Upload Emails for Verification

Upload your emails in TXT, CSV, XLS, or XLSX files.

Tamas Szabo Written by Tamas Szabo I

Prepare your file

You can upload your emails in one of the following file formats:

  • TXT: you can have 1 email per line, no additional data 
  • CSV, XLS, XLSX: you can have any number of columns, any additional data (such as name or address), but you must have all your emails in the same column.


We don't require any other data other than emails. You may or may not have a header row in your file. We will automatically detect the email column.

You can find an example file here: Example_file.csv.


How big files can I upload?

We recommend uploading a file containing no more than 1 million emails. Our system can handle larger files as well, but you get a better overall speed and get results quickly if you upload them in smaller files (e.g., 1 million per file).

The maximum file size to upload is 100MB.

If each of the files contains more than 1000 emails, we will verify a maximum of 2 files at a time. Once there are less than 1000 emails left for verification in a file, we will start the verification of the next file automatically.  


Upload your file

You can upload your files for email verification on this page: https://app.millionverifier.com/email_verify#file-upload


  1. Upload your file in the Drag&Drop area. 
  2. We are only going to charge you for unique emails in your file.
  3. Start verifying your file.


4. You can see the progress of your file on the same page. 


5. You may stop the verification at any time using the stop button in the right top corner of the file's box.
If you stop the verification, you will get the results for the already verified emails, and all not-verified emails will be marked as unknown, and we refund your credits for those.



Download Results

As soon as your file verification is completed, you will be able to download the results from the very same page.


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