How do I compare two texts online for free?

Paste or type your original text in the left panel and the modified text in the right panel. Differences are highlighted automatically in real time — no button click needed. You can switch between line, word, and character comparison modes.

Can I merge differences between two texts?

Yes. In line mode, arrow buttons appear in the center gutter next to each difference. Click the right arrow to copy a change from left to right, or the left arrow to copy from right to left. Changes update instantly.

Does this text compare tool work with large files?

Yes. The diff algorithm runs in a Web Worker off the main thread, so the UI stays responsive even with large text inputs. An adaptive debounce ensures smooth typing for texts of any size.

Can I ignore whitespace or case when comparing text?

Yes. Use the 'Ignore whitespace' checkbox to treat multiple spaces, tabs, and trailing whitespace as equal. Use 'Ignore case' to make the comparison case-insensitive.

Is my text safe when using this diff tool?

Your text never leaves your device. All comparison and diff processing happens locally in your browser — no data is sent to any server.

Text Compare

Left Text

Right Text