If you're prepping creative for Snapchat Discover ads, the short answer is: build vertical 9:16 video at 1080×1920, export as MP4 or MOV with H.264 compression, keep the file size well under Snapchat's published cap, and design the first few seconds to work with sound off. The rest of this guide covers every spec that matters, how Discover ads differ from other Snap placements, and a pre-upload checklist so your ad doesn't get bounced back or buried.
What are Snapchat Discover ads, exactly?
Snapchat Discover is the content feed where publishers and creators post Stories, shows, and episodic content. Ads inside Discover — sometimes labeled Snap Ads when they run in this placement — appear between Stories as a user taps or swipes through, taking up the full vertical screen just like the organic content around them. Because the ad looks and feels like the next Story in line, it needs to match the visual language of the feed: vertical, full-bleed, fast-paced, and built to survive a swipe-past in under a second.
This matters for your video ad specs for Snapchat Discover ads because the placement is unforgiving of anything that looks like a repurposed banner or a landscape video with black bars. The frame is the whole screen. Every pixel, caption, and logo placement needs to be designed for that full-screen vertical canvas from the start.
Core video ad specs for Snapchat Discover ads
These are the baseline technical specs to design against. Snapchat periodically revises exact caps on file size and duration, so treat the numbers below as the starting point to verify against the current ad specs page in Snapchat's ad manager before you export your final file.
| Spec | Recommended setting |
|---|---|
| Aspect ratio | 9:16 vertical (full screen, no letterboxing) |
| Resolution | 1080×1920 minimum; higher is fine as long as the aspect ratio stays 9:16 |
| File format | MP4 or MOV |
| Video codec | H.264 |
| Audio codec | AAC, stereo |
| Frame rate | 24–30 fps |
| File size | Keep it as small as quality allows; always confirm the current maximum in Snapchat's ad manager before upload |
| Duration | A few seconds up to a few minutes is technically possible; shorter, hook-led cuts are generally easier to test and iterate on |
| Captions | Burned-in word-level captions recommended since the feed can be viewed with sound off |
Two details trip people up more than anything else. First, resolution below 1080×1920 can get upscaled by the platform and come out soft, so don't export at a lower size to save on file weight — compress the bitrate instead. Second, MOV files with unusual codecs (ProRes, HEVC in some containers) sometimes fail validation even though the extension looks right. If your export tool gives you the option, choose a standard H.264 MP4 and you'll avoid most rejection issues.
Duration and pacing: how long should a Discover ad actually be?
Snapchat's technical duration ceiling is generous, but a generous ceiling isn't a creative target. Discover ads sit inside a feed built for quick swipes between short Stories, so a video that takes too long to state its point risks being skipped before the offer ever lands.
A practical approach:
- Open with a visual hook in the first one to two seconds — a product in motion, a bold claim on screen, or a before/after cut. Don't open on a logo or a slow fade.
- State the core benefit by around the five-second mark, in on-screen text as well as voice, so the message survives on mute.
- Keep the whole ad as tight as the story allows — test a 10–15 second cut against a longer 20–30 second version for the same product and compare which one earns more completed views.
- End on a clear, single call to action rather than stacking several offers at once.
If you're also running the same creative on other vertical placements, a 30-second master cut is a reasonable default length to produce once and then trim down for Discover, since it gives you enough footage to edit a shorter version without reshooting. This is the same approach covered in our guide to video ad specs for Instagram Reels ads, where the vertical canvas and attention economics are similar.
Safe zones, captions, and sound design
Discover ads share screen space with Snapchat's own interface — swipe-up prompts, the Snap score, and other UI elements sit near the top and bottom edges. Keep your most important visual information (logo, key text, product shot) inside the middle 80% or so of the frame vertically, and avoid placing critical text right at the very top or bottom edge where it can be cropped or obscured.
Because viewers may land in Discover with sound off, design your ad so it works in silence:
- Add burned-in captions for any spoken line, not just a subtitle track that depends on the platform turning it on.
- Lead with on-screen text for your main claim rather than relying on voiceover alone to carry the message.
- Use motion, color change, or a quick cut to signal the moment the offer or call to action appears, so it registers even without audio cues.
- If you do add a voiceover and music, keep the mix clean — a cluttered audio track that fights the captions makes the ad harder to follow even for viewers with sound on.
Snapchat Discover ads vs other Snap video formats
Discover isn't the only place Snap video ads run, and the spec sheet is close to identical across placements — the real differences are in context and pacing expectations. Here's how Discover compares to the other common vertical Snap formats:
| Format | Where it appears | Typical pacing | Best use |
|---|---|---|---|
| Discover ads (Snap Ads in Discover) | Between Stories in the Discover feed, full screen | Fast, swipe-tolerant; front-load the hook | Broad awareness and direct-response offers shown alongside publisher content |
| Story Ads | A sponsored tile within the Discover/Stories rail that users tap into | Slightly longer attention span once tapped in | Multi-snap narratives, product demos, or sequences with more than one beat |
| Commercials | Non-skippable placement inside premium Snapchat content | Short and focused, no long setup | Brand messages that need guaranteed, uninterrupted viewing |
| Collection/Dynamic ads | Full screen with a product carousel layered on top | Fast hook plus a scrollable catalog | Retail and e-commerce with multiple SKUs to showcase |
The underlying video file specs stay close to 9:16, 1080×1920, MP4/H.264 across all of these — what changes is how much room you have to tell a longer story versus how hard you need to work in the first second. If you're also buying across Meta or Google surfaces with the same creative, it's worth comparing notes against our guides on video ad specs for Meta Advantage+ ads and video ad specs for Google Demand Gen ads, since the vertical-first logic repeats across most modern ad surfaces.
Common mistakes that get Discover video ads rejected or ignored
- Uploading horizontal or square video and letting the platform letterbox it — this leaves dead space on screen and signals the ad wasn't made for the feed.
- Shipping a file with low source resolution that gets stretched to fill 1080×1920, resulting in visible softness or pixelation.
- Relying entirely on voiceover with no on-screen text, so the message is lost for anyone watching muted.
- Placing the logo, price, or call-to-action text too close to the top or bottom edge where UI elements can crowd it.
- Using a file format or codec combination that technically plays locally but fails validation in the ad manager — stick to standard MP4/H.264/AAC.
- Building one long, slow-building story with no reason to keep watching past the first few seconds.
A pre-flight checklist before you upload
- Confirmed aspect ratio is 9:16 with no letterboxing or pillarboxing.
- Resolution is at least 1080×1920 and the source footage was shot or exported vertically, not cropped from horizontal.
- File is MP4 or MOV with H.264 video and AAC audio.
- File size checked against the current limit listed in Snapchat's ad manager.
- Captions burned in for every spoken line.
- Key text and logo sit clear of the top and bottom safe-zone margins.
- Hook and main benefit both land in the first few seconds, before any swipe-past is likely.
- A single, clear call to action appears near the end.
Where FrameNotion fits
If you need a Discover-ready ad without building it shot by shot, FrameNotion can shortcut most of the checklist above. Paste a product or website link into FrameNotion and FrameNotion AI writes and renders a 30-second vertical ad at 1080×1920 — the exact resolution and aspect ratio Discover placements expect — complete with a hook, problem, benefit, proof, offer, and call to action structured the way a feed ad needs to be paced. Every ad ships with word-by-word captions baked in, so it's built to work on mute by default, and it also comes bundled as 4:5, 1:1, and 16:9 if you want to repurpose the same creative elsewhere.
You can trim the 30-second master down to a tighter Discover cut, or request edits to text and color without starting a new ad from scratch. FrameNotion doesn't publish directly to Snapchat's ad manager or report on ad performance — you'll still upload the finished MP4 yourself and track results in Snapchat's own tools — but it removes the production bottleneck of getting a properly specced vertical file ready to test. See sample output on the examples page, or check pricing if you want to start with the free first ad.
Final word
Snapchat Discover ads reward creative that respects the feed it lives in: full-screen vertical, fast to the point, legible on mute, and clean enough technically to pass validation on the first try. Get the resolution, format, and safe zones right, then spend your actual creative energy on the hook and the offer — that's what decides whether someone keeps watching or swipes past.
Frequently asked questions
Does a Snapchat Discover ad need to be exactly 9:16?+
Yes, the placement is full screen and vertical, so 9:16 at 1080×1920 or higher is the safe target. Horizontal or square video gets letterboxed, which looks out of place next to the Stories around it.
Can I reuse a TikTok or Reels video for Snapchat Discover?+
Often yes, since most short vertical ad formats share a similar 9:16 canvas. Check resolution and captions match, and confirm the file format and codec against Snapchat's current spec page, since platforms accept slightly different container and codec combinations.
What file format does Snapchat's ad manager accept for Discover ads?+
MP4 and MOV are the standard choices, with H.264 video compression and AAC audio. Unusual codecs inside a MOV wrapper can fail validation even if the file plays fine locally, so standard H.264 MP4 is the safer default.
How long should a Snapchat Discover video ad be?+
There's technically a generous duration ceiling, but shorter, hook-led cuts tend to hold attention better in a feed built for quick swipes. A reasonable approach is to build a 30-second master and test a trimmed 10-15 second version against it.
Do captions matter for Snapchat Discover ads?+
Yes. Since viewers may be scrolling with sound off, burned-in captions and on-screen text for your main claim help the message land even in silence, rather than relying on voiceover alone.