitHub Pages | Just fork this repo, enable Pages in Settings → Pages |
Or host the static files anywhere — S3, your own server — no backend required.
No build step needed — just open index.html or serve locally:
# Python
python3 -m http.server 8000
# Node.js
npx serve .
# Any static server worksThen visit http://localhost:8000
Sralify/
├── index.html # Main UI (semantic HTML, no framework)
├── manifest.json # PWA manifest (installable app)
├── sw.js # Service worker (offline support)
│
├── css/
│ └── sral.css # Complete styles (~7KB gzipped, no Tailwind!)
│
├── js/ # Pure ES modules, zero dependencies
│ ├── app.js # Main logic (state, UI, queue management)
│ ├── i18n.js # Translations (EN/KM)
│ ├── lazy-loader.js # On-demand CDN library loading
│ ├── pdf-compressor.js # PDF pipeline (PDF.js + jsPDF)
│ ├── image-compressor.js # Canvas-based image compression
│ └── share-card.js # PNG stat card generator
│
├── locales/
│ ├── en.json # English translations
│ └── km.json # Khmer (ខ្មែរ) translations
│
├── assets/
│ ├── favicon.svg # Modern SVG favicon
│ ├── favicon-{16,32,192,512}.png
│ ├── apple-touch-icon.png
│ ├── screenshot.png # Light mode preview
│ └── screenshot-dark.png # Dark mode preview
│
├── build/
│ └── gen-favicon.js # PNG favicon generator (run: node build/gen-favicon.js)
│
├── README.md # You are here
├── LICENSE # MIT
├── ACKNOWLEDGEMENTS.md # Open-source credits
├── package.json # Minimal metadata (no build step)
└── vercel.json # Static deploy config
- Zero framework — Vanilla JS modules, semantic HTML, hand-crafted CSS
- No build step — Ships raw ES modules, no bundler required
- Lazy-loaded CDN libraries — PDF.js/jsPDF/JSZip only load when actually needed
- CSS variables for theming — Dark mode is a single class toggle
- localStorage for persistence — Settings + language preference survive refreshes
Works in any modern browser (Chrome, Firefox, Safari, Edge — last 2 versions).
Note: Large PDFs (100+ pages) are memory-intensive — desktop recommended for heavy workloads.
Edit css/sral.css:
:root {
--rose-500: #f43f5e; /* Primary brand color */
--emerald-500: #10b981; /* Success/savings color */
/* ... */
}- Create
locales/xx.jsonwith translations (copyen.jsonas template) - Add language toggle in
js/app.js(search for'km'to see pattern) - Update
<html lang="...">attribute inindex.html
node build/gen-favicon.jsThis generates all sizes from the script (no Photoshop needed).
PRs welcome! Ideas:
- "Keep text selectable" mode — use
pdf-libto recompress embedded images without rasterizing pages - Office document support — docx/pptx/xlsx are just ZIP containers; extract and recompress images inside
- Drag-to-reorder queue — rearrange files before compressing
- WebAssembly Ghostscript — true PDF-level optimization
- AVIF output — even smaller than WebP for images
- History/undo — store last 10 files in IndexedDB for recovery
- Shareable links (P2P) — WebRTC data channels for direct browser-to-browser file transfer
- Fork this repo
- Make changes (HTML/CSS/JS — no build needed!)
- Test locally:
npx serve . - Submit PR
I got tired of:
- Uploading private documents to random compressor sites
- Hitting "5 MB max" file-size walls
- Seeing ads or being asked to sign up
- Worrying about what happens to my files after upload
So I built Sralify — a tool I'd actually trust with my own files. If it's useful to you too, that's awesome. Star the repo, share it, fork it, whatever. It's free and always will be.
MIT © 2026 im4tta
You can use this code for anything — personal, commercial, educational. Attribution appreciated but not required.
This project stands on the shoulders of open-source giants:
See ACKNOWLEDGEMENTS.md for the full list.
Made with ❤️ for privacy-conscious humans