When should I use it?
Use Regex Tester when you need a private, upload-free browser tool for this task.
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.
✓ Browser Processing
✓ No Upload
✓ Privacy First
✓ Free Forever
✓ Works Offline
Tool Options
Results
Results will appear here…
FreeConverter.app Guide
What does Regex Tester do?
Test regex with highlights, capture groups and common presets.
Who is it for?
Developers, marketers, students, and anyone who needs a free browser utility.
Example input
Paste text, markup, or choose a local file (processed only in this browser tab).
Example output
Instant on-device result you can copy or download — nothing leaves your device.
Browser processing100% in-browser
PrivacyLocal Processing
UploadNot required
DifficultyEasy
How It Works
Fast developer utilities that run entirely in your browser.
1
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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2
Process in browser
All parsing and conversion runs locally in your browser — 100% client-side.
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3
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.
No. FreeConverter.app processes this tool locally in your browser. Your input is not uploaded to our servers.
No. Regex Tester on FreeConverter.app is free to use without creating an account.
Developers, marketers, students, and anyone who needs a free browser utility.