Compare Two Texts

Compare two texts and highlight exactly what changed.

Text Diff Checker

Instant online text processing

Words19

Characters99

Sentences2

Paragraphs1

Reading Time1 min

Input Text

Transformed Output

The quick brown fox jumps over the lazy dog. Online tools should be fast, private, and easy to use.

Ad Space (auto) — Configurable via NEXT_PUBLIC_ADSENSE_CLIENT

What does Text Diff Checker do?

Paste two versions of a text to see a line-by-line comparison with additions, deletions and changes highlighted. Options let you ignore case, whitespace and blank lines so you see meaningful differences rather than noise.

How to Use Text Diff Checker

1
Paste the originalInto the left panel.
2
Paste the new versionInto the right panel.
3
Read the diffChanges are highlighted and counted.

Key Features

Line-by-line diff with additions and deletions colour coded
Word-level highlighting inside changed lines
Ignore case, whitespace or blank lines
Summary counts of added, removed and unchanged lines
Side-by-side and unified views
Colour is paired with symbols, so the diff is readable without relying on colour

Frequently Asked Questions

How does the comparison work?

It computes the longest common subsequence between the two texts, which is the same algorithm behind the diff command and version-control tools. Lines not in that subsequence are shown as added or removed.

Can I compare code?

Yes. The diff is language-agnostic and works on any plain text. Turn off whitespace ignoring if indentation matters, as it does in Python and YAML.

Why should I ignore whitespace?

Because a file re-saved by a different editor can change every line ending or add trailing spaces, drowning the real changes. Ignoring whitespace surfaces only the edits that matter.