Match YouTube's recommended specs
YouTube works best with MP4 (H.264), 1080p or 4K resolution and a moderate bitrate. Exporting to these specs avoids unnecessary re-compression.
Platform-ready video
Compress Video for YouTube
Large videos take forever to upload and may hit size limitsPrepare videos at the right size and format locally in your browser for faster, smoother YouTube uploads
compress video for youtubereduce video size for youtubeyoutube video compressorcompress video before uploading to youtube
Select a video, choose MP4 at 1080p or 4K, and compress before uploading.
Drop your file here, or
Compress and convert MP4, MOV, MKV, AVI, and more locally without installing software.
Files stay on your device
MP4 · MOV · WebM · MKV · AVI
No upload required100% free foreverWorks in your browser
Steps
Quick workflow
Use this simple browser workflow to get a smaller file while keeping the original on your device
- Select your video file.
- Choose MP4 output format.
- Set resolution to 1080p or keep 4K.
- Use a balanced or quality preset.
- Compress and upload to YouTube.
What to know before you start
Faster uploads
Large 4K files can take hours to upload on slow connections. Compressing first makes uploads quick and reliable.
Local browser processing
Your video is processed on your device. Client content and personal recordings never leave your browser.
FAQ
Compress Video for YouTube FAQ
Short answers for the most common questions about this workflow and LessMB's local browser compression
No uploadFree toolBrowser-based
What video size does YouTube accept?
YouTube accepts up to 256GB and 12 hours, but large files upload slowly. 1080p MP4 at a moderate bitrate gives the best balance.
Does compressing before upload hurt quality?
Minimal impact. Uploading a file close to YouTube's specs means less aggressive re-compression on their end.
Are videos uploaded?
No. LessMB compresses videos locally in your browser session.