Social media video checker
Drop one video and see where it fits: YouTube, Shorts, TikTok, Instagram Reels, Facebook, LinkedIn, Pinterest, X and Threads, each checked against its own published rules. The file never leaves your device.
- Free, no sign-up
- Your file stays on your device
- Rules checked November 10, 2026
Drop a video
MP4, MOV, WebM and MKV are read from the file, phone clips and edits included. Your file stays on your device.
Reading your file…
Read on your device. Nothing is uploaded.Example: a vertical Meta ad Mark Studios edited for STP Books, as it plays on our site.
Where this video fits
Each platform name opens its own checker with every rule spelled out.
One export that fits every platform
- Shape
- 9:16 vertical1080 × 1920; Pinterest and Shorts take only vertical or square
- Length
- 4 to 90 secondsPinterest's 4-second minimum; Facebook's 90-second API limit for schedulers
- Frame rate
- 30 fps, constantX lists 40 fps max on the web; Instagram asks for 30 or more; Facebook's API needs a fixed rate
- Video
- H.264, under 25 MbpsX's web limit; progressive, 4:2:0
- Audio
- AAC, 48 kHz, stereo128 kbps or more for Facebook
- File
- MP4 with Fast StartIndex at the front, as Threads asks; under 300 MB for Instagram schedulers
That combination meets every rule the nine platforms publish, including the stricter ones for scheduling tools. It's the safe default for a clip you post everywhere; when a platform allows more (a 20-minute reel, a 4K YouTube upload), export that version separately.
Embed this checker
Teachers, bloggers and course creators can put this social media video checker on their own page for free. Paste the code below into your page's HTML. It loads from markstudios.com, so it stays current when we update the numbers.
Questions, answered.
Anything else? Message Mark and you'll get a written reply within one business day.
What video size works on every social platform?
A 9:16 vertical MP4 at 1080 × 1920, 30 fps at a constant frame rate, H.264 video under 25 Mbps with AAC audio at 48 kHz, the index at the front (Fast Start), between 4 and 90 seconds long. That meets the published rules of YouTube Shorts, TikTok, Instagram Reels, Facebook (including scheduling tools), LinkedIn, Pinterest, X on a free account and Threads.
Why 90 seconds?
It’s the strictest common limit: Meta’s API for scheduling tools takes Facebook reels of 3 to 90 seconds, and 90 seconds is also the longest Instagram reel you can boost. In the apps most platforms allow longer: Reels 20 minutes, TikTok 3 minutes for everyone, LinkedIn 15, Threads 5, X 2:20 on a free account.
Why 30 fps and not 60?
X Help lists 40 fps as the maximum for web uploads and Instagram asks for at least 30, so 30 fits both, and the other published ranges (23 to 60 at TikTok and Threads, 24 to 60 for Facebook’s API, 10 to 60 at LinkedIn) all include it.
Can one horizontal video work everywhere?
No. Pinterest lists only vertical and square shapes, YouTube Shorts are square or vertical, and a 16:9 video shows small with bars on TikTok and Reels. Export a 9:16 version for the vertical platforms and keep the 16:9 one for YouTube, LinkedIn and X.
Is my video uploaded anywhere?
No. The checker reads the file in your browser and nothing leaves your device.
Rather have every version made for you?
Send the footage, and the edit comes back in the shape, length and settings each platform wants, and you work directly with Mark.
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