Open a video from your iPhone, pick the exact moment, and save a full-resolution frame. The video is processed locally in Safari; it is never uploaded.
Use the original video if possible. If it's in MEGA, download it to Files first.
The frame buttons move by 1 ÷ FPS seconds. Video encoding and variable frame rates can affect exact frame selection.
Choose a video to begin.
Tap Save to Photos, then choose “Save Image” in the menu that appears. You can also touch and hold the image above and choose “Save to Photos.”