The three big short-form placements share a core format, vertical video with sound, but differ in length limits, ad products and interface overlays. Build for vertical 9:16 first, keep key content inside the safe zone, design for sound without relying on it, and test variants of the opening rather than polishing one master. Platform rules are summarised below from official help pages as at November 2026, and they change, so check the live pages before you export.
What the platforms say, at the time of writing (November 2026)
TikTok
TikTok’s video ad specifications list 9:16 vertical as the recommended aspect ratio with a minimum of 540 by 960 pixels, with 16:9 (960 by 540 minimum) and 1:1 (640 by 640 minimum) also accepted. Standard ads can be MP4, MOV, MPEG, 3GP or AVI, up to 10 minutes and 500 MB, with a minimum bitrate of 516 kbps (TikTok Ads Help).
The same page explains that the safe zone depends on aspect ratio, caption length and any additional formats, and TikTok provides safe zone files for you to check against. It also describes Spark Ads, which are based on organic posts and pull the caption from the original video. Preview in Ads Manager, because TikTok notes the preview may differ slightly from the live version.
Instagram and Facebook Reels
Meta recommends vertical 9:16 for Reels ads, and says you can crop existing video in Ads Manager. It advises including audio, notes that Reels play with sound on by default, asks advertisers to keep key messages clear of the Reels interface and points to a Reels safe zone checker and the Meta Design Check app (Meta for Business). It also recommends a conversational, native style rather than repurposed feed content, and A/B testing Reels-optimised assets against existing creative.
Meta’s own page reports that campaigns using 9:16 video with audio and safe-zone messaging had 34.5% lower cost per result than image ads. That is Meta-reported testing, so treat it as directional rather than a promise. Meta’s safe zone figures are best taken from its own checker rather than from third-party blogs, which disagree with each other.
YouTube Shorts
For organic content, YouTube states that a video must have a square or vertical aspect ratio and be up to three minutes to be classed as a Short (YouTube Help).
For Shorts ads, Google recommends vertical video, notes that horizontal assets run with blurred bands, and says video ads can run up to 3 minutes but only the first 60 seconds play in the Shorts feed. It recommends keeping ads under 60 seconds and suggests 10 to 30 seconds for action-oriented ads. It advises vertical, sound-on creative that feels native, and says CTA buttons appear after 3 seconds in some campaign types and after 10 seconds in others (Google Ads Help).
Quick comparison
| Item | TikTok ads | Meta Reels ads | YouTube Shorts |
|---|---|---|---|
| Preferred ratio | 9:16 | 9:16 | Vertical or square |
| Sound | Check TikTok guidance | Include audio, sound on by default | Sound-on recommended |
| Length guidance | Up to 10 minutes technically | Check Video ads guide | Shorts up to 3 minutes; ads: first 60 s play in feed |
| Safe zone | Provided files per format | Safe zone checker | Not specified in the page opened |
Native creative conventions
All three platforms reward creative that looks like it belongs in the feed.
- Vertical from the first frame. Do not letterbox a horizontal ad.
- Lead with the human or the product in use. Faces, hands and movement draw the eye faster than logos.
- Conversational pacing. Direct address, voiceover with personality, text that reads like a caption.
- One message. The 15-second ad craft guide covers structure.
- Branding early but not as a sting. Show the product or name within the first seconds.
- Reuse creator formats, such as testimonials, demos and walkthroughs, but only when the claims are real and the people are genuine.
Hooks
Treat the hook as the first one to three seconds. Some formulas to test:
- Problem first: show the annoying moment the product solves.
- Result first: open on the end state, then rewind.
- Curiosity: an unusual object or action that begs a follow-up.
- Direct promise: one line of text with one visual.
- Pattern interrupt: a sudden sound or visual change in frame one.
Sound-off viewing and captions
Design for both modes. Meta and Google both recommend audio, but a viewer in a public or quiet setting may have sound off. Make the picture tell the story, use readable on-screen text within the safe zone, and add captions for spoken lines. Captions also help accessibility.
Testing variants
You will learn more from structured tests than from guessing.
- Pick one variable at a time: hook, first line, length, end card or call to action.
- Produce two to four variants that differ on only that variable.
- Run them under the same targeting and budget conditions.
- Judge on the metric tied to your goal, not only views. See measuring creative campaign performance.
- Keep the winner, brief the next test.
Variants are cheap when the production approach supports them. AI-generated or modular footage makes alternate openings easier to produce, but the accuracy checks in our AI product video guide still apply to each version.
Organic versus ad placements
An organic post builds a library of proven formats. A paid placement buys distribution and targeting. TikTok’s Spark Ads and Meta’s branded content options exist so that a post that works organically can be promoted (TikTok Ads Help; Meta for Business). A useful workflow is to publish organically first, learn which hooks hold attention, then promote the strongest.
Do not forget disclosure. Platforms have rules on realistic AI-generated content, and Australian advertising must not mislead. Our guide to the limitations of AI video covers both.
Pre-export checklist
- 9:16, correct resolution and file type for the placement.
- Key text and logo inside the safe zone.
- Hook within the first seconds.
- Captions on, picture works on mute.
- Sound mixed and licensed.
- Claims accurate and provable.
- At least two hook variants prepared.
- Platform AI-disclosure requirements checked.
Building a simple test plan
For a first campaign, a modest structure is enough. Produce one core idea, then make two different hooks and two different end cards. Run the combinations for long enough to compare like with like, and write down the result before you brief the next round. Resist changing several things at once, because you will not know which change mattered. Keep a log of each version, its placement and the date it ran, so that winning formats can be repeated.
Where Radiance Impact fits
Radiance Impact is a Brisbane-based creative technology studio, and its Studio produces short-form and social video, AI commercials, post-production, and voice and sound. For campaign planning and search or social strategy, its Growth division covers marketing. To discuss a short-form project, contact us or see the Studio page.
Sources
- Video ads specifications, TikTok Ads Help
- Instagram and Facebook Reels ads, Meta for Business
- Understand three-minute YouTube Shorts, YouTube Help
- YouTube Shorts ads: Asset specs and best practices, Google Ads Help
