Image Resizer
Measured, not guessed.
About the Image Resizer
This tool changes the pixel dimensions of one or many images at once, either by typing exact numbers, choosing a ready-made preset (Instagram post, YouTube thumbnail, print photo sizes, and more), or by dragging a selection box to crop and resize in one step. It's built for the everyday sizing jobs a photo editor is overkill for: fitting a photo to a social platform's spec, shrinking a wallpaper-sized image before it goes on a web page, or batch-resizing a folder of product shots to the same dimensions.
To use it: drop images onto the page, then either drag the selection frame on the preview to choose which part of the photo to keep, or leave it at "full image." Set your target size under Dimensions, in pixels, percent, or inches/cm/mm at a given DPI for print, and use the chain-link button to lock the aspect ratio so width and height scale together. Pick an output format if you want to convert it, then download the current image or click "Apply to all" and grab every image as a ZIP.
All resizing runs locally in your browser on an HTML canvas, nothing is uploaded to a server, so there's no size limit beyond what your own device's memory can comfortably handle.
Tips: if you're only making an image smaller, quality stays sharp; scaling up (upscaling) is flagged with a badge on the preview since stretching pixels beyond their original resolution always looks a bit softer. For print sizes, double-check the DPI field, 300 is standard for photo prints, while 72–150 is typical for on-screen use.
Frequently asked questions
How does locking the aspect ratio work?
Click the chain-link button next to the width and height fields. Once it's active, typing a new width automatically recalculates the height (and vice versa) to keep the same proportions as your current selection, so the image can't get stretched or squashed.
What happens if I resize an image larger than its original size?
The tool will do it, but a warning badge ("upscaling, softer result") appears on the preview. Scaling up doesn't invent new detail, it stretches the existing pixels, so the result is generally softer than a native image at that size, especially at large scale-up factors.
Is there a limit to how many images I can resize in one batch?
No fixed limit on the count, add as many as you like. Each individual image is capped at about 40 megapixels as a safety guard against freezing the browser tab; anything above that is skipped and marked in the batch list instead of stalling the page.
Does resizing strip EXIF data like camera info or GPS location?
Yes. Because the image is redrawn onto a canvas to produce the resized output, embedded metadata such as camera model, capture date and GPS coordinates is dropped, the one exception is orientation, which is detected up front and baked into the result so rotated photos come out right-side up.
Can I crop and resize at the same time?
Yes, drag the selection frame on the preview to any position or size (grab a corner handle to resize it, or the middle to move it). Only the area inside that box is used as the source for the resize, so you can crop to a subject and scale it to your target dimensions in one pass.
What units can I use, and how does DPI factor in?
Pixels, percent of the current selection, or physical units, inches, centimeters or millimeters, for sizing print output. When you choose a physical unit, the DPI field converts it to pixels (for example, 4×6 in at 300 DPI becomes 1200×1800 px), matching what most photo labs expect for print quality.