Resize Image - Free Online Browser Tool

Resize images by width or by percentage, keeping them sharp in your browser. Nothing is uploaded.

A screenshot arrives at 3840 pixels wide for a column that is 800, and every page that loads it waits. A photograph needs to fit a print at a particular size, or a marketplace wants a square, or an upload form has a hard limit. Resizing is the fix, and it is also the one image operation that is free: fewer pixels means a smaller file with no loss of quality at all. Give it a width and the height follows the shape of the original, which is almost always what you want - a photo squashed to a fixed square looks wrong in a way that is hard to name. Or give it a percentage and everything scales together. You can change the format on the way through, or keep whatever each file already was, which is the safer choice when a batch is mixed. One thing worth saying plainly: making an image larger cannot invent information that was never captured. A 400-pixel icon blown up to 1600 pixels is a 400-pixel icon with four times the pixels, and it will look soft or blocky. Reducing, on the other hand, is always safe and often the whole point. Everything happens on your own device.

This resize image utility runs completely inside your web browser. Your document is opened locally and processed on your own device using JavaScript and WebAssembly, so your file is never uploaded to any server. There is no signup, no watermark and no limit on how many documents you can handle.

  • 100% client-side - files never leave your device
  • Instant processing, no upload wait
  • Works on desktop, tablet and mobile
  • Free forever, no account required

Common next steps: Image Converter, Compress Image, JPG to PDF.

How to Use the Resize Image Tool

Four steps, and the whole thing runs locally on your own device.

  1. Resize by width or by percentage

    Width in pixels is the usual choice when something has to fit a specific space. A percentage is better when you want a whole set shrunk by the same factor.

  2. Let the height follow

    Height is derived from the original shape, so the picture is scaled rather than distorted. A photo forced into a square always looks wrong, and this is the reason.

  3. Keep or change the format

    Leave the format alone for a mixed batch, or set one here to convert everything on the way out - handy for turning a pile of PNG screenshots into small JPEGs.

  4. Download

    One file stays one file; a batch arrives as a ZIP with the new dimensions recorded for each image inside it.

Frequently Asked Questions

Can I make an image bigger without it looking bad?

No, and no tool can. Detail that was never captured is not stored anywhere in the file, so enlarging can only spread what is there. A photograph taken at a high resolution can usually be enlarged a little; a small icon cannot.

Why is my resized image not exactly the size I asked for?

Because the height follows the width and the original shape, and rounding to whole pixels has to land somewhere. Asking for 1600 pixels wide on a 3:2 photo gives 1600 by 1067, which is the same picture.

Will resizing blur the picture?

Reducing does not - the browser resamples with smoothing and throws away pixels nobody would miss. Raising it does soften the result, because the extra pixels are interpolated rather than real.

Should I resize in pixels or in percentages?

Pixels when something has a size limit, such as an upload form or a print dimension. Percentages when you want a whole set of different-sized images to shrink by the same factor without thinking about each one.

Does it keep my original file?

Yes. Your file is opened read-only and is never modified; the resized version is a new file written alongside it in your downloads.