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Video Compressor

Reduce the size of MP4, MOV and WebM videos in your browser: pick a quality or a target size like 25 MB, lower the resolution, keep the sound.

Make a video small enough to send by email, share in a chat, upload to a form or keep on a full phone. The Video Compressor re-encodes MP4, MOV and WebM videos with your device's own video encoder: choose a quality level, or tell it the size you need — 8, 16, 25 or 50 MB, or any other — and it works out the right settings for the length of your video. Lowering the resolution to 1080p, 720p or 480p saves even more, and the sound can be kept or removed.

The whole job runs in your browser using WebCodecs, the hardware-accelerated media engine built into modern browsers, so your video is never uploaded. That makes it fast, private and free of the size limits, queues and watermarks of online compressors. Before you start, the tool shows the expected size and how much smaller the video will be.

How to use Video Compressor

  1. Choose or drop a video (MP4, MOV or WebM).
  2. Choose Quality (High, Medium or Small file) or Target size (8, 16, 25, 50 MB or another size).
  3. Optionally lower the maximum resolution and decide whether to keep the sound.
  4. Press Compress and download the smaller video.

Features

  • Compresses MP4, MOV, M4V, WebM and MKV videos.
  • Quality mode: High, Medium or Small file, adapted to the resolution and frame rate.
  • Target size mode: 8, 16, 25 or 50 MB, or any size you type.
  • Maximum resolution: original, 1080p, 720p or 480p, also for portrait videos.
  • Keep the sound (AAC) or remove it for an even smaller file.
  • Expected size and saving shown before you start; progress and Cancel while it runs.
  • Output is H.264 MP4, which plays on every phone, computer and website.
  • Runs in your browser with hardware encoding where available: no upload, no watermark.

Target sizes for common uses

In Target size mode the compressor divides the size you choose by the length of the video to find the bitrate (the number of bits per second) for the picture and sound. If the result comes out a little larger than the target, it automatically compresses once more slightly lower. Very long videos need a small resolution to fit a small target: when the bitrate would be too low for a watchable picture, the tool says so before you start.

Where it goesChooseTip
Email attachment (Gmail, Outlook)25 MB or lessMany mail servers refuse larger attachments
Discord without Nitro8 MB or 10 MBUse 720p or 480p for videos longer than a minute
WhatsApp, Signal, Telegram16 MB, 720pChats compress again on their side; a clean 720p file looks better
Website or forum upload50 MB or Medium qualityCheck the size limit of the site
Keeping on your phoneMedium quality, 1080pOften half the size or less with little visible loss

Quality levels and resolution

In Quality mode the bitrate follows the size and frame rate of the video: High keeps fine detail and suits videos you will watch on a large screen, Medium is a good balance for sharing and is usually much smaller than what phones record, and Small file gives the smallest size that still looks acceptable on a phone. Phones record at high bitrates so the camera never runs short; that is why their videos often shrink by half or more without visible loss.

The maximum resolution limits the shorter side of the picture, so 720p means 1280 × 720 for a landscape video and 720 × 1280 for a portrait one. A video is never enlarged. Going from 1080p to 720p alone cuts the number of pixels by more than half, which is the most effective way to reach a small target size and keep the picture sharp.

Why a video sometimes doesn't get smaller

Videos that were already compressed hard, such as clips downloaded from social networks or saved from a chat, have little left to remove. If the result would not be smaller than the original, the tool says so instead of giving you a bigger file. Choose a lower quality or resolution, or remove the sound, and try again. Compressing a video always loses some detail, so keep your original if you may need the best quality later.

Privacy, speed and supported browsers

Online compressors upload your whole video, compress it on their servers and make you download it again, which takes a long time for large files and gives a copy of your video to someone else. Here the video is read in pieces from your device and re-encoded by your browser's video encoder, which uses your device's hardware video chip when it has one, so nothing is uploaded and a short clip is done in seconds. Files up to 2 GB can be opened.

The compressor works in current versions of Chrome, Edge, Firefox and Safari. iPhone videos in H.265 (HEVC) need Safari, or Microsoft's HEVC Video Extensions on Windows; the tool explains this if your browser can't read them. If a browser can't encode H.264, the video is saved as WebM (VP9) instead.

Frequently asked questions

Is the video compressor free?

Yes. It is free, with no watermark, no account and no limit on file count.

Is my video uploaded?

No. The video is compressed by your browser on your device and never leaves it.

How do I compress a video for email?

Choose Target size and 25 MB (or less, if your mail provider needs it). For long videos, also choose 720p or 480p so the picture stays sharp.

How much smaller will my video get?

It depends on the original. Phone videos often shrink by half or more at Medium quality; the expected size and saving are shown before you start.

Will the quality drop?

Compression always removes some detail. High and Medium quality keep it hard to notice on most screens; Small file and small target sizes trade more detail for size.

Can I keep the sound?

Yes. Keep the sound is on by default (AAC). Turn it off to remove the sound and make the file a little smaller.

Which formats can I compress?

MP4, MOV, M4V, WebM and MKV videos. The result is an MP4 file (H.264 video, AAC sound) that plays everywhere.

Does it work on phones?

Yes, in current mobile browsers. Phones use their hardware encoder, so compression is quick, but very long videos may take a while.

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