WEB UTILITIES
Free Regex Tester online
Test regular expressions with live matching.
Regex Tester is a free browser tool that lets you test regular expressions with live matching. Paste your text into Regex Tester, tweak the options, and take the result with one click. Regex Tester works on your device only, so no file or text is ever uploaded.
- Free to use
- No signup
- Private and local
- Unlimited use
Why use Regex Tester
- test regular expressions with live matching without installing software
- Your text is processed on your device by Regex Tester, never uploaded
- Regex Tester needs no account, email address or payment details
- Regex Tester shows live output that updates as you type
- Regex Tester is keyboard accessible and screen-reader friendly
- Regex Tester is free forever, with no watermark on the result
Regex Tester runs entirely inside your browser. Your text is never uploaded, stored or shared, and nothing is retained once you close the tab.
How to use Regex Tester
- Enter your text Paste or type your text into the input panel above.
- Adjust the options Set the options that control how Regex Tester handles your input.
- Run the tool Regex Tester works instantly on your device, with no queue and no upload wait.
- Copy or download Copy the output to your clipboard or download it as a file, free and unlimited.
Benefits
Private by design
Your text stays on your device while Regex Tester works. Regex Tester never sends it to a server, so confidential work stays confidential.
Instant results
Regex Tester finishes most jobs in under a second because the work happens on your own hardware.
No signup, no limits
Use Regex Tester as many times as you want. Regex Tester asks for no account, adds no watermark and keeps no paid tier gating the output.
Works on any device
Regex Tester runs in any modern browser on desktop, tablet and phone, with a keyboard-accessible interface throughout.
Who it is for
For students
Students use Regex Tester to hand in coursework without installing software: test regular expressions with live matching on a shared or locked-down machine.
For freelancers
Regex Tester helps freelancers send client deliverables quickly, since your text never leaves the laptop it was created on.
For HR and admin teams
Regex Tester helps HR and admin teams process paperwork quickly, since your text never leaves the laptop it was created on.
How it works
Regex Tester parses your input in the browser and walks its structure to collect the measurements shown on screen. Regex Tester is read-only: the source is held in memory for the session and discarded when you close the tab.
Frequently asked questions
Is Regex Tester free to use?
Yes. Regex Tester is completely free with no account, no trial and no usage cap. Every feature on this page is available on the first visit.
Does Regex Tester upload your text to a server?
No. Regex Tester processes your text inside your browser, so it never reaches a DocTools server. That also means the tool keeps working if your connection drops mid-task.
Is there a limit on how much input I can use?
Regex Tester handles inputs into the megabytes without trouble; the only real limit is how much your browser tab can hold in memory.
Do I need to install anything to use Regex Tester?
No installation is needed. Regex Tester runs in Chrome, Edge, Firefox and Safari, on desktop and on mobile, with no extension or plugin.
Can I use Regex Tester on a phone or tablet?
Yes. The Regex Tester interface adapts to small screens and supports touch input, though very large jobs are faster on a desktop browser.
What happens to your text when I close the tab?
It is discarded. Regex Tester keeps everything in temporary browser memory, so closing the tab removes every trace of the session.
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Last updated: 2026-09-07