Will resizing reduce the quality?

Making it smaller, no — the result is a genuinely smaller image. Making it larger, yes: enlargement interpolates, and it cannot create detail that was not captured.

How do I resize without stretching?

Set one dimension and leave the other to follow, which is the default. Entering both independently is what distorts, and it takes a deliberate action here.

What size should a web image be?

About twice the width it will display at, so it stays sharp on high-density screens. An image shown in a 600-pixel column wants to be around 1200 pixels wide.

Does resizing reduce the file size?

Substantially. File size scales roughly with the number of pixels, so halving both dimensions cuts the pixel count to a quarter.

Image Resizer

Changes an image's pixel dimensions, by exact size, by percentage or to fit within a box, keeping the proportions unless you ask otherwise.

Runs in your browser — nothing is uploaded

Your image

Drop an image here

or choose a file — it never leaves your browser

Result

Your processed image appears here.

Need this as an API?

Why use it

Built to be genuinely useful

Proportions kept by default

Set one dimension and the other follows. Stretching an image is almost never what somebody meant to do, so it takes a deliberate action.

Fit within a box

Give a maximum width and height and the image is scaled to fit inside both — which is the shape of most upload requirements.

Nothing is uploaded

The image is decoded and re-encoded by your browser. It never reaches a server, which matters for anything with a face, a document or a location in it.

Free, no watermark

No account, no queue, and nothing stamped across the result.

How it works

Three steps

1
Open the image.
2
Enter the target size.
3
Download the result.

Making an image larger does not add detail

Enlarging invents pixels by interpolating between the ones that exist. It cannot recover detail that was never captured, so a 200-pixel image blown up to 800 is a blurry 200-pixel image, not a sharper one.

This is worth being clear about because the interface makes both directions look equally available. Reducing is lossless in the sense that matters — the result is a genuine smaller image. Enlarging is a guess, and beyond about double it looks like one.

The dimensions that matter on a modern screen

A CSS pixel is not a device pixel. A phone with a 3× display renders a 400-CSS-pixel-wide image using 1200 device pixels, so an image sized to 400 looks soft on exactly the devices most people are holding.

The usual answer is to export at roughly twice the display width and let the browser scale it down — the file is larger but the result is sharp on both ordinary and high-density screens. Beyond 2× the returns fall away quickly and the bytes do not.

FAQ

Questions people ask

API access

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