Free video tool
Compress Video
Get a video under whatever limit it has to fit.
Video is the one thing that still routinely hits a size limit: 25 MB on an email attachment, a cap on a form upload, or a phone recording that is simply too big to send. Almost every online tool solves that by having you upload the file to a stranger's server first.
This one doesn't. It uses the WebCodecs API, which hands the work to the same hardware-accelerated video codecs your device already uses to play and record video. That makes it fast — often faster than real time — and it means the file never leaves your computer.
Aim for a quality level and let the encoder spend bits where the footage needs them, or name an exact size and get a file very close to it.
How to use it
- 01Drop in your video — its duration, resolution and codecs are read on your device.
- 02Choose what you're aiming for: a quality level, an exact file size, or a percentage of the original.
- 03Adjust resolution, frame rate and audio if you want, and check the estimate.
- 04Start, watch the progress, and download the result.
Frequently asked questions
Is my video uploaded anywhere?
No. Encoding happens in this tab using your browser's built-in video codecs. You can disconnect from the internet after the page loads and it still works.
Quality mode or target size — which should I use?
Quality mode for almost everything: the encoder spends bits where the footage needs them, so the result looks consistent. Use target size when a hard limit forces it, like a 25 MB attachment cap — it's accurate to within a few percent.
Which codec should I choose?
H.264 unless you have a reason not to — it plays everywhere and is hardware-accelerated on virtually every device. H.265 and VP9 produce roughly 30-40% smaller files at the same quality, but encode more slowly and aren't accelerated on every machine.
Why is it so much faster than other browser-based tools?
Most of them ship a copy of ffmpeg compiled to WebAssembly: a ~32 MB download that encodes in software, often 10-20× slower than real time. This uses WebCodecs, which calls straight into your device's own codec hardware.
I compressed a video and it barely shrank — or the quality collapsed. Why?
Almost always because of how compressed it already was. A video that is already down at a few hundred kbps for 1080p has nothing left to remove: re-encoding it at the same resolution costs quality and saves little, and the tool now warns you and offers a smaller resolution instead, which is the only thing that genuinely helps. At the other extreme, a video with plenty of bitrate can lose a lot of size at Balanced with very little visible change.
What are the limits?
There's no fixed limit on size or length — the ceiling is your device's memory, since the finished video is assembled in RAM. Very large files on a machine short on RAM may struggle. It needs a browser with WebCodecs: Chrome/Edge 94+, Safari 16.4+ or Firefox 130+.
Related tools
- Convert Video FormatConvert between MP4, WebM, MKV and MOV, with codec and quality control.
- Extract Audio From VideoPull the soundtrack out of a video as MP3, AAC, Opus or WAV.
- Video/CCTV Storage CalculatorEstimate storage needs for security camera, dashcam or 4K video recording.
- Compress PDFShrink a PDF to fit an upload limit, with the quality trade-off made explicit.
This is what Purgify automates.
Connect your cloud accounts and Purgify finds duplicates and reclaimable space like this — across all of them, on a schedule.
Want early access? Write to us at [email protected]