Base64 images to gmail

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I\'m generating some inline images for an email sent from the iPad. Looks great in all desktop email clients, but gmail doesn\'t seem to like the base64 image and it shows u

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耶瑟儿～

2020-11-28 07:20

The links from Moin Zaman show test results that are outdated (from 2008). As of my thorough testing today Gmail does support displaying embedded images for both methods.

Use base64 encoding image inline within <img src="...">

<html><body><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA9QAAADmCAIAAAC77FroAAAAAXNSR0IArs4c6QAAAAlwSFlzAAAO..."></body></html>

Use base64 encoded image as attachment

Message-ID: <BE0243A40B89D84DB342702BC5FD6D313EA3BE1B@BYMAIL.example.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-originating-ip: [xxx.xxx.xxx.xxx]

Content-Type: multipart/related;
    boundary="_038_BE0243A40B89D84DB342702BC5FD6D313EA3BE1BBYMAIL_";
    type="multipart/alternative"
MIME-Version: 1.0
Return-Path: email@example.com
X-OriginatorOrg: example.com

--_038_BE0243A40B89D84DB342702BC5FD6D313EA3BE1BBYMAIL_
Content-Type: multipart/alternative;
    boundary="_000_BE0243A40B89D84DB342702BC5FD6D313EA3BE1BBYMAIL_"

...skipping Content-Type: text/plain which would be here for this example...

--_000_BE0243A40B89D84DB342702BC5FD6D313EA3BE1BBYMAIL_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html><body><img border=3D"0" width=3D"980" height=3D"230" id=3D"Picture_x0020_1" src==3D"cid:image001.png@01CDA268.204677C0"></body></html>

--_000_BE0243A40B89D84DB342702BC5FD6D313EA3BE1BBYMAIL_--

--_038_BE0243A40B89D84DB342702BC5FD6D313EA3BE1BBYMAIL_
Content-Type: image/png; name="image001.png"
Content-Description: image001.png
Content-Disposition: inline; filename="image001.png"; size=32756;
    creation-date="Mon, 08 Oct 2012 15:27:07 GMT";
    modification-date="Mon, 08 Oct 2012 15:27:07 GMT";
Content-ID: <image001.png@01CDA268.204677C0>
Content-Transfer-Encoding: base64

iVBORw0KGgoAAAANSUhEUgAAA9QAAADmCAIAAAC77FroAAAAAXNSR0IArs4c6QAAAAlwSFlzAAAO
xAAADsQBlSsOGwAAf5lJREFUeF7tvQlgVdW18L+ZR20mpsSLCYlBQKwgwRCMr9TAqzg0CAl98Y9a
ikBfHxL1A/r0tUr77Feg1mDav4LUijxTk8hLRIstQ2mJhEiAWAEpNCGRa8KUSQXCzLf2cOZz7j33
5s5Zx6j3nruHtX97n33WWWfttbtdv36d4IEEkAASQAJIAAkgASSABJCA/wl0938VWAMSQAJIAAkg
ASSABJAAEkAClAAq3zgOkAASQAJIAAkgASSABJBAgAig8h0g0FgNEkACSAAJIAEkgASQABJA5RvH
...

To do your own testing, you can send email with inline embedded image using one of the following techniques

Using code by creating your own base64 image strings
Enable and use Google Lab for Inserting Images
Paste image into Email client like Outlook 2010

Send an email using one of the above to your Gmail account, then open the Email in Gmail Web Client (any browser that works) and use the Down-Arrow next to the Reply button to choose the Show Original option. This will show you how it is received.

I think best practice is to use the embedded image as attachment method.

In my testing with Gmail Web Client, if I sent 30 images in a single email of different sizes, a few would not load successfully showing image container but not the image. If that happens, try reloading the page.

In my testing (Windows 7)...

Chrome (latest) needed a couple of reloads to successfully load/show all 30 images
Opera (latest) wouldn't successfully show all 30 images regardless of number of reloads
Firefox (latest) consistently showed all 30 images without issue
Internet Explorer 9 (latest) consistently showed all 30 images without issue
Safari (latest) consistently showed all 30 images without issue

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