What video format should I upload?
MP4 is accepted on every platform Socialync posts video to. Socialync converts a video only when a platform needs it, and a clean export posts as your own file. The table below lists the file types, the longest video, and the largest file Socialync accepts for each platform, and the free video spec checker compares a video with those limits.
Last checked November 10, 2026
Limits per platform
| Platform | File types | Longest video | Largest file |
|---|---|---|---|
| MP4, MOV | Check it with the video spec checker | 4 GB | |
| TikTok | MP4, MOV | 3 minutes | 4 GB |
| YouTube | MP4, MOV, AVI, WMV, FLV, WEBM | 3 minutes | 4 GB |
| MP4, MOV, AVI | 3 minutes | 4 GB | |
| MP4, MOV, AVI | 3 minutes | 4 GB | |
| X | MP4, MOV | 3 minutes, or 2 minutes 20 seconds when the X account has no Premium | 512 MB |
| Threads | MP4, MOV | 5 minutes | 1 GB |
| Bluesky | MP4, MOV | 10 minutes | 300 MB |
These are the limits Socialync applies when you post. Pinterest takes images only, so it is not in the table.
Test a file first
The video spec checker compares a video with the limits Socialync applies for each platform, and shows what each platform publishes itself next to them.
Related
Something here wrong or missing? Email support@socialync.io.