Online Dictionaries and other resources to look up words, phrases, acronyms, synonyms, etc., are necessary for every translator. And also for every kind of writer. There are some posts on this website about dictionaries you can download as desktop apps (e.g., GoldenDict, LingoPad, and QuicDic). But why did we so far not add any online dictionaries to provide you with the needed resources? The simple answer is that there are too many of them. If you are a translator or writer, you probably already have your favorite online dictionary.

Below I will give you some of the resources I consider helpful. Since I’m German, they will be related to my language pair (English <> German). However, most of those resources also provide services for other language pairs. And if you have dictionaries or other resources you consider to be of utmost importance, just let me know, and I might add them to the list below. Update: I also added some resources used by my friends and colleagues.

Table of dictionaries and other resources

Website Comments
Linguee Many languages to choose from, some languages only allow one pairing (e.g. there is only one pairing possible for Japanese, which is English <> Japanese), Linguee provides many contextual translations from internet sources, Linguee is a service of DeepL, a deep learning company, which also provides the DeepL Translator, a free machine translation system
LEO 10 language pairs, except of English <> Spanish all pairs have German as on part of the pair
Weblio a purely English <> Japanese dictionary and translation service, used by translators I know (had to mention this because I do not speak/read Japanese)
Glosbe a multilingual online dictionary supporting many language pairs, provides context as well
TheFreeDictionary multilingual dictionary, also provides thesaurus, acronyms, idioms, and more
bab.la online dictionary for 28 languages
Jisho Jisho is a powerful Japanese <> English dictionary. It allows you to find words, kanji, example sentences and much more quickly and easily.
DWDS only German <> German, with examples, definitions, and more
Macmillan English Dictionary the award-winning Macmillan English Dictionary was first published in 2002 in both British English and American English, the corpus contains millions of examples of English as used around the world
Duden the standard reference book for German spelling
Lexico.com Lexico.com is a new collaboration between Dictionary.com and Oxford University Press (OUP). Lexico is powered by Oxford’s free English and Spanish dictionaries and features multi-language dictionary, thesaurus, and translation content.
The STANDS4 Network Online since 2001, STANDS4 LLC is a leading provider of free online reference & educational resources, including Grammar, Abbreviations, Definitions, Phrases, Synonyms, and more

By the way, you can, of course, also use DeepL Translator, Google Translate, or other similar services as dictionaries. They usually already provide a bunch of good information.