๐ Diff Checker
Compare two texts and see every difference highlighted. Free online diff tool, line by line, private and browser-based.
๐ Diff Checker
๐ง Loading toolโฆ
About the Diff Checker Tool
Finding what changed between two versions of a document by reading them side by side is slow and unreliable โ the eye skips over single-word changes constantly. A diff does it mechanically, aligning the two texts and marking every insertion, deletion, and modification.
This is the same technique version control systems use for code review, applied to any text. It is equally useful for contracts, configuration files, and article drafts. Comparison runs entirely in your browser, so confidential documents are never transmitted.
How to Use Diff Checker
- Paste the original text into the left input.
- Paste the modified version into the right input.
- Press Compare to align the texts and mark differences.
- Review the highlighted additions and removals.
When to Use This Tool
- Reviewing what changed between two contract drafts
- Comparing configuration files across environments
- Checking edits made to an article or manuscript
- Verifying a data file was modified as expected
- Finding an accidental change in a text file
Things Worth Knowing
- Comparison is line-based, so a change anywhere in a line marks the whole line as modified.
- Whitespace differences are detected and shown, which is often exactly what you need.
- Both texts are processed in your browser and nothing is uploaded.
Quick Facts
| Tool name | Diff Checker |
| Category | Text Tools |
| Price | Free โ no account, no trial, no watermark |
| Where it runs | Entirely in your browser (client-side) |
| Files uploaded | None โ your data never leaves your device |
| File size limit | None imposed; limited only by device memory |
| Works offline | Yes, once the page has loaded |
| Platforms | Windows, macOS, Linux, Android, iOS |
Frequently Asked Questions
Can it compare files rather than pasted text?
Paste the contents of each file into the input areas. The comparison is identical regardless of how the text arrives.
Does it detect moved blocks of text?
Line-based diffs report moved content as a deletion in one place and an addition in another, rather than recognising it as a move. That is standard diff behaviour.
Are trailing spaces detected?
Yes. Whitespace differences register as changes, which is useful when debugging files where invisible characters matter.
Is my text sent to a server?
No. The entire comparison runs in your browser, making it appropriate for legal documents and confidential drafts.