Text Diff Checker – Free Online Tool to Compare Two Texts
Compare two texts instantly and find what changed. Great for draft review, copy checks, proofreading, revision tracking, and quick line-by-line comparison when you need to see what exists only in one version.
Lines only in Text A
Lines only in Text B
About this free Text Diff Checker
This free online Text Diff Checker helps you compare two text versions instantly and identify what changed. It is useful when reviewing revisions, comparing article drafts, checking copied content, validating updates, or spotting differences between two blocks of text.
Paste one version into Text A and another into Text B to see whether they match, which lines exist only in one version, and how many differences were found overall. For related writing and editing workflows, you can also use tools like Word Counter, Character Counter, Remove Duplicate Words, and Case Converter.
What this Text Diff Checker can do
- Compare two texts: Check whether two versions are identical or different.
- Find unique lines: See which lines exist only in Text A or only in Text B.
- Summarize differences: View matching state and line difference counts instantly.
- Useful for: revision checks, draft comparison, proofreading, text QA, and content review.
When to use a Text Diff Checker
Use a Text Diff Checker when reviewing revised copy, comparing notes, checking edits, validating content changes, or spotting differences between saved and updated drafts.
It is especially useful when the changes are small and hard to see visually in long text, such as one extra sentence, a removed paragraph, or a few lines rewritten in an updated draft.
Why comparing text versions matters
Comparing versions manually can be slow and error-prone, especially when the texts look similar at a glance. A text comparison tool makes it easier to isolate changed lines and confirm whether edits were added, removed, or replaced between two versions.
This is useful for writers checking revisions, editors comparing copy changes, marketers reviewing landing page drafts, and anyone trying to validate what changed between two saved texts.
Common text comparison use cases
Text comparison is useful for article revisions, proofreading passes, version review, comparing AI-generated outputs, checking copied content against an original, and reviewing updates before publishing. It can also help you compare notes, outlines, drafts, emails, or documentation edits line by line.
If you also need to measure content length after revisions, our Word Counter and Character Counter are natural companion tools.
Common text diff examples
Compare two article drafts
Paste an older draft into Text A and a revised draft into Text B to see which lines were removed, added, or changed before publishing.
Check copied text against an original
Use the tool to confirm whether copied content still matches the source or whether something changed during editing, formatting, or transfer.
Review quick revision notes
Compare two short note sets, paragraphs, or outlines to spot differences without reading every line manually side by side.
How to use
Paste your first text into Text A and the second version into Text B, then click Compare Texts to see the differences instantly.
Useful for
Great for article revisions, proofreading, comparing drafts, checking copied text, and spotting changed lines quickly.
Fast and private
Your text stays in your browser. No uploads, no signup, and no backend required.
Related guides
Useful when version comparison is part of a wider cleanup workflow before final review or publishing.
Helpful when comparing revisions and also measuring how much the length of the content changed.
Shows how comparison, cleanup, length checks, and final preparation can fit into one practical workflow.
Text Diff Checker FAQ
How do I compare two texts online?
Paste one text into Text A and the other into Text B, then click Compare Texts. The tool shows unique lines and identifies whether the texts match.
What does a Text Diff Checker do?
A Text Diff Checker compares two blocks of text and shows differences between them, including lines found only in one version.
When should I use a Text Diff Checker?
Use a Text Diff Checker when reviewing revisions, comparing drafts, checking copied content, or spotting changed lines quickly.
Is this Text Diff Checker free?
Yes. This Text Diff Checker is completely free and does not require signup.