Image Resizer
Set a maximum width and height and the tool scales each image to fit inside it, preserving the aspect ratio. Good for preparing photos for a website, an upload form, or an email.
100% private — everything runs in your browser, nothing is ever uploaded.
What this tool does
A job application portal rejects a headshot because it wants a maximum width of 1200 pixels, while a conference site insists on a square avatar no larger than 400 pixels. Both are dimension problems, not file-size problems, and shrinking bytes will not fix either one. This tool scales a batch of images to fit inside a maximum width and height that you specify, keeping the aspect ratio so nothing is stretched or cropped. It is equally useful for preparing a set of blog images to a consistent width before publishing, or for reducing phone photos before pasting them into a document. The resized file name records the new dimensions, which makes it easy to tell versions apart when several sizes of the same picture sit in one downloads folder.
How to use it in three steps
- Add every image that needs the same maximum box. Batch processing keeps a whole set of photos consistent instead of resizing them one by one with slightly different settings.
- Type the maximum width and height in pixels. Leave Allow upscaling switched off unless a form genuinely demands a larger minimum size, since enlarging a bitmap cannot add detail.
- Press Resize and download the results. If a form also has a byte limit, run the resized copies through the image compressor afterwards to satisfy both constraints. Give the output files a distinct folder so resized copies never overwrite the originals.
Questions people ask
Will my pictures be cropped or distorted?
No. Each image is scaled by whichever ratio is smaller, so it fits entirely inside the box you set and its proportions stay exactly as they were. A wide landscape and a tall portrait simply end up with different long edges.
Should I turn on upscaling to meet a minimum size?
Almost never. Enlarging a raster image invents no new detail; it produces a soft, blurry picture that is also larger on disk. If a source is too small, reshoot or request a higher-resolution original instead.
Does resizing also reduce the file size?
Usually yes, because fewer pixels need to be stored, but the amount depends on the content. For a hard byte ceiling such as 200 KB, resizing alone is unreliable; pair it with the compressor's quality setting.
What size should I use for a website hero image?
A width around 1600 pixels covers most desktop layouts without shipping a phone photo's full 4000 pixels, and a separate smaller copy suits mobile. Resize to the width your layout actually displays, then compress that copy. There is no benefit in serving a file far wider than its container.
Privacy: Resizing happens through your browser's own canvas in local memory, so ID photos, contracts and personal pictures are scaled on your machine without any upload or remote processing step.
How to use it
- Add your images to the drop area.
- Enter the maximum width and height in pixels, and leave Allow upscaling off unless you really want small images enlarged.
- Press Resize and download the results — the filename records the new dimensions.
Why it stays private
Scaling is done with the browser's own image decoding and canvas scaling, all in memory. Files are never copied off your device, which matters when you are preparing things like ID documents or contracts to fit a size limit.
Questions
Does it keep the aspect ratio?
Yes, always. Each image is scaled so that it fits inside the box you specify, and the smaller of the two ratios wins. Nothing is stretched or cropped.
Should I enable upscaling?
Almost never. Enlarging a raster image cannot add detail that is not there — the result is soft and larger in file size. Leave the box unchecked unless you specifically need to hit a minimum dimension for a form.
Will the output be sharper than my image editor?
No. This is a fast convenience tool using the browser's scaler, which is good but not a match for a dedicated editor with Lanczos resampling. For critical work, use professional software.