Compress video to 20 MB
Shrink a video under 20 MB and verify the finished file size. Processing stays on your device.
Drop videos to fit a size cap
Choose a quality level or an output size limit, then compare the finished file.
Any media file this browser’s engine can read. You can also drag in a folder. Several at once needs a free account.
How to compress a video to 20 MB
Choose a video and keep the 20 MB target, or enter another limit. The compressor picks a bitrate and resolution that fit, encodes the video in your browser, and measures the finished file before offering the download.
Step 1
Choose a videoPick the file that needs to fit under 20 MB.Step 2
Set the limitKeep 20 MB or enter another target size.Step 3
Download the resultSave the video after its final size is verified.
What to expect
- Supported inputs
- Any media file this browser’s engine can read.
- What happens
- The default limit is 20 MB. Bitrate is estimated from the limit and source size, and the resolution steps down when the budget is too tight for a sharp picture. The output is checked against the limit and the original file size. A smaller input is never intentionally expanded to fill the limit.
- Limits
- A bitrate estimate is not a size guarantee. Very short size budgets, unsupported codecs, or device memory limits can prevent a valid export.
Private by design
Your video stays on your device
Mastershot processes your file locally in this browser. It does not need to be uploaded to a server, and you do not need an account to use the tool.
- No upload
- No signup
- No watermark
Questions
About 30 seconds at 1080p, or about a minute at 720p. Longer videos are scaled down automatically; for the best picture, trim the clip first.
Discord’s free upload limit is 20 MB, and Outlook.com and iCloud Mail cap messages at 20 MB.
The export stops instead of handing you an oversized file. Trim the video, raise the limit, or try a different file.