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About this tool
Check one video cut against the length, aspect ratio, file size and format rules of every major ad placement.
The Video Ad Specs Comparator takes one cut — its length, frame size, file size and container — and tests it against the published upload rules for ten major ad placements across Meta, YouTube, TikTok, LinkedIn, X, Snapchat and Pinterest. Instead of a static table it returns a pass or fail per rule, naming the exact limit each placement breaks, so you know whether you need a new crop, a shorter edit or just a lower bitrate. Built for social and performance marketers deciding how many versions of a hero video they actually have to cut.
Open Video Ad Specs Comparator on AltFTool — it loads instantly in your browser.
Upload or drag in the file you want to work with.
Adjust the settings and preview the result.
Download the finished file to your device.
Each placement reports length, aspect, resolution, file size and container separately.
Feed, Reels, Stories, in-stream, bumper, in-feed and sponsored video side by side.
Flags cuts that will upload but sit outside the length each placement actually rewards.
9:16 for Reels, Stories, TikTok and Snapchat, which are vertical-only; 1:1 or 4:5 for the Meta and LinkedIn feed, where 4:5 fills the most screen without cropping; and 16:9 for YouTube in-stream. One 9:16 master plus one 4:5 crop covers the majority of placements.
It depends entirely on the placement: a YouTube bumper is capped at 6 seconds, Stories ads at 60 seconds, TikTok in-feed at 60 seconds, X promoted video at 140 seconds, and the Meta feed accepts up to 241 minutes. Uploading is not the same as performing — most placements reward 15 seconds or less.
LinkedIn's 200 MB ceiling and TikTok's 500 MB ceiling are the two that catch people out, because Meta allows up to 4 GB. Re-encoding to H.264 at a delivery bitrate rather than uploading a ProRes or high-bitrate master almost always solves it without visible quality loss.
Yes, frequently, and some limits also vary by country, campaign objective and buying type. Use this as a first-pass check and confirm against the platform's current specification page before a campaign goes live.