What do width and height mean?
Width and height are the output dimensions in pixels. With aspect ratio locked, changing one value updates the other to keep the image's original proportions.
Image Resizer
Resize one JPG, PNG or WebP image with aspect-ratio controls, percentage options, practical size presets, local preview and download.
Upload
Choose one JPG, PNG or WebP image. Maximum 10 MiB, 8,192 pixels per side and 16 megapixels.
Drop one image hereJPG, JPEG, PNG or WebP
Choose one image to begin.
Your image is processed in your browser and is not uploaded to our servers.
What this tool does
Image Resizer changes the pixel width and height of one JPG, PNG or WebP image using your browser's built-in canvas and image encoders.
How to use it
- Upload one supported image and review its original dimensions.
- Enter pixel dimensions, keep the aspect ratio locked, or choose a percentage or exact-size preset.
- Resize the image, check the local preview and dimensions, then download the generated file.
Example input and output
Input: A 2400 × 1600 pixel JPG resized to 50%
Output: A locally generated 1200 × 800 pixel JPG
Common use cases
- Preparing images for websites and presentations
- Creating common landscape, square, or portrait dimensions
- Reducing pixel dimensions before sharing an image
FAQ
Does making an image larger improve its quality?
No. Upscaling creates more pixels but cannot recreate detail that was not present in the original image.
Which formats can I use?
You can upload JPG, JPEG, PNG, or WebP and export JPG, PNG, or WebP when the selected encoder is supported by your browser.
Is my image uploaded?
No. Validation, resizing, preview, and download happen locally in your browser without an image-processing API.