Resize an image: pixels, percent or print size
Make pictures larger or smaller: to exact pixels, a percentage, or a print size at 300 DPI.
With both sides typed, each picture is fitted inside them. Leave one empty to have it follow.
or drop them here. It stays on your device: nothing is uploaded.
How to resize an image
- 1Choose howPixels for an exact size, Percent to scale by a share, or Print size for inches or centimeters at a DPI.
- 2Add your picturesChoose or drop up to 30. They are resized at once, and again whenever you change a setting.
- 3DownloadOne at a time, or Download all for a ZIP. The new size is in each file name.
Resizing for print
A printer needs a number of pixels for every inch it prints: 300 for things seen up close, 150 for posters seen from a step back. Print size does that sum for you and writes the DPI into the JPG or PNG, which most free resizers leave at 72.
Making a picture larger
Any resizer can make a picture larger, but none can add detail that was not in it: the extra pixels are worked out from their neighbors, so a picture made twice as large looks softer. When a small AI image has to fill a shirt or a poster, the AI upscaler redraws the detail instead.
Nothing is uploaded
The resizer works in your browser, on your own device. Pictures are saved fresh, so camera data and GPS position are left behind.
Read more on the blog
- Best DPI and Upscaling Settings for Midjourney and AI T-Shirt Prints
- How to design and print your own merch with SlapMake
Questions people ask
How do I resize an image without losing quality?
Making a picture smaller loses nothing you can see: the resizer shrinks it in steps, so edges stay smooth. Making it larger cannot add detail that was never there, so it looks softer the more it grows. For a picture that has to be larger and sharp, use the AI upscaler, which adds detail.
How do I resize an image for printing?
Choose Print size, pick a size from the list or type one in inches or centimeters, and choose 300 DPI. Each picture is fitted inside that size at 300 pixels per inch, and the JPG or PNG is saved saying 300 DPI, so print software opens it at the right size.
How do I change the DPI of an image?
Use Print size: the picture is made with the pixels that size needs at the DPI you choose, and the DPI is written into the file. Changing only the DPI number in a file does not change how sharp it prints; the pixels across each inch do.
How do I resize without stretching the picture?
Leave Keep the shape on. With both sides typed, each picture is fitted inside them; with one side typed, the other follows. Turn it off only when you want exactly that width and height, even if the picture is squeezed.
Are my images uploaded?
No. The resizer runs in your browser: pictures are opened and saved on your own device and never sent to SlapMake or anyone else. Camera data and GPS position are not copied into the new files.
How many images can I resize at once?
Up to 30 at a time, each up to 50 MB and 100 megapixels. They are all resized the same way, and each keeps its own shape unless Keep the shape is off.
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