Cann Hall Primary, in Clacton-on-Sea, Essex, decided to obscure the students to protect them from being identified by paedophiles on the internet.
However, parents and child protection groups said it was political correctness gone mad.
The school said the aim was to protect pupils from being identified by But one parent said: "This is PC gone mad yet again."
The NSPCC said: "In this case the impulse to protect children's identity may have gone too far."
Head Clare Reece explained: "The public nature of the internet is an issue we feel strongly about. Not all parents want their children's picture on there. You can't say what will happen to those pictures."
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