Check a video against Reels, TikTok and Shorts limits
Pick a video file and see, platform by platform, whether its length, file size, shape and format fit Instagram Reels, TikTok and YouTube Shorts. The file never leaves your browser.
The file stays on your device. Only its length, size and dimensions are read.
What the checker looks at
Your browser reads four things from the file: how long the video is, how big the file is, its width and height, and its container format. The checker compares those with the limits each platform publishes for uploads through its API, which is the route schedulers use. The in-app limits are sometimes looser, so a video that fails here may still upload by hand.
Instagram Reels through the API must be 3 seconds to 15 minutes, up to 300 MB, up to 1920 pixels wide, in MP4 or MOV. TikTok's API takes videos up to 10 minutes and 4 GB, between 360 and 4096 pixels on each side, in MP4, WebM or MOV. YouTube treats a video as a Short when it is 3 minutes or less and square or vertical.
A browser can't read frame rate or codec from a file, so those aren't checked. Instagram and TikTok both ask for 23 to 60 frames per second.
Questions
- Is my video uploaded anywhere?
- No. The checker reads the file's length, size and dimensions inside your browser. Nothing is sent to Postminion or anyone else.
- What video length works on Reels, TikTok and Shorts at once?
- Three minutes or less. YouTube only treats a video as a Short up to 3 minutes, every TikTok account can post at least 3 minutes through the API, and Instagram says Reels over 3 minutes won't be recommended to new audiences.
- What aspect ratio should a short-form video be?
- 9:16 vertical, such as 1080 x 1920 pixels. Instagram recommends 9:16 for Reels, YouTube requires square or vertical for Shorts, and TikTok doesn't publish a required ratio.
- Why does the checker use API limits and not app limits?
- Scheduling tools publish through each platform's API, and the API limits are often stricter. Instagram allows 20-minute Reels in the app but 15 minutes through the API, for example.
- Does it check frame rate or codec?
- No. A browser can't read those from a file without decoding it. Instagram and TikTok both accept 23 to 60 frames per second, and both accept H.264 video.
Post it everywhere from one place
Postminion schedules one upload to Instagram, TikTok, YouTube Shorts, Threads, Facebook and LinkedIn from a single calendar.