A while back I got frustrated with online tools that upload your files to a server, make you sign up, and then quietly keep your data. So I built TRE — a collection of 80+ tools that run entirely in your browser using JavaScript. Your files never leave your device.
Why "zero uploads" actually matters
When you drag a photo into an online image compressor, most tools upload it to their server, compress it there, then send it back. That means a third party now has a copy of your file. For personal photos, business documents, invoices, or anything sensitive — that's a real risk most people don't think about.
With TRE, everything runs client-side. The compression, conversion, PDF merging — all of it happens locally in your browser tab. Nothing touches a server.
What's inside TRE
🖼️ Image Tools (11 tools)
- Image Compressor — reduce file size up to 80% in-browser
- Image Resizer, Cropper, Format Changer
- AI Image Upscaler, Background Remover
- Color Palette Generator, SVG↔PNG Converter
- Favicon Generator, QR Code Generator, Watermark Tool
🎵 Audio Tools
- Audio Compressor, Format Changer, Audio Crop
- Audio Sprite Generator (great for game dev!)
📄 Document Tools
- PDF Compressor, Merger & Splitter
- Word↔PDF Converter, Image to PDF, PDF to Image
- Resume Builder, Invoice Maker
💻 Developer Tools
- JSON Viewer, Base64 Encoder/Decoder
- Code Minifier, JWT Decoder, Meta Tags Generator
- CSS Grid Generator, JS/CSS Beautifier
💰 Finance & Calculators
- EMI Calculator, GST Calculator, SIP Calculator
- Currency Converter, Income Tax Calculator
- Word Counter, BMI Calculator, Unit Converter
🎮 Game Dev Tools
- Bitmap Font Generator, Texture Packer
- Physics Editor, PixiJS Text Style Editor
- Flow Diagram Builder, Multi Device Preview
The tech stack
Vanilla JS with no heavy frameworks — this keeps pages fast and lightweight. A few specialized libraries power specific tools: browser-image-compression for images, pdf-lib for PDF operations, and ffmpeg.wasm for audio/video work (all running in-browser via WebAssembly).
What I learned building this
Crawl budget is real. When I submitted my sitemap with 99 URLs at once, Google's crawl queue backed up and most pages went into "Discovered – currently not indexed." Don't bulk-submit sitemaps — let Google find pages gradually.
Client-side processing has limits. Very large files (100MB+ videos) can freeze the browser tab. I had to implement chunked processing and WebWorkers to handle heavy operations without blocking the UI.
Users care about privacy more than they say. The "zero uploads" messaging drove more word-of-mouth sharing than any feature I built. People share tools they trust.
What's next
I'm working on a video editor, more AI tools, and a browser extension that lets you use TRE tools directly from your right-click menu on any image or file.
Would love feedback from the dev community — what tools are missing? What would make you actually use (and share) a tool like this?
👉 Try TRE free at tre.dev — no account needed.