Video Compressor

Compress a video online — free and private

Videos are heavy. A minute of footage from a modern phone can run to tens or even hundreds of megabytes, and that's enough to bounce off an email limit, stall on a slow upload, or refuse to send over a chat app. Compressing the video shrinks the file so it actually moves — and this tool does it right in your browser, without sending your recording to a server. You pick a quality level, tap Compress, and get a smaller MP4 back.

That last part is the whole point. Most "compress video" sites upload your file to their machines, squeeze it there, and hand back a download link — which means your footage, whatever is in it, passes through someone else's server. Here nothing leaves your device. The compression runs locally, so a private recording stays private.

How it works

Upload a video, choose a quality level, and tap Compress video. On the first run, the tool loads a one-time video encoder (about 31 MB) into your browser — after that it's cached, so later jobs start straight away. A progress bar keeps you posted while it works. When it's done, you get an inline player to check the result and a clear before-and-after of the file size, then you can share or download the compressed MP4. Reading the video, re-encoding it, and packaging the result all happen on your own device.

Because the work is local, speed depends on the clip and your hardware. A short video compresses in moments; a long or high-resolution one takes more time and memory. On a phone, very long recordings are heavier going than on a computer, so for a very large file a desktop is the smoother choice.

What the quality levels do

To make a video smaller, the tool re-encodes it with the efficient H.264 codec and scales it down so it's at most 1280 pixels wide — big enough to look good on a phone or in a chat, while cutting the file size sharply. The quality level you choose controls how hard it squeezes:

High quality

The gentlest setting — the clearest picture and the largest of the three output files. Good when the footage matters and you just need it a bit smaller.

Balanced

The recommended middle ground: a noticeably smaller file with quality that still looks fine for sharing, messaging, and everyday viewing.

Smallest file

The strongest compression — the smallest file, with some visible quality loss. Reach for it when getting under a size limit matters more than perfect detail.

Whatever you pick, the output is a standard MP4 that plays on any phone, computer, or app with no special software. Most videos come out dramatically smaller; the tool shows you the exact before-and-after so you can decide whether to keep the result or try a different level. Very short clips that are already heavily compressed are the exception — they may not shrink much, and the tool will tell you honestly if the output isn't smaller.

What goes in, and what you get out

It accepts the video formats people actually have: MP4, MOV (the format iPhones record in), WebM, MKV, AVI, M4V and more. Whatever the container, the tool re-encodes it and gives you back an MP4 — the most universally compatible video format there is. Your compressed file is named after the original, with a -compressedtag, so it's easy to tell apart from the source.

Common uses

People compress video to get a clip under an email or messaging size limit, to speed up an upload on a slow connection, to save room on a phone that's filling up, or to send a screen recording or a family video without waiting forever. If you only need the sound and not the picture at all — a lecture, a song, a podcast recorded as video — pulling the audio out is far smaller than compressing the whole thing; our MP4 to MP3 tool does exactly that in your browser too.

Works on your phone

The tool is built to run in a phone's browser with nothing to install. Pick a video from your library, choose a quality level, tap Compress, and when it finishes use Share to send the file to Files, Messages, WhatsApp, or any app that takes video — or save it straight to your device. Sharing is the reliable way to keep a file on a phone, so it's the primary action on mobile, with a download option as a fallback.

Privacy: your video never leaves your device

Every step happens inside your browser — the video is read, re-encoded, and repackaged locally, and nothing is uploaded, stored on a server, or seen by anyone else. There's no account to create and nothing to delete afterwards, because the file was never sent anywhere in the first place. For personal footage — a family event, a private meeting, a recording you'd rather not hand to a stranger — that's the difference between shrinking a video and uploading it to an unknown server to do the same job.

Frequently asked questions

Which video formats can I compress?

MP4, MOV (iPhone video), WebM, MKV, AVI, M4V and more. Whatever you put in, the tool gives you back a compressed MP4.

Why is the first compression slower?

The video encoder (about 31 MB) downloads once on your first run, then it's cached. After that, speed depends on the video's length and resolution and on your device — long or high-resolution videos take more time and memory, especially on a phone.

How much smaller will my video be?

It depends on the footage and the quality level you choose, but most videos come out much smaller. The tool scales the video down to at most 1280 pixels wide and re-encodes it, and it shows the exact before-and-after size so you can judge the result.

Is my video uploaded to a server?

No. Everything runs in your browser — your video never leaves your device, and nothing is stored or sent anywhere.