Compress Video

Reduce video file size without losing watchability by lowering bitrate and resolution. Runs in your browser with FFmpeg WASM — your footage never leaves the device.

Conversions

About Compress Video

Compress Video re-encodes MP4, MOV, MKV, and other common video files using FFmpeg compiled to WebAssembly, all inside your browser. You control the trade-off: a target resolution (720p, 1080p) and bitrate, or a quality level. The output is one self-contained MP4 that streams and emails far better than the original. Because FFmpeg runs locally on your own CPU, your family clips, client footage, and unreleased content never leave your device.

Best for

  • Shrinking a 4K phone recording before emailing it or uploading to chat
  • Fitting a long screen recording under a chat-app size cap
  • Preparing client demo videos for fast upload over a slow link

Pros

  • +Pick resolution and bitrate to control exactly how much you compress
  • +H.264 output plays on essentially every device
  • +FFmpeg in WebAssembly runs entirely in your browser — no upload

Cons

  • −Encoding speed depends on your CPU; long videos take minutes on phones
  • −Aggressive compression of already-small clips can produce visible banding

How to use Compress Video

  1. 1

    Select or upload the source files from your local device storage.

  2. 2

    Specify conversion settings, options, or target output formats.

  3. 3

    Wait for the client-side browser logic to process the files securely.

  4. 4

    Download the finalized outputs directly to your system.

Frequently Asked Questions

How much can I usually compress a video?
Phone recordings of 1–5 minutes typically compress 50–80% at 1080p medium. Already-compressed short clips (sent over WhatsApp, downloaded from YouTube) shrink far less because there is little excess data to remove.
Will the compressed video stay in sync with audio?
Yes. FFmpeg re-encodes video and audio together and muxes them in the same pass, so audio stays aligned with lip movement and action even after heavy compression.
Can I keep the original codec (e.g. HEVC) instead of switching to H.264?
The defaults use H.264 so the output plays on essentially every device. Keep the original HEVC source alongside for archival, but use the H.264 version for sharing where compatibility matters.
Why is the compress slower on my phone than on a laptop?
Encoding is CPU-bound. Modern laptops have multiple fast cores; phones throttle heat and run on fewer cores. Compressing a 4K clip on a phone can take several minutes — split long videos into shorter chunks if needed.
Are my private videos uploaded during compression?
Never. The FFmpeg binary is compiled to WebAssembly and runs in your browser's sandbox. Your footage, your browser tab, your device — nothing is sent to a server.

Related tools

FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

USER REVIEWS

Compress Video Quality Rating

4.8
25 reviews

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