> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ahaslides.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Upload Image Guidelines for AhaSlides

> Image upload guidelines for AhaSlides: supported formats, maximum file size, recommended dimensions and aspect ratio, resolution limits, and how images are compressed after upload.

For the best image quality on AhaSlides, follow the guidelines below.

## Supported Image Formats

AhaSlides supports JPEG, PNG, and GIF images. After upload, images are automatically optimised and converted to .webm format to improve performance and playback speed.

## Maximum File Size

The maximum upload file size is 15 MB.

## Image Dimensions and Aspect Ratio

Images look best when their aspect ratio closely matches your presentation screen ratio. The standard screen ratios are:

* **16:9**, the most common
* **4:3**

You can use other dimensions, but matching your presentation ratio gives the best visual results.

## Resolution Recommendations

For full-screen background images, use 2K resolution (2560 x 1440). This keeps the display sharp while maintaining smooth performance, even on large screens or projectors. The maximum supported resolution after processing is 2560 x 1440 (2K).

<Note>
  Original-quality background rendering is not supported.
</Note>

## Image Compression and Quality

All uploaded images are automatically optimised to keep presentations running smoothly. There is no option to disable compression or preserve original quality after upload.

## Presentation Rendering

During playback, presentations are rendered locally on the presenter's device rather than streamed from AhaSlides servers. This helps keep performance stable and responsive during live sessions.

## Frequently Asked Questions

<AccordionGroup>
  <Accordion title="Which image formats does AhaSlides support?">
    AhaSlides supports JPEG, PNG, and GIF images. After upload, images are automatically optimised and converted to .webm format to improve performance.
  </Accordion>

  <Accordion title="What is the maximum image upload size on AhaSlides?">
    The maximum upload file size is 15 MB.
  </Accordion>

  <Accordion title="What resolution should I use for a full-screen background image?">
    Use 2K resolution (2560 x 1440), which is also the maximum supported resolution after processing. This keeps the display sharp while maintaining smooth performance on large screens and projectors.
  </Accordion>

  <Accordion title="What aspect ratio works best for AhaSlides images?">
    Images look best when their aspect ratio closely matches your presentation screen ratio, most commonly 16:9 or 4:3. Other dimensions work, but matching your presentation ratio gives the best visual results.
  </Accordion>

  <Accordion title="Can I keep the original quality of my uploaded images?">
    No. All uploaded images are automatically compressed and optimised, and there is no option to disable compression or preserve original quality after upload.
  </Accordion>
</AccordionGroup>


## Related topics

- [How to Create a Pin on Image Slide in AhaSlides](/using-slide-types/using-the-pin-on-image-slide.md)
- [How to Use and Create a Presentation Theme in AhaSlides](/branding/design-your-theme-on-ahaslides.md)
- [How to Create and Edit a Content Slide in AhaSlides](/using-slide-types/using-the-content-slide.md)
- [Sharing Images with Open-Ended Slide](/presenting/sharing-images-with-open-ended-slide.md)
- [Removing and Changing the AhaSlides Logo](/branding/removing-and-changing-the-logo.md)