How media compression works
Use this browser-based video compressor to make MP4, WebM, MOV, MKV, AVI, and OGV files smaller while keeping the original files unchanged. Upload several videos, choose a target size or quality, and download each compressed result.
How to compress files
- Choose one or more video or audio files.
- Open Advanced options for each file, or apply the same settings to the whole queue.
- Choose a percentage, target size, quality, or bitrate and start compression.
- Review the output, then download individual files or the ZIP archive.
Choose the right compression method
A target percentage or MB value estimates a final size from the original duration and bitrate. Quality-based video compression uses CRF, where higher values generally reduce size and quality. Bitrate limits are useful for predictable streaming or storage budgets. Reducing resolution, frame rate, audio channels, or sample rate can reduce size further.
What these media items mean
Codecs such as H.264, H.265, VP9, AAC, and Opus describe how media is encoded. Bitrate is the data used per second, CRF is a quality-based video scale, and a container such as MP4 or WebM packages the streams. These formats are maintained by standards bodies and open media communities rather than one individual creator.
For technical guidance, consult the FFmpeg documentation, the WebM Project documentation, and the Xiph.Org Foundation.