PDF & audio tools that never leave your device
Merge, trim, and convert PDFs and audio right in your browser. Powered by Web Workers — fast, private, and free.
Six purpose-built utilities
Everything you need
Six powerful tools, all running right in your browser.
Built for you
No compromises. Everything runs locally, securely, and for free.
Privacy first
Files are processed in your browser and never uploaded to a server.
Blazing fast
Web Workers keep the UI responsive while heavy processing runs in the background.
No login required
No accounts, no sign-ups. Just open the tool and go.
Free forever
Every tool is free, with no limits or watermarks.
How it works
Three simple steps — no setup required.
Choose a tool
Pick from our collection of PDF and audio utilities.
Drop your files
Drag and drop or click to select files from your device.
Download the result
Get your processed files instantly — nothing leaves your browser.
Ready to go local?
All tools are free and run in your browser. No uploads, no accounts, no limits.
Love Localbox? Support us.
Free, private, and ad-free — forever. A small donation covers cost of infrastructure and helps make Localbox better in every possible way.