What is Image Resizer?

Image Resizer is a browser-based tool for resizing JPEG, PNG, GIF, and WebP images. You can set the size in pixels or percentages, then compare the resized result and file size before downloading.

All processing happens locally in the browser, so the image is not uploaded to a server. It works well for preparing blog images, adjusting graphics for social media, or reducing file sizes for sharing.

How to Use Image Resizer

1. Drag and drop an image, or click to select one.
2. Choose whether to resize by pixels or percentage.
3. Adjust the width and height, or choose a scale percentage.
4. Review the preview and file size, then download the result if it looks right.

The preview updates in real time whenever you change the settings.

Main Settings

Size Mode

The tool supports both pixel-based resizing and percentage-based resizing.

Resize by Pixels

This mode lets you enter exact width and height values. It is useful when you need specific dimensions, such as setting a blog image to 800px wide or matching a platform's recommended size.

Resize by Percentage

This mode scales the image relative to its original size. Options such as 25%, 50%, 75%, 150%, and 200% make it easy to shrink or enlarge an image without entering exact numbers.

Lock Aspect Ratio

When aspect ratio is locked, images resize while maintaining their original proportions. Changing the width automatically adjusts the height, preventing distortion.

When unlocked, you can set width and height independently. However, using values that differ from the original aspect ratio may stretch or compress the image.

Preview and File Size

The tool shows the original and resized dimensions, previews, and file sizes side by side. This makes it easier to notice when you have resized too aggressively or enlarged the image too far.

Use Cases

• Resizing blog or website images to a consistent width
• Adjusting images to better fit social media post sizes
• Shrinking large photos before sending them by email or sharing them
• Comparing the original and resized result before downloading

Things to Keep in Mind

• Enlarging an image beyond its original size can make it look soft or pixelated
• Turning off the aspect ratio lock can distort the image
• The tool processes one image at a time
• Supported formats are JPEG, PNG, GIF, and WebP

When enlarging an image, it is a good idea to check the preview carefully before downloading.

Technical Information

This tool runs entirely in the browser, and the image is not uploaded to a server. You can compare the original and resized results locally before saving the file.