Published specs
LinkedIn ad specs and character limits
Every character count LinkedIn publishes is two numbers, not one: a soft figure that avoids truncation and a hard maximum, three to twenty times higher. Both are in every table, because writing to the wrong one either truncates your copy or wastes half the field.
Single image ads, text and file
| Field | Value | Type | Source | Accessed |
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| Introductory text, to avoid truncation | 150 characters, including spaces, emojis and punctuation | Design recommendation | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Introductory text, hard maximum | 3,000 characters Three other maximums | Technical requirement | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Headline, to avoid truncation | 70 characters Not 60 | Design recommendation | Help Centre, single image ads ↗ · Marketing Solutions, single image specs ↗ | 16 Aug 2026 |
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| Headline, hard maximum | 200 characters | Technical requirement | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Description, to avoid truncation | 100 characters 70 on the other page | Design recommendation | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Description, hard maximum | 300 characters | Technical requirement | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Ad name | 255 characters | Technical requirement | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Destination URL | 2,000 characters, http:// or https:// prefix required | Technical requirement | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| File type | JPG, PNG or GIF | Technical requirement | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Animated GIF frames | 250 frames or shorter | Technical requirement | Help Centre, single image ads ↗ · Developer docs, images API ↗ | 16 Aug 2026 |
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| File size | 5 MB | Technical requirement | Help Centre, single image ads ↗ · Marketing Solutions, single image specs ↗ | 16 Aug 2026 |
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| Maximum dimensions | 7680 x 4320 px | Technical requirement | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Thumbnail rendering threshold | Images under 401 px wide display as a thumbnail image | Technical requirement | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Description rendering threshold | The description displays when the image is under 200 px wide, or when the ad serves beyond the feed through the LinkedIn Audience Network | Guideline | Help Centre, single image ads ↗ | 16 Aug 2026 |
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| Call to action options | Ten: Apply, Download, View Quote, Learn More, Sign Up, Subscribe, Register, Join, Attend, Request Demo | Guideline | Marketing Solutions, single image specs ↗ · Marketing Solutions, video specs ↗ | 16 Aug 2026 |
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| Call to action label length | No character limit published | Technical requirement | Marketing Solutions, single image specs ↗ | 16 Aug 2026 |
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| Safe zone | No figure published, in any unit Why there is none | Technical requirement | Help Centre, single image ads ↗ | 16 Aug 2026 |
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Two of these rows describe rendering rather than limits. Under 401 px wide, the image is drawn as a thumbnail; under 200 px wide, the description field starts appearing. Both thresholds sit on the Help Centre page and on no other LinkedIn property.
Single image ads, aspect ratios
The 4:5 minimum, 360 x 640, is a 9:16 frame rather than a 4:5 one. LinkedIn does not explain that, and it is recorded here rather than resolved. The first three rows are the Help Centre's list. The last two exist only on Marketing Solutions, which presents 1:1.91 and 2:3 as first-class vertical ratios while the Help Centre calls 1:1.91 supported but bordered. 2:3 appears on that one page and nowhere else in LinkedIn's documentation. LinkedIn publishes these three columns without classifying them, so the Type column describes the recommendation; the minimum and maximum are the bounds stated alongside it on the same page.
Video ads
| Field | Value | Type | Source | Accessed |
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| Introductory text, to avoid truncation | 150 characters, including spaces, emojis and punctuation | Design recommendation | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Introductory text, hard maximum | 3,000 characters 600 on the other page | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Emoji cap | 10 emojis | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Headline, to avoid truncation | 70 characters, hedged “on most devices” | Design recommendation | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Headline, hard maximum | 200 characters | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Description field | No description field is published for video ads | Technical requirement | Help Centre, video ads ↗ · Marketing Solutions, video specs ↗ | 16 Aug 2026 |
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| Ad name | 255 characters | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Duration | 3 seconds to 30 minutes | Technical requirement | Help Centre, video ads ↗ · Marketing Solutions, video specs ↗ | 16 Aug 2026 |
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| Duration, recommended | 15 to 30 seconds for all placements | Design recommendation | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Duration, in-stream | Up to 90 seconds | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| File size | Between 75 KB and 500 MB | Technical requirement | Help Centre, video ads ↗ · Developer docs, videos API ↗ | 16 Aug 2026 |
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| File format | MP4 | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Codec | H.264 or VP8 | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Frame rate | Less than 30 FPS 30 recommended elsewhere | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Audio format | AAC or MPEG4 | Technical requirement | Help Centre, video ads ↗ · Marketing Solutions, video specs ↗ | 16 Aug 2026 |
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| Audio size | Less than 64 KHz | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Captions | Must be in SRT format, with text only inside the SRT file | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Custom thumbnail | JPG or PNG, 2 MB maximum | Technical requirement | Help Centre, video ads ↗ · Marketing Solutions, video specs ↗ | 16 Aug 2026 |
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| Aspect ratio tolerance | 5% | Technical requirement | Marketing Solutions, video specs ↗ | 16 Aug 2026 |
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| Safe zone | No figure published, in any unit Why there is none | Technical requirement | Help Centre, video ads ↗ | 16 Aug 2026 |
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The 5% aspect ratio tolerance is published on Marketing Solutions and on no Help Centre page. It is the only tolerance figure LinkedIn publishes for any ad format.
Video ads, aspect ratios
| Field | LinkedIn recommends | Minimum to maximum | Type | Source | Accessed |
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| Horizontal 16:9 | 1920 x 1080 px, or 1200 x 675 px | 640 x 360 px to 1920 x 1080 px | Design recommendation | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Square 1:1 | No recommended value published | 360 x 360 px to 1920 x 1920 px | Design recommendation | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Vertical 4:5 | 720 x 900 px | 360 x 450 px to 1080 x 1350 px | Design recommendation | Help Centre, video ads ↗ | 16 Aug 2026 |
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| Vertical 9:16 | 720 x 1280 px | 360 x 640 px to 1080 x 1920 px | Design recommendation | Help Centre, video ads ↗ | 16 Aug 2026 |
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Square is the only ratio on the page with no recommended value; the other three have one. Both vertical ratios carry a restriction stated once, on the single image page: paid vertical assets serve on mobile devices only.
Carousel and text ads
| Field | Value | Type | Source | Accessed |
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| Carousel, introductory text, to avoid truncation | 150 characters, hedged “on some devices” | Design recommendation | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Carousel, introductory text, hard maximum | 255 characters 3,000 on the feed pages | Technical requirement | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Carousel, headline per card | A maximum of two lines before truncation | Technical requirement | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Carousel, card render size | Images are scaled to 312 x 312 px | Technical requirement | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Carousel, card image recommended | 1080 x 1080 px, 1:1 | Design recommendation | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Carousel, card image maximum | 4320 x 4320 px, 10 MB | Technical requirement | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Carousel, card formats | JPG, PNG or GIF (non-animated only) | Technical requirement | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Carousel, card count | Two minimum, ten maximum | Technical requirement | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Text ads, headline | 25 characters including spaces | Technical requirement | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Text ads, description | 75 characters including spaces | Technical requirement | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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| Text ads, image | 100 x 100 px, JPG or PNG, 2 MB or smaller | Technical requirement | Help Centre, Sponsored Content ↗ | 16 Aug 2026 |
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Two figures here are unusual. The carousel headline is the only text limit LinkedIn expresses in lines rather than characters anywhere in its ad documentation, and it gives no character equivalent and no line height. The 312 x 312 render size is the actual size a card is drawn at, which no other platform in this section publishes for any format: LinkedIn recommends a 1080 x 1080 asset and then scales it down by roughly three and a half times. The two figures are LinkedIn's; that arithmetic is ours.
What the API says, where it differs from the spec pages
| Field | Value | Type | Source | Accessed |
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| Image pixel cap | Less than 36,152,320 pixels | Technical requirement | Developer docs, images API ↗ | 16 Aug 2026 |
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| Alt text, maximum | 4,086 characters | Technical requirement | Developer docs, images API ↗ | 16 Aug 2026 |
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| Alt text, recommended | Less than 120 characters | Design recommendation | Developer docs, images API ↗ | 16 Aug 2026 |
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| Click URI, in the validation error | 500 characters or less, with a preceding http or https | Technical requirement | Developer docs, creatives ↗ | 16 Aug 2026 |
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| Video size ceiling, in the upload schema | “Maximum allowed Videos size is 5GB”, on the page that also states 500 MB | Technical requirement | Developer docs, videos API ↗ | 16 Aug 2026 |
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| Origin of the 3,000-character maximum | Raised from 1,300 to 3,000 characters, recorded in the 2021 changelog | Technical requirement | Developer docs, 2021 API changes ↗ | 16 Aug 2026 |
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| The numeric bounds behind the validation errors | Not published: {max}, {minRatio}, {maxRatio}, {minWidth}, {maxWidth}, {minHeight}, {maxHeight} all ship as unfilled templates | Technical requirement | Developer docs, creatives ↗ | 16 Aug 2026 |
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LinkedIn's developer documentation publishes validation errors rather than limits, and almost every bound ships as an unfilled template. Where the two layers disagree, the API describes what the server rejects and the marketing page describes what the advertiser is told: the click URI error says 500 characters where four spec pages say 2,000, and LinkedIn does not confirm the two are the same field.
What LinkedIn does not publish
LinkedIn gives no figure for any of these. If a spec sheet hands you one, it did not come from LinkedIn.
What LinkedIn does not publish| Not published | Pages checked | Accessed |
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| Any safe zone, safe area or text-overlay reserve for any LinkedIn ad format, in pixels, percentages or prose | The eleven LinkedIn-owned pages listed in the safe-zone section | 16 Aug 2026 |
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| The point where “…see more” actually truncates feed intro text. LinkedIn publishes only the number that avoids it | All four feed spec pages, the Sponsored Content page, LinkedIn Help search | 16 Aug 2026 |
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| Any desktop against mobile character or line figure. LinkedIn says “most devices” and “some devices” and resolves neither | All four feed spec pages | 16 Aug 2026 |
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| Any line count for feed intro text. The only line figure LinkedIn publishes anywhere is the carousel headline | All four feed spec pages, the Sponsored Content page | 16 Aug 2026 |
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| Pixel dimensions of the feed interface around the creative: profile row, Promoted label, headline bar, CTA button | All spec pages, the Ads Guide, the single image overview | 16 Aug 2026 |
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| Any letterbox, pillarbox, crop or zoom statement for video | Video ads on both Help Centre hosts, Marketing Solutions video specs, the Ads Guide | 16 Aug 2026 |
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| A recommended dimension for square (1:1) video. The minimum and maximum are published; the other three ratios all have a recommendation | Video ads specifications, both Help Centre hosts | 16 Aug 2026 |
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| A description field for video ads. Single image ads have one at 100 soft and 300 hard | Video ads on both Help Centre hosts, Marketing Solutions video specs | 16 Aug 2026 |
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| Minimum and maximum pixel values for the 2:3 and 4:5 verticals. Only recommended values are given | Marketing Solutions, single image specs | 16 Aug 2026 |
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| A character limit for the CTA button label on Sponsored Content. Ten options are named, no length is given | Both spec pages for each feed format | 16 Aug 2026 |
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| Any page reconciling the Help Centre, Marketing Solutions and the Ads Guide with each other | All three LinkedIn properties | 16 Aug 2026 |
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