Ad specs, with receipts.

Feed image

Facebook and Instagram Feed, single image

• Meta recommends 4:5 at 1440 × 1800 px.
• Facebook Feed allows a 3% aspect ratio tolerance and 600 px minimum width; Instagram Feed allows 1% and 500 px. Gatecheck uses the stricter of each, so a file that passes runs in both.

Source: Meta Ads Guide: Facebook Feed image; Meta Ads Guide: Instagram Feed image

Feed video

Facebook and Instagram Feed, single video

• Facebook Feed recommends 4:5 at 1440 × 1800 px; Instagram Feed recommends 9:16 at 1080 × 1920 px.
• Instagram Feed allows up to 60 minutes; Facebook Feed up to 241.
• Meta asks for H.264, square pixels, a fixed frame rate, progressive scan and stereo AAC audio at 128 kbps or more, with no edit lists.

Source: Meta Ads Guide: Facebook Feed video; Meta Ads Guide: Instagram Feed video

Reels

Facebook and Instagram Reels ads

• Minimum width is 500 px for videos of 30 seconds or longer.
• Reels ads cannot use licensed music.

Source: Meta Ads Guide: Instagram Reels

Stories

Facebook and Instagram Stories, image or video

• Stories videos of 16 seconds or longer may be split into up to three cards.

Source: Meta Ads Guide: Instagram Stories

In-Feed

TikTok auction In-Feed video (non-Spark)

• These limits apply to non-Spark ads. Spark Ads promote an existing post, so the post itself is the creative.

Source: TikTok Ads Manager: Auction In-Feed Ads; Cadenus: TikTok safe zone in pixelssecondary

Skippable in-stream

YouTube skippable in-stream video ads

• No maximum length; under 3 minutes is recommended.
• The video is uploaded to YouTube first, then used in Google Ads.
• Google also accepts 4:3 (SD), 2:3 and 4:5, and standard definition down to 640 × 480 px horizontal or 480 × 640 px vertical, but does not recommend SD.

Source: Google Ads Help: YouTube video ad specs; Google Ads Help: video ad formats

Bumper (5 to 6 s)

YouTube non-skippable bumper, 5 to 6 seconds

• Google now defines bumpers as 5 to 6 seconds: "6 seconds (>=5 seconds minimum)".

Source: Google Ads Help: video ad formats; Google Ads Help: YouTube video ad specs

Non-skippable (15 s)

YouTube non-skippable in-stream

• Standard non-skippable is 15 seconds. Some campaign subtypes (such as TV screens) allow up to 60 seconds.

Source: Google Ads Help: video ad formats; Google Ads Help: YouTube video ad specs

Shorts

YouTube Shorts ads, vertical

• Gatecheck checks Shorts against the vertical ratios in Google’s table for every YouTube format: 9:16, 2:3 and 4:5.

Source: Google Ads Help: video ad formats; Google Ads Help: YouTube video ad specs

Display image

Uploaded image ads on the Google Display Network

• Animated GIFs may loop but must stop within 30 seconds and run slower than 5 frames per second.

Source: Google Ads Help: uploaded display ad specs; Google Ads policy: image ad requirements

HTML5

HTML5 display ads uploaded to Google Ads

• The limit is 600 KB, not the 150 KB many guides still quote (150 KB applies to image ads).
• HTML5 upload is only available to eligible Google Ads accounts: open more than 90 days, more than $9,000 lifetime spend and a good policy history.
• Animation must stop within 30 seconds, loops included. Google’s ad policy disapproves longer animation in image and HTML5 ads.
• File and folder names in the zip may use only letters, numbers, periods, hyphens and underscores, or the upload fails.

Source: Google Ads Help: uploaded display ad specs; Google Ads policy: image ad requirements; Google Ads Help: fix error messages with uploaded ads

Responsive / PMax image

Image assets for Performance Max, Demand Gen and responsive display

• Google recommends at least 4 landscape, 4 square and 2 vertical images per asset group, up to 20 of each.
• Logos are separate assets: square 1:1 and optional landscape 4:1.

Source: Google Ads Help: Performance Max specs and format requirements

HTML5

HTML5 display creatives trafficked in CM360

• A backup image is optional in CM360. If you use one, upload it separately, not inside the zip.
• The ad.size meta tag is optional in CM360 but it is the surest way to get the right size, so Gatecheck asks you to review a zip without it.
• No local storage or session storage, no zips inside the zip, no % in file names.

Source: Campaign Manager 360 Help: prepare HTML5 assets

HTML5

HTML5 creatives uploaded to DV360

• DV360 sets no zip size limit, but publishers do: keep the zip as small as you can.
• The zip file name must be shorter than 50 characters, including .zip.
• Each file name inside the zip can be up to 200 single-byte characters, or 100 double-byte characters (Japanese, Chinese or Korean).

Source: Display & Video 360 Help: HTML5 creatives

Display banners

IAB standard sizes for publisher direct deals

• Animation must not run longer than 15 seconds, including loops.
• IAB sets file weight by unit size (for example 50 KB initial load for 320 × 50 and 150 KB for 300 × 250). Gatecheck applies 150 KB to every size, the common publisher limit.
• IAB limits an ad to ten file requests during initial load. The 100-file cap is Gatecheck’s default for publisher zips.
• Publishers often add their own limits, such as a loop count; add their sheet as a custom spec.

Source: IAB New Standard Ad Unit Portfolio; SizeIM: creative trafficking checklistsecondary

Single image

LinkedIn Sponsored Content single image

• 4:5 vertical images show on mobile only. LinkedIn recommends 4:5 over 1:1.91 vertical, which gets borders.
• Animated GIFs must be 250 frames or shorter.
• Images narrower than 401 px show as a thumbnail.

Source: LinkedIn Help: single image ads specifications

Video

LinkedIn video ads

• LinkedIn names 4:5 as its recommended ratio for video.
• LinkedIn names AAC or MPEG-4 audio. Gatecheck accepts AAC, including HE-AAC, and flags MP3, which is not on the list.
• 15 to 30 seconds qualifies for every placement. In-stream placements take up to 90 seconds.
• Videos under 30 seconds loop until 30 seconds have played.
• LinkedIn states a frame rate below 30 fps; Gatecheck flags anything above 30.

Source: LinkedIn Help: video ads specifications

Single image or video

Snapchat full-screen image or video ad

• Snap asks for balanced stereo audio with a target level of -16 LUFS, AAC or PCM, at 192 kbps or more.
• Still images are shown as 5 second videos.
• Videos shorter than 3 seconds are looped to reach the 3 second minimum.

Source: Snapchat Business Help: single image or video specifications; Snapchat Business Help: safe zones for ads; Snapchat safe zone in pixels (Strike Social guide)secondary; Snapchat for Business: ad formats

Video

X (Twitter) promoted video

• X recommends files under 30 MB and supports up to 2 minutes 20 seconds; some advertisers can request up to 10 minutes.
• Videos under 60 seconds loop.

Source: X Ads Help: creative ad specs

Image

X (Twitter) promoted image

• GIFs render as a still image.

Source: X Ads Help: creative ad specs

Standard image

Pinterest standard image ad

• Pins taller than 2:3 may be cut off in feed.
• The limit is 20 MB on desktop and 32 MB in the app.

Source: Pinterest Business Help: product specs

Standard video

Pinterest standard video ad

• Any ratio from 1:2 (tall) to 1.91:1 (wide) is accepted. Pinterest recommends square (1:1) or vertical (2:3, 4:5 or 9:16) video, 6 to 15 seconds long.

Source: Pinterest Business Help: product specs

CTV spot (US)

Streaming TV ads served to US households

• From 1 July 2026, California SB 576 bars streaming services from playing ads louder than the content they accompany.
• ATSC A/85 (July 2026) recommends -24 LKFS when nothing else is agreed and lets streaming services pick one target between -23 and -27 LKFS. Confirm the publisher’s target.
• Publishers often want a high-bitrate mezzanine file (15 Mbps or more); confirm with the buyer.

Source: ATSC A/85:2026-07, loudness and true peak quick reference; California SB 576, bill text; Advalidation: CTV loudness, SB 576 and CALM Actsecondary; Tinuiti: CTV specs and ad format guidelinessecondary

HD spot (EBU R128, 25 fps)

TV commercials for PAL-region channels (Pakistan, Gulf, Europe)

• EBU R 128 sets -23.0 LUFS as the target and allows ±1.0 LU only where the target cannot practically be met, such as live programmes, plus ±0.2 LU for measurement error in quality control. Gatecheck flags a mix more than 1 LU off; many channels are stricter.
• Channels differ on codec (ProRes, XDCAM or high-bitrate H.264), slates and interlacing. Add the channel’s own sheet as a custom spec when you have it.

Source: EBU R 128 (version 5, 2023): loudness normalisation