Image Resizer — Resize by Pixels or Percent

How it works

Choose how you want to resize — to exact pixels or by a percentage — then drop your images in. Your browser redraws each one at the new size on an off-screen canvas and saves it in the format you pick, then hands the result straight back to your downloads. No upload step.

It all happens locally, so there's no queue and no size limit beyond your device's memory — and it keeps working even if your connection drops, which is an easy way to see that nothing leaves your machine.

Pixels, percent, and aspect ratio

In By pixels mode, lock the ratio and fill in just one dimension to keep the image's proportions — leave the other blank and it's worked out for you. In By percent mode, every image scales by the same amount. JPG and WebP use the quality slider; PNG is always lossless.

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<p style="font:12px/1.5 system-ui,sans-serif">Free <a href="https://ondevice-tools.pages.dev/tools/image-resizer">Image Resizer</a> — runs in your browser, no upload — by on-device.tools</p>
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