Language: English

Text Compare

Paste original A and text B to see the added, removed and changed lines right away.

🔒 What you enter is never sent to a server. It is compared only in your browser.

Each box can hold up to 5,000 lines and 200,000 characters.
Options

Added lines
Removed lines
Changed lines

Result

The copied result is unified diff text with three lines of context. The left line number is original A and the right one is text B.

How to use

  1. Paste text into the original A box and the text B box.
  2. Choose [Ignore case] or [Ignore spaces at line ends] if you need them.
  3. When you stop typing, the texts are compared and the counts of added, removed and changed lines appear with the result. Words that differ inside a changed line are shown in bold.
  4. [Copy result] copies the result as unified diff text (with three lines of context).

Example

If original A is "3 apples / 2 pears / 5 oranges" and text B is "3 apples / 4 pears / 5 oranges / 1 plum", the result is one changed line (2 pears → 4 pears, with the number highlighted) and one added line (1 plum). Use it to find edits between versions of a contract or manuscript, or changed lines in a settings file.

Supported formats, limits and privacy

  • Input: up to 5,000 lines and 200,000 characters per box. Beyond that the texts are not compared and a message explains why. Compare long documents in parts.
  • It finds the fewest line additions and removals (longest common subsequence). When removed lines are followed by added lines, they are paired from the top and counted as "changed".
  • If identical lines are shuffled around so that more than 2,000 edits are needed, the comparison stops with a message so the page does not freeze.
  • Word highlighting inside a changed line appears only when the two lines are fairly similar. The result shows changed lines with three lines of context and folds the other unchanged lines.
  • Whether the last line ends with a line break, and the kind of line break (CRLF or LF), are not compared. Ignoring spaces applies only to the start and end of each line; spaces in the middle are still compared.
  • What you enter is compared only inside this browser. It is not sent to a server or stored, and it disappears when you close the page.

Frequently asked questions

Why is a line marked "changed" when only a little changed?

The comparison works line by line, so a single different character makes the line a changed line. The words that actually differ inside it are shown in bold so you can see what changed.

Can I ignore indentation or letter case?

[Ignore spaces at line ends] treats lines that differ only in leading or trailing spaces and tabs as the same, and [Ignore case] does the same for upper and lower case letters. The result shows the text of original A as it is.

Is my text saved anywhere?

No. The comparison runs entirely in this browser and nothing is sent or stored. The text disappears when you close the page.