Free Image Resizer

How to resize an image

1. Pick a picture from your phone or computer.
2. Tap a quick percentage, or type the exact width you need.
3. Leave "keep the original proportions" ticked so nothing stretches.
4. Choose JPG for sharing, PNG for transparency, WebP for the smallest web file.
5. Download — the new file saves straight to your device.

Resize first, compress second

A 12-megapixel phone photo displayed in a 600-pixel-wide blog column is carrying twenty times the pixels it will ever show. Cutting the dimensions to what the page actually uses is the single biggest saving available, and it costs nothing visually because those extra pixels were never on screen.

Going the other way — making a small picture bigger for print or a large screen — needs more care than typing a bigger number: a single big jump looks soft and blocky. The image upscaler enlarges 2×, 3× or 4× in smooth steps and sharpens the edges afterwards, and has a crisp mode for pixel art.

Need one exact size, every time?

There is a page for each of the sizes people ask for most — favicon and icon sizes, the Amazon and Etsy listing sizes, podcast artwork, the social square, the link preview card, Full HD. Each one presets the target, explains where that size is actually required and covers what usually goes wrong. See the tools hub for the full list.

Sizes worth knowing

Why the pixels matter more than the quality slider

People usually reach for a compression setting first and dimensions second. That is backwards. Halving the width and height of an image removes three quarters of its pixels, and a pixel that is not there costs nothing to store and cannot be compressed badly. Dropping quality, by contrast, damages the pixels you keep — and on text, logos and hard edges that damage is visible long before the file gets small.

The order that works: crop away anything you do not need, resize to the largest size the image will actually be displayed at, and only then reach for compression. Most images that are "too big for email" are solved entirely by the first two steps.

Enlarging is not the same as resizing

Making an image smaller discards information, which is safe. Making it larger invents information, which is not. A browser-based resize uses bilinear or bicubic interpolation: it averages neighbouring pixels to fill the new ones. That looks acceptable up to about 150% and soft beyond it, because there is no extra detail to recover — only a smoother guess at what was between the original pixels.

If you need a larger version, go back to the original file. A camera original, a RAW export or the vector source will always beat an upscale of a small JPG. When there is genuinely no larger original, keep the enlargement modest and expect softness rather than detail.

Keeping proportions

Leaving "keep the original proportions" ticked means typing one dimension and letting the other follow. Unticking it lets you force an exact width and height, which will stretch or squash the picture. That is occasionally what you want — filling a fixed banner slot, for instance — but it is the single most common way a resized photo ends up looking wrong. If you need an exact shape, crop to that shape first and then resize.

Formats after resizing

• JPG — photographs going to email, listings, documents and print.
• PNG — screenshots, diagrams, logos, anything with transparency or text.
• WebP — images for your own website, where it is roughly a quarter smaller than JPG at matched quality.