Video Compressor
Compress MP4, MOV, WebM, MKV, AVI, and M4V videos to MP4 with quality profiles, target size, resolution control, optional audio removal, and before-and-after previews.
Options
Balanced suits most videos. Smaller file compresses more; best quality preserves more detail.
Smaller resolutions can greatly reduce the output size. Videos are never enlarged.
This tool is still being fine-tuned, so you may run into the odd error. Spotted one? Let us know so we can fix it.
What is Video Compressor?
Compress MP4, MOV, WebM, MKV, AVI, and M4V videos online with quality profiles, target file sizes, resolution control, optional audio removal, and an MP4 preview before download.
How to compress a video
Reduce a video's file size with a quality profile or a target size, optionally lowering its resolution or removing audio before downloading a compatible MP4.
Quality profile or target size
Quality profile is the quickest option: Balanced works well for most clips, Smaller file trades more visual detail for stronger compression, and Best quality preserves more detail at a larger size. Target size analyzes the full duration in two passes and assigns a bitrate intended to keep the MP4 under the number of megabytes you enter.
Choosing an output resolution
Keep original preserves the video's dimensions. 1080p, 720p, and 480p place a maximum bound around the frame while preserving its aspect ratio, including portrait video. A small source is never enlarged, and lowering a large source's resolution often saves more space than aggressive quality compression alone.
How to use it
- Upload one supported video up to 100 MB and 30 minutes.
- Choose a quality profile or target size, then choose the maximum resolution.
- Optionally remove audio and select Compress video.
- Compare the original and compressed previews, review the size change, and download the MP4.
Processed temporarily, never stored
Video encoding requires FFmpeg on a ProntoUso server. The uploaded video is used only for this request, temporary processing files are deleted automatically when it finishes, and neither the source nor result is stored or logged.
Frequently Asked Questions
Which video formats can I upload?
You can upload MP4, MOV, M4V, WebM, MKV, and AVI. The result is always an MP4 encoded with H.264 video and AAC audio for broad compatibility.
Will the target size be exact?
The two-pass encode aims to stay below the target, but container overhead and unusually complex footage can cause a small variation. If the target is impossible for the duration, the tool asks for a larger size instead of producing an unusable video.
Does 720p enlarge a small video?
No. Resolution choices only reduce videos that exceed the selected bound; smaller videos keep their original dimensions.
Can I compress a video without sound?
Yes. Select Remove audio from the result before compressing. This also leaves more of a target-size budget available for the picture.