How to add emoji in Marketo email subject line? Did Marketo support for all browsers and mobile versions.

I don't know of a native way in Marketo to do it if there is one, but you can literally copy/paste Emojis into your subject line from websites like https://getemoji.com 

HOWEVER --- I do NOT fully know the implications from a support perspective. Things like Outlook, Apple Mail, etc., may interpret and render the unicode value of the emoji differently so I would definitely test heavily and/or see if there are any resources online that can better outline how emojis are supported by email browers and OSes.

I would guess you'll be ok, but would absolutely do some quality testing with litmus or email on acid or something to properly understand the scenarios. 

We use this method - works great!

https://blog.teknkl.com/yes-you-can-use-emojis-in-marketo-subject-lines/ 

I also use the subject line assistant: Subject Line Assistant  (I thought I got this from Sanford's post but maybe not)

You can copy an emoji from just about anywhere and paste what you want (emoji included) for the subject line into that assistant to get the code you'll need to put into Marketo!

For example:

I Marketo

paste that into SLA and you get

=?utf-8?Q?I_=E2=9D=A4=EF=B8=8FMarketo?=

It works well! Still, of course, test, but I haven't seen many issues since using it!

Good places to get emojis:

https://emojipedia.org/ 

Full Emoji List, v12.1 

The subject line assistant website isn't working anymore -  we used this method for years! Does anyone have a solution??

I wanted to share this in case someone else runs into the issue I was having. I was using @sanfordwhiteman awesome Q-encoder and pasting the code into my subject line before some additional subject line text. While testing, the emoji kept showing up as the full code vs the emoji. I played around with it some more and realized my text had an apostrophe that was causing the issue - probably because it was copied over from a Word doc. When I deleted the apostrophe and re-typed it directly into the subject line editor it seemed to fix the issue. 

Example:

=?UTF-8?Q?=F0=9F=93=96?= XYZ’s Communication & Engagement Archive

Deleting and re-typing the red apostrophe allowed the emoji to render correctly in the email client.