Text Diff Checker

Compare two texts and see word-level differences.

Guides, articles & comparisons

Compare two PDFs for differences in your browser. See added and removed words highlighted, and learn what a text diff can and cannot catch.

A regex that looks right can still match too much, too little, or hang. Test it against real inputs in your browser before it reaches production.

Minified JSON is great for machines and painful for people. Learn to format, validate and minify JSON, and spot the usual syntax errors fast.

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Count words, characters, sentences, and paragraphs.

Test your typing speed and accuracy in words per minute.

Convert text between UPPERCASE, Title Case, camelCase, and more.

Turn a title into a clean URL slug.

Estimate reading time and Flesch readability score.

Find the most frequently used words in a piece of text.

MergeDoc — PDF tools that run entirely in your browser. No uploads, no servers.