Your tools. Your data. Entirely local.
Astrum Toolbox processes images, PDFs, EPUBs, and code utility operations directly in your browser. None of your sensitive data ever leaves your device.
Architected for Absolute Privacy
Conventional tools process your data on remote servers. We compile desktop-grade utilities directly into web sandboxes.
100% Private by Design
Inputs, documents, and files are processed inside your browser's temporary memory. No API uploads, no leaks, absolute security.
WebAssembly Performance
Intensive processes like image recompression (JSquash), PDF page extraction, and EPUB optimization run at native speed via compiled WASM.
Zero Server Dependencies
No remote APIs, server queues, or backend workloads. Your device handles 100% of the computation directly in the browser tab.
No Accounts or Cookies
Free from sign-up friction, subscriptions, and trackers. Instant developer-first utilities whenever you need them.
Designed for Desktop-Grade Workflows
Clean modules designed for daily file adjustments, format encoding, and tokenizer tests.
Text Tools
Fast in-browser utilities for string conversions, hashing, JWT token inspection, and text sanitation.
Image Tools
Client-side image encoders, generators, and compressors utilizing compiled WASM codecs.
Document Tools
Process sensitive presentations, books, and reports directly in your browser session.
AI Tools
Run client-side model analysis tools and token distribution previews locally.
Execution Model
By leveraging browser sandbox environments, we bypass server-side backends entirely.
User Interface
A responsive and intuitive visual interface for controlling all tools directly in the browser.
Web Worker Concurrency
Offloads heavy computations to browser background threads to keep the interface responsive when processing files.
WebAssembly Local Engines
Runs compiled low-level modules and browser APIs directly on your CPU to handle intensive media codecs and document utilities.
Frequently Asked Questions
Get answers to common technical questions about browser-first processing.