关于 免费在线比较PDF

Upload two PDF files and instantly see a side-by-side diff highlighting what changed between them. Extracts all text from both documents via PDF.js, then runs an LCS-based diff algorithm. Switch between line-by-line, word-by-word, and character-by-character comparison modes. Added text is highlighted green, removed text is red, unchanged text is gray. See a similarity percentage score, plus counts of added/removed/unchanged blocks. Filter to show only changes. Export the diff as a text file.