Video tools

Resize videoto the width you pick.

Pick a width and every video in the batch is scaled to it, with the height worked out for you so the picture keeps its shape.

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One-time purchase · macOS 26 or later · Works offline

Resize Video open in OneMacApp, with its settings in the inspector.

How it works

Three steps.Nothing to learn.

  1. 1

    Drop your videos

    Add one video or many. MOV, MP4, M4V, MKV, WebM, AVI and MTS all work.

  2. 2

    Pick a width

    Choose 3840, 1920, 1280, 854 or 640 pixels. That’s 4K, 1080p, 720p, 480p and 360p for a widescreen video.

  3. 3

    Press Resize

    The resized MP4s are saved in a dated OneMacApp folder in Downloads. Your originals keep their full size.

The details

Everything you’d want.Nothing you wouldn’t.

  • Never stretched

    Only the width is set. The height is calculated from the original shape, so portrait and widescreen videos both look right.

  • Standard sizes

    The widths line up with the resolutions people ask for, from 4K down to a small 640 pixel preview.

  • One setting for a batch

    Drop a folder of mixed footage and it all comes out at the same width, ready for a site or a presentation.

  • Done on your Mac

    Resizing runs locally with FFmpeg and saves H.264 MP4. No upload, no size limit, no watermark.

Resize Video

Opens
MOV, MP4, M4V, MKV, WebM, AVI, MTS
Saves as
MP4 (H.264, AAC)
Widths
3840, 1920, 1280, 854 or 640 px
Height
Follows the original aspect ratio
Batch
Any number of files at once
Needs
FFmpeg, installed for you in one click

FAQ

Questions,answered.

Drop the video into Resize Video, set Width to 1920 px and press Resize. A widescreen 4K video comes out at 1920 by 1080.

No. You only choose the width, and the height is worked out from the original proportions. To change the shape itself, use Crop & Rotate Video.

Going down in size usually does, because there are fewer pixels to store. For the smallest possible file, run the result through Compress Video as well.

They work too. The width you pick is the width of the frame, so a 1080 by 1920 portrait video set to 640 px comes out at 640 by about 1138.

More video tools

Same app.Plenty more to do.

Resize Video is one of 39 tools in OneMacApp.

Video, audio, images, PDFs and on-device AI in one native Mac app. Pay once and every tool is yours, including the ones we add next.

Get OneMacApp · $29₹1,499

One-time purchase · macOS 26 or later