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Text compare — free online diff checker

Compare two texts and find added or removed lines. Ignore case or spacing, hide matching lines and copy a clear report. Free, private and browser-only.

● Your files stay yours

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Each side must contain at most 50,000 UTF-16 code units and 500 lines.

Spacing mode collapses runs of spaces/tabs and trims line edges. It does not remove blank lines. Case mode uses Unicode lowercase conversion, not language-specific matching.

Paste text on either side, or try the example.

How to use this tool

Paste the original and revised text, then select Compare texts. Read removed lines from the original and added lines from the revision. Choose optional case or spacing rules before comparing. Hide matching lines to focus on changes, or copy the report.

Good to know

Plain text only: up to 50,000 UTF-16 code units and 500 lines per side. Compares whole lines, not individual words, document formatting or meaning. CRLF, CR and LF line endings are treated alike; a final newline creates an extra empty line. Empty sides are allowed. No files, uploads or saved history.

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Developer

Text comparison questions

What does the checker compare?

It matches lines in order and highlights insertions and deletions. Replacing a line appears as one removal and one addition. It does not interpret the meaning of prose or code.

Can I ignore capitalization or whitespace?

Yes. Case mode converts comparison keys to Unicode lowercase. Spacing mode collapses spaces and tabs and trims line edges. Original text stays intact. Matching rows show the revised version, so ignored differences are not highlighted.

Why does a trailing newline appear as a change?

A final line break creates a final empty line in this tool. Blank lines are preserved, while Windows, Unix and classic Mac line-ending styles are normalized.

Is this a document comparison or plagiarism checker?

No. Paste plain text from your documents. Formatting, images, PDF/Word files, semantic similarity and plagiarism detection are not supported. Text stays in your browser.