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


Feel stuck reading real content in French or another language?

You understand the main idea.
But unknown words keep pulling you out of the text.
And you can’t tell which words you actually know and which you don’t.

WordByWord helps you take control of your vocabulary — on any website.

Turn any page, YouTube video, or PDF into a visual vocabulary map.

🔦 SPOTLIGHT MODE – SEE YOUR VOCABULARY
Stop guessing your level.

• 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

Now you don’t just read a language.
You see exactly where you stand.

🌍 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

Your vocabulary stays consistent everywhere.

📺 YOUTUBE LEARNING
• Click any subtitle word to translate and save
• Auto-pause on hover
• Seamless subtitle sync
• Build vocabulary from real content

📄 PDF SUPPORT
• Translate words directly inside PDFs
• Perfect for books, textbooks, and research papers
• Works with local and online documents

🎯 VOCABULARY TRAINER
Control turns into real progress.

• Smart spaced repetition
• Multiple training modes
• Custom collections
• Track your knowledge level
• Sync with wordbyword.io

🌎 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
✓ Stay consistent across all content
✓ Learn from the web — not just inside an app

Install → Activate Spotlight → Take control.

Learn the language — Word by Word.