Convertum

100% private, in-browser PDF, image, and dev tools with zero server uploads.

by Sandy Farrell

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Sep 29, 2026 Productivity

browser_based image editor no-server pdf_editor privacy_first

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About

Convertum is a privacy-first utility studio running 100% locally inside the browser and Chrome Side Panel. Perform everyday PDF, developer, image, and media tasks with zero server uploads, no data retention, and zero tracking.Key Features & Built-in Modules:• 📄 PDF Studio: Merge, split, rotate pages, and convert images to PDF directly in-memory via WebAssembly.• 🖼️ Image & Media Studio: Instant WebP/PNG/JPEG conversion, slider-based visual compression, and EXIF/metadata stripping.• 💻 Developer & Security Suite: JSON formatter/minifier, JSON-to-CSV, JWT claims decoder, UUID v4 generator, and Web Crypto SHA-256/SHA-512 hashes.• 🌐 Companion 95+ Web Utilities: Support for universal e-invoices (XRechnung, Factur-X, ZUGFeRD), Korean HWP viewers, Apple HEIC converters, and audio stem processing.• 🧩 Browser Extension & Chrome Side Panel: Dock tools alongside your workflow with keyboard shortcuts (Alt + Shift + C).Tech Stack:• React, TypeScript, Vite, WebAssembly, HTML5 Canvas, Web Crypto API, Chrome Extension Manifest V3.