Image Resizing Guides
These guides explain the rules behind a photo upload: pixel sizes, file size limits in KB, DPI, print sizes, formats and passport photo backgrounds. Each is checked against official sources or measured with this site's own tools, and links to the tool that does the job in your browser.
Phone Wallpaper Sizes in Pixels
Wallpaper sizes for the iPhone 17, Galaxy S26 and Pixel 11 phones, from the makers' spec pages, and one file that fits them all without enlarging.
Compress Images Without Losing Quality
Five photos measured at every JPEG quality: how close each stays to the original, what re-saving does, and why lossless saves almost nothing.
Take a Passport Photo at Home
Take a passport photo at home: who may take it, where to stand, whether to crop it, how to print it, and the countries that refuse one.
Photo Print Sizes in Pixels
Common photo print sizes in pixels at 300 DPI, which prints fit a phone photo, and the far smaller photos labs say they will print.
Reduce Image Size for a Website
Five photos measured: how much width, quality, format and DPI each take off a website image, and how many pixels wide to make it.
Schengen Visa Photo Requirements
No EU rule sets a Schengen visa photo size. What the Visa Code says, and what France, Germany and the Netherlands each ask for instead.
What DPI Means, and What It Does Not
DPI is a number in a photo's header that sets its print size. It adds no detail, browsers mostly ignore it, and a printer's DPI is something else.
Why an Online Form Rejects Your Photo
Forms reject a photo for its file or for your face. The file checks, the minimum size people miss, and how to tell which one failed.
JPG vs PNG vs WebP vs AVIF, Measured
Seven images saved as JPEG, PNG, WebP and AVIF in one browser tool: the file sizes, how close each stayed to the original, and which to pick.
Passport Photo Background Colour
The background colour each passport and visa photo rule asks for, quoted from the authority: white, off-white, light, or anything but white.
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