Diff viewer

Compare text and files with syntax highlighting.

Compare

View

Ignore spaces

Ignore case

Line numbers

Wrap lines

Original

Changed

Differences

0 additions0 deletions0 changes

1|1

Diff Viewer compares two texts or files and shows what was added, removed, and changed, in unified, split, or side-by-side form.

Runs entirely in your browser. Your files never leave your device.

1.Put the original on the left and the new version on the right, and check you have them the right way round.
2.Pick the view, then set language, whitespace, case, line numbers, and wrapping to suit the content.
3.Read every addition and deletion in context, then look again with the ignore options off.

Unified, split, and side-by-side suit patches, single lines, and reading two versions in parallel.
Ignoring whitespace and case cuts the noise, and can also hide a change that mattered.

It compares text. It does not understand meaning, moved blocks, compiled behavior, or binary files.
Ignoring whitespace is dangerous in any language where indentation or spacing is part of the syntax.

Why is a moved paragraph shown as a delete and an add?

Line-based diffs usually describe a move that way: gone from there, arrived here.

Should I ignore whitespace when reviewing code?

Only where the language does not care. Python, YAML, and formatted data all care.