Dictionaries are an essential part of learning Romanian. These web-based dictionaries can be used for looking up words in either English or Romanian.
Bab.la was built by Andreas Schroeter and Patrick Uecker. They have dictionaries in 28 languages, also in Romanian. The website contains ads.
Glosbe is a project by some Polish people. In addition to a direct translation they also offer a translation memory that are example sentences in both Romanian and English.
Hallo.ro is a Romanian website with 1.2 million entries in their English - Romanian dictionary. It contains many ads.
The Romanian Wiktionary is part of the Wikipedia family of websites. Some entries contain information about etymology, the pronunciation and more. Also there is the translation of the word in many languages. Wiktionary is non-commercial and has an open source license. Thus it contains no ads.
Dict.com contains dictionaries in 34 languages, among them Romanian. It is operated by the Lingea company from Czechia.
Google Translate has translations between a big number of languages. But the quality of the translation is often not up to a high standard. So far there are no ads.
Bing Translator is Microsoft’s answer to Google Translate. It contains no ads and is of medium quality.
Dict.cc is set of crowd-sourced dictionaries where everbody can contribute. It is a project of Paul Hemetsberger from Vienna, Austria.