# LinkedIn video ad specs

> LinkedIn video ads take MP4 files from 3 seconds to 30 minutes, up to 500 MB, in 4:5, 9:16, 16:9 or 1:1. Sizes, codec and caption rules, checked 3 Nov 2026.
- **Author**: Marxx
- **Published**: 2026-11-11
- **Category**: Ad specs
- **URL**: https://marxx.ai/library-guides/linkedin-video-ad-specs

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LinkedIn video ads are MP4 files from 3 seconds to 30 minutes and 75 KB to 500 MB (checked 3 Nov 2026). Ratios are 4:5, 9:16, 16:9 and 1:1, and LinkedIn recommends 15 to 30 seconds.

## Sizes by ratio

| Ratio | Minimum | Maximum |
|---|---|---|
| 4:5 (vertical) | 360 x 450 | 1080 x 1350 |
| 9:16 (vertical) | 360 x 640 | 1080 x 1920 |
| 16:9 (landscape) | 640 x 360 | 1920 x 1080 |
| 1:1 (square) | 360 x 360 | 1920 x 1920 |

Source: LinkedIn's [video ad specs page](https://business.linkedin.com/advertise/ads/sponsored-content/video-ads/specs). Tolerance is 5%. LinkedIn's help page adds recommended sizes: 4:5 at 720 x 900, 9:16 at 720 x 1280 and 16:9 at 1920 x 1080.

## File and length

| Item | LinkedIn says |
|---|---|
| File type | MP4 |
| File size | 75 KB to 500 MB |
| Length | 3 seconds to 30 minutes |
| Recommended length | 15 to 30 seconds |
| Video codec | H.264 or VP8 |
| Audio | AAC or MPEG4 |
| Upload | From desktop, as a file (no YouTube or Vimeo links) |

Videos under 30 seconds loop to 30 seconds of playback. Longer videos play once. In-stream video ads run up to 90 seconds. Apple ProRes is not supported. Campaign Manager allows 25 videos in 24 hours.

## Where the pages disagree

- **Frame rate.** The business page says the recommended rate is 30 fps. The help page says "less than 30 FPS".
- **Audio.** Both pages list "less than 64 KHz". Treat that as LinkedIn's wording and check your export.
- **Bitrate.** Neither page gives one.
- **Captions.** The help page says captions must be an SRT file, plain text only, with no font colours. The business page calls captions optional.
- **Safe zone.** LinkedIn gives no text-placement guidance.

## Text and thumbnail

Headline: 70 characters recommended, 200 maximum. Intro text: 150 recommended, 600 maximum. A thumbnail is optional: JPG or PNG, 2 MB maximum, same aspect ratio as the video.

## Set it up in Marxx

We make Marxx. [Marxx's AI video editor](/features/ai-video-editor) exports MP4 (H.264) up to 1080p and 30 fps, and exports captions as an SRT file. Projects can be 9:16, 1:1 or 16:9 (not 4:5), and exports run up to five minutes.

## A worked example

Say you have a 10-minute product demo. The 500 MB cap is 500 x 8 = 4,000 megabits. Spread over 600 seconds, that is 4,000 / 600 = about 6.7 Mbps. Export below that average rate, and the file fits. At 8 Mbps it would be 600 MB and fail.

To burn captions into the picture or use a file, see [open vs closed captions](/compare/open-captions-vs-closed-captions) and [how to add captions to video ads](/guides/how-to-add-captions-to-video-ads). The vertical ratio choice is covered in [9:16 vs 4:5 video ads](/compare/9-16-vs-4-5-video-ads), though that page is about Meta.

## FAQ

### What is the best size for a LinkedIn video ad?

LinkedIn's help page recommends 4:5 at 720 x 900 as the ratio to use. It also accepts 9:16, 16:9 and 1:1.

### How long should a LinkedIn video ad be?

LinkedIn recommends 15 to 30 seconds. The allowed range is 3 seconds to 30 minutes.

### Can I add captions to a LinkedIn video ad?

Yes. LinkedIn's help page says to upload an SRT file, as plain text.

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