Why QuickBooks Says “The Uploaded File Isn’t a Valid Web Connect File”

QuickBooks shows the uploaded file isn’t a valid Web Connect file when it cannot treat the bytes as OFX/QBO. That is a file-shape problem, not a categorization problem.

Check the file, not the register

1. Confirm the download is actually .qbo, not a PDF or CSV renamed in Finder.
2. Confirm it is text: you should see OFXHEADER or <OFX> in a text editor.
3. Look for a UTF-8 BOM, NUL bytes, or junk after </OFX>.
4. Do not regenerate FITIDs to “make it import.”

QBO Clinic runs this check in the browser and names the rule that failed.

Diagnose a file