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CoolTools is an open-source web utilities platform built by an independent developer for programmers, designers, and privacy-conscious users. The platform hosts two distinct types of utilities: Browser-Local Tools that execute computations entirely inside your device memory without server uploads, and Live Public API Tools that retrieve current information directly from official public data providers.
Your files, JSON payloads, tokens, and documents are handled in local browser memory via standard FileReader, Canvas, and WebAssembly APIs. No backend tool-processing API receives or stores your input data.
We utilize standard browser capabilities—including the W3C Web Crypto API for CSPRNG passwords and SHA digests, pdf-lib for document restructuring, and Ghostscript WASM for PDF optimization.
Where applicable, tools implement authoritative specifications such as RFC 8259 (JSON), RFC 7519 (JWT), RFC 4122 (UUIDv4), RFC 3986 (URI), and Unicode 15.0 guidelines.
We encourage users to verify all network activity using browser Developer Tools (F12) to confirm that no input data leaves their machine during tool usage.
You paste text or select a file locally on your device.
Data is read into JavaScript memory using HTML5 FileReader / ArrayBuffer.
Algorithms run on your CPU via Web APIs or WebAssembly workers.
Outputs are rendered or exported directly to your disk with zero network hops.
CoolTools Platform is designed, maintained, and published by Chinmay Patil. The project was created to provide a modern, transparent alternative to legacy online converter websites that unnecessarily upload confidential documents and tokens to private backend servers.
The source code is hosted publicly on GitHub. You can inspect the implementation of every tool, review changes, submit bug reports, or contribute improvements directly.