Format · MP4 (H.264 + AAC)
X videos as MP4: what's inside the file
Every video button on TwitterDownloaderX gives you an MP4 that X itself encoded. We pass it through untouched, so the codec, bitrate and frame size are exactly what X stores for that rendition.
Updated
Download only content you own or have permission to use. Public posts only; we store no videos. Responsible use
MP4 technical sheet
- Container
- MP4 (progressive download, single file)
- Video codec
- H.264 / AVC (the
avc1segment in X's media URLs) - Audio codec
- AAC, when the video has sound
- Re-encoding by us
- None: the file is streamed from X's CDN as-is
- File name
account_postID_quality.mp4, e.g.nasa_1234567890_720p.mp4- Size limit
- 600 MB per file through our proxy
Get MP4 from an X post
- Copy the post link. Share › Copy link on X.
- Paste and Extract. The result card lists every MP4 rendition with its label and, when X provides it, the file size.
- Click the size you want. The download starts as a normal browser download named after the account, post and quality.
How MP4 works on X
When X processes an upload it creates several MP4 renditions at different frame sizes and bitrates, and publishes them at addresses like video.twimg.com/…/vid/avc1/1280x720/….mp4. We read that list, label each rendition by its shorter side (so 1280×720 and 720×1280 are both “720p”), sort them highest first and show one button per rendition.
Because we don't transcode, there's no generational loss and no watermark: the MP4 you save is the file X serves to its own app at that quality. It also means we can't make a 1080p version of a video X only stores at 720p.
H.264 with AAC plays everywhere without extra codecs: iPhone Photos, Android galleries, Windows Media Player, QuickTime, smart TVs and every editor.
MP4 by the numbers
| Typical rendition | Frame size | Bitrate | ≈ MB per minute |
|---|---|---|---|
| 1080p | 1920×1080 | 10,368 kbps | ≈ 78 MB |
| 720p | 1280×720 | 2,176 kbps | ≈ 16 MB |
| 360p | 640×360 | 832 kbps | ≈ 6 MB |
| 240p (270p) | 480×270 | 256 kbps | ≈ 2 MB |
Limits and honest caveats
- Bitrates are the ones commonly listed in X's media data at the time of writing; sizes per minute are calculated from them. Your post can differ.
- Not every post has every rung. Older posts and phone uploads often top out at 720p.
- Files over 600 MB are refused by our proxy; pick a lower rendition for very long videos.
- Live replays are delivered as HLS and stitched to MP4 differently; see HLS to MP4.
What the file doesn't contain
The MP4 holds one video track and, when the clip has sound, one audio track. It carries no post text, no author name and no link back to X: the file name is the only record of where it came from. If you archive clips for research or as evidence, keep the original post URL alongside the file (our archiving guide suggests a simple log format).
Because the file is passed through untouched, two downloads of the same quality are byte-for-byte identical. That makes duplicates easy to spot with any checksum tool, and it means re-downloading later can't give you a “better” copy unless X itself re-encoded the post.
Moving the file between devices doesn't change it either: AirDrop, Quick Share, a USB cable or a cloud drive all keep the same MP4, so the quality you picked is the quality you keep.
Questions people ask
Is the MP4 the same quality as on X?
Yes. It is the exact rendition X serves at that size; we don't re-encode it.
Can I get a different codec, like HEVC or VP9?
No. X publishes H.264 MP4s, and we pass them through.
Why is the file name so long?
Account + post ID + quality makes every file traceable to its source and impossible to mix up.