Change image dimensions
Resize Image Online
Resize an image online by pixels while preserving its aspect ratio. Change JPG, PNG and WebP dimensions privately and download instantly.
Choose an image
Drop a file here or choose one from your device.
Private browser processing · Maximum 50 MBBefore you start
What Resize Image does and when to use it
Resizing changes pixel dimensions, not merely the way an image appears on screen. It is the right choice when a website, profile, document or marketplace asks for a specific width and height. Keeping the aspect-ratio lock on prevents accidental stretching by calculating the second dimension from the original proportions.
Best for
Common uses
- Creating thumbnails and responsive website assets
- Matching exact width or height requirements
- Reducing oversized camera photos before publishing
Under the hood
How the browser processes it
ResizeImg reads the original width-to-height relationship and updates the paired value whenever the aspect-ratio lock is enabled. During export, the browser draws the source into a new canvas at the requested dimensions with high-quality image smoothing. The original file is never overwritten, and the generated image is offered as a separate download.
Practical checklist
Tips for a better result
- Enter the required width first and keep ratio lock enabled
- Resize down before applying aggressive compression
- Check small text after a large reduction
Know the limits
What this tool cannot promise
Making an image larger cannot recreate detail that was never present. The tool uses browser resampling rather than generative AI, and output dimensions are capped at 12,000 pixels per side to avoid excessive device memory use.
Simple workflow
How to resize image online
- 01
Choose the image you want to resize.
- 02
Enter the new width and height in pixels.
- 03
Create and download the resized image.
Questions and answers
Resize Image FAQ
How do I resize without stretching?
Keep the aspect-ratio option enabled. Changing either width or height will calculate the other dimension automatically.
Can I make an image larger?
Yes, but enlarging cannot recreate missing detail. For larger output, the Upscale Image tool applies high-quality browser resampling.