Text processing tools
Count, compare, search, replace, normalize, and transform text for writing and development tasks.
Recommended tools
Word & Character Counter
Count words, characters, lines, and UTF-8 bytes in real time—for essays, blogs, and copy. 100% free, runs locally in your browser—nothing is uploaded to our servers.
Regex Playground
Match, groups, and highlight preview. 100% free, runs locally in your browser—nothing is uploaded to our servers.
Text Diff
Line-level difference between two texts (diff). 100% free, runs locally in your browser—nothing is uploaded to our servers.
Line Cleanup
Sort, deduplicate, remove blank lines, trim each line, reverse line order. 100% free, runs locally in your browser—nothing is uploaded to our servers.
Case & Naming
Upper/lower, title case, camelCase, kebab-case, snake_case, CONSTANT_CASE, etc. 100% free, runs locally in your browser—nothing is uploaded to our servers.
Find & Replace
Literal or regex replacement with configurable flags. 100% free, runs locally in your browser—nothing is uploaded to our servers.
Simplified ↔ Traditional
Convert between Simplified and Traditional Chinese. 100% free, runs locally in your browser—nothing is uploaded to our servers.
Pinyin Converter
Convert Chinese characters to Pinyin. 100% free, runs locally in your browser—nothing is uploaded to our servers.
Guides and analysis
The Developer's Text Toolkit: 10 Essential Online Text Tools
A curated collection of 10 must-have text processing tools for developers—from regex testing to diff comparison, all in one place.
Regex Testing and Debugging: From Basics to Efficient Patterns
A practical guide to testing and debugging regular expressions, with syntax cheat sheets, performance tips, common pitfalls, and how to validate patterns online.
Complete Guide to Text Diff: Use Cases and Tips
Explains how text Diff works, Side-by-Side vs Unified views, practical tips for code review and document proofreading, and structured comparison with JSON Diff.
Text Case and Naming Style Conversion Guide: camelCase, snake_case, and More
Systematic guide to common programming naming styles (camelCase, PascalCase, snake_case, kebab-case, etc.) and their conversion rules, with step-by-step instructions.