Picture Resizer: Resize an Image by Pixels or Percentage

Scale a photo to a percentage of its size or to exact pixel dimensions, then save it as JPEG, PNG or WebP. Everything happens on your own device.

Runs in your browserFree, no sign-upLast reviewed October 8, 2026

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Quick answers

How do I resize a photo without stretching it?: Keep the aspect ratio locked, so width and height change by the same factor. Use Percentage mode, which always scales both sides together, or Exact dimensions with Keep original aspect ratio ticked and Height (px) cleared. A 6000 x 4000 photo set to 1200 wide then becomes 1200 x 800.
How do I resize an image to exact pixels?: Choose Exact dimensions and type the width and height. If the target has a different shape from your photo, untick Keep original aspect ratio to force both numbers, which stretches the picture, or crop it to the target shape first and then resize.
Does resizing a picture reduce its file size?: Yes, when you make it smaller. Halving the width and height leaves a quarter of the pixels, and the file shrinks roughly in step. The output format and Quality setting matter as well: a PNG of a photo can be larger than the JPEG you started with.
Can I make a small picture bigger?: Yes, up to 200 percent or 10,000 pixels per side, but enlarging cannot add detail. The existing pixels are spread over a larger area and smoothed, so the result looks softer than the original. Modest enlargements of 110 to 150 percent hold up best.
What is 50 percent of a 4032 x 3024 photo?: 2016 x 1512 pixels. Both sides are halved, so the pixel count falls from about 12.2 million to about 3 million, a quarter of the original.
Is resizing the same as cropping?: No. Resizing keeps the whole picture and changes how many pixels it is made of. Cropping cuts part of the picture away. To fit a different shape without distortion, such as a square from a landscape photo, crop first and then resize.

What Image Resizer does

This picture resizer changes the pixel dimensions of a photo in one of two ways. Percentage scales both sides together, from 5 to 200 percent, so a 4032 x 3024 phone photo at 50 percent becomes 2016 x 1512. Exact dimensions takes a width and height in pixels, up to 10,000 on each side, and can keep the original proportions or stretch to the numbers you type. The result is saved as JPEG, PNG or WebP at a quality you choose, and the Details panel shows the new dimensions and file size next to the original. The picture is resized by your browser and is not uploaded.

Resize by percentage: pixel dimensions for common photo sizes

What the Scale slider produces. Megapixels are width x height divided by one million.

Scale	4032 x 3024 phone photo	6000 x 4000 camera photo	1920 x 1080 screenshot
10%	403 x 302 (0.12 MP)	600 x 400 (0.24 MP)	192 x 108 (0.02 MP)
25%	1008 x 756 (0.76 MP)	1500 x 1000 (1.5 MP)	480 x 270 (0.13 MP)
50%	2016 x 1512 (3.05 MP)	3000 x 2000 (6 MP)	960 x 540 (0.52 MP)
75%	3024 x 2268 (6.86 MP)	4500 x 3000 (13.5 MP)	1440 x 810 (1.17 MP)
150%	6048 x 4536 (27.43 MP)	9000 x 6000 (54 MP)	2880 x 1620 (4.67 MP)
200%	8064 x 6048 (48.77 MP)	Refused: 12,000 px is over the 10,000 px cap	3840 x 2160 (8.29 MP)

Results are rounded to whole pixels. Very large outputs can also exceed the memory available to a phone browser.

Exact dimensions: how width, height and the aspect ratio lock interact

With Keep original aspect ratio ticked, the tool cannot honour two numbers that disagree with the photo's shape, so one of them wins. The rule: if Height (px) is filled in and does not match the height implied by your width, the height is used and the width is recalculated. If Height (px) is empty, or equals the photo's original height, the width is used.

Width only

4032 x 3024 photo, Width 1080, Height cleared, lock on

1080 x 810

Height only

3024 x 4032 upright photo, Width cleared, Height 1350, lock on

1013 x 1350

Default 800 x 600 on a 4:3 photo

4032 x 3024 photo, Width 800, Height 600, lock on

800 x 600, because 800 x 600 is the same 4:3 shape.

Default 800 x 600 on a 3:2 photo

6000 x 4000 photo, Width 800, Height 600, lock on

900 x 600. The height of 600 is kept and the width becomes 600 x 1.5.

The result is wider than the 800 you typed. Clear Height (px) to get 800 x 533.

New width typed, old height left behind

4032 x 3024 photo, Width 1080, Height still 600, lock on

800 x 600. The leftover 600 in the height field wins.

This is the most common surprise. Clear Height (px) and the result is 1080 x 810.

Forcing a different shape

4000 x 3000 photo, Width 1200, Height 630, lock off

1200 x 630, with the picture squashed vertically. With the lock on, the same numbers give 840 x 630.

For an undistorted 1200 x 630, crop the photo to that shape first.

Common pixel sizes people resize to

Widely used target dimensions. Platforms change their recommendations, so check the current requirement for anything critical.

Use	Width x height (px)	Shape
HD video frame or thumbnail	1280 x 720	16:9
Full HD screen	1920 x 1080	16:9
4K UHD screen	3840 x 2160	16:9
Square social post	1080 x 1080	1:1
Portrait social post	1080 x 1350	4:5
Vertical story or short video cover	1080 x 1920	9:16
Link preview image	1200 x 630	About 1.91:1
Square photo for an online form, 2 x 2 inch at 300 dpi	600 x 600	1:1
4 x 6 inch print at 300 dpi	1800 x 1200	3:2
A4 page at 300 dpi	2480 x 3508	About 1:1.41

If your photo has a different shape from the target, crop it to that shape with the Image Cropper before resizing, or it will be distorted or come out at a different size.

Choosing the output format and quality

JPEG is the default and the right choice for photographs. Quality runs from 10 to 100 percent and starts at 90, which keeps a resized photo clean; 75 to 85 gives a noticeably smaller file with little visible change.

PNG is lossless and ignores the Quality slider. Use it for screenshots, logos and anything with sharp text or transparency. A photograph saved as PNG is usually much larger than the same photograph as JPEG, even after it has been made smaller.

WebP generally gives the smallest file for a given appearance and supports transparency, but some upload forms and older programs do not accept it. A browser that cannot encode WebP saves a PNG instead; the Format line in the Details panel shows what was written.

One thing to watch: JPEG cannot store transparency, and this tool does not add a background colour when resizing. A logo with transparent areas saved as JPEG comes out with those areas black. Choose PNG or WebP for transparent images.

Resizing redraws the picture from its pixels, so embedded metadata such as camera settings and GPS location is not carried into the new file.

Limits of this resizer

One picture at a time. There is no batch mode.
Dimensions are in pixels or percent only. There are no inch, centimetre or dpi fields; multiply inches by the dpi you need to get pixels, so 4 x 6 inches at 300 dpi is 1200 x 1800.
No target file size. To hit a limit in KB, resize first and then lower the quality, checking File size after each change.
Source files up to 30 MB, and output up to 10,000 pixels on each side.
Scale moves in steps of 5 percent between 5 and 200.
All the controls stay on screen in both modes. Width (px), Height (px) and Keep original aspect ratio are ignored in Percentage mode, and Scale is ignored in Exact dimensions mode.
No cropping or padding. A picture is never trimmed or given borders to reach a shape; it is either scaled in proportion or stretched.

How to get your result

1
Under Image, choose a photo up to 30 MB.
2
Set Resize by to Percentage or Exact dimensions.
3
For Percentage, move Scale. For Exact dimensions, type Width (px) and Height (px).
4
Leave Keep original aspect ratio ticked to avoid distortion. To size by width alone, clear the Height (px) field.
5
Choose Output format and Quality. JPEG at 90 percent is the default; Quality has no effect on PNG.
6
Compare Dimensions and File size with Original size, then download. The file is saved with -resized added to its name.

Frequently asked questions

Is my photo uploaded to a server?

No. The file is opened and redrawn at the new size by the canvas feature in your browser, and the resized copy is created on your device.

Why did I get different dimensions from the ones I typed?

Keep original aspect ratio is ticked and your width and height do not match the photo's shape. In that case the height you entered is used and the width is recalculated. Clear the Height (px) field to size by width, or untick the box to force both numbers.

Does resizing lower the quality of a photo?

Making a picture smaller discards pixels, but the result usually still looks sharp at its new size. Saving as JPEG or WebP adds a round of lossy compression, which the Quality slider controls. Enlarging is what visibly softens a picture.

What size should I resize photos to for email or a website?

For viewing on screen, 1600 to 2000 pixels on the longest side is plenty, and 1200 is enough for most email. A 4032 x 3024 phone photo at 50 percent, 2016 x 1512, is a convenient choice.

Can I resize a PNG and keep its transparent background?

Yes, if you set Output format to PNG or WebP. Choosing JPEG fills transparent areas with black, because JPEG has no transparency.

Why is the resized file larger than the original?

Either you enlarged the picture, or the output format is less efficient for it than the source was. A photo that started as a compressed JPEG and is saved as PNG, or as JPEG at a much higher quality, can grow even with fewer pixels.

Can I resize several pictures at once?

No. Each picture is resized and downloaded on its own.

Can I resize an image in inches or centimetres?

Not directly. Convert to pixels first: pixels = inches x dpi. A 5 x 7 inch print at 300 dpi is 1500 x 2100 pixels. The Print Size & DPI Calculator on this site works the other way, showing the size a given pixel count prints at for a chosen dpi.

Does this work on a phone?

Yes. It runs in a mobile browser and can open pictures from your photo library. Very large enlargements may fail on phones, which give web pages less memory than a computer does.