Three ways to pick frames
Every few seconds saves one picture at a regular interval, for example every 1 or 5 seconds, starting at the very beginning. Fixed number spreads the frames evenly over the whole video, which is handy when you want 12 pictures to choose a thumbnail or to document a process. Current frame saves exactly the moment you paused on in the player above; use the player's controls to find the right moment first.
The frames are read straight from the video file at full resolution, not taken as screenshots of the player, so a 4K video gives 3840×2160 pictures. Image size can make them smaller, up to 1920, 1280 or 640 pixels on the long side.
JPG, PNG or WebP
JPG gives small files that open everywhere and is the usual choice for photos and thumbnails. PNG is lossless and larger; choose it when you want to edit the frame further or when it contains sharp text, such as a screen recording. WebP is smaller than JPG at similar quality and works on websites and in modern apps.
Many frames come in a preview grid: click a picture to save only that frame, or press Download as ZIP for all of them. File names include the number and the time of each frame, so they stay in order.
Limits
One run saves up to 500 frames; for a long video choose a longer interval. Videos in codecs your browser cannot play, such as some HEVC files in Firefox, cannot be read. Everything happens on your device, nothing is uploaded.