How to Reduce Video File Size Without Losing Quality

4 min read · Updated 2026-11-01

A big video is almost always big for one of three reasons: high resolution, high bitrate or an inefficient codec. Fix those and you can often cut the size by 50 to 90 percent with little visible change.

1. Lower the resolution to what the screen needs

A 4K video watched on a phone wastes data. Dropping from 4K to 1080p cuts the pixel count by four, and 1080p to 720p by more than half. In the converter, open Options and set the maximum height.

2. Use a modern, efficient format

H.264 in MP4 is the standard balance of size and compatibility. VP9 in WEBM is smaller still for the same quality but takes longer to encode. Old formats such as AVI, MPEG and WMV need much more space for the same quality.

3. Choose the Small quality preset

The Small preset raises compression. For talking-head clips, screen recordings and social media, the difference from High is hard to see on a phone.

4. Remove audio you do not need

Audio is a small part of the file, but removing it from silent clips or animations saves a little more. Tick Remove audio in the options.

5. Trim before converting

Cut unwanted seconds in your phone or editor first. Less video means a smaller file, whatever the settings.

What not to expect

Converting only the container (for example MKV to MP4) usually does not shrink a file, because the same video stream is copied across. Size changes only when the video is re-encoded, which happens when you set a lower resolution or when the codec cannot be copied.

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Frequently asked questions