Resize a video to 720p

Change a video's resolution to 1080p, 720p or a size of your own. Proportions are kept, and nothing is uploaded anywhere.

Drop your files here

.mp4, .mov, .mkv, .webm, .avi · up to 200 MB

Choose files

How to Resize the video

1
Add your video
MP4, MOV, MKV, WebM or AVI, up to 200 MB and five minutes. Phone footage in 4K is the usual thing to bring down to 1080 or 720.
2
Pick a resolution
The presets are named by the short side, the way people say them: 720p means 720 pixels tall on a landscape clip and 720 wide on a vertical one.
3
Press Build video, then download
Nothing is encoded before you press it. The result is an MP4 at the new size, with the same length and the sound kept, and the player shows it before you download.

What the 720p preset does to the frame

The page opens with 720p selected under “Resolution”, and the number is the short side of the frame. A landscape 1920 × 1080 clip becomes 1280 × 720, a vertical 1080 × 1920 phone video becomes 720 × 1280, and other shapes keep their proportions: 4:3 footage at 1440 × 1080 comes out at 960 × 720. Nothing is cropped or stretched. A clip that is already 1280 × 720 is not encoded again, and the page says so. A smaller one, such as 640 × 360, stays as it is while “Never enlarge” under “More settings” is on.

How much lighter the file gets

A 720p frame holds 921,600 pixels, four ninths of a 1080p frame. The clip's own bitrate is cut by the same share, so each pixel keeps about the bits it had, and the length and frame rate stay the same. In our check on October 20, 2026, a 30-second 1920 × 1080 clip of 46 MB became a 1280 × 720 MP4 of 22 MB. A vertical 1080 × 1920 clip went from 45 MB to 18 MB. Each took under four seconds after “Build video” in Chrome on a 2023 Mac, and the stereo sound came through. Resizing does not aim at a file size; if a form caps it, the row of next tools passes the 720p copy to Compress Video, which takes a target size.

Vertical phone videos come out upright

A phone often records a vertical video sideways and adds a flag that tells the player to turn it. Android's documentation for developers warns that some players ignore that flag. Here the turn is written into the pixels. In our check, a 44 MB clip stored this way came out as an upright 720 × 1280 file of 19 MB, with no flag left to ignore. The preset never changes the shape: for a 9:16 version of a landscape clip, use Change Aspect Ratio. If the browser cannot decode the clip's codec, as can happen with HEVC on some computers, the page names the codec and stops.

Formats, limits and saving the result

The clip is decoded, scaled and encoded in the browser tab, so the video never leaves your device. It takes MP4, MOV, MKV, WebM or AVI up to 200 MB and five minutes. The result is always an MP4 named after the original: a 1080p holiday.mov becomes holiday-1280x720.mp4. Nothing is encoded until you press “Build video”; the player then shows the finished file and its size. On an iPhone, “Download MP4” opens the Share sheet, where Save Video puts the clip in Photos; Android saves it to Downloads.

Scaled on your device

Decoding, scaling to the size you picked and encoding again all run on your own device, with the encoder built into your browser, and a clip smaller than the target is not blown up unless you allow it. No frame is uploaded, there is no account or queue, and you can resize as many videos as you need.

Frequently asked questions

Will resizing lose quality?

Making a video smaller discards detail by definition, but the bitrate is scaled to match, so the result looks about as good at its new size as the original did at its old one. What you lose is only visible if you then blow the video back up.

Can I make a video higher resolution?

Yes, by clicking a preset bigger than the source: the click switches off “Never enlarge”. A size that is already selected when the page opens does not, so a 640 × 360 clip on the 720p page stays as it is until you click 720p or switch that off under “More settings”. Enlarging still cannot add detail: the same picture is made of more pixels, and the file grows with the pixel count. If a platform demands a bigger canvas, the aspect ratio tool is usually the better answer.

Why did my numbers change by a pixel?

H.264 requires both sides to be even, so an odd number is rounded down by one. This is a hard requirement of the format, not a preference.

What does 720p mean for a vertical video?

720 pixels across. The presets measure the short side, which is how the words are used in practice: a vertical 720p clip is 720 × 1280, not 1280 × 720.

Is the sound kept?

Yes. The soundtrack is encoded again as AAC, aiming at the bitrate the source had, up to 320 kbps. Where the browser has no AAC encoder of its own, the page loads one; only if that fails is the sound saved as Opus, which plays in Chrome, Firefox and Edge but not in QuickTime.

Which browsers does this work in?

Chrome 94 and later, Safari 26 and later, and desktop Firefox 130 and later, which have the H.264 encoder this needs. On browsers without it, the page says so up front rather than failing halfway through.

Why is there a 200 MB limit?

Because frames are decoded and encoded in your browser's memory. Past that size, browsers start running out of room. For a bigger file, trim it first and resize the part you need.