WordByWord – Vocabulary Builder & Translator

Highlight and translate unknown words while reading. Track your vocabulary progress on websites, YouTube & PDFs in 50+ languages.

Learning new words, forgetting them a few days later, and feeling stuck? WordByWord shows you the words you haven't learned yet, helps you understand them in real context, and builds your vocabulary naturally as you read. 🔦 SPOTLIGHT MODE – SEE YOUR VOCABULARY Stop wondering which words deserve your attention.
Spotlight instantly reveals the words you haven't learned yet while hiding the ones you already know. • Instantly highlight unknown words on any webpage • Color-coded by learning status (new → learning → known) • See how much of the page you truly understand • Update word status directly on the page • Watch your vocabulary grow over time 🌍 LEARN WHERE YOU ACTUALLY READ Unlike apps that lock you into their content, WordByWord works wherever you read: • Websites & online articles • YouTube subtitles • PDFs (local & online files) • Blogs, news, research papers 📺 YOUTUBE LEARNING • Turn every video into a language lesson • Click any subtitle word to translate and save • Auto-pause on hover • Navigate by subtitles, not seconds 📄 PDF SUPPORT • Translate words directly inside PDFs • Perfect for books, textbooks, and research papers • Works with local and online documents 🎯 VOCABULARY TRAINER • Multiple training modes • Smart spaced repetition • Train only the words you need • Review with Flashcards • Import & export your vocabulary (CSV, PDF) • See how well you know each word 🌎 50+ LANGUAGES French, Spanish, German, Japanese, Korean, Italian, Portuguese, Chinese, Arabic, Russian and many more. 🚀 WHY WORDBYWORD? Unlike basic translators, WordByWord helps you: ✓ See which words you know and which you don’t ✓ Build your vocabulary faster with real content ✓ Track your progress visually ✓ Focus only on words you still need to learn ✓ Keep learning wherever you read Install → Activate Spotlight → Grow Your Vocabulary