Jisho
A free Japanese-English dictionary you can search from English, romaji, or kanji.
BeginnerIntermediateFreeEasyDictionaryWeb
Japanese dictionary resources
A dictionary is a lookup layer. Beginners usually need a search box. Readers eventually need hover lookup.
Yomitan
A browser popup dictionary for looking up Japanese while you read.
IntermediateFreeInvolvedDictionaryWeb
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Do not collect dictionaries. Use one default and one upgrade.
Default search
Jisho is the first dictionary most English-speaking beginners should try. It accepts English, romaji, and pasted Japanese.
In-page lookup
Yomitan is the immersion-community default for hover definitions. It is free and setup-heavy. Add it when you are reading real pages, not while you are still learning kana.
Google Translate is a last resort, not a study method.