TwentyThree accepts all common video formats in all resolutions, but with a few tweaks you can guarantee yourself faster upload and processing with the highest possible quality:

Video size

The Full HD format on TwentyThree is 1920x1080 pixels with a bitrate of 5000 kb/s, providing excellent quality for fullscreen viewing. If you're looking for higher quality, we support up to 4K resolution, which is 3840x2160 pixels. To reduce upload times without compromising quality, it's recommended to prepare your video with a fixed bitrate of approximately 10-15 Mbps. This ensures optimal playback while keeping the file size manageable.

Video and audio codec

Browser playback of high quality video happens by converting the incoming video to a few web-friendly formats. We recommend that the video is uploaded in MP4 and H264 − simply because the processing will be faster and you'll obtain the best quality when the video is played in a web browser or through podcasts.

File size and quality

When you upload a file to TwentyThree, we'll be optimizing it for web distribution. This means preparing it to play across devices on desktop, mobile and so on — but it also means compressing it to a file size that can actually be retrieved and played without buffering on slow web connections.

As a general rule, our standard video streams are:

• Roughly 7.5 MB per minute in standard quality.
• Roughly 15 MB per minute HD quality.
• Roughly 30 MB per minute in Full HD quality.
• Roughly 60 MB per minute in 4K

This means that your upload time can also be minimized, while still getting maximum video quality, by uploading videos with a file size of about 5,000 kbps or 35 MB per minute.