About ToolRunner
ToolRunner is a free collection of developer utilities designed to run entirely in your browser. Every tool processes data locally — nothing is ever uploaded, stored, or transmitted to a remote server.
Our Mission
Developers frequently need quick utilities — formatting JSON, decoding a JWT, testing a regex, or converting between data formats. Most online tools require pasting sensitive data into forms that send it to unknown servers. That is a privacy risk, especially when working with API keys, configuration secrets, or proprietary data.
ToolRunner exists to solve this problem. We believe developer tools should be fast, free, and private by default. Every tool on ToolRunner runs client-side using JavaScript and WebAssembly, giving you native-like performance with zero network latency and complete data privacy.
Core Principles
Privacy First
Your data never leaves your device. We do not collect, transmit, or store any data you process with our tools.
Instant Performance
Zero network round-trips. Processing happens in your browser tab, delivering results as fast as native applications.
Always Free
No sign-ups, no premium tiers, no usage limits. Every tool is free to use without restrictions.
Developer-Centric
Dark mode, keyboard shortcuts, responsive layouts, and clean interfaces — built by developers, for developers.
How It Works
When you open any ToolRunner page, all the code needed to run that tool is downloaded to your browser. From that point on, everything happens locally:
You paste, type, or upload your data into the tool interface.
JavaScript or WebAssembly processes the data entirely within your browser tab.
The result is displayed instantly — no waiting for server responses, no data transmitted anywhere.
Technology Stack
ToolRunner is built with modern web technologies to ensure fast load times and reliable performance:
Frequently Asked Questions
- Who built ToolRunner?
- ToolRunner is built and maintained by independent developers who are passionate about creating privacy-first, browser-based tools for the developer community.
- How does ToolRunner make money?
- ToolRunner is supported by non-intrusive advertising through Google AdSense. All tools remain completely free with no premium tiers or hidden costs.
- Can I request a new tool?
- Yes! We are always looking to expand our tool collection. Send your suggestions to toolrunnerdev@gmail.com.
- Does ToolRunner work offline?
- Yes. Once the page has loaded, most tools continue to work without an internet connection because all processing happens client-side in your browser.