〜にすぎない
merely, no more than
Noun / Plain form + にすぎない
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にすぎない plays something down: "it's only this, nothing more". これは私の意見にすぎない, "this is merely my opinion". すぎる means "to exceed", so it's literally "doesn't go beyond".
It's common with numbers, to stress how small they are: 参加者は十人にすぎなかった, "there were only ten participants". And for modesty: 私は自分の仕事をしたにすぎません, "I was only doing my job".
It's a formal, written equivalent of だけだ. It's often written に過ぎない.
Its opposite in feeling is にほかならない, "nothing other than", which asserts something strongly rather than playing it down.
Examples
これは私の意見にすぎない。
This is merely my opinion.
彼はただの学生にすぎない。
He's just a student, nothing more.
参加者は十人にすぎなかった。
There were only ten participants.
それはうわさにすぎない。
That's nothing but a rumour.
私は自分の仕事をしたにすぎません。
I was only doing my job.