--- title: "Mailchimp image compressor: under 1 MB, free | Herofab" description: "Compress product photos under the 1 MB limit of Mailchimp. Saved as JPG, never cropped. Free, in your browser; nothing is uploaded." url: https://herofab.app/tools/mailchimp-image-compressor language: en updated: 2026-10-12 --- # 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. ![Black-dial watch with a mesh strap on white, three-quarter view](https://herofab.app/img/ex/watch-packshot-1100.webp) Made with Herofab · Packshot studio ## Under 1 MB per image, saved as JPG Limits come from each platform's own help pages, summarised in the [guides](https://herofab.app/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](https://mailchimp.com/help/image-requirements-for-templates/) · 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 [Mailchimp image guide](https://herofab.app/guides/mailchimp-email-image-size) · [Image compressor](https://herofab.app/tools/image-compressor) ## Compressors by platform. [Walmart](https://herofab.app/tools/walmart-image-compressor) · [Shopee](https://herofab.app/tools/shopee-image-compressor) · [Cdiscount](https://herofab.app/tools/cdiscount-image-compressor) · [Ricardo](https://herofab.app/tools/ricardo-image-compressor) · [Heureka](https://herofab.app/tools/heureka-image-compressor) · [Miinto](https://herofab.app/tools/miinto-image-compressor) · [Google Ads](https://herofab.app/tools/google-ads-image-compressor) · [Amazon A+ Content](https://herofab.app/tools/amazon-a-content-image-compressor) · [Amazon Brand Store](https://herofab.app/tools/amazon-brand-store-image-compressor) · [LinkedIn ads](https://herofab.app/tools/linkedin-ads-image-compressor) · [Snapchat ads](https://herofab.app/tools/snapchat-ads-image-compressor) · [Google Business Profile](https://herofab.app/tools/google-business-profile-image-compressor) · [Temu](https://herofab.app/tools/temu-image-compressor) · [Newegg](https://herofab.app/tools/newegg-image-compressor) · [Webflow](https://herofab.app/tools/webflow-image-compressor) · [Amazon Ads](https://herofab.app/tools/amazon-ads-image-compressor) · [Reddit Ads](https://herofab.app/tools/reddit-ads-image-compressor) · [Wolf & Badger](https://herofab.app/tools/wolf-badger-image-compressor) · [THE ICONIC](https://herofab.app/tools/the-iconic-image-compressor) · [Trade Me](https://herofab.app/tools/trade-me-image-compressor) · [SHEIN](https://herofab.app/tools/shein-image-compressor) · [AliExpress](https://herofab.app/tools/aliexpress-image-compressor) · [Folksy](https://herofab.app/tools/folksy-image-compressor) · [ZALORA](https://herofab.app/tools/zalora-image-compressor) · [Taboola](https://herofab.app/tools/taboola-image-compressor) · [Outbrain](https://herofab.app/tools/outbrain-image-compressor) · [Omnisend](https://herofab.app/tools/omnisend-image-compressor) ## 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](https://mailchimp.com/help/image-requirements-for-templates/) is the final reference.