Reporting & research on Shopify and ecommerce
Merchants search for the right image size for a Dawn slideshow but the section has no size field at all, and the eight settings that do exist decide crop and speed instead of pixels.
Most merchants typing “shopify slideshow image size dawn theme” into a search bar are looking for a number that does not exist in the section they are editing. Dawn’s sections/slideshow.liquid has 8 settings and 1 block type, and not one of those settings is a width or height in pixels for the uploaded image. What the section actually gives you is a set of choices about layout, timing and cropping behavior, and understanding those choices matters more than hunting for a dimension field that was never built.
Looking at the measured settings in sections/slideshow.liquid (Shopify/dawn, commit 258f00f, August 10, 2026), the list includes layout as a select with 2 variants, slide_height as a select with 4 variants, slider_visual as a select with 3 variants, auto_rotate as a checkbox, change_slides_speed as a range from 3 to 9 seconds in steps of 2, and image_behavior as a select with 2 variants. That is 6 named settings out of 8 total, and the remaining two round out the block. Nowhere in that list is there a field asking for an image width or height in pixels. slide_height controls the height of the slide container using preset options, not a number you type, and image_behavior controls how the image fills that container, again through preset choices rather than dimensions. So the honest answer to “what image size” is that Dawn’s slideshow was not built to take one.
Dawn’s sections/image-banner.liquid sits next to the slideshow section but is a different tool, with 12 settings and 3 block types compared to the slideshow’s 8 settings and 1 block type. It carries image and image_2 as separate image_picker fields, image_overlay_opacity as a range from 0 to 100 in steps of 10 percent, image_height as a select with 4 variants, image_behavior as a select with 4 variants, and desktop_content_position as a select with 9 variants. The image banner’s image_behavior has twice as many variants as the slideshow’s version of the same setting, 4 against 2, which means the banner section supports more cropping and scaling modes than the slideshow does. If a merchant needs precise control over how a single hero image sits and crops, the image banner section is the closer match, not the slideshow.
Horizon’s sections/slideshow.liquid (Shopify/horizon, commit 8b42ace, August 31, 2026) has 15 settings against Dawn’s 8, and one of them is full_frame_on_mobile, a checkbox with no equivalent anywhere in Dawn’s slideshow settings. Horizon also adds display_mode and section_width, both selects with 2 variants, plus slideshow_gap as a range from 0 to 30 pixels in steps of 1 and corner_radius as a range from 0 to 50 pixels in steps of 1. None of these four settings exist in Dawn’s slideshow as measured. The absence is the finding here, not a soft possibility: Dawn’s slideshow section, at commit 258f00f, has no mobile-specific frame setting, no gap control and no corner radius control, while Horizon’s does.
| Section | Theme | Settings | Block types | Notable image/mobile fields |
|---|---|---|---|---|
| slideshow.liquid | Dawn | 8 | 1 | slide_height (4), image_behavior (2), no mobile-specific field |
| image-banner.liquid | Dawn | 12 | 3 | image + image_2 pickers, image_behavior (4), overlay opacity 0-100 |
| slideshow.liquid | Horizon | 15 | 1 | full_frame_on_mobile checkbox, slideshow_gap 0-30px, corner_radius 0-50px |
| hero.liquid | Horizon | 36 | 8 | media_type_1/2 selects, image_1/2 pickers, video_1/2 fields |
The method here is straightforward: CrUX field data collected from real visitors in July 2026, not a lab test, run across the market and aggregated per theme. Against 247 themes with sufficient mobile data, the median share of stores passing all three Core Web Vitals metrics is 85.5%, with the best-performing theme at 98.6% and the worst at 46.1%. On desktop, against 199 themes with sufficient data, the median is 86.2%, the best theme reaches 99.2% and the worst falls to 30.3%. None of these numbers come from the slideshow section’s code, and no setting inside sections/slideshow.liquid or sections/image-banner.liquid will move a store from the 46.1% end of that mobile range toward the 98.6% end by itself. Image weight, image count per slide and overall theme performance carry more weight than any crop setting.
Across the aggregated market of 329 themes, the median price is $300 with a range of $100 to $500, and the average rating is 4.53 out of 5 across 308 themes with a median of 23 reviews per theme, so price and reputation alone will not tell a merchant how a slideshow section behaves once installed. Check the actual settings file for the theme under consideration, count how many image behavior variants it offers, and confirm whether a mobile-specific frame setting exists before assuming one does. Then look at the Core Web Vitals pass rate for that specific theme rather than the market median, since the range between 46.1% and 98.6% on mobile is wide enough to matter more than any slideshow crop choice.
Check the settings file of any theme before assuming an image size field exists, because Dawn’s slideshow section has none and its 8 settings control crop and timing instead. Compare the actual pass rates for the specific theme under consideration against the mobile median of 85.5% and desktop median of 86.2%, since that gap tells you more about real slideshow performance than any setting name ever will.
Dawn's slideshow section does not have an image size setting to fill in, so there is no single correct pixel number to type anywhere in its 8 settings. What you do control is slide_height, a select with 4 variants, and image_behavior, a select with 2 variants, which together decide how tall the slide box is and how the picture inside it gets cropped or scaled. If you upload an oversized image, image_behavior and slide_height are what decide how much of it shows, not a size field, because that field is not part of the section.
The section itself does not carry a mobile-only image size or a mobile-only frame setting the way Horizon's slideshow does with full_frame_on_mobile. Dawn's 8 settings include auto_rotate as a checkbox and change_slides_speed as a range from 3 to 9 seconds in steps of 2, both of which apply the same way regardless of device. The measurable mobile difference comes from Core Web Vitals data instead: the market median for stores passing all three metrics on mobile is 85.5% against 247 themes with sufficient data, versus 86.2% on desktop against 199 themes, so mobile performance lags slightly and that gap is real even though the slideshow section's own settings do not name mobile at all.
sections/image-banner.liquid has 12 settings and 3 block types, more than the slideshow's 8 settings and 1 block type. The image banner adds image and image_2 as separate image_picker fields, image_overlay_opacity as a range from 0 to 100 in steps of 10 percent, and desktop_content_position as a select with 9 variants, none of which the slideshow section carries. So the image banner gives finer per-image and per-position control while the slideshow is built for rotation and timing instead.
Horizon's sections/slideshow.liquid has 15 settings against Dawn's 8, both with 1 block type. Horizon adds display_mode and section_width as selects with 2 variants each, slideshow_gap as a range from 0 to 30 pixels in steps of 1, corner_radius as a range from 0 to 50 pixels in steps of 1, and full_frame_on_mobile as a checkbox, none of which exist in Dawn's version as measured in the Shopify/dawn commit 258f00f from August 10, 2026. That checkbox is the clearest sign Horizon was built with a separate mobile framing decision in mind, something Dawn's slideshow settings simply do not address.
Across the aggregated market of 329 themes, the median price is $300 with a range of $100 to $500, and the average rating is 4.53 out of 5 across 308 themes with a median of 23 reviews. None of that tells you what a slideshow section can do, so treat price and rating as a budget filter and check the actual section settings, listed above, before deciding whether a theme's slideshow fits the images you plan to run.