A Facebook Reels ad is a full-screen 9:16 video that plays with sound on by default. Keep text and logos out of roughly the top 14% and bottom 35% of the frame, get the product on screen in the first second, and keep it to one idea. For product ads, 6–15 seconds is enough. Meta's own split tests found that 9:16 video with audio and key messages in the safe zone had a 34.5% lower cost per result than image ads on Reels. Start with Hyper Motion to stop the scroll and UGC or Review to build trust.
Where Facebook Reels ads show
Facebook Reels ads appear full-screen in the Reels feed, between organic reels, with your page name, the primary text and a call-to-action button laid over the bottom of the video. People swipe past them exactly as they swipe past any reel, which is why the first second carries most of the weight.
You get the placement in one of two ways:
- Advantage+ placements, which Meta recommends, include Facebook Reels automatically.
- Manual placements. Tick Facebook Reels yourself. Meta's guidance is to choose at least six placements, including both Facebook Reels and Instagram Reels.
The same 9:16 file runs on both Facebook and Instagram Reels, so one export covers both.
The spec sheet
| Facebook Reels ad | |
|---|---|
| Aspect ratio | 9:16 vertical (Meta's recommendation for Reels) |
| Resolution | Export at 1080 × 1920 or higher |
| File type | MP4 or MOV |
| Sound | On by default. Meta: "Reels default to Sound On" |
| Safe zone | Keep text and logos out of roughly the top 14%, bottom 35% and 6% each side |
| Length | No single recommended length on Meta's Reels page. 6–15 s works for product ads |
| Primary text | Only the first line or two show over the video, so put the point first |
The safe-zone percentages are the margins most spec guides work to. Meta doesn't print them on its Reels ads page, but it does publish safe-zone templates and checkers (Canva, Adobe Express, PowerPoint, Photoshop, Keynote). Run your final frame through one before you upload.
Never crop a 16:9 video down to 9:16 and call it done: a center crop usually cuts off the product or the presenter's hands. Make the video vertical from the start. Our 9:16 explainer shows why.
What Meta's own numbers say
Meta's Reels ads page publishes a few results worth knowing before you decide whether to bother with native vertical video:
- 34.5% lower cost per result than image ads. This is for Reels campaigns using 9:16 video with audio and key messages in the safe zone. It comes from a meta-analysis of 15 split tests of Reels-only campaigns across ecommerce, retail, CPG and small-business advertisers.
- 2× higher delivery to the Reels placement for campaigns with that kind of video.
- 5% lower cost per result and 11% higher conversion rate on average when native Reels creative from partners was added to a standard campaign. These come from 15 A/B tests run between May 2022 and April 2023.
These are Meta's figures, from Meta's tests, so treat them as direction rather than a forecast. The direction is clear, though: a still image or a cropped landscape video is leaving money on the table in this placement.
Safe zones: where our own examples break the rule
We checked the on-screen text in our own example videos, and most of them would collide with the Facebook Reels interface.
In this pet toy ad, the opening title "NEW TOY TEST" sits about 15% down the frame, just inside the top margin. But the mid-clip caption ("instant obsession") sits about three-quarters of the way down, and the end line ("Let them play") almost at the bottom. On Facebook Reels, both land under the ad's caption and CTA button. Our blender clips do the same: their captions sit 75–80% of the way down.
That's a TikTok habit. Low, centred captions are the native look there, but the Facebook Reels ad interface takes up more of the bottom of the screen. Two fixes:
- Move on-screen text into the upper-middle of the frame. When you write the prompt, say where the text goes, or leave text out of the video and add it in editing.
- Let the primary text carry the message and keep the video text-free, apart from a title in the top third.
How long should a Facebook Reels ad be?
Meta doesn't publish one number for Reels ads, and the honest answer is "as long as one idea takes". For a product, that's usually 6–15 seconds:
- 0–1 s: the product, or the problem it solves, is on screen. No logo intro.
- 1–3 s: the hook: a motion, a question, a reaction.
- 3–8 s: the proof: it working, it being worn, it being unboxed.
- Last 2 s: the payoff shot. Leave the CTA to Meta's button.
v4v Studio videos are up to 10 seconds, which covers that structure. For a longer demo or review, run two clips as separate ads rather than one long one. You'll learn which half people actually watch.
What to post: five formats that suit Reels
| Format | What it does | Use it when | Example |
|---|---|---|---|
| Hyper Motion | Fast, physical, product-hero motion | Cold audiences; products with a visual moment | Blender: fruit drops in, button, pour |
| UGC | A creator-style person holding and talking about the product | Trust purchases; under ~$100 | Blender in a kitchen, held to camera |
| Review | An opinion with a verdict | Considered purchases where people compare | Beginner telescope, "best beginner telescope?" |
| Unboxing | Packaging, reveal, first reaction | Gifts, jewelry, premium packaging | Gold pendant unboxing |
| TV Spot | Cinematic camera and light, no creator | Premium and high-price products | Furniture, watches, fragrance |
Run at least two of these per product, not two edits of the same one. A Hyper Motion version and a UGC version of the same product test different reasons to buy. Two Hyper Motion edits with different captions test almost nothing.
Design for sound on, survive sound off
Reels play with sound by default, so use it: a voiceover, a creator talking, or the product's own sound (a blender motor, a box opening, a zip). Meta's own test results above are for video with audio.
But people do watch muted, so check the ad with the sound off. If the product and the point aren't obvious from the picture plus one short line of text, it isn't finished.
A checklist before you publish
- 9:16, made vertical, not cropped from landscape.
- Product on screen by the first second.
- Text in the safe zone. Check against a template; nothing in the bottom third.
- Sound that adds something: voice or natural product sound, not just a generic track.
- One idea per ad.
- The first line of primary text carries the offer, because that's all people see.
- Placements: Advantage+, or manual with Facebook Reels and Instagram Reels both ticked.
- Two or three versions per product in different formats, so you're testing angles. Our creative testing guide covers how to read the results.
Making Reels-ready product videos with v4v
In Studio, paste a product page URL or upload product photos, pick a format and the 9:16 aspect ratio, and v4v writes the brief and generates the video, up to 10 seconds. On Shopify, the v4v app does the same from your product catalogue, with three free videos on install. To see what each format looks like on a real product, browse the examples or read our Facebook video ad examples breakdown.
Paste a product link. The brief builds itself.
Generate product videos, UGC-style ads and hooks in about 5 minutes.
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FAQs
What size should a Facebook Reels ad be?
Vertical 9:16, which Meta recommends for Reels ads. Export at 1080 x 1920 pixels or higher as MP4 or MOV, and keep key text and logos away from the top and bottom of the frame, where the Reels interface sits.
How long should a Facebook Reels ad be?
Meta's Reels ads page doesn't give one recommended length. For product ads, 6 to 15 seconds is usually enough: one idea, with the product on screen in the first second. v4v Studio videos are up to 10 seconds.
Do Facebook Reels ads play with sound?
Yes, by default. Meta says Reels default to sound on, and its tests found that 9:16 video ads with audio did better on Reels than image ads. Still design the ad so the product and the message work on mute.
Where should text go in a Facebook Reels ad?
Inside the safe zone. The margins most spec guides use are roughly the top 14%, the bottom 35% and 6% on each side. Meta publishes safe-zone templates for Canva, Adobe Express, PowerPoint, Photoshop and Keynote.
Can I run the same video on Instagram Reels?
Yes. Both placements take the same 9:16 video. Meta recommends Advantage+ placements, or at least six manual placements that include Facebook Reels and Instagram Reels.