Resize Image Online – By Width, Height, Pixels, or Percentage

Resize Image

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Resize Image Online

Sometimes the problem isn’t file size — it’s the dimensions themselves. A photo that’s 4000×3000 pixels when you only need 1200×900. A graphic that needs to fit a specific slot on a page. Resize Image handles the dimension side directly, separately from (though often alongside) reducing file size.

How to Resize an Image

  1. Upload your image.
  2. Enter the width and height you need, or choose a percentage instead of exact pixels.
  3. Lock the aspect ratio if you want to keep the original proportions automatically as you change one dimension.
  4. Download.

Reduce Image Size by Pixels and Dimensions

Reduce image size pixels, reduce image size by pixels, and reduce image size and pixels all describe the same control — setting an exact width and height rather than adjusting quality. Reduce image size and dimensions and reduce image size dimensions mean the same thing. And however you think about entering the two numbers — reduce image size height and width, or reduce image size width and height — the fields work identically regardless of which order comes to mind first.

If you need a specific physical size rather than pixels — reduce image size dimensions in cm, including for a passport-style photo — set the unit to cm instead of pixels; the same width/height fields apply.

A Different Intent Worth Naming

Reduce image size without changing pixels is actually the opposite request from what this page is for — that’s asking to shrink the file size while keeping the dimensions exactly as they are, which is a compression task, not a resizing one. For that, see Compress Image or, for an exact file-size target, the Reduce Image Size in KB hub.

Resize by Percentage Instead of Exact Pixels

If you don’t know or don’t need exact pixel numbers, resizing by percentage — say, 50% or 75% of the original — scales the image down proportionally without you having to calculate the resulting width and height yourself. This is covered in more depth in How to Resize an Image by Percentage.

Related Guides

Frequently Asked Questions

What’s the difference between resizing and compressing? 

Resizing changes the pixel dimensions. Compressing changes the file size through quality and encoding, without necessarily touching dimensions. They often work together — smaller dimensions usually mean a smaller file too.

Will resizing distort my image? 

Only if you change width and height independently without keeping the aspect ratio locked — use the aspect ratio option to avoid stretching.

Can I resize by cm instead of pixels? 

Yes — useful for physical-size requirements like passport photos.

Related tools: Compress Image · Reduce Image Size in KB hub · Crop Image