Resize Image
Change the dimensions of any image — set exact pixel dimensions, use percentage scaling, or pick a preset. Aspect ratio is preserved automatically.
Drop an image here
or choose a file
JPEG, PNG, WebP, AVIF, GIF, BMP, TIFF, SVG, HEIC and HEIF — up to 150 MB
About image resizing
Resizing changes an image's pixel dimensions — width and height — without cropping anything out. Pixuno resizes using the Canvas API's bicubic interpolation, which samples neighboring pixels smoothly when scaling, avoiding the blocky, jagged edges a naive resize produces.
The most common reason to resize is that the source is simply bigger than it needs to be: a 12-megapixel phone photo (4032×3024px, often several MB) is massive overkill for a web page, an email attachment, or a social post that will display it at a few hundred pixels wide. Resizing down not only shrinks the file, it also loads faster for whoever views it.
Typical targets: 1080px wide for Instagram, 1200×630px for a social share image (like Open Graph previews), 1600px for a blog's hero image, or a few hundred pixels for a thumbnail grid. Enable "keep aspect ratio" and you only need to set one dimension — the other follows automatically, so nothing looks stretched.
How it works
Open an image
Drop in the file you want to resize.
Set the new dimensions
Enter a width and/or height in pixels, or pick a percentage/preset. Aspect ratio locks by default.
Download the result
The resized image is generated locally and downloaded, in the same format as the original.
Why use this tool?
Sharp results at any scale
Bicubic interpolation, the same quality approach used by professional editing tools, instead of a blurry or jagged naive resize.
No file size limit from a queue
Nothing is uploaded, so there's no server-side processing queue or file size cap beyond your own browser's memory.
Aspect ratio handled for you
Lock the ratio and set one dimension — the other is calculated automatically, so proportions are never accidentally distorted.
FAQ
Will resizing change the file format?
The output format matches the original. JPEG inputs produce JPEG output; all other formats produce PNG to preserve quality.
What does "keep aspect ratio" mean?
When enabled, changing the width automatically adjusts the height (and vice versa) to maintain the original proportions and prevent distortion.
Can I make an image larger than the original?
Yes, but upscaling a raster image will reduce sharpness. For the best results, downscale rather than upscale.
What is the maximum output size?
Pixuno supports output dimensions up to 16,000 × 16,000 pixels, limited by your browser's memory.
Does resizing also compress the file?
Resizing reduces file size mainly as a side effect of having fewer pixels to encode — it does not adjust compression quality. For extra size reduction, run the result through the Compress tool.