Free public APIs for dictionaries, each one verified and kept up to date.
15 listed · 5 need no key · 2 work in the browser
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.
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.
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.
Dictionaries
Indonesia dictionary many words
Dictionaries
Collaborative dictionary data
Dictionaries
Word definitions, pronunciations, synonyms, antonyms and others
Dictionaries
Synonyms, thesaurus and antonyms information for any given word
Dictionaries
Bilingual Dictionary and Thesaurus Data
Dictionaries
Dictionary and Thesaurus Data
Dictionaries
Definitions with example sentence and photo if available
Dictionaries
Dictionary Data
Dictionaries
English video pronunciation search with timestamps, IPA phonetics and subtitle context
Dictionaries
Dictionary Data
Dictionaries
Definitions and synonyms for more than 150,000 words
Dictionaries
Definitions and synonyms for more than 150,000 words
Counts and timings below come from our own scheduled checks of this category.
We track 15 in this category, of which 11 responded at our last check. 5 of them need no API key.
5 of the 15 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.
None of the entries in this category currently combine no-key access with CORS headers, so you will need a small server-side proxy to use them from browser JavaScript.
Of the keyless options that responded at our last check, Free Dictionary was quickest at a median 411 ms. Speed is only one factor — coverage and licensing usually matter more — but it is measured here rather than claimed.
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, 487 of 2,712 entries were not responding at the last full run, which is the sort of thing an unchecked list never tells you.