A real 3×4 cm photo, not just the shape
A 3x4 photo is the small upright portrait, 3 centimeters wide by 4 centimeters tall, that shows up on school enrollment forms, membership and staff cards, résumés, exam registrations and many kinds of paperwork. It is especially common in Brazil and in other countries that use metric photo sizes.
This page does more than cut the picture to a 3:4 shape. It saves the photo with the pixels that 3×4 cm needs at 300 DPI, roughly 354 by 472 pixels, and writes the 300 DPI value into the JPG. A program or a print shop that reads that value prints the photo at 3×4 cm without you doing any math.
A sheet with several copies
One 3×4 photo is rarely enough, and printing a single tiny picture in the middle of a page wastes paper. So the tool also builds a sheet with the photo repeated and cut marks to guide the scissors or the paper cutter. Choose 10×15 cm, the standard small photo print, as a JPG or a PDF, or a full A4 or Letter page as a PDF.
The 10×15 cm JPG is handy for photo kiosks and print counters, which take image files and print on photo paper. Use the A4 or Letter PDF on your own printer. Photo paper and the printer's best quality setting make a visible difference on a picture this small.
Print it at 100%
The measurements are only right if the sheet is printed at actual size. In the print dialog, set the scale to 100% or “Actual size” and switch off “Fit to page” or “Shrink to fit”. At a kiosk, choose the option that prints the image without cropping or zooming it.
Before cutting, put a ruler on one copy: it should measure 3 cm across and 4 cm from top to bottom. If it is smaller or larger, the printer rescaled the page, and you only need to print again with the scaling turned off.
What it does not change
The tool crops, sizes and lays out the photo. It does not change or whiten the background, it does not retouch skin or lighting, and it does not check the requirements of any particular document, such as background color, how large the face must be or whether glasses are allowed. The office or organization that receives the photo decides that, so read their instructions first.
For a good result, start with a suitable picture: face the camera, stand in front of a plain wall, use even daylight without hard shadows, and leave space around your head so there is room to frame.
Private, free and on any device
The photo is processed in your browser. It is not uploaded and no copy is kept, which is how it should be for a picture of your face. It works on phones and computers with JPG, PNG, WEBP, GIF and BMP images, and with HEIC when your browser can open it, as Safari does on an iPhone. There is no sign-up, no watermark and no limit on use.