Occasionally, issues occur with files becoming corrupt when uploading through FTP. When viewing the corrupted file through the browser, the following error will be thrown.

"This image can not be displayed because it contains errors"

This is typically caused by uploading files through FTP as ASCII file transfer type. The "ASCII transfer type" will transfer the files as regular text files. The "Binary transfer type" will transfer the data in binary mode which handles the files as binary data instead of text data. Setting your FTP client to Binary will prevent your files from becoming corrupted through ftp transit. Please see the following on how to switch your FTP program to Binary.

It's also been brought to our attention that another possible cause of file corruption during FTP transfers, could be from your local firewall. Please also check for any updates to your firewall software, and possibly restart your router as well, if switching your FTP client settings to binary doesn't work.

Changing your ftp program to binary transfer

You can change the transfer type in your ftp program to Binary. All FTP programs should have this functionality. The following steps will demonstrate how to change the transfer type from ASCII to Binary in Filezilla.

  1. Open your Filezilla ftp program.
  2. Settings in FileZillaSelect "Edit" and click "Settings" from the drop Box.
  3. Transfer settings FileZillaIn the "Select page:" box, under "Transfers", click "File Types".
  4. Binary radio button FileZillaIn the "Default transfer type" section, select the "Binary" radio button.

    Click OK.

    Now when you connect to your server with ftp, files will be treated as Binary files. This should prevent the files from becoming corrupted.

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n/a Points
2014-10-08 5:35 am
its fine
n/a Points
2014-10-23 8:05 am
Why if settings above are correct file is still corruption on destination server
13,552 Points
2014-10-23 11:23 am
Hello Philip,

Thank you for your question. We are happy to help, but will need some additional information.

Are you getting any errors?

You can enable logging in FileZilla, which can provide more details.
  1. Open fileZilla
  2. Go to Edit-->Settings
  3. In the File editing section, click Logging
  4. Check the Log to file box, and enter a file name.

You may want to try zipping the file first (to protect it from corruption), then uploading it via FTP. Then unzipping it once it is uploaded.

If you have any further questions, feel free to post them below.
Thank you,
n/a Points
2014-10-23 8:09 am

Although transfer setting in Filezilla, Winscp and MobaXterm were set to transfer a .mp4 file as binary to a remote server, and the file was transferred, it seemed to have been converted to ASCII.

How do I prevent this?

Could it be the setup of the remote server.


13,552 Points
2014-10-23 11:45 am
Hello Philip,

Thank you for your question. Transferring a file via binary, or ASCII should not convert the file in any way. It is just the means of transferring.

For example, it is like using Fedex, instead of UPS for shipping. In the end the package will be the same.

How are you viewing the file? Can you provide a link to it?

Thank you,
n/a Points
2015-01-23 2:20 pm


I have a couple of 1GB .mov file which after FTP download are damaged. Each stopps playing in the middle of the file.

Any advise how to fix it? Is it FTP settings which is causing it?



23,972 Points
2015-01-23 2:23 pm
Hello Megan,

Have you had any luck by switching to Binary transfer?

Kindest Regards,
Scott M

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