Text Diff Checker Online — Free Tool
Quickly identify modifications, additions, and deletions between two textual documents using line-based diffs.
Inputs
Paste two versions to compare. Diff runs locally in your browser.
+2-1
Diff
1
line 1
2
-
line 2
3
line 3
4
1
line 1
2
+
line two
3
line 3
4
+
line 4
5
Note: This is a fast line-based diff intended for tool usage. For semantic diffs, we can add an advanced mode later.
Privacy note: All processing happens entirely in your browser. No data is sent to our servers.
About this tool
Compare two blocks of plain text to find additions, deletions, and unchanged lines. Faster than manual line-by-line review for contracts, configs, and copied content.
Works on any text—code, prose, CSV, or JSON strings.
Common use cases
- Verifying document revisions
- Finding drift between two config exports
- Plagiarism-style self-check between drafts
- Validating copy-paste from PDF vs source
How to use
- Paste the original text in the first field.
- Paste the updated text in the second field.
- Run compare to generate a diff.
- Review highlighted changes and share or export if supported.
This page is available at /tools/diff-checker/.
Understanding the result
- Identical texts produce an empty diff.
- Reordered paragraphs show as delete+add even if sentences match.
- Trim trailing spaces option reduces noise from formatting-only edits.
- Character-level vs line-level diff changes granularity of highlights.
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FAQ
Diff checker vs code diff viewer?
Both compare text. Code viewers often add syntax highlighting and side-by-side layout.
Ignore case?
Enable case-insensitive mode if capitalization should not count as change.
Compare files?
Paste file contents or use file upload if the tool supports it.
Privacy?
Browser-based diff keeps text local.