Resize Image Dimensions Online (Pixels, Percent & Aspect Ratio)
Resize image width and height for free. Instant pixel dimensions adjustment in your browser.
Resize photos for Instagram, Facebook, passport applications, or web performance. Our client-side resizer features aspect ratio constraints, preset social media resolutions, and high-quality multi-pass bicubic downsampling.
How to Use Resize Image Dimensions Online (Pixels, Percent & Aspect Ratio)
Select Your File
Drag and drop your file or click Browse to select from your device.
Set Target Options
Choose desired format, compression level, or customization parameters.
Convert & Download
Click Convert to process instantly in local memory and save your result.
Frequently Asked Questions
How do I keep my image from stretching or distorting when resizing?
Keep the aspect ratio lock toggled on. When you type a new width, the resizer automatically calculates and sets the proportional height according to the original aspect ratio.
What algorithm is used to scale down the image?
The resizer uses multi-step bilinear or bicubic downsampling on the HTML5 Canvas, eliminating jagged pixel stepping and aliasing artifacts.
Can I enlarge a small photo without it getting blurry?
Enlarging a low-resolution raster image cannot invent new detail that wasn’t originally captured. For photo enlargement, use our Image Enlarger tool which applies specialized smoothing filters.