Free online tools for PDFs, images, calculators, text and code. Private by default, in your browser.
No signup, and your files never leave your device. 100% private by default — all 108 utilities process in your browser, with external network and runtime tools clearly labeled.
Popular
The most frequently used formatters, encoders, and debuggers.
Everyday Utilities
PDFs, images, calculators, text formatting, and daily helpers that process locally in your browser.
Developer & Code Utilities
Offline-first utilities for JSON, security, databases, APIs, code conversion, and web design.
Privacy by design
Most utilities run entirely in browser memory. Network tools that query external servers (such as DNS Lookup and API Tester) are labeled explicitly. Your inputs and keys are not stored or uploaded to Mango servers.
Local execution
Input never leaves your tab for offline utilities
Formatters, generators, hashers, and encoders execute locally using browser APIs like Web Crypto, Canvas, and WebAssembly. No tool inputs, tokens, or uploaded files are sent to Mango servers.
Inspect DevTools > Network tab. Formatting JSON or generating keys emits zero network requests. Local tool data stays in memory.
Zero server latency
Instant response on megabyte payloads
Because data stays local, calculations and formatting are instantaneous without network round trips or queuing.
Works offline
Service Worker caches utilities for offline use
Local utilities run without an active internet connection once loaded. Network-dependent tools are clearly labeled.
Network tools transparency: Tools like DNS Lookup, SSL Checker, and API Request Tester make browser-initiated requests to your requested endpoints. Tools like Python Runner download a WebAssembly runtime on first launch.
Frequently asked questions
Details on privacy, offline capabilities, and data handling.