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Session Id : lw5ecpn1GLn051wRz1Se3s
Power Automate - General Discussion
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Max Base64 Size for Email Embed?

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Posted on 2 Mar 2021 23:24:13 by

Hello,

 

I'm hitting a wall here. Is there a max size for base64 strings when embedding them as image in an Email using Flow?

 

I'm able to get base64 into an <img src="data&colon;image/png;base64, <long_string_here>"/> tag in Flow, but the image does not appear in Outlook. The size of the image is ~875kb (~2.2M characters). Is there a limit published somewhere?

 

Thank you

  • JM-12092339-0 Profile Picture
    2 on 31 Mar 2025 at 15:38:38
    Max Base64 Size for Email Embed?
    Very late reply; but for anyone that comes across this: The limit is about ~4KB for a base64 encoded image. Anything else is truncated. 

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