TextCompare Tool compares documents, scans for duplicate phrases, or checks one document for practical AI markers locally in your browser.
Tool Modes
- Compare: highlights inserted, deleted, and replaced text across Original (A) and Changed (B).
- Dupes: scans text for duplicate phrases; Side By Side searches Changed (B) for phrases from Original (A).
- AI Markers: scans Original (A) for hidden Unicode artifacts, assistant-like phrases, vocabulary clusters, patterns, and formatting clues. These are indicators, not proof.
Compare Modes
- Line: fastest, best for broad structural changes, less exact inside sentences.
- Word: default, best for documents and paragraphs.
- Char.: most granular, useful for small edits, punctuation, and spelling changes.
AI Markers
- Use AI Markers to scan one document for practical indicators such as invisible Unicode characters, assistant metacomments, em dash patterns, vocabulary clusters, repeated rhetorical forms, and formatting artifacts.
- The Show checkboxes control which marker categories are visible in the document, heatmap, and sidebar. Cmd/Ctrl-click a checkbox to customize the individual items in that category.
- Click Paste text or drop a file, or click here for an example in Original (A) to load a sample marker test and scan it.
- AI Markers runs locally and reports indicators only. It does not prove AI use.
Double Clicks
- Scrollbar Heatmap: collapse or expand the Changes panel.
- Output headers: hide or show the input text boxes.
- Changed text in either output pane: expand the matching change card.
- Change card: expand the preview for a more detailed diff.
Shortcuts
- Enter: compare with the current mode.
- 1, 2, 3: choose Line, Word, or Char.
- N: show or hide line numbers.
- V: switch between side by side and single view.
- L: toggle scroll lock.
- T: cycle the theme.
- +/-: increase or decrease text size.
- Shift + +/Shift + -: increase or decrease line height.
- ?: toggle Getting Started.
- Left/Right: previous or next change.
- Up/Down: scroll most of a pane.
- Cmd/Ctrl + S: save cache.
- Cmd/Ctrl + Shift + S: download the change summary.
- Cmd/Ctrl + Delete: clear both documents.
- Esc: cancel an active comparison.
- Cmd/Ctrl + Z: undo app actions outside text boxes; native undo inside text boxes.