Motionix / Your workspace
A smaller video. A clearer choice.
Choose the constraint that matters: file size, resolution, sound, or destination format. Preview a real exported video instead of trusting a promised saving.
Three steps. One result to inspect.
Pick a readable video
MP4, MOV, WebM and MKV are containers, not guarantees of supported codecs. Start with a short sample and keep the original.
Choose the trade-offs
Set a target and resolution. Keep sound unless you explicitly choose mute. Match MP4 or WebM to your receiving app.
Play before downloading
Check duration, framing, sound, dimensions and actual bytes. A smaller file is useful only if the destination can play it.
Compress a video for email without guessing the limit
A byte target is a ceiling, not a visual-quality score. Duration matters: a longer video needs more bytes at the same bitrate, while sound and container overhead also consume space. The presets use binary MiB; a strict decimal attachment limit may require a lower target. A difficult target can fail rather than claim success with an oversized file. Use a lower resolution or a larger target, or trim the source elsewhere. Do not assume every email service counts attachments in the same way.
Why an MP4 or MOV video may not compress in your browser
A file extension identifies a container, not the codec inside it. A browser must decode the source and encode the chosen output. MP4 uses H.264 with AAC where available; WebM uses supported VP9/VP8 and Opus encoders. Audio capability can differ from video capability. The tool should explain a missing codec instead of silently removing sound or returning incorrectly named bytes. Try an explicitly muted copy only when that is acceptable, or use another supported format.
Reduce video resolution while keeping the frame shape
A smaller frame can lower the bitrate needed for a useful copy. It does not restore details lost in the source and should not stretch portrait footage into landscape. Inspect the output dimensions and play it at the intended size. High-resolution source decoding still uses memory even if the output is smaller. Keep the original for later editing and do not treat a compression preset as an archival-quality promise.
Local video compression with actual output checks
The browser processes the selected video; no video upload is required for a local download. Website requests still occur, and memory and encoder support limit what can be processed. Stop or reset when necessary; a late task should not revive an old result. Compare the displayed bytes even when a re-encoding is larger than its source. Optional cloud sharing is a separate upload, not a required step or automatic backup.
Your files, with explicit choices
Video processing does not require an upload. The site and processing assets use the network. Results are not automatically backed up. Cloud sharing is a separate upload you choose. Download your result and keep the original.
Frequently asked questions
Can every video fit below 10 MB or 25 MB?
No. Duration, sound, resolution, codecs and bitrate affect feasibility. Targets use MiB here and the output is checked; a result above the selected ceiling is not reported as success.
Why does the browser support video playback but not compression?
Playback decoding and encoding are different capabilities. The output codec, source codec and audio codec must be supported by this device.
Is the downloaded file always an MP4?
No. It matches the selected successful container. MP4 and WebM results have their actual MIME type and extension; changing the filename is not transcoding.
Will the sound stay?
Sound is retained when supported unless you explicitly choose mute. Missing audio support should produce an actionable error, not silently discard a track.
Does compression guarantee a smaller or identical-quality video?
No. Re-encoding may be larger, and lossy compression can alter detail. Inspect bytes and playback before keeping the copy.
Sources and the limits of this page
Sources checked
- MDN WebCodecs API
Device-specific codec support and the distinction between frames and containers.
- MDN video codec guide
Codec trade-offs and compatibility, not a preset-size guarantee.
These references explain formats or published requirements. They do not represent a partnership or an inspection of your file. Check the current requirements before using an export.