Compare Text - Side-by-Side Diff Checker

Find changes between two texts by word, line or character. Import .txt files, ignore case, and copy or save a comparison report.

Compare Text is a side-by-side text comparison tool for two versions of plain text. Paste an original and a changed version, choose how closely to compare them, and see additions and deletions in the same two panels. Use the text diff to review edits, inspect a configuration change or find a small difference between strings. 🔎 Choose the level of detail • Words mode helps review changes in sentences without treating every letter as a separate edit. • Lines mode is useful for lists, code snippets and text files with a meaningful line structure. • Characters mode finds smaller changes inside words or values. Pick the mode that matches your question. For example, a rewritten paragraph is often easier to read by word, while a changed digit in an identifier may be clearer by character. The comparison works on the text you provide; it does not evaluate whether two passages have the same meaning. 👀 See both versions together Click Compare texts to replace the editors with highlighted differences. Added and removed content is marked in the two original panels, so you can read each version in context. Their vertical scrolling is linked to help keep your place. Use Edit texts to return to the source fields and continue revising. The swap control exchanges the original and changed versions when you want to review the comparison in the other direction. After changing either text or the comparison settings, run Compare texts again for a fresh report. 🎯 Focus on changes that matter Turn on Ignore case when uppercase and lowercase differences should not count as edits. The displayed source text keeps its original capitalization; the option changes the comparison, not your input. You can compare two strings, check revisions to a message, or inspect pasted code as plain text. Whitespace remains part of the input. This is a literal text comparison, so it is different from a plagiarism check, a semantic similarity score or a structured JSON comparison that ignores object key order. 📄 Bring in text files and keep a report Each panel has its own Import .txt control, and you can drop a text file into the corresponding panel. Imports use UTF-8. This supports comparing two text files without uploading their contents to an online document service. • Copy report puts a text representation of the completed comparison on the clipboard. • Download .txt saves the same report as a file. It uses + and - markers with escaped fragments so spaces and line breaks remain identifiable. The result is a readable comparison report rather than a Git patch or a merged replacement document. 📏 Practical review boundaries Each side supports up to 200,000 characters. Complicated comparisons can take longer than simple edits of the same length; a slow comparison stops with guidance to use Lines mode or compare a smaller section. Cancel is available while work is running. The tool accepts plain text, not Word or PDF documents. To review text taken from a document, paste its extracted text; page layout, fonts, images and document formatting are not compared. Character mode follows Unicode code points, so some combined visual characters contain multiple units. The extension opens in a separate Chrome tab and runs the comparison locally. Your pasted material and imported text files stay in that workspace instead of being sent to a comparison server.