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Image Resizer

Change the width and height of an image in pixels or by percentage, with high-quality downscaling.

Runs locally in your browser – your data is not uploaded

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About the Image Resizer

The Image Resizer changes the pixel dimensions of a picture – for example to meet the size requirements of a profile photo, an online shop listing, a form upload or a website layout. Enter an exact width and height, or scale the image by a percentage, and download the result as JPG, PNG or WebP.

When an image is reduced to less than half of its size, the tool scales it down in several halving steps using the browser's high-quality smoothing. This keeps edges and fine patterns cleaner than one large jump. Before you start, it checks the requested size against sensible limits and warns about enlarging or stretching.

The image is processed entirely in your browser and is never uploaded.

How to use it

  1. Click "Choose an image", drop a file onto the box or paste an image from the clipboard.
  2. Enter the new Width or Height in pixels. With "Keep aspect ratio" ticked, the other side is calculated for you.
  3. Or click one of the Scale buttons (25%, 50%, 75%, 150% or 200%). "Original" restores the original size.
  4. Choose the output format – "Same as original", JPG, PNG or WebP – and, for JPG and WebP, the quality.
  5. Click "Resize image", check the new dimensions and file size, then click Download.

Features

  • Exact sizes with an aspect-ratio lock: Type a width or height and the other side follows automatically, or unlock the ratio to set both independently.
  • Percentage presets: Scale to 25 %, 50 %, 75 %, 150 % or 200 % with one click; the matching preset is highlighted.
  • High-quality downscaling: Large reductions use step-by-step halving with the browser's best smoothing setting for sharper, less jagged results.
  • Output format choice: Keep the original format or save as JPG, PNG or WebP. GIF, BMP and AVIF originals are saved as PNG, and transparent areas get a background colour of your choice when saving as JPG.
  • Clear limits and warnings: Sizes up to 16,384 pixels per side and 50 megapixels are allowed. You are warned when enlarging, when the image would be stretched, and when an output may be too large for iPhone and iPad.

Examples

Avatar for a forum

A forum accepts profile pictures of at most 512 × 512 pixels. Crop the photo to a square with the Image Cropper, then enter 512 as the width here – the height follows automatically.

Halving a photo for the web

Click 50 % to turn a 4000 × 3000 photo into 2000 × 1500 pixels. The image now has a quarter of the pixels, so the file is usually much smaller as well.

Exact banner dimensions

Untick "Keep aspect ratio" and enter 1200 × 630 for a link preview image. If the original has a different shape, the tool warns that the picture will be stretched – crop it to the right shape first to avoid distortion.

Limitations and notes

  • Enlarging cannot add detail that is not in the original; upscaled images look softer. The tool uses standard smoothing, not AI upscaling.
  • The maximum output is 16,384 pixels per side and 50 megapixels in total. Safari on iPhone and iPad may fail to create images larger than about 16.7 megapixels.
  • Resizing re-encodes the image: EXIF metadata such as camera details and GPS location is removed, and colour profiles may be converted to sRGB.
  • With "Same as original", GIF, BMP and AVIF files are saved as PNG, and WebP is saved as PNG in browsers that cannot create WebP. Animated images keep only their first frame.
  • Changing width and height independently stretches or squashes the picture. To change the shape without distortion, crop it instead.

Frequently asked questions

How do I resize an image without stretching it?

Keep "Keep aspect ratio" ticked and enter only the width or only the height; the other value is calculated from the original proportions. If you need a different shape, such as a square, crop the image first and then resize it.

Does resizing reduce the file size?

Usually, yes – fewer pixels mean less data. The format and quality matter too: saving a photo as PNG can make the file larger even when it has fewer pixels. The result panel shows the new size next to the original so you can compare.

What is the largest size I can create?

Up to 16,384 pixels on each side and 50 megapixels in total, for example 8,000 × 6,000 pixels. Very large outputs need a lot of memory; on phones and tablets they may fail even below that limit.

Can I change the DPI or print size?

This tool changes the pixel dimensions only and has no DPI setting. Print size depends on the number of pixels and the resolution used when printing: an image 3,000 pixels wide printed at 300 DPI is 10 inches (25.4 cm) wide.

Is my image uploaded anywhere?

No. The image is opened, resized and saved by your browser on your own device. Nothing is sent to a server.

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