Body: <p>I have discovered through trial and error that plaintext (<em>e.g.</em>, <code>.txt</code>) files sent to Kindle have at least some support for markup.  I'm note sure where it happens, but if I email a plaintext file to my <strong>Send-to-Kindle</strong> eddress, some hints get interpreted:</p>
  <ul>
  <li>Text surrounded by <code>&lt;whitespace&gt;&lt;underscore&gt;...&lt;underscore&gt;</code> will be rendered on the Kindle as underlined.</li>
  <li>Text surrounded by single asterisks (<code>*</code>) will be rendered as italic.</li>
  </ul>
  <p>As an example, the following decorations in a plaintext file:</p>
  <pre><code>_this is underlined_
  
  *this is italicised*
  
  _*this is underlined and italicised*_
  </code></pre>
  <p>will be rendered on my Kindle as:</p>
  <blockquote>
  <p>this is underlined</p>
  <p><em>this is italicised</em></p>
  <p><em>this is underlined and italicised</em></p>
  </blockquote>
  <p>(except I can't do the underlining here on SE, apparently.)</p>
  <p>What I <em>haven't</em> found is any way to mark text as bold or 'heading' sizes.</p>
  <p>Are these even supported?</p>
  <p>Thanks!</p>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-10-14T06:53:27.307Z
Comments.Text: Here on SE, bold is done with double asterisks: * * **bold text** * * Of course, no spaces between them. In the past, slashes were the delimiters for italic text, but that convention is not so common these days.
Comments.UserDisplayName: virolino
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-10-14T06:57:28.580Z
Comments.Text: Here on SE, text becomes a headline if you "underline" it with at least one minus "-".
Comments.UserDisplayName: virolino
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-11-15T00:15:24.197Z
Comments.Text: Unfortunately, I'm talking about `.txt` files sent to and rendered in Amazon Kindle, not here on SE. :sad:
Comments.UserDisplayName: RoUS
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2022-11-15T07:09:15.757Z
Comments.Text: but did you tried the double asterisk? The conventions look similar. And a triple asterisk might be bold+italic. I do not have a kindle, I cannot test it.
Comments.UserDisplayName: virolino
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2023-01-04T07:40:56.567Z
Comments.Text: Yes, I believe I tried those, but I will verify again.  So far only italic has been markable.  I haven't tried including Unicode fragments (such as from https://YayText.com/ yet, either.  Thanks!
Comments.UserDisplayName: RoUS
Tags: <kindle><send-to-kindle><font-rendering>
Title: Uploading plain .txt to Kindle: marking bold, underline, and italics?
UserDisplayName: RoUS
ThreadText: # Uploading plain .txt to Kindle: marking bold, underline, and italics?
  
  (Asked by: username_0 on 2022-10-12)
  
  I have discovered through trial and error that plaintext (*e.g.*, `.txt`) files sent to Kindle have at least some support for markup. I'm note sure where it happens, but if I email a plaintext file to my **Send-to-Kindle** eddress, some hints get interpreted:
  
  * Text surrounded by `<whitespace><underscore>...<underscore>` will be rendered on the Kindle as underlined.
  * Text surrounded by single asterisks (`*`) will be rendered as italic.
  
  As an example, the following decorations in a plaintext file:
  
  ```
  _this is underlined_
  
  *this is italicised*
  
  _*this is underlined and italicised*_
  
  ```
  
  will be rendered on my Kindle as:
  
  > this is underlined
  >
  > *this is italicised*
  >
  > *this is underlined and italicised*
  
  (except I can't do the underlining here on SE, apparently.)
  
  What I *haven't* found is any way to mark text as bold or 'heading' sizes.
  
  Are these even supported?
  
  Thanks!
  
  **Tags:** kindle, send-to-kindle, font-rendering
  
  > **Comments:**
  > **username_1**: Here on SE, bold is done with double asterisks: * * **bold text** * * Of course, no spaces between them. In the past, slashes were the delimiters for italic text, but that convention is not so common these days.  
  > **username_1**: Here on SE, text becomes a headline if you "underline" it with at least one minus "-".  
  > **username_0**: Unfortunately, I'm talking about `.txt` files sent to and rendered in Amazon Kindle, not here on SE. :sad:  
  > **username_1**: but did you tried the double asterisk? The conventions look similar. And a triple asterisk might be bold+italic. I do not have a kindle, I cannot test it.  
  > **username_0**: Yes, I believe I tried those, but I will verify again.  So far only italic has been markable.  I haven't tried including Unicode fragments (such as from https://YayText.com/ yet, either.  Thanks!  
  
  ---
  
  ## 0 answers
  
  