What was the file format of the first video uploaded to YouTube?

it is likely that the video was in a standard video file format such as AVI, MOV, or WMV.

YouTube initially supported a limited range of video file formats, including AVI, MOV, and MP4, with a maximum file size of 100 MB and a resolution of up to 320x240 pixels. Over time, as technology has advanced and user demands have evolved, YouTube has expanded its supported file formats to include a wider range of codecs, resolutions, and bitrates.

The specific file format of the first video on YouTube is not crucial to understanding the video's historical significance or the platform's early development. Instead, the video serves as a reminder of the platform's simple, user-generated origins and the role it has played in shaping the way people create, share, and consume video content online.

The first video uploaded to YouTube was titled "Me at the zoo" and was uploaded by co-founder Jawed Karim on April 23, 2005. It was in the .mp4 format.