Compress images for Reddit Ads.
Drop your photos and download them under 3 MB, the file-size limit in Reddit Ads's image rules. The quality is lowered first and the pixel dimensions only when needed; the photo is never cropped. It runs in your browser; nothing is uploaded.
Under 3 MB per image, saved as JPG
Limits come from each platform's own help pages, summarised in the guides (checked 24 September 2026).
What Reddit Ads asks for.
Source: Reddit Ads Help — Image Ad Specifications; Carousel Ad Specifications; Free-form Ad Specifications; Ad Unit Specifications · checked 12 October 2026
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.
- Limit used
- Under 3 MB per image, saved as JPG
- Pixels kept
- The rules checked here state no minimum pixel size, so the tool stops before the photo falls under a quarter of its original width.
- 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
- 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
Compressors by platform.
Compressing for Reddit Ads, answered.
What is the image file-size limit on Reddit Ads?
3 MB per image, according to the rules summarised in the Reddit Ads guide. This tool saves each photo as a JPG under that size.
Is JPG accepted on Reddit Ads?
Yes. The formats Reddit Ads lists are JPEG, PNG, and GIF.
Does compressing for Reddit Ads change the pixel size?
Only when lowering the quality is not enough to get under 3 MB. The rules checked here state no minimum pixel size, so the tool stops before the photo falls under a quarter of its original width.
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. Marketplaces update their rules; the official page is the final reference.
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