VidPackit is a browser-based video compressor that shrinks MP4, WebM, MOV, MKV, M4V and MPEG files entirely on your own device using the WebCodecs API, with no upload, no sign-up and no watermark.
What is VidPackit?
VidPackit is a free online video compressor that re-encodes video files at a lower bitrate to reduce their size. It accepts any video your browser can decode — MP4, MOV, MKV, WebM, AVI, MPEG-TS and common audio files — and outputs MP4, WebM, MOV, MKV, M4V or MPEG-TS video, or audio-only MP3, AAC, WAV, FLAC and OGG. The whole job runs inside the page via WebCodecs, so files never leave the device. It works on desktop Chrome and Edge.
Key Features
- Fully local encoding — decoding and re-encoding happen in the browser with WebCodecs; no video data is sent to a server, verifiable in the dev tools Network tab.
- Four compression levels — Original (100% video / 100% audio bitrate), High (70% / 100%), Medium (40% / 70%) and Low (20% / 50%), each showing its target bitrate before you start.
- Bitrate clamped to source — the encoder is never asked for a higher bitrate than the input, so output is never larger than the original file.
- Resolution downscaling — drop output to 720p (1280x720), 480p (854x480) or 360p (640x360), or keep the original resolution.
- Eleven output formats — MP4, WebM, MOV, MKV, M4V and MPEG-TS for video; MP3, AAC, WAV, FLAC and OGG for audio-only extraction.
- No watermark, no account, no queue — no sign-up, no daily limit and no logo burned into the output.
- Progress and time estimate — a progress bar and remaining-time estimate run during encoding.
- Format availability by browser — formats the browser's WebCodecs stack cannot encode are greyed out rather than failing mid-job.
Who is it for?
- Creators and editors — shrink large MP4 or MOV exports before uploading to platforms with size caps.
- Privacy-conscious users — compress sensitive footage without sending it to a cloud service.
- Anyone converting containers — repackage a video into MP4, WebM, MKV or M4V by leaving the level on Original.
- Podcasters and audio users — pull the soundtrack out of a video as MP3, AAC, WAV, FLAC or OGG.
What can you do with VidPackit?
- Shrink a clip for sharing: drop in a large MP4, pick Medium or Low, and download a smaller file that stays on your machine.
- Repackage a container: set the level to Original to move a video into MP4, WebM, MOV, MKV, M4V or MPEG-TS without re-encoding audio where the container allows it.
- Extract audio: choose an audio-only output such as MP3 to strip the soundtrack from a video.
- Downscale for mobile: reduce a 1080p or 4K source to 720p, 480p or 360p to cut size further.
How does VidPackit work?
- Drag a video onto the drop box or select it from disk; VidPackit reads its size, duration, resolution, codec and audio track.
- Choose a compression level, an output format and optionally a lower resolution.
- Press Convert Video; the browser encodes locally with a progress bar and time estimate, then you download the result.
FAQ
Is VidPackit free?
Yes. There is no account, no payment step, no daily limit and no watermark on the output. You can compress as many files as your device can handle.
Are my videos uploaded anywhere?
No. Encoding runs in your browser through WebCodecs, so the file never leaves your device. You can confirm this by watching the Network tab or disconnecting Wi-Fi after the page loads.
Is there a file size limit?
VidPackit sets no limit, but the practical ceiling is your device memory because the whole file is processed in the browser. A phone or low-memory laptop will struggle with multi-gigabyte clips that a desktop handles.
Which browsers are supported?
Desktop Chrome and Edge, which ship the complete WebCodecs support needed for in-browser encoding. Other browsers show a warning, and formats they cannot encode are greyed out.
Does compressing
