Image resizer

Changes the pixel width and height of an image, with optional aspect-ratio lock, percentage scaling and common presets.

By The FreeImageEditor editorial teamLast reviewed How we test

Drop an image here

JPG, PNG, WebP, GIF (first frame), BMP, AVIF · up to 60 MB · processed on your device

Fewer pixels across, so the file and the layout both shrink.

How to use it

  1. 1Add your image. The current dimensions appear immediately.
  2. 2Type a new width or height, or use a percentage. Keep the ratio locked unless you deliberately want to distort the image.
  3. 3Choose an output format and download.

Resizing down is safe, resizing up is not

Scaling an image down discards pixels and generally looks clean. Scaling up has to invent pixels that were never captured, so the result is soft — a 400px image stretched to 1600px will never regain the detail. If you need a large version, start from the largest original you have.

Aspect ratio, and why the lock matters

The aspect ratio is width divided by height. Change one side without the other and the picture is stretched: faces widen, circles become ovals. With the lock on, entering a width fills in the matching height automatically.

When you need an exact ratio that does not match the source — a 1:1 avatar from a landscape photo, for example — crop first, then resize. Cropping removes the parts you do not need instead of squashing them.

DPI does not affect a screen image

DPI or PPI is a print instruction. On screen only the pixel dimensions matter: a 1000×1000 image at 72 DPI and the same image at 300 DPI are the same file on a web page. DPI becomes relevant when you send the file to a printer, where 300 DPI at your intended physical size is the usual target.

Frequently asked questions

Which size should I use for a website?
Match the largest size the image is actually displayed at, then roughly double it for high-density screens. A full-width hero on a 1440px layout is usually fine at 2000–2400px wide.
Does resizing reduce file size?
Yes, and it is usually the single biggest saving available — halving both dimensions removes about 75% of the pixels. Resize before compressing.