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Compress

Compress Video

Make a video much smaller while keeping it watchable. Balanced usually cuts the size by half or more. Lower the resolution or use H.265 for even smaller files.

  • Nothing is uploaded
  • Free, no sign-up, no watermark
  • Works offline once loaded

Drop a video here

or choose a file

MP4, MOV, WEBM, MKV, AVI, M4V, 3GP, FLV, WMV and more

Processed on your device. Nothing is uploaded.

How to use Compress Video

  1. 1

    Add your video

    Drop the video on the drop zone or choose it from your device. Its size, length and resolution appear above the player.

  2. 2

    Pick a quality

    Choose Smaller, Balanced or Higher. Balanced is the best starting point for most videos.

  3. 3

    Fine-tune if you like

    Lower the Maximum resolution, switch Codec to H.265 for smaller files on newer devices, reduce or remove Audio, or cap the Frame rate.

  4. 4

    Compress

    Press Compress video. The progress bar shows elapsed time and an estimate; Cancel stops it at any point.

  5. 5

    Compare and download

    See the before and after size and the percentage saved, play the result, then Download it.

Why use Aback Video for this

  • Three clear presets

    Smaller, Balanced and Higher map to tested quality levels, so you do not need to understand bitrates or CRF.

  • Downscale safely

    Maximum resolution caps the shorter side, so vertical phone videos and landscape videos both scale correctly.

  • H.264 or H.265

    H.264 plays everywhere; H.265 saves around a third more space for phones and computers made in the last few years.

  • Nothing uploaded

    Compression happens in your browser, so private videos never leave your device.

Frequently asked questions

How much smaller will my video get?

It depends on the source. Phone videos recorded at high bitrates often shrink by 60 to 80 percent on Balanced with little visible change. Videos that are already heavily compressed shrink less, and occasionally Higher can even come out a little larger.

Which preset should I use?

Balanced for sharing and storage, Higher when quality matters more than size, Smaller when you need the file as small as possible and can accept some softness. If you need an exact size, use Compress to Size instead.

Is my video uploaded to a server?

No. FFmpeg runs inside your browser as WebAssembly and reads the file from your disk. You can even disconnect from the internet after the page loads.

Why is it slower than a desktop app?

Desktop apps use every CPU core and often the graphics chip. Browser FFmpeg encodes on a single thread, so a long 4K video can take a while. Lowering the resolution speeds it up a lot.

Should I choose H.265?

Choose H.265 if the video will be watched on devices from roughly 2017 onwards and you want the smallest file. Choose H.264 when you are not sure, such as for email, older TVs or Windows without the HEVC extension.

Is there a file size limit?

No fixed limit. On a computer, files of several gigabytes usually work. Phones have less memory for a browser tab, so very large files may fail there; we warn you before starting.

Can I compress a video on my phone?

Yes, in Safari and Chrome. Keep the screen on while it works, because some phones pause background tabs.

Will the compressed video have a watermark?

No. Free tools never add a watermark.

Related tools

Compress to Size

Fit a video under 10, 16, 25 or 50 MB. The bitrate is worked out for you.

Resize Video

Change the resolution to 4K, 1080p, 720p, 480p or exact pixels.

Trim Video

Cut the start and end of a clip. Fast mode keeps the original quality.

Convert Video

Convert between MP4, WebM, MOV, MKV and AVI. Lossless remux when possible.

Remove Audio

Mute a video by removing its sound track, without re-encoding.

Compress GIF

Make an animated GIF smaller by lowering size, frame rate and colours.

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