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ToolPika

Image Resizer

Choose a percentage or a width and height, then add your images. They are resized on your device and never uploaded.

Resize by
Save as
90%

For JPG and WebP. 85–90% keeps photos sharp.

Runs in your browser. Nothing you enter is sent to a server.

How it works

Each image is decoded by your browser, drawn at the new size with high-quality smoothing and saved again. Everything happens on your device in a background thread, so the page stays responsive and your photos stay private.

There are two ways to set the size:

  • Percentage. 50% halves both the width and the height. A 4000 × 3000 photo becomes 2000 × 1500.
  • Width and height. Enter one side to keep the proportions (1920 wide turns 4000 × 3000 into 1920 × 1440), or both to fit the image inside that box. Untick “Keep aspect ratio” only if you really want the exact size, even if the image gets stretched.

Save as keeps the original format by default. Choose JPG or WebP for photos, or PNG for screenshots, logos and images with transparency. Each result shows the old and new size in pixels and in file size.

Choosing a size

Use Width that usually works
Email attachments and messaging 1280–1600 px
Blog posts and websites 1200–1920 px
Full-screen backgrounds (Full HD) 1920 px
4K screens 3840 px
Thumbnails 150–400 px

Very large images are limited to 16.7 megapixels (for example 4096 × 4096), the largest size some browsers, including Safari on iPhone, can process. The result tells you when this limit applies.

Good to know

  • Resizing removes photo metadata such as GPS location and camera details, and applies the camera’s rotation first.
  • Resizing the same image down and up again loses detail each time; always resize from the original.

Frequently asked questions

How do I resize an image without distorting it?

Keep "Keep aspect ratio" ticked. If you enter only a width (or only a height), the other side is calculated from the original proportions. If you enter both, the image is scaled to fit inside that box without stretching.

Can I make an image bigger?

Yes, up to 400%, but enlarging cannot add detail that was not in the original, so large enlargements look soft. For sharp results, start from the largest version of the image you have.

Does resizing reduce the file size?

Making an image smaller in pixels almost always makes the file much smaller too, because there are fewer pixels to store. Halving the width and height leaves a quarter of the pixels.

Can I resize many images at once?

Yes. Add up to 20 images; each is resized with the same settings, and you can download them one by one or all together.

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