How to use this preset
- Choose a video from your device.
- Enter a target size in MB or leave it on Automatic.
- Export the H.264/AAC MP4, check its actual size, and retry with a lower target if needed.
PRIVATE VIDEO COMPRESSOR
Compress Video Without Uploading It
Choose an exact target size or let the browser optimize quality automatically. Your original video never leaves this device.
✓ No upload✓ No account required✓ Start immediately after selecting a video
Drop your video hereMP4, MOV, WebM, WMV, and moreor● Nothing is uploaded
Your video stays private
The File API, WebCodecs and FFmpeg.wasm run in this browser. Your source video is never sent to our server.
MP4 · MOV · WebM · WMVRelated creator tools
Choose quality or a target size
This compressor has two useful workflows. Leave the target blank and choose Compact, Balanced or High quality when visual quality matters most. Enter an MB target when a destination has a file-size limit. Both workflows encode locally and create a separate H.264 MP4 download.
Compress a video step by step
- Select an MP4, MOV, WebM, WMV or another locally decodable video.
- Trim unused time first. Fewer seconds leave more data for every remaining frame.
- For an exact-size workflow, enter the destination budget in MB. Otherwise leave the target empty and select a quality preset.
- Choose 720p for a smaller result or a higher resolution when detail matters.
- Export, open the downloaded MP4, check picture quality and audio sync, and verify its byte size before sharing.
What changes the output?
| Setting | Smaller-file choice | Trade-off to check |
|---|---|---|
| Duration | Trim unused sections | Content is removed |
| Resolution | 720p | Fine text can look softer |
| Target size | Lower MB value | Fast motion can show artifacts |
| Audio | Remove audio only when unnecessary | The result will be silent |
The final size is affected by duration, frame complexity, audio and MP4 container overhead. Treat the target as a budget, not a guarantee of an exact byte count.
Frequently asked questions
Does this video compressor upload my file?
No. Your browser reads and encodes the video locally. Your source video is not sent to YourVideoTool.
Which video formats can I select?
The file picker accepts MP4, MOV, WebM, WMV and other formats your browser or the local FFmpeg compatibility engine can decode.
Can I choose a target file size?
Yes. Enter a target in MB or leave the field empty to use a quality preset. The result can vary because duration, motion, audio and MP4 overhead all affect the final size.
Why might the exported file be larger than my target?
A target is an encoding budget, not an exact guarantee. Leave headroom for a strict destination limit, shorten the clip, or lower the target and export again.
Creator toolsEverything stays local
Compress videoOpen dedicated tool→Compress to 25MBOpen dedicated tool→Edit your YouTube videoOpen dedicated tool→Resize for ShortsOpen dedicated tool→01Truly local processingFile APIs, WebCodecs, and WebAssembly all run in your browser.
02Every feature is freeNo file-size limit, with up to 4K, batch, and advanced tools.
03No server copyNo video upload endpoint and no account required.