Technically, they aren't "converting" anything. A video file is an MP4; a zip folder is a ZIP. There is no format change happening. What these services actually do is
However, anyone who has used the service for more than a week knows the catch. The free tier’s download speed is notoriously throttled. Watching a 1080p movie stored on Terabox often feels like reliving the era of dial-up internet—buffering icons, stuttering playback, and estimated download times measured in hours rather than minutes. terabox converter
Premium Terabox accounts have transfer quotas. When you use a converter, you are likely draining the bandwidth of a stolen or hacked premium account. That account owner (a real person) will eventually find their files locked or their account suspended. Technically, they aren't "converting" anything