Osprey Text Diff

Compare two blocks of text and see every difference highlighted — no signup, no uploads, completely free. Paste the original on the left and the changed version on the right. Added lines show in green, removed lines in red, and unchanged lines stay neutral. Unlike Diffchecker.com or text-compare.com, your text never leaves your device. Everything runs in your browser using a Longest Common Subsequence (LCS) algorithm implemented in pure JavaScript.

How does the text diff checker work?

Paste the original text on the left and the changed text on the right, then click Compare. The tool uses a Longest Common Subsequence (LCS) algorithm to identify added, removed, and unchanged lines, then highlights the differences with color coding.

Is my text sent to a server?

No. The entire comparison runs in your browser using JavaScript. Your text never leaves your device. No data is collected, stored, or transmitted.

What does each color mean?

Green highlighted lines were added in the new text. Red highlighted lines were removed from the original text. Lines with no highlight are identical in both texts.

Is there a text length limit?

No hard limit. The LCS algorithm runs in your browser and handles most documents instantly. Very large texts (10K+ lines) may take a few seconds to process depending on your device.