LinkedIn's help center lists these requirements for video ads: MP4, between 75 KB and 500 MB, three seconds to 30 minutes long (15 to 30 seconds recommended), a frame rate under 30 fps, H.264 or VP8, and captions as SRT. Resolution has a ceiling as well as a floor: 16:9 runs from 640 x 360 to 1920 x 1080, 9:16 from 360 x 640 to 1080 x 1920. That ceiling matters for AI video, because a 2K clip is above it and has to be scaled down on export.
TL;DR
| Spec | LinkedIn video ads |
|---|---|
| Format | MP4 (H.264 or VP8) |
| File size | 75 KB to 500 MB |
| Length | 3 s to 30 min; 15 to 30 s recommended; in-stream up to 90 s |
| Frame rate | under 30 fps |
| 16:9 | 640 x 360 to 1920 x 1080 |
| 1:1 | 360 x 360 to 1920 x 1920 |
| 4:5 | 360 x 450 to 1080 x 1350 |
| 9:16 | 360 x 640 to 1080 x 1920 |
| Captions | SRT file, text only |
From LinkedIn Help, "Video ads advertising specifications", checked 2026-09-29.
What AI video needs to change
2K is above the ceiling. Hailuo H3 delivers 2K on 8frame, larger than LinkedIn's 1920 x 1080 maximum for 16:9. Scale it to 1080p when you export. Veo 3.1 and Veo 3.1 Fast deliver 1080p and fit as they are.
4:5 is LinkedIn's in-between shape. Most video models on 8frame offer 16:9, 9:16, 1:1, 4:3 and 3:4, not 4:5. Generate 9:16 or 1:1 and crop to 4:5 in the edit, keeping the subject centred.
Check the frame rate on export. LinkedIn asks for under 30 fps. Confirm what your edit exports before uploading.
Captions are yours to make. LinkedIn takes an SRT file, and 8frame does not generate captions, so write or transcribe them separately.
Minimum length is 3 seconds. Every model on 8frame can generate at least that, and most ads land in LinkedIn's recommended 15 to 30 seconds by joining several clips: Merge Videos does that for 10 credits.
Which settings fit
| Model on 8frame | Output | Fits LinkedIn as is? |
|---|---|---|
| Veo 3.1, Veo 3.1 Fast | 1080p | Yes |
| Veo 3.1 Lite | 720p | Yes |
| Wan 3.0 | 480p to 1080p | Yes at 720p or 1080p; 480p is above the minimum but soft |
| Hailuo H3 | 2K | Scale down to 1080p first |
| Seedance 2.5, 2.0 | 480p or 720p | Yes |
Resolution per model is in AI video resolution by model. For choosing models for B2B video, see best AI video for LinkedIn.
FAQ
What size should a LinkedIn video ad be? 1920 x 1080 at most for 16:9, 1080 x 1920 at most for 9:16, 1080 x 1350 for 4:5 and 1920 x 1920 for square, per LinkedIn Help.
How long can a LinkedIn video ad be? 3 seconds to 30 minutes, with 15 to 30 seconds recommended. In-stream video ads can be up to 90 seconds.
What is the maximum file size for a LinkedIn video ad? 500 MB, with a minimum of 75 KB.
What frame rate does LinkedIn want? Under 30 fps.
Sources
- LinkedIn Help, "Video ads advertising specifications": MP4, 75 KB to 500 MB, 3 seconds to 30 minutes, 15 to 30 seconds recommended, in-stream up to 90 seconds, under 30 fps, H.264 or VP8, SRT captions, resolutions per aspect ratio: linkedin.com/help/lms/answer/a424737, fetched 2026-09-29
- 8frame resolutions and aspect ratios: the 8frame tool registry, 2026-09-29
Generate at 1080p or scale down to it, then add captions. The 8frame canvas is free and unlimited, and generation is paid from $19/month.