Reddit Ads image specs
Reddit image ad specs: JPG, PNG or GIF up to 3 MB, recommended 1,440 × 1,080 pixels (4:3) across devices, carousels of 2–6 images up to 20 MB each.
All Reddit Ads image requirements
Source: Reddit Ads Help — Image Ad Specifications; Carousel Ad Specifications; Free-form Ad Specifications; Ad Unit Specifications. Checked 12 October 2026.
- Recommended
- Landscape 4:3 at 1,440 × 1,080 pixels is the recommended cross-device resolution for an image ad, so a single image serves multiple devices, placements and view modes
- Mobile
- Recommended resolutions are square 1:1 at 1,080 × 1,080, portrait 3:4 at 1,080 × 1,440, portrait 4:5 at 1,080 × 1,350, landscape 4:3 at 1,440 × 1,080 and landscape 16:9 at 1,920 × 1,080 pixels
- Desktop
- Recommended resolutions are 1,440 × 1,080 pixels and landscape 16:9 at 1,920 × 1,080 pixels
- Aspect ratio
- Any aspect ratio can be used, but it may cause formatting discrepancies such as letterboxing
- Formats
- JPG, PNG or GIF for image, carousel and free-form ad images; a GIF uploaded as a thumbnail is converted to a still image
- File size
- Maximum 3 MB for an image ad; in a carousel 20 MB per file and 3 MB for GIFs; maximum 10 MB for free-form ad images
- Number
- 1 image in an image ad, 2–6 images in a carousel ad and up to 20 images in a free-form ad
- Carousel
- Recommended across devices: portrait 4:5 at 1,200 × 1,500, landscape 4:3 at 1,440 × 1,080 or landscape 16:9 at 1,920 × 1,080 pixels; square 1:1 at 1,200 × 1,200 pixels is also listed for mobile; using the same aspect ratio for all images is strongly recommended
- Thumbnail
- Recommended landscape 4:3 at 400 × 300 pixels; square 1:1 at 300 × 300 and landscape 16:9 at 400 × 225 pixels are acceptable; maximum file size 3 MB; shown only in conversation placement and compact view
- Free-form images
- Recommended minimum width 1,000 pixels; recommended resolutions are 1,200 × 1,200, 1,440 × 1,080 and 1,920 × 1,080 pixels
What Reddit Ads asks for, covered.
Herofab's ad creative tool delivers a square at 2,048 × 2,048 pixels, a 4:5 portrait at 1,640 × 2,050 and a 16:9 banner at 2,048 × 1,152, each above the resolution Reddit recommends for that ratio. Herofab has no 4:3 ratio, the one Reddit recommends for a single image across devices; the 16:9 banner is its closest landscape format. An image ad is limited to 3 MB: a 2K PNG can weigh more, so the JPG download is the safer file.
Square, 4:5 and 16:9 covered
Ad creative delivers 2,048 × 2,048, 1,640 × 2,050 and 2,048 × 1,152 pixels, above the resolutions Reddit recommends for those ratios.
No 4:3 format
Reddit recommends 4:3 at 1,440 × 1,080 pixels across devices; Herofab has no 4:3 ratio, and 16:9 is its closest landscape format.
JPG under 3 MB
Herofab images can be downloaded as PNG or JPG; a 2K PNG can exceed the 3 MB limit.
Reddit Ads, answered.
What image size is right for Reddit Ads?
Reddit image ad specs: JPG, PNG or GIF up to 3 MB, recommended 1,440 × 1,080 pixels (4:3) across devices, carousels of 2–6 images up to 20 MB each.
Which image formats can be used for Reddit Ads?
JPG, PNG or GIF for image, carousel and free-form ad images; a GIF uploaded as a thumbnail is converted to a still image. Source: Reddit Ads Help — Image Ad Specifications; Carousel Ad Specifications; Free-form Ad Specifications; Ad Unit Specifications, checked 12 October 2026.
How large can an image file be for Reddit Ads?
Maximum 3 MB for an image ad; in a carousel 20 MB per file and 3 MB for GIFs; maximum 10 MB for free-form ad images. Source: Reddit Ads Help — Image Ad Specifications; Carousel Ad Specifications; Free-form Ad Specifications; Ad Unit Specifications, checked 12 October 2026.
How many images can be used in Reddit Ads?
1 image in an image ad, 2–6 images in a carousel ad and up to 20 images in a free-form ad. Source: Reddit Ads Help — Image Ad Specifications; Carousel Ad Specifications; Free-form Ad Specifications; Ad Unit Specifications, checked 12 October 2026.
Can I check my images before uploading?
Yes. The free image size checker reads each file in your browser and tests it against these rules; the image is not uploaded.
Where do these figures come from?
From Reddit Ads Help — Image Ad Specifications; Carousel Ad Specifications; Free-form Ad Specifications; Ad Unit Specifications, read on 12 October 2026. Platforms update their specs; the official page is the final reference.
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