Does resizing change the file format?

No. A JPG comes back as a JPG, a PNG as a PNG, a HEIC as a HEIC. That is the difference between this and the converters — if you want a different format as well, convert first and then resize, or the other way round.

What does keeping the aspect ratio actually do?

It stops the picture being stretched. Give a width and the height is worked out for you; give both and the image is fitted inside that box rather than squashed to fill it. Turn the setting off and the width and height you type are used exactly as entered, which will distort the image unless they happen to match its proportions.

Can I make an image bigger?

Yes — the percentage options go up to 200%, and an exact width larger than the original is accepted. It cannot add detail that was never in the file, though, so an enlargement looks softer than the original. Going up more than about 50% rarely looks good.

Will my photos come out sideways?

No. Phones almost never rotate the sensor data — they record 'turn this 90 degrees when displaying it' alongside the pixels. That rotation is applied to the pixels before anything is measured or resized, so a portrait photo is resized as a portrait photo and stays upright.

Is there a limit on the size I can ask for?

Each side has to be a whole number of pixels and no more than 30,000, and the finished image cannot have more than 80 million pixels in total. Anything outside that is refused with a message rather than quietly trimmed to something you did not ask for.

Can I resize several images at once?

Yes — up to 20 in one job, each up to 50 MB. The same settings are applied to every one, so a percentage or a preset is usually what you want for a mixed batch. You can download each result on its own or take them all as a ZIP.

Is this converter free?

Yes. Every conversion on ConvertNicely is free to use, with no account, no watermark on the result and no limit on how many files you convert.

What happens to my files?

Your uploaded file is deleted from our servers the moment the conversion finishes, whether it succeeded or failed. The converted result is deleted automatically one hour later, and you can delete it yourself at any time with the Delete button.

Is there a file size limit?

Files up to 50 MB are accepted for this conversion. Larger limits apply to paid plans in future, but the free limit is generous enough for the overwhelming majority of JPG conversions.

Do I need to install anything?

No. ConvertNicely runs entirely in your browser and on our servers, so there is nothing to download or install. It works the same on Windows, macOS, Linux, Android and iOS.

Does it work on a phone?

Yes. The whole site is built mobile-first, so you can upload from your camera roll or files app, convert, and download the result without leaving your browser.

Free

Resize Images

Set an exact width and height, scale by a percentage, or pick a common size — and the picture comes back in the format it went in as. Transparency survives, photos taken on a phone stay the right way up, and you can do a batch at once with the same settings applied to every one.

Also known as: image resizer · photo resizer · change image size

Files up to 50 MBTypically under a minute

Drop your files hereor choose a file from your deviceJPG, PNG, WebP, HEIC, BMP, TIFF, GIF or AVIF · up to 50 MB · up to 20 files

Encrypted upload · deleted right after conversion

Your files are deleted automatically

Uploads are removed as soon as processing finishes, and converted files are deleted after 1 hour. Read our privacy policy.

How to resize images

Step 1
1. Add your files
Drag up to 20 JPG, PNG, WebP, HEIC, BMP, TIFF, GIF or AVIF files into the box, or choose them from your device. Each can be up to 50 MB.
Step 2
2. Choose your settings
Fill in “Width” and “Height”. Adjust Resize by (Custom dimensions), Keep aspect ratio (on) and Remove metadata (on), or keep the starting values in brackets, which suit most files. Some choices show further settings. More are under Advanced options.
Step 3
3. Press Resize images
The work happens on our servers, and you can follow its progress.
Step 4
4. Download the result
Each file comes back in the format it went in; several come together in a ZIP. Your upload is already deleted, and the result is deleted after one hour.

Worth knowing

Making an image larger cannot add detail that was never captured, so an enlargement will look softer than the original. Animated GIFs and WebP files are resized from their first frame only, and the result is a still image.

Why resize images?

Meeting a fixed size a website, CMS or marketplace insists on
Cutting page weight by serving images at the size they are displayed
Making a batch of photos a consistent width for a gallery or a document
Getting a phone photo under an upload limit without changing its format

What changes

What resize images changes, and what it leaves alone
Property	Before	After
Format	Unchanged	Unchanged
Dimensions	Original	The size you choose
Transparency	Preserved	Preserved
Orientation	As taken	Corrected and kept

Frequently asked questions

Page updated 3 October 2026

All Image converters

Resize Images

How to resize images

1. Add your files

2. Choose your settings

3. Press Resize images

4. Download the result

Why resize images?

What changes

Frequently asked questions

Compress Image

JPG to WebP

PNG to JPG

HEIC to JPG

Resize Images

How to resize images

1. Add your files

2. Choose your settings

3. Press Resize images

4. Download the result

Why resize images?

What changes

Frequently asked questions

Does resizing change the file format?

What does keeping the aspect ratio actually do?

Can I make an image bigger?

Will my photos come out sideways?

Is there a limit on the size I can ask for?

Can I resize several images at once?

Is this converter free?

What happens to my files?

Is there a file size limit?

Do I need to install anything?

Does it work on a phone?

Related conversions

Compress Image

JPG to WebP

PNG to JPG

HEIC to JPG