Line comparison reveals document structure first
Classifying added, removed, and unchanged lines makes large edits easier to locate. Word detail is calculated only inside changed blocks.
043 · TEXT
Text Diff & Compare
Compare two text versions, classify additions, removals and changes, and inspect differences by line or word.
LOCALBrowser-local processing
LOCALBoth texts and comparison results stay in this browser and are not sent to or stored on a server.
A
Text A
Original or baseline version
Drop a file here
TXT · MD · CSV · JSON · XML · LOG
B
Text B
New or comparison version
Drop a file here
TXT · MD · CSV · JSON · XML · LOG
Service limit: 200,000 characters · 20,000 lines per text
HOW TO USE
How to use
- 01
Paste the two versions into Text A and Text B.
- 02
Choose Compare to classify line-level additions, removals, changes, and unchanged sections.
- 03
Switch to Word detail to inspect exact word and punctuation differences inside changed blocks.
- 04
Review summary counts and line references, then copy the plain-text diff report.
- 05
Use Clear all to reset both inputs, results, mode, and copy status.
EXPERT POST
Practical standards for reading text differences accurately
Separate line-level structure from word-level edits while preserving whitespace, punctuation, and Unicode source text for reliable comparison.A change is represented by related remove/add blocks
Adjacent removal and addition blocks at the same position are grouped as a change while the underlying raw states remain available for reconstruction.
Whitespace and blank lines are real differences
The default comparison does not normalize whitespace or Unicode automatically, so trailing spaces, blank lines, and punctuation can remain visible differences.
Word detail must preserve source reconstruction
Mixed Korean, English, Japanese, punctuation, and emoji should retain their original order so tokenization never corrupts the displayed source.
Read summary counts together with actual blocks
Added, removed, and changed totals are an overview. Use line references and the actual blocks before deciding what materially changed.
Source text and reports stay in the browser
Both source versions and the generated plain-text diff report are processed in browser memory and are not sent to an external server.
IMPORTANT NOTES
Important notes
- Text A and B are preserved exactly; Unicode normalization and whitespace cleanup are not applied automatically.
- Blank lines and trailing whitespace are treated as real differences by default.
- Adjacent removal and addition blocks at the same position are grouped as a changed block.
- Word detail is calculated only inside changed blocks and preserves Korean, English, Japanese, and emoji reconstruction.
- Everything is processed locally in the browser; source text and reports are not sent to or stored on a server.
FAQ
Frequently asked questions
01What is the difference between line and word modes?+
Line mode shows document-level structure. Word detail shows the exact words and punctuation that changed inside replacement blocks.
02How is a change detected?+
An adjacent removal and addition at the same diff position is grouped as a changed block while preserving the underlying remove/add data.
03Does whitespace count as a difference?+
Yes. The default comparison does not normalize whitespace, blank lines, or trailing spaces.
04Can I copy the comparison result?+
Yes. The tool generates a plain-text diff report that remains understandable without colors.
05Is my text stored on a server?+
No. Comparison and report generation happen only in the current browser.