[FAQ]

I’m creating more video content for the platform, and I want to make sure I’m exporting my files with the best possible settings to maintain quality after they’re uploaded and compressed.

What are the current recommended specifications for a native video post in 2025? I’m looking for details on the best aspect ratio, resolution, file format, and the maximum length and file size.

Any help would be great, thanks!

[Jeff Bullas]

That is a great technical question. Uploading your video with the right settings is a small step that makes a big difference in how professional your content looks on the X feed.

While the platform will compress any video you upload, starting with an optimised file ensures the final result is as sharp as possible.

Here are the key specifications to focus on. First, for the file format, the most reliable and universally compatible choice is to export your video as an MP4 using the H.264 video codec and AAC for the audio.

Second, regarding the aspect ratio, you should always optimise for mobile viewing. While you can post traditional horizontal videos, a square (1:1) or a vertical (9:16) format will take up more screen real estate and generally performs much better in the fast-scrolling feed.

Third, for resolution, a high-quality standard to aim for is 1080p. This means for a square video, your dimensions would be 1080 by 1080 pixels, and for a vertical video, 1080 by 1920 pixels.

Fourth, you need to be mindful of the video length. For a standard user account, the maximum length for a video upload is 140 seconds, which is 2 minutes and 20 seconds. Subscribers to X Premium can upload much longer videos, but for organic feed content, shorter is almost always more effective for holding attention.

And fifth, for file size, the maximum limit is 512 MB. It is always good practice to compress your video to a manageable size that is well below this limit, while still maintaining good visual quality.

In summary, for the best results on X, aim for a concise, mobile-first video. Export it as an MP4 file, use a square or vertical aspect ratio at 1080p, and ensure you stay within the platform’s time and file size limits. And do not forget to add captions, as most users will be watching with the sound off.

Cheers,

Jeff

[Author]

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