Are my images uploaded anywhere?

No. The work happens in your browser and nothing is sent to sona.to.

Can I make a small image larger?

You can, but the detail that was never there cannot be invented, so the result looks soft. Longest side deliberately refuses to enlarge for this reason.

What size should I use for a web page?

Around 1600 pixels on the longest side covers most uses, and 2400 if the image is meant to fill the width of a large screen. Anything beyond that is usually wasted.

Why did my PNG get bigger?

PNG stores every pixel exactly, and photographs have a lot of them. Saving a photograph as PNG almost always produces a larger file than the JPEG it came from. Use JPEG or WebP for photographs.

The quality slider does nothing.

It has no effect when the format is PNG, because PNG never throws anything away. Switch to JPEG or WebP and it will.

Does this remove the location and camera details?

As a side effect, yes, because the picture is drawn again and the data around it is not carried over. If that is all you want, do not resave the picture. Use the EXIF Remover, which takes the data out and leaves the picture untouched.

Can I resize a HEIC from my iPhone?

Yes, in any browser. HEIC needs a decoder that most browsers do not have, so one is fetched the first time you open such a file, which takes a moment. The result comes back as JPEG, since HEIC cannot be written here.

How many images can I do at once?

Up to forty. They are processed one after another so a large batch takes a moment, and everything stays on your device throughout.

Home / Free tools / Image Resizer

Image resizer, compressor and converter

Change the size of an image, make the file smaller, or save it in another format.

Three jobs that are really one. An image is drawn at the size you ask for, then saved again at the quality you ask for, in the format you ask for. Set any of the three, or all of them. Drop in a folder of images and the same settings apply to every one. To take the location and camera details out of a photo without changing the picture at all, use the EXIF Remover.

Drop images here

Everything happens in your browser. No image is sent anywhere.

Why a photo from a phone is so large

A recent phone takes pictures wider than any screen most people own. Sent as they are, those files are slow to load and slow to open, and the extra width buys nothing on a page or in a message. Bringing the long side down to around 1600 pixels is usually enough for anything shown on a screen, and often cuts the file to a tenth of what it was.

The picture is drawn again

Unlike removing the data around a picture, changing its size or its quality means drawing it again, and something is always lost. The loss is small and hard to see at sensible settings, but it adds up if you keep resaving the same file. Work from the original each time rather than from a copy you already shrank.

Choosing a format

JPEG suits photographs and is understood everywhere. PNG keeps transparency and never loses detail, which makes it right for logos and screenshots and wrong for photographs, where it produces very large files. WebP is smaller than JPEG at the same quality and every current browser reads it, so it is a good default for anything going on a web page.

Aiming at a file size

Some forms and portals refuse anything over a set size. Give the number and the quality is lowered step by step until the file fits, then stops. The result is the best quality that stays under the limit rather than the first one that happens to fit.

What it does

All of it in the browser, on as many images as you drop in.

Size

Longest side
Width and height
Percentage

File size

Quality setting
Aim for a size in KB
Before and after comparison

Format

JPEG
PNG
WebP

More than one at a time

Same settings for every image
One download each
All of them as a zip

How to use it

Add your images

Drop them in or choose them. They are read by the browser and never sent anywhere.

Set the size

Longest side is the one to reach for if you are not sure. It keeps the shape of the picture and never makes an image bigger than it started.

Set quality and format

Leave the format as it is to keep what you started with, or pick one. Use the file size box when something has to fit under a limit.

Download

One at a time, or everything together as a zip.

What these words mean

Pixel

One dot of the picture. An image described as 4000 by 3000 is 4000 dots across and 3000 down, which is twelve million dots in total.

Aspect ratio

The shape of the picture, meaning how its width compares to its height. Keeping it means the picture is never squashed or stretched, only made larger or smaller.

Lossy

A way of saving a picture that throws away detail to make the file smaller. JPEG and WebP work this way. PNG does not, which is why the quality setting has no effect on it.

Questions