Regex Tester Online: Build, Test, and Debug Regular Expressions
Learn how to build and debug regular expressions with live highlights, flags, and real-world examples.
Fast, free, and private. No signup required.
All processing happens in your browser.
Test and debug regular expressions with live highlighting
Format, validate, and beautify JSON data
Build cron expressions with visual editor
Encode and decode Base64 strings and files
Encode and decode URLs and query strings
Decode and inspect JSON Web Tokens
Generate random UUIDs and validate existing ones
Generate MD5, SHA-1, SHA-256, SHA-512 hashes
Convert Unix timestamps to readable dates
Compare two texts and highlight the differences
Convert between HEX, RGB, HSL, and CMYK
Write and preview Markdown in real-time
Encode and decode HTML entities
Generate placeholder text for designs
Convert between YAML and JSON formats
Format and beautify SQL queries
Format and validate XML documents
Practical guides and workflows for your daily developer tasks.
Learn how to build and debug regular expressions with live highlights, flags, and real-world examples.
Validate JSON, fix formatting issues, and produce clean output with consistent indentation.
Create cron schedules with a visual builder and export to common formats like AWS and GitHub Actions.
Encode or decode Base64 strings, files, and images directly in your browser.
Encode special characters for URLs, decode parameters, and build safe query strings.
Decode JWT headers and payloads, inspect claims, and verify expiration quickly.
Jump directly to related tools for data formats, encoding, text workflows, and more.
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Your data never leaves your browser.
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