Sizes and file limits portals actually enforce
Application portals are strict about two things: dimensions and file size. The presets cover the common requirements — 35 × 45 mm, the standard for most passport offices across Europe, the UK, and India; the US 2 × 2 inch format; and square pixel sizes such as 600 × 600 px for the DS-160 visa form.
After you set the crop, the tool encodes the photo as a JPEG and compresses it until it fits the limit you enter. Those limits vary widely: the DS-160 accepts JPEGs up to 240 KB, while many Indian exam and government portals require photos between 20 and 50 KB and signatures between 10 and 30 KB. Hitting a 20 KB target by repeated trial and error in an image editor is tedious; here you type the number once.
What you still check yourself
This is a cropping and compression tool, not a compliance checker. It does not replace your background with white, and it does not verify biometric rules such as head height, eye position, or neutral expression. Read the official specification for your application, shoot against a plain and evenly lit wall, and frame the crop so your face meets the stated proportions.
Why an ID photo should stay on your machine
A passport photo is among the most sensitive images you own — it is your face, usually attached to an application carrying your name and identity documents. Every step here, from cropping to JPEG encoding, runs in a Web Worker on your own computer, so no copy of the photo exists anywhere else. The tool is free, requires no sign-up, imposes no usage quota, and adds no watermark to the result.