Compress images for Mailchimp.
Drop your photos and download them under 1 MB, the file-size limit in Mailchimp'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 1 MB per image, saved as JPG
Limits come from each platform's own help pages, summarised in the guides (checked 24 September 2026).
What Mailchimp asks for.
Source: Mailchimp Help — Image Recommendations for Content Blocks; Use the Content Studio; Troubleshooting Images in Emails; Use Image Content Blocks in the New Builder; Upload, Add, and Edit Images in Emails and Landing Pages · checked 12 October 2026
Mailchimp email image sizes: 660–1,320 pixels wide in the new builder, 600–1,200 in the legacy builder, PNG, JPG or GIF, 1 MB maximum recommended.
- Limit used
- Under 1 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
- Images 660–1,320 pixels wide in the new builder and 600–1,200 pixels wide in the legacy builder; Mailchimp resizes an image to fit the content block it is added to
- File size
- A maximum of 1 MB per image is recommended; the content studio takes uploads of images up to 1 MB each and other file types up to 10 MB each
- Formats
- PNG, JPG or GIF, with PNG to maintain transparency; the content studio supports JPG, JPE, JPEG, GIF, PNG and BMP image files
Compressors by platform.
Compressing for Mailchimp, answered.
What is the image file-size limit on Mailchimp?
1 MB per image, according to the rules summarised in the Mailchimp guide. This tool saves each photo as a JPG under that size.
Is JPG accepted on Mailchimp?
Yes. The formats Mailchimp lists are PNG, JPEG, and GIF.
Does compressing for Mailchimp change the pixel size?
Only when lowering the quality is not enough to get under 1 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 Mailchimp Help — Image Recommendations for Content Blocks; Use the Content Studio; Troubleshooting Images in Emails; Use Image Content Blocks in the New Builder; Upload, Add, and Edit Images in Emails and Landing Pages, read on 12 October 2026. Marketplaces update their rules; the official page is the final reference.
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