Resize Images OnlineIn Pixels or Percent
Adjust photo dimensions instantly. Scale width and height in exact pixels or percentages, lock aspect ratios to prevent stretching, and download optimized files.
Drop your images here
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JPG, PNG, WebP, GIF or BMP · Multiple files supportedOutput size
Original size will appear here.
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Set an optional maximum file size.
Mastering Pixel Dimensions & Aspect Ratio
Learn how changing image width and height affects visual display and file performance.
How Pixel Resizing Works
When you adjust the width or height of a raster photo, the browser canvas interpolates color values across the new pixel grid. Downscaling (reducing dimensions from 3000px to 1000px) preserves sharp visual contrast while significantly shrinking file weight.
Proportional Locking vs. Independent Scaling
Enabling the Aspect Ratio Lock 🔗 ensures that modifying width calculates height proportionally, preventing squished or stretched subjects. Read our full Aspect Ratio Guide to learn more.