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Change Video Resolution

Resize video to 1080p, 720p, 480p or a custom size in your browser

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100% private. Your file is processed locally in your browser with WebAssembly — it is never uploaded to a server, stored, or seen by anyone.

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Change Video Resolution lets you resize any video to a different resolution such as 1920x1080 (1080p), 1280x720 (720p), 854x480 (480p), or a custom width and height. It is useful for downscaling large 4K footage to a smaller, more shareable size, fitting a video to a platform's required dimensions, or reducing resolution to shrink the file. The tool re-encodes the video using FFmpeg's scale filter and keeps the original audio track intact.

Everything runs locally in your browser using ffmpeg.wasm, a WebAssembly build of FFmpeg, so your video is never uploaded to any server — it is read into memory, rescaled, and handed back to you for download. It is completely free with no signup, no watermark, and no software to install. It works on Windows, Mac, Linux, Android, and iOS in any modern browser, making it ideal for content creators, students, and anyone who needs to quickly resize a clip without trusting their files to a cloud service.

Why use this tool

Standard presets and custom sizes

Switch instantly between 1080p, 720p, and 480p presets, or enter any exact width and height in pixels to match a specific platform requirement or screen size.

Shrink large files by downscaling

Dropping 4K footage to 1080p or 720p slashes the pixel count per frame, dramatically reducing file size so videos are faster to upload, email, or store.

Keeps audio and aspect ratio intact

The original audio track is copied over untouched, and proportional scaling prevents the stretched or squashed look that comes from forcing a mismatched width and height.

Fully private, no upload

Resizing happens locally via WebAssembly, so your footage never touches a server — ideal for confidential, personal, or unreleased video content.

How to use the Change Video Resolution

  1. Upload your video

    Drag and drop your video file onto the upload zone or click to browse and select it from your device.

  2. Choose a target resolution

    Pick a preset such as 1080p, 720p, or 480p, or enter a custom width and height in pixels.

  3. Keep the aspect ratio

    Leave proportional scaling on to avoid stretching, or set exact dimensions if you need a specific frame size.

  4. Resize the video

    Click the resize button and watch the progress bar as ffmpeg.wasm re-encodes the video locally in your browser.

  5. Download the result

    Download the resized MP4 file, or click reset to change the resolution of another video.

Popular use cases

  • Downscale a 4K phone recording to 1080p so it uploads faster and takes up less storage.
  • Resize a video to 720p to meet a website, learning platform, or email attachment size requirement.
  • Reduce a screen recording to 480p to create a lightweight clip for documentation or a support ticket.
  • Set a custom width and height to fit a video exactly to a kiosk display, embedded player, or specific aspect ratio.

Frequently asked questions

Is the Change Video Resolution tool free?
Yes, it is completely free with no signup, no watermark, and no usage limits. There is no premium tier required to resize a video, and you can change the resolution of as many videos as you want.
Are my videos uploaded to a server?
No. The video is processed entirely in your browser using ffmpeg.wasm (WebAssembly), so the file never leaves your device. Nothing is uploaded, stored, or seen by anyone, which makes it safe for private or sensitive footage.
What video formats are supported?
It accepts common formats including MP4, MOV, AVI, MKV, WebM, FLV, WMV, and M4V. The resized video is exported as an MP4 file using the H.264 video codec, which plays on virtually any device or player.
What resolutions can I change my video to?
You can pick standard presets like 1080p (1920x1080), 720p (1280x720), and 480p (854x480), or enter a custom width and height in pixels. For vertical or unusual aspect ratios you can also set one dimension and let the other scale proportionally to avoid stretching.
Will changing the resolution reduce video quality?
Downscaling to a lower resolution looks clean because detail is simply discarded, so 4K to 1080p stays sharp. Upscaling to a higher resolution cannot add real detail and may look soft, since the tool can only stretch existing pixels rather than invent new ones.
Does resizing the video change its file size?
Yes, lowering the resolution usually reduces the file size significantly because there are fewer pixels to encode each frame, which is a common reason people downscale 4K or 1080p footage. Upscaling can increase the file size without improving real visual quality.
Is there a file size limit?
You can resize videos up to around 500 MB to 1 GB. Because all processing happens in your browser's memory, very large files depend on your device's available RAM, so a powerful laptop handles bigger files than a phone.
How long does it take to change a video's resolution?
Changing resolution requires re-encoding the video, so it takes longer than a simple copy operation — typically from a few seconds to a couple of minutes depending on the clip's length, the target resolution, and your device's processing power. A progress bar shows the status the whole time.

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