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Online Developer Utility

Regex Tester

Write a pattern, test against text, see matches and groups instantly — with common presets.

100% Browser-Based — code never uploads to our servers. All processing runs locally in your browser.

Tool Options

Results

Results will appear here…

How It Works

Fast developer utilities that run entirely in your browser.

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Paste or upload

Paste code/data or upload a file. Use Import Example to try instantly. Nothing is uploaded to our servers.

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Process in browser

All parsing and conversion runs locally in your browser — 100% client-side.

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Copy or download

Export results as TXT, JSON, CSV, or JS instantly.

Zero server upload — your data stays on your device.

About Regex Tester

Test regular expressions with live highlight, capture groups and presets for email, URL, phone, IP, date and more. Free browser tool. Built for developers, QA and SEO workflows with sample data, copy and multi-format export.

FAQs

No. All developer tools process your content in the browser. FreeConverter servers never receive your input.

Yes. FreeConverter.app online JS/JSON tools are free to use.

No account or installation is required.