〜までもない・〜までもなく
no need to (it's obvious), it goes without saying
Verb dictionary form + までもない / までもなく
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までもない says something is so obvious or simple that there's no need to go as far as doing it: そんなことは言うまでもない, "that goes without saying".
までもなく continues the sentence: 確認するまでもなく、答えは明らかだ, "there's no need to check, the answer is obvious". 言うまでもなく, "needless to say", is a very common sentence opener.
The verb is usually one of saying, checking, going or asking. The logic is that the action would be overkill.
Compare ことはない (N3), "there's no need to (don't worry)", which reassures someone. までもない says the action is unnecessary because the answer is already clear.
Examples
そんなことは言うまでもない。
That goes without saying.
わざわざ行くまでもない。電話で済む。
There's no need to go all that way. A phone call will do.
確認するまでもなく、答えは明らかだ。
There's no need to check. The answer is obvious.
医者に診てもらうまでもない軽いけがだ。
It's a minor injury, not worth seeing a doctor about.
言うまでもなく、健康は何より大切だ。
Needless to say, health matters more than anything.