Test regular expressions with real-time string match highlighting.
Toolhammer's Regex Tester & Debugger is a free, client-side online browser tool that processes your files and data 100% locally. It requires zero server uploads, no software installation, and no account registration, offering instant speed and complete privacy.
Choose your file or paste your text directly into the secure browser input area.
Adjust settings, formats, or preferences as needed for your task.
Click process to instantly view, copy, or download your output file with 0ms latency.
Toolhammer's Regex Tester & Debugger operates 100% client-side inside your browser. No files or data are uploaded to external servers, providing full privacy, lightning speed, and zero cost forever.
By processing data locally on your computer or phone, you retain complete privacy and eliminate network upload delays.
Everything you need to know about using Regex Tester & Debugger online.