Compress a video to post on Twitter / X. Free, no upload, no signup. SammaPix shrinks your MP4 to upload faster and look sharp, right in your browser.
Twitter / X re-compresses big videos and limits length, which can leave your clip soft. Compress to a clean 1080p MP4 first so it uploads fast and keeps its quality.
Drop a video or click to browse
MP4, MOV, WebM, MKV, AVI — shrink files by up to 80%
100% in your browser — your video never leaves your device · up to 500 MB
Twitter / X accepts MP4 with H.264 and caps length and size for most accounts. Compressing your clip to 1080p MP4 first keeps it under the limits and avoids the platform softening it with its own re-compression.
Drop your clip, keep the 1080p downscale on for 4K, and pick a balanced quality preset. SammaPix re-encodes it locally and shows the estimated size live.
No. Everything runs in your browser with WebCodecs. Your video never leaves your device.
Smaller files upload faster, and giving Twitter / X a clean 1080p MP4 reduces how much its own compression degrades the result.