Text Diff

Compare two versions of any text — paste side by side, run the diff, and read additions (green), removals (red) and inline character-level edits. A Myers line diff powers the side-by-side view, with a character-level pass for changed lines and a similarity score.
All processing happens locally in your browser — your data is never uploaded to any server.
Original (before)
Changed (after)
Paste text on both sides and click Compare Diff to see the result.

                                                            


                                                            
                                                            


                                                            
                                                            

                                                                How to use — Put the original text on the left and the changed text on the right, then click Compare Diff (or press Ctrl+Enter).

                                                                Reading the view — unchanged lines span both columns; red lines were removed, green lines were added. Lines that were changed pair a removed line with an added line, and the inline character diff marks the exact characters that were deleted (deep red) or inserted (deep green).

                                                                Options — Ignore case and Ignore leading/trailing whitespace soften the line comparison; Inline character diff switches the per-line character highlighting on or off.

                                                                Unified view — click Toggle Unified View to see the same result as a unified diff text (+/- prefixes) that you can copy or download.

                                                                Binary files? — to compare executables, images or any other binary data byte by byte, use the Binary File Compare tool.

                                                                For very large inputs the tool truncates gracefully at 200,000 characters / 10,000 lines per side and warns you. All data is processed locally — nothing is uploaded.