Image Tools

FREE · LOCAL · NO UPLOAD

Image Resizer

Prepare image dimensions for websites, social posts, and documents while every pixel stays on your device.

✓ Your image never leaves your device
✓ The image is processed only in this browser tab and is never uploaded.

To prevent OOM, files are limited to 30 MB, input and output to 36 megapixels, either side to 16,384 px, with working memory estimated before allocation.

GUIDE & TECHNICAL NOTES

How to use Image Resizer

Resize by pixels or percentage with an optional aspect-ratio lock.

  1. 01Choose an image and review its original dimensions.
  2. 02Enter width and height or a scale percentage.
  3. 03Choose a format, resize, and download.

Preventing distortion

With aspect lock enabled, changing width or height calculates the other side automatically. Turn it off only for a fixed slot where stretching is acceptable.

Downscaling versus upscaling

Downscaling often reduces file size. Normal interpolation can smooth existing pixels when enlarging but cannot recover real detail; use the Upscaler for staged enlargement.

Frequently asked questions

Can I enter width only?

Yes. With aspect lock on, height is calculated automatically.

What is the maximum output?

To avoid memory exhaustion, output is limited to 36 megapixels and 16,384 px per side.

More image tools

Image Compressor→Image Converter→Image Cropper→Rotate & Flip Image→