What this image resizer does
Websites are forever asking for pictures at exact sizes: a marketplace that wants product photos at least 2000 pixels wide, a profile that demands a square 400 × 400, a form that rejects anything over a certain dimension, a slide or document where a five-megabyte phone photo is simply too much picture. This resizer changes an image's pixel dimensions to the numbers you type — wider, narrower, or both — and saves the result as PNG, JPEG or WebP. Load a picture and the tool tells you its current size, pre-fills the boxes with it, and does the maths for the other side whenever proportions are locked.
The proportions lock deserves a word of its own, because it is the difference between a resized picture and a ruined one. A photograph has a shape — its aspect ratio. If you change the width without changing the height by the same percentage, the picture does not get smaller, it gets stretched: faces widen, circles become ovals, products look wrong. With the lock on (it starts on), typing a new width works out the matching height automatically, and the same in reverse. Turn it off only when a destination demands an exact rectangle and you accept some distortion — or better, crop the picture to the right shape first with our Image Cropper, then resize the crop.
How to resize an image
- Choose the image. Its current width, height and file size appear immediately.
- Type the new width (or height). With proportions locked, the other box fills itself in.
- Choose an output format. PNG is the faithful default; JPEG gives smaller files for photographs.
- Press Resize, check the preview and the new size, and download. The filename includes the new dimensions, like "photo-800x600.png".
Making pictures bigger, and other honest limits
You can type a size larger than the original, and the tool will obey — but it cannot invent detail that was never captured. An enlarged image is the same information spread over more pixels, which looks soft or blocky, a fact no resizer can repeal. Where a site demands a minimum size (marketplaces do this because zoom needs pixels), enlarging a slightly-too-small photo often passes and looks acceptable on screen; enlarging a tiny thumbnail into a poster will not fool anyone.
Shrinking, by contrast, is this tool's home turf, and it has a welcome side effect: smaller dimensions mean smaller files, often dramatically. A 4000 × 3000 phone photo resized to 1200 × 900 for a blog post can drop from five megabytes to a few hundred kilobytes before any compression is applied. If the file still needs to be smaller afterward, our Image Compressor is the natural next stop — resize first for dimensions, compress second for bytes.
Frequently asked questions
What does 'keep proportions' actually do?
It locks the picture's aspect ratio. Type a new width and the height is calculated automatically so the picture shrinks or grows evenly — no stretched faces or squashed products. With it off, width and height are applied exactly as typed, even if that distorts the image.
Can I make a small image bigger?
Yes, but the result will look soft — resizing cannot invent detail that was never in the picture. Modest enlargements (up to about double) usually look acceptable on screen.
What size should I use for common jobs?
Profile pictures: 400×400 or 800×800. Blog and article images: 1200 pixels wide is a good standard. Email attachments: 1600 pixels on the long side balances clarity and file size. Marketplace zoom: 2000 pixels or more on the longest side.
Does resizing reduce the file size too?
Usually, a lot. Fewer pixels means less data, and resizing a large phone photo to web dimensions commonly cuts the file by 80–95% before any compression.
Private by design: resizing happens in your browser's canvas. Your image never leaves your device — there is no server on our side receiving pictures at all.