📐 Image Resizer

Resize an image to exact pixel dimensions, keeping its proportions, and save it as JPEG, PNG or WebP.

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JPEG, PNG, WebP or GIF — max 20MB

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What This Tool Does

Set exact dimensions: Resize an image to a specific width and height in pixels.

Keeps proportions: Aspect ratio is locked by default, so the height follows the width automatically.

Choose the format: Save the result as JPEG, PNG or WebP.

How to Resize an Image

  1. Select your image; the width and height fields fill with its current size.
  2. Enter the width you want. With aspect ratio locked, the height is calculated for you.
  3. Choose an output format, and a quality level for JPEG or WebP.
  4. Resize and download the result.

Why Aspect Ratio Matters

Aspect ratio is the relationship between width and height. Keep it locked and the image simply gets smaller or larger; unlock it and set mismatched values, and the picture is stretched or squashed, which is immediately obvious on faces and straight lines.

If you need an exact size that does not match the original proportions, the better approach is to resize to the correct width with the ratio locked and then crop the excess, rather than distorting the image.

Choosing an Output Format

  • JPEG suits photographs and gives the smallest files, but has no transparency.
  • PNG is lossless and supports transparency, which makes it right for logos, screenshots and graphics with flat colour or text.
  • WebP generally produces smaller files than JPEG at comparable quality and supports transparency; it is well supported in current browsers.

Common Use Cases

  • Meeting a required photo size for an application or exam form.
  • Preparing a profile picture or a banner to a specified dimension.
  • Scaling large camera images down for use on a web page.
  • Converting an image to WebP to reduce page weight.

Limitations

  • One image at a time; there is no batch mode.
  • Enlarging a small image cannot add detail that was never captured, so it will look soft.
  • Saving a transparent image as JPEG replaces the transparency with a solid background.
  • There is no crop or rotate function on this page.

Privacy and Processing

Resizing is done by your own browser using a canvas. The image is never uploaded, so it stays on your device throughout.

Image Resizer FAQ

What does the aspect ratio lock do?

It keeps the relationship between width and height, so the image simply gets smaller or larger. Unlock it and set mismatched values and the picture is stretched or squashed, which is immediately obvious on faces and straight lines.

How do I hit an exact size that does not match my image proportions?

Resize to the correct width with the ratio locked, then crop the excess with a separate tool. Distorting the image to force both dimensions rarely looks acceptable.

Which output format should I choose?

JPEG for photographs and the smallest files, PNG when you need lossless quality or transparency for logos and screenshots, and WebP for smaller files than JPEG at comparable quality with transparency support.

Can I enlarge a small image?

You can, but it will look soft. Enlarging cannot add detail that was never captured in the original.

Can I resize several images at once?

No. This tool handles one image at a time.

Is my image uploaded?

No. Resizing is done by your own browser using a canvas, so the image stays on your device.

Related Developer Tools

Keep moving through common developer workflows with Image Compressor, PDF to Image, QR Code Generator. You can also browse the full Developer Tools collection or return to the all tools hub.