Text & string tools online

Diff, regex testing, case conversion, slugs, word count, Unicode analysis. Browser-only string processing, no data uploaded.

// 7tools in this category

text diffnew

line-level diff between two texts

case normalizernew

camelCase, snake_case, kebab-case, PascalCase and more

regex tester

live match highlighting, explain mode

slug generatornew

url-safe slugs from any text, supports cyrillic

string inspectornew

length, bytes, unicode, entropy, character frequency

word counternew

characters, words, lines, reading time

json diffnew

deep-diff two json objects — added, removed, changed

// about

Text processing is a daily task for every developer — comparing two config files, testing a complex regex, converting variable names between naming conventions, or counting characters for SEO. These tools bring common string operations into the browser with real-time feedback. Every operation processes input on the client side and updates the output within milliseconds.

// common use cases

Compare two versions of a configuration file to spot unintended differences
Test a complex regex before adding it to production code
Convert a blog post title to a URL-safe slug with Cyrillic support
Count words and estimate reading time for technical documentation

// faq

What regex flavors are supported?

The regex tester uses the browser's native JavaScript RegExp engine (ECMAScript 2015+). It supports lookahead, lookbehind, named capture groups, and Unicode properties, but not PCRE-only features like possessive quantifiers or atomic groups.

Can I compare large files?

The text diff tool handles text up to several hundred KB comfortably. For very large files (>1 MB), git diff in a terminal will be faster.

What does the string inspector show?

Length in characters, byte length in UTF-8, word count, unique characters, Shannon entropy (useful for detecting encrypted or compressed strings), and a character frequency table.