QuickDef vs Google Dictionary Extension: Which Should You Use? (2026)
An honest comparison of QuickDef and the Google Dictionary Chrome extension: definitions, phrases, PDFs, translation, word history, and price. Which one fits how you read.
Short answer: use Google Dictionary if you want a free, unlimited, no-account dictionary that also translates words from other languages. Use QuickDef if you read in English as a second language and want each word or phrase explained in plain English, based on the sentence it appears in, or if you need lookups inside PDFs. Both are free to start, and many people keep both installed.
Google Dictionary (by Google) is one of the most-installed dictionary extensions in the Chrome Web Store, with about 3 million users. It is still available and was last updated in February 2026. QuickDef is a newer extension built around AI explanations. They both put a definition next to the word you double-click, but they answer different questions.
Side-by-Side Comparison
| Google Dictionary | QuickDef | |
|---|---|---|
| Double-click a word | Yes | Yes |
| Definition type | Dictionary entry | AI explanation based on the sentence, or a full dictionary entry |
| Explains phrases and idioms | Only if the phrase has its own dictionary entry | Yes, based on your sentence (drag across 2–7 words) |
| Plain-English level for learners | No | Yes (A2–B1 CEFR) |
| Translates words from other languages | Yes | No |
| Works on PDFs | Not in Chrome's built-in PDF viewer | Yes, in QuickDef's own PDF reader |
| Saves words | Optional word history, exportable as CSV | Saved words with the sentence you found them in |
| Account needed | No | No (anonymous sign-in supported) |
| Price | Free | Free (10 AI definitions/day, unlimited dictionary lookups, 25 saved words) / Premium $3.99/mo or $29.99/yr |
Checked October 2026.
Where Google Dictionary Is Better
It is completely free and unlimited. There is no daily cap and no paid plan. If you only need to confirm what a word means, it will never ask you for anything.
It handles other languages. Double-click a foreign word and Google Dictionary translates it into your chosen language. Its dictionaries cover more than a dozen languages, including Spanish, French, German, Japanese, Korean, Chinese, Arabic, Hindi, and Turkish. QuickDef explains English only.
It comes from Google. For some people, a well-known publisher is reason enough. It is small (about 50 KB) and doesn't need an account.
Limits to know:
- It shows the general dictionary entry, so for a word with many meanings you choose the right one yourself.
- You can select a phrase, but it only returns a result when that phrase has its own dictionary entry, and it can't read your sentence to pick the meaning. We explain why.
- Like most extensions, it doesn't run inside Chrome's built-in PDF viewer.
Where QuickDef Is Better
It explains the word in your sentence. QuickDef sends the surrounding sentence to the AI, so "bank" in a finance article and "bank" in a geography text get different answers. You get one short explanation instead of a list of meanings to scan.
It explains phrases. Drag across 2–7 words and click Define, and QuickDef explains the whole expression. This covers phrasal verbs, idioms, and fixed expressions, which are often the hardest part of reading in a second language.
It writes for learners. AI definitions use simple vocabulary (around CEFR A2–B1), so the explanation is easier than the word itself. If you want the classic entry, switch to dictionary mode for all meanings, phonetics, and audio where available.
It works on PDFs. Click Open PDF in the QuickDef toolbar popup and paste the PDF's link or choose a file. It opens in QuickDef's own PDF reader, where double-click lookups work the same way. More on looking up words in PDFs.
Saved words keep their context. Each saved word stores the sentence you found it in, which makes reviewing much easier than a bare list of words.
Limits to know:
- The free plan includes 10 AI definitions per day and 25 saved words. Dictionary-mode lookups are unlimited. Premium removes both limits.
- English only, and no translation into your native language.
- Chrome and Chromium browsers only, no mobile.
Same Word, Two Answers
Take this sentence from a news article:
"The minister said the new data would bear out the government's decision."
Double-click "bear" in Google Dictionary and you get the dictionary entry for bear: to carry, to support a weight, to endure, to give birth, and more. "Bear out" may not appear at all, and you still have to work out which meaning fits.
Drag across "bear out" in QuickDef and you get one explanation for this sentence, roughly: to show that something is true; here, the data will prove the decision was right.
If you are a fluent reader checking an unusual word, the dictionary entry is enough. If you are reading in your second language, the second answer saves you the guessing.
Which One Should You Install?
Choose Google Dictionary if you:
- Read comfortably in English and only look up rare words
- Read in other languages and want translations
- Want something free with no limits or account
Choose QuickDef if you:
- Read in English as a second language
- Get stuck on phrasal verbs, idioms, and words with many meanings
- Read PDFs such as research papers, reports, or ebooks
- Want to build a vocabulary list with real example sentences
Use both if you: read mostly in English but sometimes need a translation. They don't conflict when both are installed, but both react to a double-click, so you'll see two popups. Turning on Google Dictionary's option to require a key (such as Ctrl) with the double-click keeps them separate.
Frequently Asked Questions
Is the Google Dictionary Chrome extension still available?
Yes. As of October 2026, Google Dictionary (by Google) is available in the Chrome Web Store, has about 3 million users, and was last updated in February 2026. It is free.
Does Google Dictionary work on PDFs?
Not in Chrome's built-in PDF viewer, where most extensions can't run. QuickDef handles PDFs by opening them in its own PDF reader, where double-click lookups work normally.
Can Google Dictionary explain phrasal verbs and idioms?
Only partly. It shows dictionary entries, and some phrasal verbs have their own entry, but it can't explain a phrase based on your sentence. QuickDef lets you drag across 2–7 words to have the whole expression explained.
Is QuickDef free?
Yes, QuickDef has a free plan with 10 AI definitions per day, unlimited dictionary lookups, and 25 saved words. Premium costs $3.99/month or $29.99/year and removes the limits.
Can I use QuickDef and Google Dictionary at the same time?
Yes. Because both respond to a double-click, set Google Dictionary to require a modifier key (such as Ctrl) in its options, so each one opens only when you want it.
Features and pricing checked October 2026. Extensions change often; check each Chrome Web Store listing for the latest details.
Try QuickDef free — double-click any word for an instant definition.
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