> Quick answer: Keep your Facebook video ad between 5 and 15 seconds. Use MP4 or MOV with H.264 codec, a 4:5 or 9:16 aspect ratio, and design every frame for silent viewing. Here's exactly how to do it.
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Why Short Video Ads Work on Facebook
Short videos earn attention before the feed moves on. Your window is narrow, so every second counts.
Engagement and completion rates
Per Meta's video ad documentation, shorter videos deliver higher completion rates. Ads 30 seconds or longer can be skipped on eligible placements. Keep it under 15 seconds and most viewers finish it.
Auto-play advantages
Videos auto-play in Facebook Feed without sound. The first frame does the heavy lifting. Motion catches the eye. A strong visual hook holds the viewer.
Mobile-first viewing behavior
Most Facebook users scroll on mobile. Vertical formats fill the screen. Horizontal formats feel small by comparison. Match your creative to how people actually watch.
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Video Specs: Duration, Dimensions, and Format
Get the specs right and your ad looks native. Get them wrong and Meta crops your video automatically.
Ideal length: 5-15 seconds
Facebook recommends 5-15 seconds for optimal engagement and completion rates. The minimum is 5 seconds. In-stream ads are limited to 30 seconds.
Aspect ratios by placement
Per the Facebook Business Help Center's guidance on aspect ratios across placements:
- 1:1 (square): Works across Feed and Marketplace universally.
- 4:5 (vertical): Best performer for Facebook Feed.
- 9:16 (full vertical): Required for Stories and Reels.
Native aspect ratios always outperform auto-cropped versions. Choose the right one for each placement.
Resolution and file format requirements (MP4/MOV, H.264)
Per Meta's video quality optimization documentation, use MP4 or MOV with H.264 video codec and AAC audio. Minimum resolution is 720p. Recommended resolutions: 1080x1080px for 1:1 square, 1080x1350px for 4:5 vertical. Video width must be divisible by 16px for optimal playback.
File size and codec best practices
The file size limit is 1 GB. Export with H.264 codec and AAC audio. Tools like Final Cut Pro or iMovie export cleanly to these specs with custom settings.
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Step-by-Step: Create Your Short Video Ad
Prepare your video (specs checklist)
Before you upload, confirm:
- Format: MP4 or MOV
- Codec: H.264 video, AAC audio
- Resolution: 1080x1350px (4:5) or 1080x1080px (1:1)
- Duration: 5-15 seconds
- File size: Under 1 GB
Upload to Ads Manager
Open Meta Ads Manager and create a new campaign. Select your objective. At the ad level, choose "Single video" as your format. Upload your file directly from your device.
Add text overlays and captions
Meta's native text overlay tool lets you customize text style, position, and duration inside the ad creation flow. Add your hook as a text overlay. Add captions so silent viewers follow along. Both are built into Ads Manager.
Design for silent viewing
Most Facebook videos play without sound by default. Use motion, on-screen text, and visual storytelling. Never rely on dialogue or voiceover alone to carry the message.
Set thumbnail and preview
Choose a thumbnail that represents your hook frame. Meta lets you upload a custom thumbnail if the auto-selected frames miss the mark. Avoid blurry or off-brand frames.
Choose placements and audience
Use Advantage+ placements for broad distribution. Or manually select Feed, Stories, and Reels and match your aspect ratio to each placement. Set your audience targeting at the ad set level before publishing.
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Pro Tips for High-Performing Short Ads
Hook in first 3 seconds
Show the product. Show a result. Ask a sharp question. The first 3 seconds decide whether someone keeps watching or scrolls past.
Include captions and text overlays
Captions aren't optional. They're required for silent-scroll audiences and reinforce your message when sound is on.
Test multiple aspect ratios
Run 1:1 and 4:5 in the same campaign. Let the data show which placement wins. Don't guess.
Use brand-consistent messaging
Consistent fonts, colors, and tone build recognition across every view. Every frame should look and sound like your brand.
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Faster: Generate Video Ad Variations with AI
Why 3-5 variations accelerate learning
Testing one ad teaches you little. Testing three to five reveals which hook, format, or message resonates. More variations mean faster optimization.
Using Coinis Image Ads to source and iterate creative quickly
Coinis Image Ads generates high-quality ad creatives from a product URL. Input your URL. Choose your format. Get multiple on-brand variations in seconds. Use those as video ad stills, motion backdrops, or static fallback creatives. No production budget required to start testing.
Pairing AI-generated images with your video workflow
Run your campaign in Ads Manager. Use Coinis to generate the creative variations. Feed them into your video workflow. Brand Profile learns your visual identity and applies it automatically to every new creative you generate, keeping every variation consistent.
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Or let Coinis do it.
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Frequently Asked Questions
How long should a Facebook video ad be?
Facebook recommends 5-15 seconds for optimal engagement and completion rates. In-stream video ads are capped at 30 seconds, and ads 30 seconds or longer can be skipped by viewers on eligible placements.
What video format does Facebook require for ads?
Facebook requires MP4 or MOV files with H.264 video codec and AAC audio. Minimum resolution is 720p, with 1080p recommended. File size must be under 1 GB. Video width must be divisible by 16px for optimal playback.
What aspect ratio is best for Facebook video ads?
Use 4:5 vertical (1080x1350px) for Facebook Feed, 9:16 for Stories and Reels, and 1:1 square (1080x1080px) for universal placement compatibility. Native aspect ratios always outperform auto-cropped versions.
Do Facebook video ads need sound?
No. Videos auto-play without sound in Facebook Feed. Always design for silent viewing using captions, text overlays, and strong visual motion. Do not rely on voiceover or dialogue to carry your message.