How it works
How to use Regex Tester online
- Choose the file or files requested by the tool.
- Adjust any available settings for the output you want.
- Run the tool in your browser and download the finished result.
Text tool
Regex Tester
Run a JavaScript regular expression and export matches as JSON.
Add your input
Your file stays in this browser.
Good to know1 file · 25 MB max
Upload a text, Markdown, HTML, CSS, or JavaScript file or paste textResult: JSON files
- Your text stays in this browser while the tool runs.
- Text previews are capped for responsiveness when output is large.
Overview
Regex Tester for private browser work
Run a JavaScript regular expression and export matches as JSON. This page keeps the input, output, browser requirements, and practical limits visible before you run the tool, so you can choose the right workflow for the file.
Input
Upload a text, Markdown, HTML, CSS, or JavaScript file or paste text
Output
JSON files
Limits
1 file · 25 MB max
Best for
Regex Tester use cases
- Turn upload a text, markdown, html, css, or javascript file or paste text into json files without creating an account.
- Run a quick regex tester job before sharing, archiving, or publishing a file.
- Check the 1 file · 25 mb max guidance before using larger or unusual inputs.
Processing
What happens in your browser
PrivConvert uses RegExp for this workflow. 2 adjustable settings. No special browser capability is required for typical inputs
Your text stays in this browser while the tool runs.
Related tools
Keep working with this file
FAQ
Regex Tester questions
Is Regex Tester free to use?
Yes. This tool is free to use in your browser and does not require an account.
Are my files private?
PrivConvert is designed for local-first processing. Files are handled in your browser when supported and are not uploaded for account-based storage.
Why might a file fail to process?
Your text stays in this browser while the tool runs.