Diff Checker
Compare two blocks of text and see word-level additions and deletions highlighted instantly.
Free, no signup — perfect for reviewing edits, contracts, or content revisions.
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How to Compare Text Online
Spot exactly what changed between two versions of text in three steps.
Paste Both Texts
Drop the original text on the left and the changed version on the right.
Compare
Click Compare Text to see word-level additions and deletions highlighted.
Copy or Download
Copy the diff with +/- markers or download it as a .txt file.
// diff
The quick brownred fox jumps.
Word-Level Precision
Changes within a sentence are highlighted precisely, not just whole lines.
Change Stats
See exactly how many words were added and removed at a glance.
Instant Results
Comparison happens instantly. Copy the diff or download it as a .txt file.
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Frequently Asked Questions
What does the Diff Checker do?
It compares two blocks of text word-by-word and highlights exactly what was added and what was removed between them, along with a word count of each.
Does it compare line-by-line or word-by-word?
It performs word-level comparison, so small edits within a sentence are highlighted precisely instead of marking the whole line as changed.
Is my text stored anywhere?
No. Both texts are only used to compute the diff on request and nothing is saved afterward.
Can I download the diff result?
Yes, you can copy the plain-text diff (with +/- markers) or download it as a .txt file.
How do I compare two versions of a document?
Open both versions, copy the text of the older one into the left box and the newer one into the right box, then hit Compare. Every added word is marked green and every removed word red, so a single changed clause in a long contract or essay is easy to spot.
Can I compare two code files?
Yes. Paste each file's contents into one side. Because the comparison is word-level, a renamed variable or a changed argument shows up on its own rather than flagging the entire line.
How do I compare two lists to find what is missing?
Paste one list per side, one item per line. Anything present in only the right list is marked as an addition and anything only in the left is marked as a deletion, which gives you both directions in a single pass.
Do I need to upload a file?
No. There is no upload step — you paste the text directly, the diff is computed on request, and nothing is saved afterward.
Is this a free Diffchecker alternative?
Yes. The Diff Checker is completely free with no signup, no login, and no limits, and it covers the paste-and-compare workflow most people open a diff site for.
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