Resize video

How it works

1. 1

   Add your video

   Drop in the video you want at a different size.

2. 2

   Pick a size

   Choose 9:16 for TikTok, 1:1, 16:9, 720p, or type an exact width and height, then decide whether to fill the frame or letterbox.

3. 3

   Download

   Save the resized MP4.

Resolution, upscaling, and what a resize can honestly do

Resizing resamples every frame to a new pixel grid. Going down is straightforward, because the encoder has more information than it needs and can average it cleanly; 4K footage scaled to 1080p often looks sharper than material shot at 1080p, since the detail is being condensed rather than invented.

Going up cannot work the same way, and it is worth being blunt about it. Upscaling 480p to 1080p does not recover detail that was never recorded; it interpolates new pixels from the ones around them, so the frame gets larger and slightly softer, and the file gets bigger for no visible gain. Upscale when a platform demands a minimum resolution, not because you expect the footage to improve.

Aspect ratio is the part people get wrong. If you resize 1920x1080 to 1080x1080 without accounting for the shape change, everything in frame gets squeezed horizontally and faces go narrow. Either keep the original ratio and let the numbers follow from one side, or crop to the shape you want first and resize the result.

Change video resolution locally, with no re-upload for every attempt

Because the resize runs on your device, trying a second setting costs nothing but the encode. There is no upload to repeat when 720p turns out to be too soft, and no queue to wait in, which makes it practical to actually compare two outputs instead of committing to the first guess.

The output carries no watermark and no resolution ceiling. Whatever your machine can decode, it can resize, and the file goes straight from your disk back to your downloads folder without a server in the middle.

If your real goal is a smaller file rather than a specific pixel size, use the compressor instead and give it a target size: it will pick the resolution that fits your budget, which is the same decision made with better information. To change the shape of the frame rather than its scale, crop it.

Why nothing uploads

Other tools send your video to their servers, which costs them money per file, so they add watermarks, cap file sizes, and make you sign up. This tool does the work right here in your browser using your own device. Your file is never uploaded, so there is no wait, no watermark, no size limit, and no account.

Questions

How do I make a video 9:16 for TikTok or Reels?

Pick the 9:16 preset (1080×1920). "Fill" crops the sides of a landscape clip to fill the phone screen; "Fit" keeps the whole picture and adds bars instead.

Can I change the resolution to 720p or 1080p?

Yes. Use the 720p preset or a custom size like 1920×1080. Lowering the resolution also makes the file smaller.

Will resizing distort my video?

No. The picture is never stretched: it's either cropped to fill the new shape or letterboxed to fit, whichever you choose.

Does my video get uploaded?

No. Resizing happens in your browser; your file never leaves your device.

Is there a watermark or size limit?

No watermark, no signup, no size cap.

Read more about this

• How to compress a video without ruining it

  Compression is a negotiation between size and detail, and most people lose it by pulling the wrong lever. Understanding what the encoder is actually doing makes the difference between a clean small file and a blocky one.

• Aspect ratios and safe zones, explained

  Getting the shape of the frame right is half of making a video look native to the platform it lands on. Getting the safe zone right is the other half, and almost nobody thinks about it until something important is hidden.

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