Text extraction can fail for several reasons:
- Scanned PDF - The PDF contains images of text rather than actual text. Try using OCR software first.
- Password protected - Remove password protection before uploading.
- Corrupted file - Try re-saving the document and uploading again.
- Unsupported format - Ensure the file is PDF, DOCX, DOC, or TXT.
If issues persist, try converting to a different format (e.g., DOCX to PDF) and re-uploading.