The two ways to change image size in Photoshop

Photoshop offers two separate commands for resizing: Image Size changes the dimensions of the entire canvas and all layers together, while Scale resizes just the selected layer or content. Most of the time you want Image Size. Open your image, go to the Image menu, click Image Size, and enter your new width or height — Photoshop will adjust the other dimension automatically if you keep the chain link icon connected.

If you only want to resize one layer instead of the whole image, use the Scale tool instead. Select the layer in the Layers panel, go to Edit > Scale, grab a corner handle, and drag. This leaves your canvas unchanged and only affects that single layer.

Key Takeaways

  • Image Size (Image menu) resizes the entire image and all layers at once, and is the command most people need.
  • The chain link icon in the Image Size dialog keeps width and height proportional — click it to break the link if you want to stretch or squash the image.
  • Scale (Edit menu) resizes only the selected layer, leaving the canvas and other layers untouched.
  • Resampling method matters when you enlarge an image — Bicubic Sharper for reduction, Bicubic or Lanczos for enlargement to avoid blurriness.

Using Image Size for the whole image

The Image Size dialog is where you control the overall dimensions. Go to Image > Image Size. You will see three fields: Width, Height, and Resolution. The chain link icon between Width and Height locks them together — as long as it is linked, changing one automatically adjusts the other to keep the image proportional. Click the chain to unlink them if you want to stretch or compress the image without keeping the aspect ratio.

The Resolution field controls how many pixels per inch the image contains. Changing resolution does not change the pixel count — it only changes how large the image will print. If you are preparing for print, ask your printer what resolution they need (usually 300 dpi). For web, 72 dpi is standard, though the number matters less since screens display pixels at their own size regardless.

At the bottom, you will see a Resampling dropdown. This controls how Photoshop adds or removes pixels when you resize. For making images smaller, choose Bicubic Sharper. For making images larger, choose Bicubic or Lanczos — these methods add pixels more smoothly and reduce blurriness. Nearest Neighbor is only useful for pixel art where you want hard edges.

Using Scale to resize a single layer

Scale resizes only the layer you have selected, leaving the canvas size and all other layers unchanged. Select the layer you want to resize in the Layers panel, then go to Edit > Scale. Photoshop will draw handles around the layer. Drag a corner handle to resize while keeping proportions, or drag an edge handle to stretch in one direction only.

Hold Shift while dragging a corner to constrain proportions. When you are done, press Enter or click the checkmark to apply the change. If you want to undo and try again, press Escape before confirming.

Keeping proportions locked or unlocked

The chain link icon in Image Size controls whether width and height change together. When linked (the chain appears connected), changing the width automatically adjusts the height by the same percentage, so the image stays proportional. This is usually what you want — if you reduce width to 50 percent, height becomes 50 percent too.

Click the chain to break it if you need to change width and height independently. This lets you stretch or compress the image. Be aware that breaking the chain often makes images look distorted, so use it only when you have a specific reason.

Resampling methods and when to use each

Resampling is how Photoshop calculates new pixels when you resize. The method you choose affects image quality, especially when enlarging.

Bicubic Sharper is best for making images smaller. It removes pixels while keeping edges defined.

Bicubic and Lanczos work well for enlarging images. They add pixels by averaging surrounding colors, which produces smoother results than Nearest Neighbor. Lanczos is slightly sharper but slower.

Nearest Neighbor is only for pixel art or retro graphics where you want hard, blocky edges. It makes photographs look terrible when enlarged.

Preserve Details (available in newer Photoshop versions) uses machine learning to enlarge images more intelligently, reducing blur and artifacts. It is slower but produces better results than standard methods when you need to go significantly larger.

Resizing for web versus print

Web images and print images have different size requirements. For web, you typically work in pixels and do not worry about resolution — a 1200 × 800 pixel image is a 1200 × 800 pixel image regardless of the resolution setting. Most websites display images at 72 dpi, but the pixel dimensions are what matter.

For print, resolution becomes important. A 4 × 6 inch photo at 300 dpi needs to be 1200 × 1800 pixels. If you have a 1200 × 800 pixel image and want to print it at 4 × 6 inches, you would set the resolution to 300 dpi in Image Size, but the pixel count stays the same — the image will just print smaller or require resampling up to reach 300 dpi, which may reduce quality.

The safest approach: if you know your final size and resolution before you start, resize early. If you are resizing an existing image to print larger than its original size, use Preserve Details or Lanczos resampling and accept that some softness is unavoidable.

Common mistakes and how to avoid them

The most common mistake is enlarging an image too much. Photoshop cannot create detail that was not there — if you enlarge a small image significantly, it will look blurry or pixelated no matter which resampling method you choose. If you need a larger image, start with the largest original file you have.

Another mistake is confusing Image Size with Scale. If you use Scale thinking you are resizing the whole image, you will only resize one layer and wonder why the canvas did not change. Remember: Image Size for the whole image, Scale for one layer.

A third mistake is changing resolution without understanding what it does. Changing resolution in Image Size does not change the pixel count — it only changes how large the image prints. If you want to actually change the number of pixels, you must change the width or height fields, not the resolution.

Frequently Asked Questions

Can I make an image bigger without it getting blurry?

Not without limits. Photoshop can enlarge an image, but it cannot create detail that was not there. Use Lanczos or Preserve Details resampling to minimize blur, but expect some softness if you enlarge more than 20 to 30 percent. Starting with the largest original file you have is the best approach.

What is the difference between Image Size and Canvas Size?

Image Size resizes the actual image and all its content. Canvas Size adds or removes space around the image without changing the image itself — useful for adding borders or room for text. Canvas Size is in the Image menu below Image Size.

Why does my image look pixelated after resizing?

You probably enlarged it too much or used Nearest Neighbor resampling. Try undoing, then use Lanczos or Preserve Details instead. If the image was very small to begin with, some pixelation is unavoidable — Photoshop cannot invent pixels that do not exist.

Do I need to change resolution for images I am posting online?

No. Websites ignore the resolution setting and display images based on pixel dimensions alone. A 1200 × 800 pixel image displays at 1200 × 800 pixels on screen regardless of whether the resolution is set to 72 dpi or 300 dpi. Resolution only matters for printing.

What happens if I unlink the chain in Image Size?

Width and height will change independently. You can make the image wider without making it taller, or vice versa. This stretches or compresses the image and usually makes it look distorted, so use it only when you have a specific reason to change proportions.