Text Compare
Compare two texts line by line and see exactly what was added or removed.
The Text Compare tool diffs two versions of any text and shows the differences line by line: identical lines in plain text, added lines in green with a + marker, and removed lines struck through in red. Paste an original and a modified version to see exactly what changed — nothing more, nothing less.
This is the tool for checking edits, reviewing someone's rewrite, verifying that your changes landed, or comparing two copies of a config, essay or terms page for accidental drift. Case-insensitive and whitespace-tolerant modes let you ignore trivial differences when you care about content rather than formatting.
The diff uses the longest-common-subsequence algorithm, the same foundation as Git's diff: minimal, accurate change lists. It handles thousands of lines in your browser, and nothing you paste is transmitted anywhere.
Paste two versions of a text to compare them line by line. Differences are shown as + added and − removed rows.
How to use the Text Compare
- Paste the original text on the left.
- Paste the modified text on the right.
- Read the summary: identical, added and removed lines.
- Scan the colored diff — + green rows are new, − red rows were removed.
- Toggle case/whitespace options if trivial differences are noise.
Frequently asked questions
How does the diff decide what changed?
It aligns both texts to maximize the number of identical lines (the longest common subsequence), then flags every line that does not line up as either added (only in the new text) or removed (only in the original). The result is the minimal change set.
Can I compare files instead of pasted text?
Paste both file contents side by side — file comparison and text comparison are the same operation once the content is in the boxes. For very large files, split the comparison into sections to stay within comfortable browser limits.
Is this a word-level diff?
No — differences are reported per line. For paragraph-based text (essays, articles) a line diff is usually what you want; for single-line changes inside long lines, consider a dedicated word-diff tool or split long lines first.
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