Video · English

Compress video — free, local & unlimited

Shrink MP4, MOV and WebM videos to email-friendly or WhatsApp-friendly sizes — all in your browser.

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Open the video compressor
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Note: The tool UI is in Swedish, but the workflow is purely visual — drop, pick resolution, download. Processing runs in ffmpeg.wasm on your device.

Krymp re-encodes video in your browser using ffmpeg.wasm. A 30-second 4K iPhone clip (≈ 120 MB) typically drops below 16 MB at 1080p — small enough for WhatsApp, Slack and most email systems.

Everything is local. The file is never uploaded, no account is needed, and there is no watermark or daily cap.

Private. Files are processed in your browser. Nothing is uploaded.

Free, unlimited. No account, no watermark, no daily caps.

How it works

  1. 1Open the tool. Drop an MP4, MOV or WebM video into the browser.
  2. 2Pick a resolution. 720p for chat, 1080p for sharing, 4K to keep maximum detail.
  3. 3Compress in your browser. ffmpeg.wasm runs locally — the video never leaves your device.
  4. 4Download. Save the smaller file or post it straight away.

FAQ

Is the video uploaded?
No. ffmpeg.wasm runs in your browser — your video stays on your device.
Which formats are supported?
MP4 (H.264/H.265), MOV, WebM and most common container/codec combos.
How small can I get it?
Typically 60–85 % smaller for mobile-shot 4K when re-encoded to 1080p — without visible loss on phone screens.
Is there a length limit?
No artificial cap — it depends on your device's memory. A typical laptop handles 5–10 minute 1080p videos comfortably.
Does it work on iPhone?
Yes — open Krymp in Safari, pick the video from your camera roll, and save the result back when done.

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