Text Diff
Compare and visualize differences between two texts
Compare Strings Online: Text Diff Checker & String Comparison Tool
Need to compare two strings or text blocks? Paste them here and every difference gets highlighted instantly — additions in green, deletions in red, unchanged text in grey. This string comparison tool works at both line level and character level, so even a single changed letter is caught. Whether you are comparing API responses, checking config files, reviewing code changes, or just figuring out what is different between two pieces of text — this online diff checker handles it. Also known as a "string compare online" tool, "string diff", "text diff", and "diff checker".
How to compare two strings online
Paste the first string in the left panel and the second string in the right panel. Differences are highlighted immediately — no button to click. Green highlights show what was added in the second version. Red highlights show what was removed from the first version. You can switch between side-by-side view and inline view depending on what works better for your comparison.
Character-level string matching
Most diff tools only show which lines changed. This tool goes deeper — it highlights the exact characters within a line that differ. So if you have a 500-character string and only one letter is different, that single character gets highlighted. Extremely useful for debugging API responses, finding typos, and comparing serialized data.
Common uses for string comparison
Developers use this tool for comparing JSON API responses before and after changes, checking if two config files are identical, reviewing code diffs without a git client, verifying that a text transformation produced the expected output, and finding subtle differences in translated content or localized strings.