Offline Conversion Upload Error Explainer for Google Ads

How to fix Google Ads offline conversion upload errors

When an offline conversion upload fails, Google Ads gives you a spreadsheet with one short message per row. This tool reads Google Ads offline conversion upload errors in that file, explains each one in plain words with the fix from Google's errors and discrepancies page, and sorts every row into what you can upload again, what to retry later and what can't be imported.

1. Download the errors. In Google Ads go to Goals › Conversions › Uploads and click Download errors next to the file. Drop that file here. You can also paste the messages on their own, one per line — including Google Ads API codes like UNPARSEABLE_GCLID.
2. Check the columns. The tool finds the Results column and your Google Click ID, Conversion Name and Conversion Time columns by their names.
3. Choose how to fix early times. For “conversion before click” rows, the tool can add 1 or 2 days, as Google suggests, or leave them out so you can fix the time zone instead.
4. Read the groups. Every message is grouped by cause, with your row numbers and the fix. Rows with a damaged click ID are checked and repaired where possible, such as URL-encoded characters.
5. Download your files. You get a re-upload file in your own layout, with times and values rewritten in Google's formats, a retry-later file and a report of every row.

What to do next in Google Ads

1. Fix settings first. If rows failed for the wrong account, a missing conversion name or permissions, fix that in Google Ads before anything else. Check the Conversion source column on the Conversions page: it must say Import from clicks.
2. Upload the re-upload file. Go to Goals › Conversions › Uploads, click +, choose Upload a file, pick the file, preview it and click Apply.
3. Upload the retry-later file after the wait. 6 hours for clicks that were too recent, 12 hours for “still processing”.
4. Check the result. Back on the Uploads page, the Status and Results columns show whether every row went in. Imported conversions appear by click date, so look at the by conv. time columns when you compare.

Other Google Ads upload errors and fixes

Unparseable GCLID: “The imported gclid could not be decoded”

The click ID in your file is not the one Google created. Usually a CRM, form tool or spreadsheet changed it: lowercased it, cut it short, added text or turned characters into codes like %2D. The tool repairs what it safely can and tells you which rows are lost.

Unknown clicks

Google couldn't link the conversion to a Google Ads click. With enhanced conversions for leads this is normal for customers who came from other channels, and Google says you can generally ignore it. If every row shows it, check your forms.

Not authorized to upload conversions to this account

Google's label is Check permissions. The account must be linked to your manager account, and the account that owns the conversion action must be the one that uploads.

Google Ads offline conversion duplicate error

Google drops a conversion when the same click, conversion name and time are already in your account. If two rows are really two sales, give each its own time or order ID.

Offline conversions not showing in Google Ads

If the upload worked but the numbers look low, it is often timing: Google says processing typically takes less than 12 hours, and reports count conversions on the click date. A conversion action that counts only one conversion per click also drops the rest.