We recently launched FileHubTools, a suite of 130+ free tools for resizing photos, compressing PDFs, and formatting documents — all running entirely in the browser.
The Problem
Indian government exam portals (SSC, UPSC, NEET) have strict photo upload requirements:
- Exact pixel dimensions (e.g., 100×120px for SSC)
- Strict file size limits (e.g., 20-50KB)
- Specific formats (JPG only)
Students typically use random online tools that upload sensitive documents (Aadhaar, PAN) to unknown servers.
Our Approach
We built everything to run client-side:
- Image processing: Canvas API + quality binary search for exact KB targeting
- PDF manipulation: WebAssembly-compiled pdf-lib
- Zero network requests: Files never leave the device
How the KB Compression Works
Most tools just reduce quality until the file is small enough. We use a binary search algorithm:
- Set quality range: 0.1 to 1.0
- Compress at midpoint quality
- Check resulting size vs target KB
- Narrow range and repeat
- Stop when within 1KB of target
This gives exact results like "49.8KB for a 50KB target" without destroying image quality.
Architecture
- Framework: Next.js 15 with App Router
- Rendering: Server-rendered SEO content + client-side tool logic
- PDF Engine: pdf-lib compiled to WebAssembly
- Image Processing: Native Canvas API
- 15 exam presets: Auto-configured dimensions & size limits
Tools We Built
| Category | Count | Examples |
|---|---|---|
| Photo | 40+ | Resize to KB, crop, rotate, background change |
| 15+ | Compress, merge, split, watermark, protect | |
| Signature | 6 | Draw, crop, clean BG, resize, enhance |
| Calculators | 20+ | EMI, SIP, BMI, age calculator |
| Converters | 15+ | HEIC→JPG, WebP→JPG, PDF→Image |
Privacy First
Every tool runs 100% in the browser. We don't even have a file upload endpoint on our server. When a user processes their Aadhaar card photo, it never touches the network.
Check it out at filehubtools.com — feedback welcome!
Top comments (0)