Random Lexicon
Dictionaries
Random words and definitions using optional filters
No keyCORSHTTPS
Free Dictionaries APIs
Free public APIs for dictionaries, each one verified and kept up to date.
16 listed · 7 need no key · 4 work in the browser
Chinese Character Web
Dictionaries
This API is designed to help developers manage and respond to 404 errors on their websites. It provides insights into potential causes and offers solutions for correcting broken links and missing files to improve user experience.
No key
Chinese Text Project
Dictionaries
The CTP API provides integration methods for connecting the functionality and content of the Chinese Text Project with external web applications. It consists of a Plugin API for adding external tools and a JSON API for leveraging CTP features externally.
No keyHTTPS
Free Dictionary
Dictionaries
This API allows users to access word definitions, phonetics, and usage examples by sending a request with a specific English word. It serves as a resource for developers building applications that require linguistic data, enhancing learning and communication tools.
No keyHTTPS
Indonesia Dictionary
Dictionaries
Indonesia dictionary many words
No keyHTTPS
Wiktionary
Dictionaries
Collaborative dictionary data
No keyHTTPS
WordSoHard
Dictionaries
Word definitions with Scrabble validity and tile score in one call, built for word games
No keyCORSHTTPS
Lingua Robot
Dictionaries
Word definitions, pronunciations, synonyms, antonyms and others
API keyCORSHTTPS
Synonyms
Dictionaries
Synonyms, thesaurus and antonyms information for any given word
API keyCORSHTTPS
Collins
Dictionaries
Bilingual Dictionary and Thesaurus Data
API keyHTTPS
Merriam-Webster
Dictionaries
Dictionary and Thesaurus Data
API keyHTTPS
OwlBot
Dictionaries
Definitions with example sentence and photo if available
API keyHTTPS
Oxford
Dictionaries
Dictionary Data
API keyHTTPS
SayItVid
Dictionaries
English video pronunciation search with timestamps, IPA phonetics and subtitle context
API keyHTTPS
Wordnik
Dictionaries
Dictionary Data
API keyHTTPS
Words
Dictionaries
Definitions and synonyms for more than 150,000 words
API keyHTTPS
All 16 Dictionaries APIs
Free Dictionaries APIs — common questions
Counts and timings below come from our own scheduled checks of this category.
How many free dictionaries APIs are there?
We track 16 in this category, of which 12 responded at our last check. 7 of them need no API key.
Which dictionaries APIs work without an API key?
7 of the 16 entries here need no credential. Filter this page by "no key" to see them, or browse the no-key collection for every keyless API across all categories.
Can I use these dictionaries APIs in a browser app?
2 entries in this category need no key and return CORS headers, which is the combination that lets you call them straight from client-side JavaScript. The rest need a server or a proxy in between.
Which is the fastest free dictionaries API?
Of the keyless options that responded at our last check, Free Dictionary was quickest at a median 1275 ms. Speed is only one factor — coverage and licensing usually matter more — but it is measured here rather than claimed.
How do you know these APIs still work?
We call every listing on a schedule and record the status code, response time and whether CORS headers came back. Those results drive the badges on this page. Across the whole catalogue, 361 of 3,005 entries were not responding at the last full run, which is the sort of thing an unchecked list never tells you.