Stayput

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Change video resolution

Bring a 4K or 1080p video down to the resolution you need, without uploading it.

Change a video’s resolution in your browser: 4K to 1080p, 1080p to 720p or 480p. It is free, needs no account and adds no watermark, and your files are not uploaded: everything runs in your browser on your device. The size limit is your device’s memory, and phones hold less; give the page a short while after one visit to save itself for offline use, and then it works offline.

Drop videos to change the resolution ofor click to choose files. Batches welcome.
    Details

    1080p and the others set the short side, so tall phone videos stay tall. The aspect ratio is kept, unless you fill in both a custom width and height.

    Working…

    Done

    Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.

    Phones now record in 4K by default, which is more than most places a video ends up can show: a 4K clip is four times the pixels of 1080p, takes far longer to upload, and some editors and older computers struggle to play it. Dropping it to 1080p or 720p fixes all of that.

    Pick the resolution and Stayput decodes the video, scales each frame and encodes it again in your browser, keeping the shape of the picture. The p number sets the short side, so a vertical phone video at 1080p comes out 1080 pixels wide and stays vertical.

    The video never leaves your device, so there is no upload wait on a large file and no watermark.

    Pick by where the video is going. 1080p is the safe choice for YouTube, a TV or a presentation. 720p is plenty for a phone screen, a chat app or a video embedded in a web page, and it makes editing smoother on an older laptop. 480p and 360p suit previews and slow connections. The percentage choices halve or quarter both sides, which is handy when a clip has an unusual size that none of the p numbers describe well.

    Choose “Custom width and height” when a site asks for an exact size, such as 1080 by 1920 for a vertical video. Fill in only one box and the other follows the shape of the video. Fill in both and the picture is stretched to exactly that size, so only do it when the video already has that shape; otherwise cut it to shape first with Crop video. Sizes are rounded to even numbers, which video encoders require.

    How it works

    1. Drop one or more videos.
    2. Choose the resolution (1080p is selected).
    3. Press Resize and save the MP4s.

    In your browser, not on a server

    Mediabunny (MPL-2.0) reads the MP4, MOV, WebM or MKV container in your tab. Your browser’s own video decoder and encoder (WebCodecs) decode each frame, scale it to the new size and encode it again, H.264 where the browser has it and VP9 or AV1 otherwise. The sound is copied as it is when the MP4 can hold it, and Mediabunny writes the new MP4 in memory.

    Compared with upload-based tools: Online resizers upload the whole video before they start, which for a 4K phone clip can take longer than the resize, cap free files at a few hundred megabytes, and often add a watermark. Here the video never leaves your device.

    Verify it yourself. Give the page a short while after one visit to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.

    Questions

    Can I make a video a higher resolution?

    You can choose a larger size and the picture is scaled up, but that adds pixels, not detail: the video will not look sharper than the original.

    Which resolutions can I choose, and what file do I get?

    The New size list offers 4K (2160p), 1440p, 1080p, 720p, 480p, 360p and 240p, 50% or 25% of the original, or a custom width and height. MP4, MOV and WebM videos come out as MP4 files named with -resized added, and there is a Remove the sound tick box if you want a silent copy.

    How long does it take?

    Every frame is decoded and encoded again. On a recent computer expect roughly real time or faster for 1080p output, slower on a phone. Keep the tab open until it finishes.

    Does changing the resolution change the frame rate or length?

    No. Every frame is kept at its original timing, so a 60 fps clip stays at 60 fps and the length is the same to the frame. Only the number of pixels in each frame changes, along with the file size that follows from it. To change how fast the video plays, use Change video speed instead.

    Can I change the resolution of several videos at once?

    Yes. Drop them together and each is resized with the same setting, one after another. With 1080p chosen, landscape and portrait clips each get 1080 pixels on their short side, so a mix of phone and camera footage keeps each clip's own shape. Each result lists its new width and height and its length.

    Is the file uploaded anywhere?

    No. There is no server in this process. The page is a static file and the work is done by code running inside your browser tab. Give the page a short while after one visit to save itself for offline use; then you can turn off Wi-Fi and it still works.

    More video and audio tools

    Resize video

    Change a video’s resolution, from 4K down to 240p or to a width and height you choose. Resized on this device, never uploaded.

    Merge audio

    Combine songs, voice notes or podcast segments into one file. Done on this device, never uploaded.

    Mic test

    Check that your microphone works before a Zoom, Teams or Discord call: speak and watch the level, then play back five seconds to hear how you sound. Nothing is uploaded.

    Webcam test

    Check that your webcam works before a Zoom, Teams or interview call: see the live picture, the real resolution and the measured frame rate. Nothing is uploaded.

    Other conversions

    Guides