Regex Tester
Free • No signup • Runs in your browser
Test regular expressions with live match highlighting.
100% Private
Files are processed locally in your browser and never uploaded to a server.
Instant Results
No queues, no waiting — get your output the moment you click.
No Signup
Free to use with no account, no email, and no watermarks.
Works Everywhere
Runs on any modern device — desktop, tablet, or mobile.
What is Regex Tester?
Regex Tester is a free, browser-based developer tool that test regular expressions with live match highlighting. Everything runs in your browser, so your files are processed on your device, not on our servers.
How it works
Upload your file or data by dragging and dropping or browsing your files.
Adjust the available settings to your preference and preview changes in real time.
Click the process button to run the tool.
Download or copy your result instantly — no waiting, no email required.
Perfect for
- Test regular expressions with live match highlighting
- Formatting and validating code or data structures
- Generating tokens, hashes, and unique identifiers
- Converting between data formats for APIs and configs
Why use it
- 100% browser-based — your files are processed on your device
- Free, with no signup or account required
- Instant results with no processing queues
- Works on any device — desktop, tablet, or mobile
- No watermarks on your output
Frequently asked questions
Is Regex Tester free?
Yes, Regex Tester is free to use, with no hidden fees.
Is Regex Tester safe to use?
Yes. Regex Tester runs in your browser, so your files are processed on your device, not on our servers.
Do I need to install anything to use Regex Tester?
No. Regex Tester is a web-based tool that works in any modern browser — Chrome, Firefox, Safari, or Edge. Just open the page and start using it.
How does Regex Tester work?
Regex Tester is a developer tool that test regular expressions with live match highlighting. Add your file, adjust the available settings, and get your result right away, all processed in your browser.
Does Regex Tester work on mobile?
Yes. Regex Tester is fully responsive and works on desktops, tablets, and mobile phones. The interface adapts to your screen size automatically.
Are there any limits when using Regex Tester?
Regex Tester has no daily usage caps and adds no watermarks. Because it runs on your device, very large files depend on your device's memory.
Ready to use Regex Tester?
Free, instant, and runs entirely in your browser. No download, no signup, no limits.
Takes less than 10 seconds