Shrink videos, convert MOV and WebM to MP4, and turn a clip into a GIF, all in your browser.
MOV and MP4 are containers, and both can hold H.264 or HEVC video. See how they differ, when a MOV becomes MP4 without re-encoding, and when to re-encode.
Video too big to send? Check the attachment limit first, then lower the resolution and bitrate to save a smaller MP4. See what each quality level does.
A GIF's size grows with its frame count and the pixels in each frame. See how fps, width, clip length and dithering affect it, with measured examples.