Everything you send with Threema is encrypted before sending. This can require a high processor load, especially on older devices. We strive to provide both security and performance to all our users independently of their devices, which is why the sending of videos is currently possible within the following limits:
Android: Irrespective of its duration, the video’s file size cannot exceed 100 MB. You can set the video compression in “Threema > Settings > Media.” Increasing the compression allows you to send comparatively long videos.
iOS: Videos in high quality can be up to 24 minutes long; in low quality, videos can be up to 112 minutes long.
