Resize Image Online by Pixels
Resize image dimensions by width, height, or percentage with aspect ratio lock.
Interactive Tool Workspace
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Processing Limits & Device Capabilities
Processed client-side in browser memory. Recommended maximum file size is 50 MB on desktop and 15 MB on mobile.
How to Use Resize Image
- Upload a JPG, PNG, or WebP picture from your device.
- Enter your required width or height in pixels.
- Toggle the aspect ratio lock to preserve original image proportions automatically.
- Click
- and download your newly dimensioned file.
About Resize Image
Resize Image adjusts pixel dimensions for social banners, e-commerce listings, and profile pictures. Uses bicubic canvas interpolation for crisp downsampling with zero server uploads.
Frequently Asked Questions
How does the aspect ratio lock work when resizing?
When the aspect ratio lock is enabled, typing a new width automatically computes and sets the proportional height (and vice versa) so your photo is never stretched or distorted.
Does resizing an image reduce its file size?
Yes. Downscaling dimensions reduces total pixel count significantly, which substantially decreases file size in kilobytes.
Does resizing preserve transparency for PNG and WebP files?
Yes. Alpha transparency channels in PNG and WebP graphics are preserved intact when resizing via the browser canvas context.
What image formats and maximum dimensions are supported?
The tool supports standard JPG, PNG, and WebP files up to 50 MB on desktop devices. Canvas dimensions adapt to standard web and photo resolutions.
Are my private pictures uploaded to any external server?
Never. All image scaling and canvas rendering run strictly inside your local browser memory.
See real measured benchmarks across 5 test assets, transparency behavior, and compression comparisons.