LinkedIn Video Ad Specs: Sizes, File Limits and Text Lengths
LinkedIn video ads must be MP4 files between 75 KB and 500 MB, running 3 seconds to 30 minutes, with AAC or MPEG4 sound. LinkedIn accepts 4 ratios: 4:5, 9:16, 16:9 and 1:1, at up to 1080 x 1350, 1080 x 1920, 1920 x 1080 and 1920 x 1920 pixels. Keep the headline to 70 characters (200 maximum) and the introductory text to 150 characters (600 maximum).
Checked October 2026. Sources are listed at the end of the page.
A LinkedIn video ad is a video that plays in the LinkedIn feed as Sponsored Content, with introductory text above it, a headline below it and a call to action button. LinkedIn rejects or crops a video that misses its technical rules, so it pays to check the file before you upload it to Campaign Manager. This guide lists every spec on LinkedIn's own video ad specs page: file type, file size, length, sound, pixel sizes for each ratio, the thumbnail, the text lengths and the call to action options. After the table you get a short checklist for making a file that passes on the first upload.
| Spec | Requirement | Notes |
|---|---|---|
| File type | MP4 | The only video file type listed. |
| File size | 75 KB minimum, 500 MB maximum | Very short or very heavy files are refused. |
| Length | 3 seconds to 30 minutes | The full range LinkedIn accepts. |
| Sound | AAC or MPEG4, sound rate less than 64 KHz | Captions are optional. |
| Frame rate | 30 frames per second recommended | A recommendation, not a hard rule. |
| Aspect ratios | 4:5, 9:16, 16:9, 1:1 | 5% aspect ratio tolerance. |
| Vertical 4:5 | Min 360 x 450, max 1080 x 1350 pixels | Takes more feed height than landscape. |
| Vertical 9:16 | Min 360 x 640, max 1080 x 1920 pixels | Full-height vertical video. |
| Landscape 16:9 | Min 640 x 360, max 1920 x 1080 pixels | Standard widescreen. |
| Square 1:1 | Min 360 x 360, max 1920 x 1920 pixels | Works for most feed layouts. |
| Width and height | 360 to 1920 pixels each | Ratio must sit between 9:16 and 16:9. |
| Thumbnail | JPG or PNG, 2 MB maximum, same ratio and resolution as the video | Optional but recommended. |
| Headline | 70 characters recommended, 200 maximum | Shown under the video. |
| Introductory text | 150 characters recommended, 600 maximum | Shown above the video. |
| Ad name | 255 characters, optional | Only you see it in Campaign Manager. |
| Landing page URL | Required, up to 2000 characters, http:// or https:// | Where the button sends people. |
LinkedIn Video Ad Specs: Sizes, File Limits and Text Lengths
Pick one ratio for the placement
Choose 4:5, 9:16, 16:9 or 1:1 before you edit. Vertical 4:5 and square 1:1 take up more of the feed on a phone than 16:9, while 16:9 suits a video already made for a website or YouTube. Build the edit at that ratio from the start, because cropping a finished 16:9 video to 4:5 often cuts off faces and text.
Set the canvas size inside the limits
Export at the largest size LinkedIn lists for your ratio: 1080 x 1350 for 4:5, 1080 x 1920 for 9:16, 1920 x 1080 for 16:9 or 1920 x 1920 for 1:1. Never go below the minimums, such as 360 x 450 for 4:5 or 640 x 360 for 16:9. LinkedIn allows a 5% aspect ratio tolerance, but an exact ratio avoids surprises.
Export an MP4 with AAC sound at 30 frames per second
Save the file as MP4 with AAC or MPEG4 audio and a sound rate under 64 KHz. Use 30 frames per second, which LinkedIn recommends. Then check the file size: it must be at least 75 KB and no more than 500 MB, and the video must run at least 3 seconds and no longer than 30 minutes.
Add captions and a thumbnail
Captions are optional, but many people watch the feed with the sound off, so burned-in or uploaded captions help the message land. Make a custom thumbnail as a JPG or PNG under 2 MB, at the same ratio and resolution as the video, and put the main promise of the ad on it.
Write the text to the recommended lengths
Keep the introductory text near 150 characters and the headline near 70 characters, even though LinkedIn allows 600 and 200. Pick a call to action that matches the landing page, such as Learn More, Sign Up, Register or Request Demo, and paste a full landing page URL that starts with http:// or https://.
Use the free tools or Infinall AI to speed it up
The free LinkedIn Ad Character Counter checks your introductory text and headline against the recommended lengths before you paste them in. If you need the video itself, Infinall AI Motion makes short animated videos of 10 to 60 seconds from a prompt and your saved brand, on Free and Pro, and exports them as an MP4 at no credit cost. On Pro, the video composer makes videos of 1 to 180 seconds that start at 30 frames per second. The AI Editor adds timed captions to a clip, and making the subtitles is free in credits.
LinkedIn video ad size: which ratio to choose
LinkedIn lists 4 ratios for video ads, and each has its own pixel range. Square 1:1 goes up to 1920 x 1920, landscape 16:9 up to 1920 x 1080, vertical 4:5 up to 1080 x 1350 and vertical 9:16 up to 1080 x 1920. Overall, width and height must each be between 360 and 1920 pixels, and the ratio must sit between 9:16 and 16:9.
If you are making one file for LinkedIn only, a vertical 4:5 or a square 1:1 version is a sensible default because it fills more of a phone screen than 16:9. If you already have a landscape video from your website or a webinar, 16:9 is accepted as it is, and you save editing time. LinkedIn does not say one ratio performs better, so treat this as a layout choice and test two ratios if you have the budget.
LinkedIn video ad file size and length limits
The file must be an MP4 between 75 KB and 500 MB. Length runs from 3 seconds to 30 minutes. Those limits are wide, so most problems come from the other rules: sound in the wrong format, a ratio outside the allowed range, or a frame size below the minimum.
A 30 minute ceiling does not mean a long ad is a good idea. Shorter cuts are easier to watch in a feed, and the same footage can be cut into a short version for the ad and a longer one for your company page. If a long export goes over 500 MB, lower the bitrate in your editor rather than the frame size, and check the result before uploading.
LinkedIn video ad thumbnail size
The thumbnail is optional but LinkedIn recommends one. It must be a JPG or PNG no larger than 2 MB, and its ratio and resolution should match the video. So a 1080 x 1350 vertical video needs a 1080 x 1350 thumbnail, and a 1920 x 1080 landscape video needs a 1920 x 1080 one. A still frame from the video works, but a frame with a clear face, the product or a short line of text usually tells a scrolling reader more.
Where Infinall AI fits, and where it does not
Infinall AI can make the video, the captions and the ad copy from your saved brand, and from the Social Hub you can build a LinkedIn ad in the New ad composer and run it once a LinkedIn ad account is connected. Connecting accounts is a Pro feature, and a live ad uses 2 credits a month. Infinall does not buy media for you: LinkedIn charges the ad budget to your own ad account. If you already have a finished video from an editor or agency, you may only need to check it against the table above, and Campaign Manager alone is enough to run it.
Frequently asked questions
What are the LinkedIn video ad specs?
MP4 files from 75 KB to 500 MB, 3 seconds to 30 minutes long, AAC or MPEG4 sound under 64 KHz, 30 frames per second recommended, and a ratio of 4:5, 9:16, 16:9 or 1:1. Width and height must each be 360 to 1920 pixels.
What is the best LinkedIn video ad size?
Use the largest size LinkedIn lists for your ratio: 1080 x 1350 for 4:5, 1080 x 1920 for 9:16, 1920 x 1080 for 16:9 or 1920 x 1920 for 1:1. Vertical and square videos take more space in a phone feed than landscape.
What is the maximum file size for a LinkedIn video ad?
500 MB. The minimum is 75 KB. If your file is too large, export again at a lower bitrate rather than a smaller frame size.
How long can a LinkedIn video ad be?
From 3 seconds to 30 minutes, according to LinkedIn's video ad specs page.
Are captions required on LinkedIn video ads?
No. LinkedIn lists video captions as optional. They still help people who watch with the sound off.
How many characters can a LinkedIn video ad headline have?
LinkedIn recommends 70 characters and allows up to 200. Introductory text is 150 characters recommended and 600 maximum.
Sources and checks
Every price, rating and number on this page comes from the source pages below, checked October 2026. Prices and plans change often, so confirm on the vendor's own page before you buy.
- LinkedIn: Video Ads specifications, checked October 2026
- Infinall docs: What is Motion, checked October 2026
- Infinall docs: Length, shape, quality and versions, checked October 2026
- Infinall docs: Captions and transcription, checked October 2026
- Infinall docs: Paid ads from the Social Hub, checked October 2026