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Compress Video Online — Smaller Files, Same Quality

Secure processingNo signup required100% freeFiles deleted after 1 hour

Compress Video Online — Smaller Files, Same Quality works best with the full tool.

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Free · No signup · Files deleted after download

Reduce video file size directly in your browser using FFmpeg compiled to WebAssembly. Your video never leaves your device. Works with MP4, MOV, WebM, AVI, and MKV files.

Large video files create problems everywhere. Email clients reject attachments over 25 MB. WhatsApp limits videos to 16 MB. Most social platforms re-compress anything you upload, but they do it on their terms — you get no control over the output quality. Compressing before you upload means the final result looks exactly as sharp as you intended, because you chose the quality level, not the platform algorithm.

This compressor runs entirely in your browser using FFmpeg via WebAssembly. No file is sent to any server. For an MP4 at original iPhone quality (typically 150–300 MB for a few minutes of 4K footage), the output at a balanced quality setting is usually 20–50 MB — a reduction of 70–85% with no perceptible difference on a phone or laptop screen. The tool adjusts the H.264 CRF value, which controls the trade-off between file size and visual quality.

Common use cases: compressing a screen recording before attaching to a Jira ticket or email; reducing a wedding video clip to share on WhatsApp; shrinking a course recording before uploading to a learning platform; making a product demo video fast-loading for a website.

How to use it

Three steps, under 30 seconds from upload to download.

  1. 1

    Upload your video

    Select or drag an MP4, MOV, WebM, AVI, or MKV file. Files of any size are supported — processing is limited only by your device RAM.

  2. 2

    Choose a quality level

    Select Low (smallest file), Medium (balanced), or High (near-original quality). Medium reduces most videos by 60–75% with no visible degradation.

  3. 3

    Download compressed video

    Processing happens entirely in your browser via WebAssembly. Download the compressed file — same format as the input.

Common use cases

Real-world scenarios where this tool is the fastest solution.

✦

Email and messaging attachments

Reduce a clip below 25 MB for Gmail or 16 MB for WhatsApp without manually adjusting any settings.

✦

Website video backgrounds

Compress a looping hero video from 80 MB to under 5 MB so it loads instantly without blocking page render.

✦

Course and tutorial recordings

Shrink a 1-hour screen recording from 3 GB to 300 MB before uploading to Teachable, Kajabi, or Notion.

Questions & answers

Everything you might need to know before using the tool.

How much will the file size be reduced?+
Typically 50–80% depending on the original encoding and the quality setting you choose. A 200 MB iPhone 4K clip usually compresses to 30–60 MB at Medium quality with no visible difference on most screens.
Will the compressed video look worse?+
At Medium or High quality settings, the difference is not visible on a phone or laptop screen. At Low quality, very fast-moving scenes may show minor compression artifacts. The CRF slider lets you control the exact trade-off.
Is my video uploaded to a server?+
No. Compression runs entirely in your browser using FFmpeg compiled to WebAssembly. Your video file is processed locally and never transmitted over the internet.
What formats are supported?+
Input: MP4, MOV, WebM, AVI, MKV. Output: MP4 (H.264), which is universally compatible with all platforms, devices, and video players.
Can I compress a 4K video?+
Yes, but 4K files require significant RAM. On a device with 8 GB or more of available memory, 4K files up to 2–3 GB process reliably. For very large 4K files, use a desktop browser rather than mobile.

Your files are private

All processing runs locally in your browser using JavaScript. Your files are never transmitted to any server, stored, or shared. Close the tab and they're gone.

100%
Browser-local

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