Error Injection Tool

✎ Upload a PDF or paste text, then click Generate errors

📚 How to use

1Upload a PDF or paste text into the sidebar.

2Set the number of each auto error type using the sliders.

3Click Generate errors to inject errors into the passage.

4Click Reveal errors to highlight them and show the answer key.

⚠ Auto error types

SSpelling — common word misspellings from a built-in dictionary.

CCapital — lowercases the first letter of a sentence.

HHomophone — swaps their/there/they’re and your/you’re.

✎ Manual tagging

1Click Edit passage text to modify the text and construct a run-on or fragment.

2Click Done editing when finished.

3Click and drag to select the words you want to tag.

4Click Tag as Run-on or Tag as Fragment to mark the selection.

5For spelling, capitals, and homophones — click any word and choose a type from the popup toolbar.

🖨 Printing

•Print worksheet — plain text with error checklist, no highlights.

•Print answer key — highlighted passage with full error list.