Compress Video Online

Reduce video file size by up to 80% — directly in your browser, with no upload required. Free, private, and fast.

Compress Video Free →Free · No signup · No upload

Large video files are a pain to share, upload, or store. Whether you need to send a clip by email, post it on social media, or free up disk space, compressing your video online is the fastest solution. Resizor lets you reduce video file size right inside your browser — there's no software to install and no server upload involved. Your footage stays completely on your device.

Resizor uses the WebCodecs API for hardware-accelerated video encoding. You can reduce the resolution (e.g. from 4K to 1080p), lower the bitrate, or switch to a more efficient codec like VP9 or AV1. Most videos can be compressed by 50–80% with minimal perceptible quality loss. The tool supports MP4, MOV, and WebM output formats, and is completely free with no watermarks.

How It Works

Upload Your Video

Select or drag in your video file. MP4, MOV, WebM and more are all supported.

Adjust Quality & Resolution

Lower the resolution (e.g. 1080p → 720p) or reduce the bitrate to achieve your desired file size.

Download Compressed Video

Export the compressed MP4 and share it anywhere — email, social media, or web.

Why Choose Resizor?

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Private by Design

Your video never leaves your device. All compression happens locally using the WebCodecs API.

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Significant Size Reduction

Reduce video file size by up to 80% by lowering resolution and bitrate without visible quality loss.

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Fast Processing

Hardware-accelerated encoding in the browser is much faster than CPU-only online converters.

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Free & No Limits

No account, no watermark, no cap on file count or size. Compress as many videos as you need.

Frequently Asked Questions

How do I reduce video file size without losing quality?

The most effective way is to lower the resolution (e.g. from 4K to 1080p or from 1080p to 720p) and reduce the bitrate slightly. H.264 encoding is also more efficient than older codecs. Resizor lets you control both resolution and codec to minimise file size.

What is the best format for small video file size?

H.265 (HEVC) and VP9 offer about 40–50% better compression than H.264 at the same quality. AV1 is even more efficient. Resizor supports AVC (H.264), VP9, and AV1 depending on your browser's WebCodecs support.

Can I compress video for email or WhatsApp?

Yes. For email, aim for files under 25 MB (most email providers' limit). For WhatsApp, aim under 16 MB. Dropping to 720p and reducing bitrate in Resizor typically achieves this easily.

Does compressing a video reduce quality?

Some quality loss is inevitable when reducing file size, but at moderate settings (e.g. 1080p to 720p) the difference is barely perceptible on most screens. Resizor gives you control over the compression level so you can balance quality and size.

Is my video uploaded to a server when I use Resizor?

No. Resizor is a fully browser-based tool. Your video is processed on your own device using the WebCodecs API and is never sent to any external server.

Compress Video Online — Start Now

100% free, runs in your browser. No signup required.

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