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Tool Category Map

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Count words, chars, reading time

UPPER, lower, camelCase & more

Lorem Ipsum Generator

Generate placeholder text

Flip text chars or words

Beautify & validate JSON

Encode or decode Base64

Encode/decode URL strings

Escape HTML entities

Test regex patterns live

MD5, SHA-256, SHA-512

Color Converter

HEX, RGB, HSL, CMYK

CSS Gradient Maker

Build gradients visually

Password Generator

Cryptographically strong

Length, weight, temp, speed

Exact age in years/days

Body mass index checker

Random Number Gen

Generate random numbers

Meta Tag Generator

OG, Twitter, SEO tags

Timestamp Converter

Unix ↔ readable date

Decode JWT header & payload

Random UUID v4 in bulk

Compare two texts line by line

SEO-friendly URL slugs

Latest practical guides

Short explainers for the problems people search before opening a tool.

All guides →

Text Title Case vs Sentence Case Know which style to use in headings, buttons, filenames and code. Developer URL Encoding Query Parameters Fix broken links with spaces, ampersands, hashes and Unicode. Math Unit Conversion Formulas Convert metric, imperial, temperature and speed without guessing. Health BMI Formula Metric and Imperial Calculate adult BMI and understand why it is only a screening number. Finance Loan Payment Formula Estimate monthly payment, total interest and full repayment cost. Developer Convert JSON to CSV Prepare JSON arrays for Excel, Google Sheets and database imports.

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Free Online Tools for Developers & Productivity

ToolZone is a curated collection of 28 free online tools for developers, designers, writers, and everyday productivity. Every tool runs entirely in your browser — no signup, no uploads. Your tool input never leaves your device.

Format and validate JSON, generate strong passwords, encode and decode Base64 or URLs, test regular expressions, convert colors, build CSS gradients, calculate BMI or age, generate Lorem Ipsum, hash text with MD5 or SHA-256, and more — all from a single fast, private, dark-themed workspace.

Whether you're a developer needing quick utilities, a designer working with colors and gradients, or a writer counting words and characters, ToolZone gives you instant, low-clutter access to professional-grade web tools that work offline once loaded.

Free Regex Tester — Live Match Highlighting

Build and debug JavaScript regular expressions with real-time feedback. Type your pattern, set flags (global, case-insensitive, multiline, dotAll, unicode), paste sample text and see every match highlighted instantly with a count.

Features

Live match highlighting as you type
Full flag support: g, i, m, s, u
Match count and helpful error messages
Safely escapes output so HTML in your sample text can't break the page

How to use

Step 1. Enter your regex pattern (without surrounding slashes).
Step 2. Add flags if needed (g, i, m, s, u).
Step 3. Paste sample text — matches highlight automatically.

Real use case: validating invoice numbers before they hit the database

A finance app must accept invoice references like INV-2026-00184 and reject everything else. The developer drafts ^INV-\d{4}-\d{5}$, but the QA team keeps finding accepted values that should fail, such as a reference with a trailing space.

Pasting twenty real references — good and bad — into the tester and watching which ones highlight makes the flaw obvious in seconds: the pattern was being used with .test() on an untrimmed string. The developer fixes the input handling and keeps the sample set as the basis for unit tests.

How Regex Tester works

Your pattern is compiled with the browser's native RegExp engine using the flags you select (g, i, m, s, u), so behaviour matches exactly what your JavaScript will do in production — no server-side dialect differences.

Matching iterates the subject text and records every match plus its capture groups and index. The highlighter escapes the text before inserting markers, so a match containing < or & is displayed safely and never injected as HTML.

Invalid patterns surface the engine's own SyntaxError, and zero-length matches are advanced deliberately to avoid the infinite loop that a naive global-match loop hits on patterns like a*.

Regex Tester vs similar tools

Regex testers compared:

Tool	How it works	Trade-off
Desktop/IDE find-and-replace	Regex search across files.	Different flavours (PCRE, .NET) mean a pattern that works there may fail in JavaScript.
grep / ripgrep	Regex over files in the terminal.	POSIX or Rust regex syntax — no lookbehind in some builds, no JS semantics.
ToolZone Regex Tester	Native JavaScript RegExp with live highlighting, groups and flag toggles.	Tests one pattern against pasted text, not across a codebase.

Frequently Asked Questions

Which regex flavour does it support?

JavaScript's native RegExp engine, so anything that works in Node.js or the browser works here. Lookbehinds and named groups are supported in modern browsers.

Why is my pattern slow?

Catastrophic backtracking, usually from nested quantifiers like (a+)+. Refactor with atomic patterns or possessive quantifier equivalents.

Related Developer tools

Guides worth reading

Browse all ToolZone guides →