Compare Files Online
Choose two text files or PDFs with readable text to see which lines were added, removed or changed. Review both versions side by side or in one column, then download a .diff record.
Compare two files
TXT · MD · JSON · CSV · HTML · CSS · JS · PDFEach text file can be up to 10 MB; each PDF up to 50 MB. PDFs need readable text and can only be compared with another PDF.
AFILE A · Original
Or paste text below
BFILE B · New version
Or paste text below
Files are read and compared in your browser without uploading them to KitoTool for processing.
Comparison results
Added lineRemoved lineChanged lineUnchanged
How to Compare Two Files in 4 Steps
01
Choose or paste two files
Choose file A and file B from your device, or paste text or code into both editors.
02
Run the comparison
Click Compare now. A is the original and B is the new version; edited lines are marked on both sides.
03
Review every difference
Use search, Previous/Next, line numbers and synchronized scrolling to inspect both sides.
04
Switch view or export
Choose Side-by-side or Unified diff, then download the .diff record. It is not a patch for automatic application.
Read changes from version A to version B
A is the original and B is the new version. Use Side-by-side to compare aligned rows, or Unified diff to read additions (+) and removals (−) in one column.
| Result | Meaning | What to check |
|---|---|---|
| Added | Content appears in B; edited lines are included. | Select the count and inspect B or a + line. |
| Removed | Content appears in A; edited lines are included. | Select the count and inspect A or a − line. |
| Different lines | Each added, removed or edited row counts once. | Check highlights for changed words or spaces. |
An edited line appears in both Added and Removed, so those two counts should not be added together to get Different lines.
If a file fails or the result looks wrong
- Scanned, password-protected or mixed PDF input
- Choose two unlocked PDFs with selectable text. The tool compares extracted text page by page, not images, fonts or layout.
- Garbled text or a rejected file
- Use UTF-8 text files; binary files cannot be compared. Check what appears in the A/B editors before comparing.
- PDF pages moved or inserted
- Pages with the same number are compared. Review following pages before assuming all their text changed.
- Only line endings changed
- CRLF and CR are normalized to LF for comparison, so that difference does not appear as a changed line.
Text Compare
Paste original and revised text to review additions and removals, then copy or download a marked TXT version.
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JSON Formatter
Format, validate and minify JSON in your browser. Review syntax errors and copy the result.
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