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I couldn't get it working. Base64 is accepted at the time of creating signature & the image also displays in compose window, but recipient of email do not see any image.

gmail_signature But it will be helpful as currently images in Gmail Signature can be only referred by URLs. So base64 image format is an option but not sure if its supported.

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migrated from Jan 24 '12 at 12:06

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i would yell at gmail for showing such garbage at the end of my mails .. thus: i doubt that it will work (too much client-diversification to be reliable) – akira Jan 24 '12 at 12:24
@akira You don't get any "garbage" in your email. The picture in the original post above is of the base64 code but the html rendering engines in the browsers and email clients will display it as the image that it represents. – BGM Oct 7 at 2:20

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What you are asking for is clearly not-at-all possible and not-at-all constructive for GMail at all.

You can manually add an image at the end of the message though.

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I don't agree with "not constructive". You can use base64 within html and you end up with the image being embedded in the code rather than existing as a file. You can use base64 in emails within regular email clients. However, I agree that it seems you can't do it in gmail because there is no way to insert html directly (or doesn't seem to be; I actually came here looking for a way to do just this). – BGM Oct 7 at 2:18

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