Images
Add an image or a gallery of images to a page, add image variants for dark mode, and resize and align images to your needs
You can insert images into your page, then choose their size and whether to align them to the left, center, or right. You can also optionally include alt text and/or a caption on your image block.
Example of an image block
Uploading an image
There are two ways to add images to your content:
Drag and drop the image from your file management system directly into an empty block on your page.
Add an image block to your page and use the Select images side panel that appears on the right of the window.
If you follow the second process, you can choose to upload a file, select a previously-uploaded file, paste an image URL or add an image from Unsplash using the built-in search.
GitBook allows you to upload images up to 100MB per file.
Create an image gallery
Adding more than one image to an image block will create a gallery. To do this, open the block’s Options menu 
and choose Add images… to open the Select images side panel again.
To delete an image from a gallery, open the Actions menu 
on the image you want to delete and press the Delete ⌫ key.
Adding images for light & dark mode
You can set different images for the light and dark mode versions of your published site. GitBook will automatically display the correct image depending on the mode your visitor is in.
To add an image for dark mode, hover over your image, open the Actions menu and click Replace image 
.
In the drop-down menu, choose Add image for Dark mode. Once you’ve set this, you can replace either image from this same menu.
Note: GitBook doesn’t currently support light and dark mode images for certain cases, including page covers or image covers on cards.
Light and dark mode images through GitHub/GitLab Sync
You can also add light and dark mode images in Markdown through HTML syntax (<picture> and <source>).
For block images, use the <figure> HTML element with a <picture> and <source> in it:
For inline images (images that sit inline with text), use the <picture> HTML element with a <source> in it:
Note: We don’t yet support GitHub-only syntax through #gh-dark-mode-only or #gh-light-mode-only.
Resizing
To resize your image, hover over it and open the Actions menu . Click the Size button to change the size of your image from the available options.
Small – 25% of the image size
Medium – 50% of the image size
Large – 75% of the image size
Fit – Removes all size specifications and displays either at full size or capped at a maximum width of 735 pixels for larger images.
If your image is wider than the editor, GitBook will limit the image’s width to the editor’s width instead, and resizing will be based on this limit.
You can make image blocks span the full width of your window by clicking on the Options menu next to the block and choosing Full width.
Resizing images through Git Sync
If you want more control over the sizing of your image, you can specify the exact size using Markdown in GitHub or GitLab.
When we export an image, we use the HTML tag <img/>. As per the specifications, we can specify the dimensions of the image using the width and height attributes, which only accept values in pixels or a combination of a number and a % sign.
Valid variants for specifying the image dimensions are:
<img width="100" /> Sets the image to 100 pixels wide
<img width="100%" /> Sets the image to full size (although this will be limited by the editor)
Aligning images
By default, image blocks will show your image at its full size, aligned centrally.
To change the alignment of an image, open the block’s Options menu and choose the alignment you want. This will only affect images that are narrower than the editor, or images you’ve resized.
Representation in Markdown
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