Text Diff Checker
Compare two blocks of text and see a line-by-line diff showing what was added, removed or kept the same. It is the quick way to spot changes between two versions of a config file, a copied paragraph, a log excerpt or any pasted content when you do not have a full version control diff handy. This checker uses a longest-common-subsequence comparison, the same core idea behind standard diff tools, so it aligns matching lines correctly instead of naively comparing line by position. Added lines are marked in one color and removed lines in another. Paste the original on the left and the new version on the right, then compare. All processing runs in your browser, so your text never leaves your device.
How to use Text Diff Checker
- Paste the first block of text.
- Paste the second block to compare.
- Read which lines were added, removed or kept.
Frequently asked questions
How does the text diff work?
It compares the two blocks line by line and marks each line as added, removed or unchanged between the two versions.
Is the comparison line-based or character-based?
It is line-based, so it tells you which whole lines differ rather than highlighting individual characters within a line.
Does it care about trailing whitespace?
Lines are compared as written, so differences in whitespace count as a change unless the lines are otherwise identical.
What is Text Diff Checker?
Compare two blocks of text and see a line-by-line diff showing what was added, removed or kept the same. It is the quick way to spot changes between two versions of a config file, a copied paragraph, a log excerpt or any pasted content when you do not have a full version control diff handy.
Is Text Diff Checker free to use?
Yes. Text Diff Checker is completely free, with no sign-up and no usage limits.
Does Text Diff Checker work in a web browser?
Yes. Text Diff Checker runs in any modern web browser. There is nothing to download or install.
Is my data private with Text Diff Checker?
Yes. Text Diff Checker runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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Link this tool from a README, doc or site. The badge links back to this page.
[](https://yourhack.ai/text-diff)