Private image operation
Resize Image
Resize JPG, PNG, and WebP files locally in your browser. Choose target dimensions, keep the original aspect ratio when needed, and download the resized image in the same format.
Files
No files selected yet.About browser image resizing
This tool reads each image locally, sends the resize work to a Web Worker, draws the image to an OffscreenCanvas at the target size, and downloads the result without uploading the file.
Downscaling can reduce pixel dimensions and file size. Upscaling makes a larger file, but it cannot recover detail beyond what the original image already contained.
FAQ
Are images uploaded for resizing?
No. The image is decoded and resized in a local Web Worker, then downloaded from a local blob URL.
Does resizing change the image format?
No. JPG stays JPG, PNG stays PNG, and WebP stays WebP. Use a converter page when you need a different output format.
Can resizing make a small image sharper?
No. Enlarging an image creates more pixels, but it cannot add real detail that was not in the original file.
What does aspect-ratio lock do?
When the lock is enabled, each file keeps its own original proportions and the worker computes the other dimension from the value you changed.