Resize Video Online — Change Resolution to 1080p, 720p or Custom

Scale a video to 2160p, 1080p, 720p, 480p or a custom size while keeping or overriding its aspect ratio.

Scaling footage down is the single most effective way to make it smaller, upload faster and play smoothly on a modest machine. Pick one of the four common heights or type an exact frame size, and every frame is resampled to those dimensions and written out as a new H.264 file with its soundtrack carried across.

How to resize a video

  1. Drop an MP4, MOV or M4V file; the Width and Height fields fill in with the source dimensions.
  2. Click 2160p, 1080p, 720p or 480p, or type an exact width or height in pixels.
  3. Leave Keep aspect ratio ticked so the other side follows automatically, or untick it to set each side on its own.
  4. Read the note above the export button, which says when an odd number you typed was rounded down by one pixel.
  5. Click Export MP4 and download the resized-<your clip>.mp4 file once the progress reaches 100%.

Presets cover the heights people are actually asked for

2160p, 1080p, 720p and 480p are offered as one-click buttons because those are the numbers upload guidelines and hardware specs are written in. Each sets the height and derives the width from your footage's own proportions, so a 21:9 recording stays 21:9 rather than being squashed into a 16:9 box.

An Original button puts both fields back to the source dimensions, which is useful after experimenting. The source size is printed beneath the fields so there is always a reference point.

Resize or crop a video: which one you need

Resizing scales the entire frame to new pixel dimensions, so everything in the shot stays visible and only sharpness and file size change. Cropping cuts away the edges to change the frame's shape, which is what a 9:16 story or a 1:1 square post needs from a landscape recording.

This page never adds black bars, blurred padding or a background fill. With the aspect lock on, the shape is preserved; with it off, the picture is stretched to the numbers you typed. To reframe for a different shape, crop to that ratio in the Video Cropper first, then bring the result here if it also needs a smaller frame.

Free-form sizing with a proportion guard

With Keep aspect ratio enabled — the default — editing either dimension recomputes the other from the source proportions, which is what you want in almost every case. Turning it off lets the two move independently, which deliberately distorts the picture and is occasionally what a specific display wall or signage slot requires.

Both fields accept any value between sixteen pixels and the encoder's ceiling. Enlarging beyond the original resolution is allowed but cannot invent detail that was never recorded, so an upscaled clip looks softer rather than sharper.

The even-number rule, stated rather than hidden

H.264 stores colour at half resolution horizontally and vertically, so its frame dimensions must both be even numbers. Rather than silently adjusting whatever you typed, an odd value is rounded down by a single pixel and the panel says so explicitly above the export button.

That one-pixel difference is invisible in the picture and unavoidable in the format. Knowing about it is better than wondering later why a file reports 1079 pixels tall when you asked for it.

Video resizing formats, size range and free limit

Downscaling 4K footage without uploading it

Large 4K recordings are exactly the files that take longest to push through an upload form, and here that step never happens. The clip is read from your disk, scaled frame by frame in the tab and saved as a new MP4, so a big source costs processing time and memory on your own machine instead of bandwidth and a wait in someone's queue.

Questions people ask about Video Resizer

How much smaller will the file be?
Halving both dimensions quarters the pixel count, which typically cuts the encoded size substantially, though the exact result depends on how much motion the footage contains. Static talking-head material shrinks far more than handheld outdoor footage at the same target height.
Can I make a low-resolution clip look high-resolution?
No. Scaling up interpolates between pixels that already exist and cannot recover detail the sensor never captured, so the result is a larger but blurrier picture. Enlarging is only worth doing when a downstream system demands a specific minimum frame size.
Does the audio change when I resize?
Not in any audible way. The soundtrack is decoded and re-encoded so the output is a complete file, but no gain, timing or channel changes are applied to it — frame dimensions and sound are entirely independent properties.
Why does the export refuse very large sizes?
The browser's hardware encoder advertises a maximum frame size, and asking for something beyond it produces a failure partway through rather than a file. The limit is checked before work starts so you get a clear message instead of a wasted encode.
How do I change a video from 1080p to 720p?
Load the 1080p clip, click the 720p button and export. The height becomes 720 and the width is derived from your footage's proportions, so a standard 1920×1080 file comes out 1280×720 with nothing stretched or cut off.
How do I resize a video for Instagram or TikTok?
There are no platform presets and no padding options here. If the app wants a different shape, such as vertical 9:16, crop the clip to that ratio in the Video Cropper first, then resize it on this page only if the file still needs a smaller frame.
What video formats can I resize?
MP4, MOV and M4V. The page reads files with an MP4 demuxer, so containers such as WebM, AVI or MKV cannot be opened and need converting first. Whatever you load, the resized result is always saved as an H.264 MP4.
What is the difference between resizing and cropping a video?
Resizing changes how many pixels describe the same picture, while cropping removes part of the picture. A resized clip still shows the whole scene at a new resolution; a cropped clip shows less of the scene, usually so it fits a different aspect ratio.
Can I resize a video on my phone?
It depends on whether your mobile browser supports WebCodecs H.264 encoding at the size you pick. The page checks for the encoder on load and tests the exact output size before encoding, asking you to try a smaller size if it is refused; we have not verified specific phones.

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Content reviewed 2026-09-27.