Convertum — 160+ Free, 100% In-Browser & Private Utilities for Developers & Creators

🚀 What is Convertum? I built Convertum because I was tired of online file converters and developer utility websites that force you to upload sensitive files, wait in slow server queues, or hit hidden paywalls after two conversions. Convertum is an all-in-one suite of 160+ privacy-first web utilities—ranging from document conversion (PDF to Word, Markdown, HWP, OFD) and developer data tooling (JSON to TS/Zod/CSV, JWT validator, Codebase-to-Prompt packager) to in-browser audio engineering (8D spatial audio, speed/pitch shifters, loudness normalizers) and LLM VRAM calculators. 🔒 How it works (The Problem it Solves): Unlike conventional cloud converters, Convertum uses a strict Zero-Trust architecture. Every single tool runs 100% locally in the user's browser memory sandbox. Your files, code snippets, and data payloads never leave your computer or touch an external server. 🛠️ Tech Stack & Architecture: • Frontend: React, TypeScript, Vite, Tailwind CSS / Vanilla CSS • In-Browser Processing: WebAssembly (Wasm), Web Audio API, Web Workers, Canvas API, ONNX Runtime Web • Performance & SEO: Custom static pre-rendering pipeline generating 26,000+ localized static pages across 30 languages with zero duplicate metadata and sub-100ms TTFB • Hosting & CDN: Netlify with edge caching ✨ Key Highlights: - 100% Client-Side Privacy (Zero server uploads) - No artificial quotas, limits, or watermarks - Fully offline capable once loaded - Free forever for the community