The platform is easy; the audience is plural
Drop a GIF into a Mailchimp image block and it ships with the animation intact. Mailchimp's image guidance trends around 1MB as of mid-2026, and there's no toggle to find or plan tier to unlock. That's the entire platform story.
The complication is arithmetic. A campaign to ten thousand subscribers renders ten thousand times: on Apple Mail, which animates happily; on Gmail, which animates behind Google's image proxy; and on some stubborn residue of classic desktop Outlook, the roughly 2007 to 2019 Word-engine builds that display exactly one frame. A campaign GIF is really two creatives sharing a file, the loop for most of the list and the still for the rest. Neither can be an afterthought, because you never learn which subscriber saw which.
The numbers a campaign GIF has to make
Hedge every figure, because platforms revise quietly, but as of mid-2026 the working targets look like this:
- Roughly 1MB, as a ceiling rather than a goal. Slow heroes get scrolled past, and total email weight factors into deliverability.
- About 600 to 640 pixels wide, the width most Mailchimp templates actually display. Extra width is invisible and expensive.
- 2 to 4 seconds of loop. One idea per GIF; the loop will restate it forever.
- 10 to 12 fps and 64 to 128 colors. At email dimensions the quality difference is mostly theoretical, and the savings aren't.
Adjacent hazard: Gmail clips messages whose HTML passes roughly 102KB, counting markup rather than images, and a clipped campaign hides everything below the line, unsubscribe link included. Lean template, working footer. The Gmail guide has the specifics.
Frame 1 moonlights as a static ad
Sort a consumer list by domain and you'll still find corporate addresses, and some of those open in frozen-frame Outlook. So the first frame needs the full pitch: product in view, offer readable, brand identifiable. A payoff that only exists at second three never reaches those readers. The Outlook guide explains which versions freeze and why.
Captions do the heavy lifting. Up to three text overlays fit on a GIF, and any caption left untimed spans the whole loop, frame 1 included. The clean style brings a color picker, so the type can sit in campaign colors rather than meme white, though the Impact-style option is right there when the list enjoys that register. Text only, no arrows or stickers, so let the footage do the pointing.
One image block, three products
The sequencing feature could have been designed for campaigns: up to ten clips in one GIF, hard cuts between them, each clip keeping its own trim and crop. Three colorways, or the before, the after, and a close-up of the stitching, in a single asset.
Inside Mailchimp that consolidation pays twice. One image block instead of three means less markup for Gmail's clip line to eat, one alt text to write, and one asset to swap when the campaign changes. A caption can even bridge the cuts, holding the sale headline steady while the products rotate underneath it. Fewer moving parts, fewer ways for a template refresh to break the campaign.
Convert the embargoed cut without it leaving the building
Launch footage is usually confidential right up to send day. Open What the GIF, drag the video in (mp4, mov, webm, the usual suspects), and the conversion executes on your computer rather than on a server. There's no account step, and the export arrives without a watermark. Behavior is identical on Mac, Windows, ChromeOS, and Linux. (It also means no staring at an upload bar at 5pm on send day.)
Trims land on exact frames here too, with the arrow keys shifting the cut point by single frames, so the loop opens precisely on the frame you chose for Outlook. Downscale, thin the frame rate and palette, and check the recalculating size figure until it clears the budget. If it won't, the shrink guide works the stubborn cases. The one upload in this whole workflow is the finished GIF entering Mailchimp.