I Built 58 Free Browser Tools With Zero Backend — Here's the Full Stack

Short summary

ToolKnit is a collection of 58 free browser-based tools that run entirely on your device using WebAssembly and native browser APIs, with no backend server or file uploads. The author explains the full technical stack: pdf-lib for PDFs, FFmpeg.wasm for video, Canvas API for images, Tesseract.js for OCR, plus vanilla JavaScript with zero npm dependencies. Privacy-first architecture ensures your data never leaves your machine—only page-view analytics transmit anything to external services.

• •58 free tools (PDF, image, video, audio converters, calculators, timers, games) run entirely in your browser
• •No backend, no file uploads, no accounts—zero privacy concerns, all processing happens client-side
• •Technical deep-dive with code examples: WebAssembly libraries, browser APIs, architecture trade-offs, and implementation decisions

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