Image Resizer
Upload an image and resize it to a custom width and height, with an option to lock the aspect ratio so your image doesn't stretch or squash.
Click to upload, or drag and drop an image
Nothing is uploaded to a server — everything happens in your browser
How to Use This Tool
Upload your image
Click the box above or drag and drop any image file.
Enter your target width or height
With the ratio lock on, the other dimension fills in automatically.
Click "Resize image"
The image is redrawn at your new dimensions instantly.
Click Download
Save the resized image to your device.
About the Image Resizer
Resizing an image means changing its pixel dimensions — useful for fitting a specific layout slot on a website, meeting a platform's upload requirements, or simply reducing file size, since fewer pixels generally means a smaller file.
The aspect ratio lock keeps your image's width-to-height proportions consistent, so entering a new width automatically calculates the matching height (and vice versa) — this prevents the distorted, stretched-looking result you get from resizing dimensions independently without accounting for proportion.
This tool resizes using the Canvas API's built-in image smoothing, which produces a reasonably clean result for both upscaling and downscaling, though downscaling generally preserves more visual quality than significant upscaling, which can only approximate detail that wasn't in the original.
Frequently Asked Questions
What happens if I uncheck "Lock aspect ratio"?
You can then set width and height completely independently, which lets you resize into any exact dimensions you need — but if the new ratio doesn't match the original, the image will appear stretched or squashed.
Can I make an image larger than its original size?
Yes, though upscaling has limits — since you're asking the tool to invent pixel detail that wasn't in the original, images enlarged significantly beyond their native resolution will look progressively softer or blurrier.
Does resizing an image also reduce its file size?
Generally yes, since fewer pixels typically means less data to store, though the exact file size also depends on the image's content and the format's compression. For more direct file size control, pair this with the Image Compressor tool.
What's the best way to resize an image for a website hero banner?
Check your specific theme or website builder's recommended banner dimensions first, then enter those exact width and height values here with the aspect ratio unlocked if your source image doesn't already match that ratio, cropping separately if needed to avoid distortion.
Will resizing affect the image's aspect ratio metadata used by search engines?
Search engines primarily care about the actual rendered dimensions and file size for page speed purposes, both of which this tool directly controls. There's no separate hidden metadata field that needs updating beyond the actual pixel dimensions.
Is my image uploaded to a server for resizing?
No — resizing happens entirely in your browser using the Canvas API. Your image file is never uploaded anywhere.