Resize Image

How it works

Resize Image redraws your picture onto an HTML canvas at the exact width and height you enter, then re-exports it with your browser's own image engine. Nothing is ever uploaded — the scaling, resampling and encoding all happen locally on your device, so your file never leaves your computer. As soon as you drop an image, its current pixel dimensions are filled into the Width and Height fields automatically, so you can fine-tune from there instead of typing numbers from memory.

How to resize an image

Drop a JPG, PNG or WEBP file into the box, or click to browse. The tool reads the image's natural size and fills in both fields for you. Type the pixel width and height you want — the values are plain pixel numbers, not percentages — then press Resize. If "Keep aspect ratio" is checked, editing one field recalculates the other so the picture is never squashed or stretched; uncheck it when you need deliberate non-proportional dimensions, such as a fixed banner size. When the preview appears, click Download to save the resized file under a new name.

A concrete example

Suppose you have a 12-megapixel photo, 4000 × 3000 px, and you want a 1200-px-wide version for a blog. Type 1200 into the Width field: with the aspect-ratio lock on, the Height updates to 900 automatically, preserving the original proportions. The tool redraws the canvas at 1200 × 900 px using high-quality smoothing and hands you a lighter image that loads much faster on a web page. Type the same width while the lock is off and you can stretch it to any height you like — the exact dimensions you enter are the exact output size.

What to expect

The width and height are interpreted strictly in pixels — there is no percentage option; the numbers you enter become the actual output dimensions. The aspect-ratio lock is on by default and can be switched off for free-form resizing. Output keeps the source format: PNG and WEBP stay PNG and WEBP, and any other format (including JPG) is exported as a JPG at a quality of 0.92, while transparency is preserved in PNGs. Resizing down always looks clean and sharp; enlarging beyond the original size softens detail, because the browser has to invent pixels that were never captured.

Common problems and fixes

If the Resize button stays disabled, you haven't loaded an image yet — drop a file or click to browse first. If you enter an empty, zero or very small size, the tool simply won't run; make sure both Width and Height are integers of at least 1. A stretched or squashed result means the aspect-ratio lock was off while you changed only one dimension — re-enable it and adjust a single field. For the sharpest upscales, start from a larger original rather than enlarging a small file, since enlarging can only stretch the pixels that exist.

Frequently asked questions