Are my images uploaded while resizing?

No. The selected image is loaded into your browser and resized locally with Canvas. BaseToolbox does not receive or store your image file.

Which image formats can I resize?

The tool accepts common raster image formats such as JPG, PNG, WebP, and GIF. You can export the result as JPG, PNG, or WebP.

How does the quality setting work?

Quality applies to JPG and WebP output. Lower values usually create smaller files, while higher values keep more visual detail. PNG output ignores the quality slider.

Can I keep the original aspect ratio?

Yes. Keep aspect ratio is enabled by default, so changing width automatically updates height and changing height automatically updates width.

Is resizing the same as image compression?

No. Resizing changes pixel dimensions. Compression reduces file size. For best web performance, resize very large images first, then compress the result if needed.

Image Resizer

Resize JPG, PNG, WebP, and GIF images online. Keep aspect ratio, choose output format and quality, then download the resized image locally.

Upload image

Click or drag an image here

Supports JPG, PNG, WebP, and GIF. Files stay in your browser.

Width

Height

Lock aspect ratio

Output format

JPG

Quality: 90%

Preview

Original

Upload an image to preview it

Resized

Resize the image to preview the result

Resize images online without uploading photos

Use this image resizer to change photo width and height for websites, email attachments, social media posts, forms, and product listings. The resizing step runs in your browser with Canvas, so private images do not need to be uploaded to a server.

Common image resizing uses

Resize large photos before publishing them on a website or blog to improve load speed and layout stability.
Prepare images for profile pictures, thumbnails, banners, and social media posts with predictable dimensions.
Reduce image dimensions before attaching photos to email, forms, reports, or support tickets.
Keep the original aspect ratio while changing width or height, or unlock the ratio for exact custom dimensions.

Related image tools

Compress image file size Check image dimensions Convert image format

Image resizer FAQ

Are my images uploaded while resizing?: No. The selected image is loaded into your browser and resized locally with Canvas. BaseToolbox does not receive or store your image file.
Which image formats can I resize?: The tool accepts common raster image formats such as JPG, PNG, WebP, and GIF. You can export the result as JPG, PNG, or WebP.
How does the quality setting work?: Quality applies to JPG and WebP output. Lower values usually create smaller files, while higher values keep more visual detail. PNG output ignores the quality slider.
Can I keep the original aspect ratio?: Yes. Keep aspect ratio is enabled by default, so changing width automatically updates height and changing height automatically updates width.
Is resizing the same as image compression?: No. Resizing changes pixel dimensions. Compression reduces file size. For best web performance, resize very large images first, then compress the result if needed.