An image resizer changes image dimensions without uploading to a server. Set exact pixel dimensions or resize by percentage — all processing happens locally in your browser.
Drop image here or click to upload
JPG, PNG, GIF, WebP supported
How to Resize an Image Online
This tool resizes images entirely in your browser using the HTML5 Canvas API. No account required, no watermarks, and your images never leave your device.
Pixel Mode vs Percentage Mode
Use Pixel mode when you need exact output dimensions — for example, a 1200×630 Open Graph image for social media, or a 800×600 thumbnail. Use Percentage mode to scale an image to a fraction of its original size, like 50% for half the dimensions.
Aspect Ratio Lock
With aspect ratio locked, entering a width automatically recalculates the height (and vice versa) to keep the image proportions. Unlock it to stretch or squish to custom dimensions.
Frequently Asked Questions
Does resizing upload my image to a server?
No. The resizing is done entirely in your browser using the HTML5 Canvas API. Your image never leaves your device.
Can I maintain the aspect ratio?
Yes. Enable 'Lock aspect ratio' and entering either width or height will automatically calculate the other dimension to keep the proportions correct.
What image formats are supported?
You can upload JPG, PNG, GIF, WebP, and most other common image formats. The output is always downloaded as a PNG file.
What is the maximum image size?
There is no enforced limit, but very large images (over 20 megapixels) may be slow to process depending on your device.
Is this tool free?
Yes, completely free. No account, no watermarks, no limits.