Markdown is a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid HTML.

Sketchfab supports Markdown in model descriptions and Annotations.

Here's an example.

Primary Markdown Syntax

These are the features most relevant to Sketchfab models.



Will produce

Sketchfab logo

Optionally, you can add alt text and a title (important for SEO and accessibility), like this:

![Alt text]( "Title")

This is [an example]( "Title") inline link.
[This link]( has no title attribute.

This is [an example][id] reference-style link.

Other stuff goes here...

[id]:  "Optional Title Here"

Will produce an example link.


*single asterisks*
_single underscores_

Will produce italic text

**double asterisks**
__double underscores__

Will produce bold text


This is an H1

This is an H2

# This is an H1

## This is an H2

###### This is an H6

Will produce H1 headers

Will produce H2 headers

Will produce H3 headers

Will produce H4 headers

Will produce H5 headers
Will produce H6 headers



* Red
* Green
+ Blue
- Yellow 

Will produce

  • Red
  • Green
  • Blue
  • Yellow


1. First item
2. Second item
1. Third item
(The number before the period has no effect on the actual order, it just needs to be a number)

Will produce

  1. First item
  2. Second item
  3. Third item

Other Markdown Syntax

A lot of other Markdown features are supported, but they may not be very useful in the context of Sketchfab models. See this documentation for details:

It's also supported in Help Center comments, although the implementation may not be identical.

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    Is there any way to adjust the size of images shown in annotations? As I read through the documentation of Markdown I couldn't find such options, but would be happy to know any tricks. 

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    @yshaya - Not at the moment, images will fill with width.

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    This is great to learn! Is it possible to have links and images in the same annotation?

    EDIT: Answered my own question! You can add links, images and plain text in annotation, just watch out for 256 character limit (hint: url shorteners help)

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    @bematrix - Yep! Glad you figured it out :)

    You can also combine the different markdown items together, for example, an image that is a link:


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    I've thought it would be cool to have one click “Zoom out / Zoom in” function for the images shown in annotations.

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    Hi, has there been any progress in adjusting the sizes of images within annotations, or adjusting the sizes of annotation boxes so that larger images can show up using Markdown? We're interested in making the pictures larger for anatomical atlases such as at this page: Thanks


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    Hi @holliday,

    I'm afraid there's been no progress on that feature yet. As above, you can create a link to the full version as a workaround.

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    Hi, we're trying to call a functions on the page when the user clicks on an embedded image, like the second notation here:

    Normally markdown allows javascript code, like this:

    [markdown link](javascript:alert("foo");)

    I'm guessing this is not permitted in your markdown? Thanks.

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    Hi @jwillow

    Sorry, that's correct. JavaScript is not permitted in our Markdown implementation. It would represent to great a security risk.