Yes, Fast4k is completely free to use for converting YouTube videos to MP4 and MP3 formats. There are no hidden fees or subscriptions required.

Fast4k supports various video qualities, including standard resolutions like 480p, 720p, and 1080p, as well as higher resolutions like 4K and even 8K, depending on the source video's availability on YouTube.

Yes, Fast4k is designed with user safety in mind. We do not require any software installation or personal information from users. Your privacy and security are our priorities.

Yes, Fast4k supports downloading videos in high-resolution formats such as 4K and 8K if the original video on YouTube is available in these qualities.

Fast4k does not impose any limits on the number of videos you can download. You can use Fast4k as often as you like, free of charge.