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Resize Image

Resize any image to exact pixel dimensions or a percentage, with aspect ratio locking.

Runs in your browser. Nothing you add is uploaded.

What the Resize Image does

Resizing changes an image's pixel dimensions — the single most effective way to cut file size, and a hard requirement for platforms that specify exact dimensions. Reducing a 4000px photograph to 800px removes 96% of its pixels and usually looks identical at display size. This resizer uses the browser's high-quality canvas resampling, so nothing is uploaded.

How to resize an image

  1. Upload the image. Its original dimensions are shown so you know what you are starting from.
  2. Enter a target width or height. With the ratio lock on, the other dimension follows automatically.
  3. Or use a quick preset — 25%, 50%, and 75% of the original.
  4. Pick an output format and quality, then download. The filename records the new dimensions.

The Resize Image runs entirely in your browser — nothing you enter is uploaded, stored, or logged.

When to use it

Meeting an exact size requirement

Application portals and print services often specify precise pixel dimensions. Typing the numbers directly is faster and more reliable than dragging a crop handle.

Cutting page weight on a website

Serving a 4000px image in an 800px slot wastes most of the bytes downloaded. Resizing to the display size is the biggest single win available for Largest Contentful Paint.

Preparing images for email or chat

Halving both dimensions removes three-quarters of the pixels, which usually brings an oversized photo comfortably under an attachment limit.

Good to know

  • Keep the ratio lock on unless you specifically want to distort the image — unlocking it stretches the picture.
  • Downscaling is effectively lossless to the eye. Upscaling cannot add detail that was never captured, so enlarged images look soft no matter the setting.
  • Resize before compressing. Fewer pixels means the compressor has far less work to do for the same visual result.
  • WebP gives noticeably smaller files than JPG at the same quality and is supported by every current browser.

Guides that use this tool

Frequently asked questions

Does resizing lose quality?

Downscaling is essentially lossless to the eye. Enlarging cannot add detail that was never captured, so upscaled images look soft.

Does resizing reduce image quality?

Making an image smaller discards pixels but looks essentially identical at the new size, because there is more detail than the display can show. Making it larger is different — the extra pixels are interpolated from neighbours, so the result is softer than a photograph genuinely captured at that size.

How do I resize without stretching the image?

Leave the aspect ratio lock enabled. Setting a width then updates the height proportionally. Unlocking it lets you set both independently, which distorts the picture — occasionally useful, usually not what you want.

What is the difference between resizing and cropping?

Resizing keeps the whole image and changes its dimensions. Cropping keeps part of the image at original quality and throws the rest away. To hit an exact size with a different aspect ratio, crop to the right shape first, then resize.

Which output format should I choose?

JPG for photographs, PNG for screenshots, logos, or anything needing transparency, WebP when you want the smallest file and transparency together. Note that exporting to JPG fills transparent areas with white, since JPEG has no alpha channel.

Is my image uploaded?

No. The file is read into a canvas in your browser, resampled locally, and written straight to your downloads. Nothing is transmitted.

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