Utileno
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LOCAL TOOL · TEXT

Text Diff Checker

Paste two versions of a text and see exactly which lines were added, removed or changed.

How to use
  1. Paste the original text on the left and the new version on the right.
  2. Press Compare.
  3. Read the unified result: green lines were added, red lines were removed, unchanged lines stay plain.
Examples
Contract revision check
Paste last week’s version and today’s version of an agreement to instantly see every line the other side edited.
Config file drift
Compare the config from two servers to spot the one changed line causing different behavior.
Duplicate Line RemoverPaste a list, and repeated lines disappear — with control over case, whitespace and ordering.Word & Character CounterPaste or type text and get live character, word, line, paragraph and byte counts — nothing is uploaded.JSON Formatter & ValidatorFormat, validate and minify JSON without uploading it — your data stays in your browser.
FAQ
How does the comparison work?
The tool computes a longest-common-subsequence diff over lines — the same family of algorithm used by version control systems like Git — and shows the minimal set of added and removed lines.
What counts as a “changed” line?
When a removed line is directly followed by an added line, the pair is counted as one changed line — an edit in place rather than separate deletion and addition.
Does it compare characters within a line?
This tool compares whole lines, which keeps results fast and easy to read. A line with any change shows as removed + added.
Is there a size limit?
Texts of up to about 1,500 differing lines get an exact minimal diff. Beyond that, the differing middle section is shown as one replaced block so the page stays fast.
Are my documents uploaded?
No. The comparison runs entirely in your browser; neither text leaves your device.