How much smaller will this video compressor make my file?

It depends on the video. A noisy, detailed phone clip shrinks a lot; an already-compressed clip shrinks less. No exact saving is promised.

What do the three quality levels mean?

High quality (CRF 18) keeps the most detail and shrinks least; balanced (CRF 23) is the everyday choice; small file (CRF 28) shrinks most and softens detail.

What format comes out?

Always MP4, with H.264 picture and AAC audio, whatever format went in.

Yes. Audio is re-encoded as AAC and stays in sync with the picture.

Is this video compressor free?

Yes. It runs entirely in your browser — no account, no signup, and nothing uploaded.

Video Compressor – Smaller MP4s You Can Actually Send

A video that is too big to send is a video nobody watches. Chats cap attachments, inboxes bounce, and uploads crawl on slow connections. This free video compressor shrinks your clip to a smaller MP4 in your browser, so the file never leaves your device and no signup is needed. Pick a quality level that suits the destination, and the tool balances size against sharpness for you. The honest limits: heavy compression softens fine detail, so keep a copy of the original if quality is critical.

How to use this video compressor

From an oversized video to a sendable MP4, in three steps.

1Drop in your video

Choose a .mp4, .mov, .webm or .mkv file. The tool checks it is a video file before it starts.

2Pick a quality level

Choose the compression strength that suits where the video is going, from light to strong.

3Download the smaller MP4

The compressed file downloads with the same base name, ready to send or upload.

Why compress a video

A video that is too big to send is a video nobody watches. Chats cap attachments, inboxes bounce, and uploads crawl on slow connections.

Fits the limits

Shrinking the file gets it under attachment caps and upload limits without splitting or zipping.

Faster sharing

A smaller file uploads in a fraction of the time, which matters on mobile data and slow wifi.

Know the trade-offs

Heavy compression softens fine detail, so keep a copy of the original if quality is critical.

Private by design

The re-encode runs on your own device, so personal clips never leave your browser.

Video Compressor FAQs

Short, direct answers to the questions readers ask most.

It depends on the quality level you pick and the source. Light compression trims the fat; strong compression can cut the file to a fraction of its size.

At light settings, barely. Heavy compression softens fine detail, so keep a copy of the original if quality is critical.

MP4, MOV, WebM and MKV files. The compressed result always downloads as an MP4.

No. Compression only reduces the file size; the duration, resolution and frame rate stay the same.

Yes. It runs entirely in your browser, with no account, no signup, and nothing uploaded.