Video length checker
Drop one video or a whole folder of clips to get each one’s exact length and the total runtime, and see how the longest fits YouTube, Shorts, TikTok and Instagram Reels. Your files never leave your device.
- Free, no sign-up
- Up to 50 files, none uploaded
- Platform rules checked November 10, 2026
Drop one video or many
MP4, MOV, WebM and MKV are read from the file, phone clips and camera originals included. Your files stay on your device.
Reading your files…
Read on your device. Nothing is uploaded.Example: one of our vertical edits, as it plays on our site.
Length and where it fits
The file
How long a video can be, by platform
| Platform | Longest | Note |
|---|---|---|
| YouTube | 15 minutes, or 12 hours once verified | The 12 hours or 256 GB, whichever comes first YouTube Help: Upload videos longer than 15 minutes (256 GB or 12 hours) |
| YouTube Shorts | 3 minutes | Square or vertical; longer or horizontal uploads as a regular video YouTube Help: Understand three-minute YouTube Shorts |
| TikTok | 3 minutes for everyone | Some creators can post 5 or 10 minutes TikTok for Developers: Content Posting API, media transfer guide |
| Instagram Reels | 20 minutes | Over 3 minutes isn’t recommended to non-followers; 90 seconds or less to boost Instagram Help Center: Record a reel on Instagram |
| Reels by API (schedulers) | 3 seconds to 15 minutes | MP4 or MOV, 300 MB at most Meta for Developers: IG User Media reference |
| X (Twitter) | 2 minutes 20 seconds | Free accounts; X Premium and paid plans take under 4 hours X Help Center: How to share and watch videos on X |
| Threads | 5 minutes | Up to 1 GB, 9:16 recommended Meta for Developers: Threads API, posts (media specifications) |
Total runtime for a batch
Select or drop up to 50 videos at once. Each file is read on your device, one after another, and listed longest first with its size, under the total runtime; the platform checks run on the longest. It reads the length stored in the file, so it works on multi-gigabyte camera originals as fast as on phone clips. For the shape a Short needs, the YouTube Shorts checker checks a batch for both length and orientation, and the upload time calculator tells you how long the files will take to send.
Embed this checker
Teachers, bloggers and course creators can put this video length 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.
How do I find the total length of several videos?
Select or drop them all at once (up to 50). The checker lists each file’s length and size, longest first, and adds up the total runtime.
How long can a YouTube video be?
Any account can upload 15 minutes. Once the channel is verified, uploads can run up to 12 hours or 256 GB, whichever comes first.
How long can a YouTube Short be?
Up to 3 minutes, in a square or vertical shape. A longer or horizontal video uploads as a regular video.
How long can a TikTok or an Instagram reel be?
TikTok’s developer guide says every creator can post 3-minute videos and some can post 5 or 10 minutes. Instagram Help says reels can run up to 20 minutes, but reels over 3 minutes aren’t recommended to people who don’t follow you, and a reel must be 90 seconds or less to boost.
Why does the checker’s length differ slightly from my editor’s?
The checker reports the length stored in the file. Editors often round to whole frames or show the timeline, which can add a frame or two of difference.
Are my videos uploaded anywhere?
No. The checker reads the files in your browser and nothing leaves your device.
Rather have it edited for you?
Send the footage, and the edit comes back in the size, frame rate and length each platform wants, and you work directly with Mark.
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