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Check Google Ads Customer Match CSV Upload Errors

Check headers, email, phone, address, and encoding before uploading Customer Match data.

Check CSV

＋Choose a CSV fileThe file is checked in your browser.

🔒 The CSV file itself is not uploaded to BlueprintLab.

How to use this tool

Check headers, email, phone, address fields and encoding before upload.

Use Try sample to inspect the included sample.
Set ＋ Choose a CSV file The file is checked in your browser..
Use Check CSV to process the input.
Compare the result with your source data and return to the input to make corrections.

＋ Choose a CSV file The file is checked in your browser.: .csv,text/csv

Input and settings example

Email,Phone,First Name,Last Name,Country,Zip
[email protected],+819012345678,taro,yamada,JP,1000001

Use it as a preflight check, not a promise from Google

This checker looks for obvious CSV problems before upload: headers, identifier fields, encoding and basic value shape. Passing here means the file is cleaner; it does not simulate Google Ads account eligibility or server-side policy checks.

CSV can look fine and still be wrong

The tricky part is that a spreadsheet can display perfectly while the exported CSV has a different encoding, a changed phone format or an unexpected header. Checking the exported file catches the thing you are actually about to upload.

What is worth checking twice

Header names match the format you intend to upload.
Phone, email and address columns have not been auto-reformatted by the spreadsheet app.
The file encoding is the one you expect.

A small sample is enough to expose many mistakes

Try a file with just a header and one or two rows first. If the structure is wrong, it is much faster to fix that before exporting the full customer list.