Online-Text-Diff-Checker
Paste the two versions into the left and right panes and the page computes a line-level diff as you type, colour-coding added, removed and modified content. It suits two configs, two revisions of a file, two log excerpts, or a change someone sent you.
The comparison runs entirely in your browser; the text is never uploaded.
Features
- Unified View — Shows differences line by line with + and - prefixes, close to the git diff reading experience.
- Side-by-Side — Two aligned columns with changed lines matched up, which makes checking line by line much easier.
- Case Sensitivity — Turn case sensitivity off to ignore the difference between Hello and hello.
- Ignore Whitespace — Ignore leading and trailing spaces and indentation changes, and focus on the content itself.
- Live Comparison — The diff recalculates as you type — there is no button to press.
How to use
- Paste the original text into "Original text A" on the left.
- Paste the updated text into "Compared text B" on the right.
- Choose unified view or side-by-side view above.
- Toggle "Case sensitive" and "Ignore whitespace" to suit the comparison.
FAQ
What do the colours in the result mean?
A green background marks added lines, a red background marks removed ones, and uncoloured lines are identical on both sides. Changed words within a line are highlighted more strongly so you can find them inside long lines.
Can it compare binary files?
No. This is a line-level text comparison; binary data needs a dedicated hexadecimal diff tool.
Will very large texts be slow?
The algorithm scales with the number of lines, and anything up to a few thousand lines is effectively instant. With tens of thousands of lines and very large differences the browser may briefly stutter, so it is worth trimming to the section you actually need to check.