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Compress Video

Drop an MP4 and get a smaller one back, re-encoded by the same hardware video encoder your phone camera uses. The file is never uploaded, which for video is not only a privacy question: a 2 GB upload is the slowest part of every other compressor.

drop your files anywhere in this area

Your files never leave your device.

MP4 MOV M4V

01 / Fast steps

  1. Pick a compression profile above, then drop or select the video.
  2. The video is decoded and re-encoded frame by frame in your browser.
  3. Download the compressed MP4, ready for email, chat or upload.

02 / Best for

  • Get a video under the size limit of an email, a chat app or a form upload.
  • Shrink phone videos before backing them up or sharing a whole album.
  • Reduce a screen recording before attaching it to a bug report or a support ticket.
  • Compress footage of family or work that you would rather not hand to an online service at all.

03 / Why here

  • The video never leaves your device: no upload wait, no queue, no copy on someone else server. On a large file this is also simply faster than any upload-based tool.
  • Output is a real MP4 with H.264 video, which plays on WhatsApp, iPhone, Android, TVs and every editing program.
  • The soundtrack is copied across untouched rather than re-encoded, so the audio you get back is exactly the audio you had.
  • No watermark, no sign-up, no daily limit and no cap on file size or duration.
  • Videos above 1920 pixels are scaled down to that, which is where most of the saving comes from and is still more than any phone or laptop screen shows.

04 / Keep in mind

  • Requires a browser with a working H.264 encoder, which today means Chrome, Edge or Safari on a recent device. Firefox cannot do this yet and the tool says so instead of producing a file you cannot use.
  • The input must be an MP4-family file (.mp4, .mov, .m4v) with H.264 video. Other containers and codecs are not read.
  • Audio in a codec other than AAC cannot be copied into the new file and is left out, which the result message states explicitly.
  • Compression takes real work: expect roughly a quarter to half the duration of the video on a normal laptop, and to keep the tab open while it runs.

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Good to know

Questions & answers

01How can a browser compress video without uploading it anywhere?

Through WebCodecs, an interface that gives a web page direct access to the same video encoder the operating system uses for the camera and for video calls. The page decodes each frame of your file, hands it to that encoder at a lower bitrate, and writes the result back into an MP4. Nothing is emulated and nothing is downloaded: the codec is already part of your device, which is why this is both private and fast.

02Why is my compressed video smaller but slightly less sharp?

Because that is what compression is. H.264 stores an approximation of each frame, and a lower bitrate means a coarser approximation: fine texture, grain and fast motion are the first things to soften. The three profiles are three positions on that trade-off, and the strongest one is labelled as visibly softer on purpose. If sharpness matters more than size, use the lighter profile.

03Does the video lose its audio?

No. The soundtrack is copied into the new file exactly as it was, without being re-encoded, so it neither loses quality nor grows. The only exception is a video whose audio is in a codec other than AAC, which cannot be carried into the new container; when that happens the result message says the audio was left out rather than letting you discover it later.

04Why does it not work in Firefox?

Because compressing to H.264 needs an H.264 encoder exposed to the page, and Firefox does not offer one through WebCodecs yet. The honest options were to refuse or to hand you a WebM file instead, and a WebM is rejected by WhatsApp, by iOS Photos and by most of the places a compressed video is going. So the tool checks first and tells you to use Chrome, Edge or Safari rather than producing something that will not work where you need it.

05How long does compressing take?

Roughly a quarter to half of the video duration on a normal laptop, so a five-minute clip lands in one to three minutes. It depends on resolution and on whether your device has a hardware encoder, which most made in the last decade do. It is real computation on your own machine, which is the trade for not waiting on an upload and not queueing behind other people work.

06Is Compress Video free?

Yes, completely free, with no sign-up, no watermark, no duration limit and no file-size cap. It runs in your browser, so your videos never leave your device.