Compress Video
Compress video files to MP4 format with customizable quality and preset settings to reduce file size.
Run tool
This online video compression tool reduces the storage footprint of your video files by re-encoding them into standard MP4 format. It uses H.264 video compression alongside AAC audio compression whenever an audio track is detected. You can adjust the Constant Rate Factor value between 18 and 40 to balance visual fidelity and file size, with lower values retaining higher detail and higher values producing smaller files. The tool also provides speed preset options ranging from ultrafast to veryslow, letting you choose between faster processing or more efficient compression. Direct file inputs up to 50 megabytes are supported, and the encoding operation is configured with a 45-second execution limit. Once processing finishes, the interface provides your converted MP4 file alongside detailed metrics showing original byte size, compressed byte size, and the calculated size reduction percentage rounded to one decimal place.
Instructions
- Upload a valid video file up to 50 MB in size.
- Set the desired quality level using a value from 18 to 40 (defaults to 28).
- Select an encoding preset from ultrafast to veryslow (defaults to medium).
- Click the run button to start the video compression process.
- Review the resulting byte sizes, reduction percentage, and download the compressed MP4 file.
Examples
- Compressing a 40 MB video clip with default settings (quality 28, medium preset) to produce a smaller MP4 file for web sharing.
- Encoding a 15 MB tutorial recording with quality set to 22 and preset set to slow for improved visual fidelity.
FAQ
What video format does this tool output?
The tool outputs an MP4 file using H.264 video compression and AAC audio compression when an audio stream is present.
What is the maximum file size allowed for compression?
The tool supports direct video input files up to 50 MB.
How does the quality factor setting work?
The quality factor accepts values from 18 to 40. Lower numbers preserve higher video quality with larger file sizes, while higher numbers achieve greater compression and smaller files.
Why did my video compression stop with an error?
Compression stops if the input file exceeds 50 MB, contains invalid data, uses an unsupported preset, or requires more than 45 seconds of processing time.