Image Resizer

What is an image resizer?

An image resizer changes the width and height of a picture. Phone cameras take photos that are often 4000 pixels wide or more, which is far bigger than a website, email or social media post needs. Large images slow down pages, fill up inboxes and can be rejected by upload forms that set a maximum size. This tool lets you set the exact dimensions you need, or scale the image by a percentage, and then download the result in a few seconds.

The resizing happens on your own device using your browser. Your photo is not uploaded anywhere, which makes the tool fast and keeps private pictures private.

How to resize an image

1. Drop an image onto the upload area or click it to choose a file from your device.
2. Choose By pixels to type an exact width and height, or By percentage to scale the whole image, for example to 50%.
3. Leave Keep aspect ratio ticked so the picture is not stretched. When you change the width, the height updates automatically.
4. Pick an output format and, for JPG or WebP, a quality level.
5. Press Resize image, check the preview and the new file size, then press Download.

Features

• Two resize modes: exact pixel dimensions or a percentage of the original.
• Aspect ratio lock to avoid squashed or stretched photos.
• Format choice: keep the original format or save as PNG, JPG or WebP.
• Quality control for JPG and WebP, plus a background colour for transparent areas when saving as JPG.
• Smooth downscaling that reduces the image in steps for sharper results than a single jump.
• Works on any device, including phones and tablets.

Common image sizes

For a blog or WordPress post, 1200 to 1600 pixels wide is usually plenty. An Instagram square post works well at 1080 x 1080 pixels, and a YouTube thumbnail is 1280 x 720 pixels. Email newsletters normally use images no wider than 600 to 700 pixels. Profile pictures are often displayed at 400 x 400 pixels or less. If you are not sure, resize to the largest size the image will be shown at; there is no benefit in sending more pixels than the screen can display.

Tips for better results

Making an image smaller keeps it sharp, but making it much larger than the original cannot add detail that was never captured, so enlarged images look soft. Resize first and compress second for the smallest files. If your image has a transparent background, save it as PNG or WebP rather than JPG. For photos, JPG or WebP at a quality around 80 to 90 gives a good balance between file size and appearance.