Skip to content

Learn from what you read and watch

LangBox combines a desktop Chrome extension for web pages and YouTube, browser tools for PDFs, EPUBs, and podcasts, and a web learning app.

Add to Chrome — FreeLangBox runs in Chrome on a computer.Email me the linkTry a tool, no install

Free · No account needed to start · Your own API key optional

es.wikisource.org/wiki/Proverbios_y_cantares_(Campos_de_Castilla)
ES English

Antonio Machado · Campos de Castilla

Proverbios y cantares, XXIX

, son tus huellas el camino, y nada más; caminante, no hay camino: se hace camino al andar. […]

Paragraph translation

Traveller, your footprints are the road, and nothing more; traveller, there is no road: the road is made by walking. [Excerpt]

In this sentence
Caminante/kamiˈnante/noun

walker; a traveller on foot

caminante, no hay camino
Here the poet speaks to the reader as a traveller.

Shows the part of speech and meaning of the word in this sentence.

Click the highlighted word to see its definition, or switch reading modes above.

Original source: Antonio Machado, Campos de Castilla · Public domain
The original is in the public domain. The translation and definition were written for this demo. This is an interactive illustration, not an actual extension screenshot or live AI output.

Product tour · 47 seconds

See it all in under a minute

Translation under each paragraph, the double-click dictionary, YouTube dictation, PDF and EPUB, the online tools and the learning app. The sites and texts in the video are demo content.

Feature videos · 20 seconds each

Each feature in 20 seconds

Seven short videos. Pick one to watch it here.

  • Every web page, in two languages

    About this feature →

    A translation under each paragraph. The layout stays as it was.

  • Shadowing and dictation, on any YouTube video

    About this feature →

    Two subtitle lines, a transcript, then practise sentence by sentence.

  • Bilingual PDFs, side by side

    About this feature →

    The original on the left, its translation on the right, the layout kept.

  • Bilingual EPUBs for any book

    About this feature →

    Every paragraph followed by its translation, in a real EPUB file.

  • Podcasts, transcribed and ready to practise

    About this feature →

    Transcription, dictation, a bilingual transcript and shadowing.

  • Look up a word, keep it for later

    About this feature →

    Double-click any word. Save it with the sentence you found it in.

  • Online courses, with spaced review

    About this feature →

    IELTS, English A1–C2, Workplace English and Spanish.

Everything you read and watch becomes a lesson

See all 9 tools →
A Spanish article with English translations under each paragraph.
A Spanish research paper beside its English translation, two columns kept.
Schaub-Torre, Quirós and García-Mieres, Detección automática de patologías en notas clínicas en español (SEPLN 2024), CC BY 4.0. The English is a machine translation by LangBox.
Bilingual view: source text and translation, paragraph by paragraph.
A Spanish YouTube video with a bilingual transcript beside it.
Follow the transcript, identify speakers, and return to the audio from a timestamp. Bilingual reading is available when your native language differs from the audio.
Pronunciation, part of speech and the meaning in this sentence

Nothing to read yet? Start a course

Graded reading, listening and practice, with spaced review that brings each question back before you forget it.

Also in the app: podcasts with transcripts, dictation lessons from your own videos, and your PDF and EPUB library.

Explore courses and practice
A fill-in-the-blank practice question with a hint in the learner's language.

What LangBox is

Start with what you have

Choose an entry point. One account connects the extension, online tools and learning app.

In your browser

Chrome extension

Install the extension to read websites and watch YouTube with bilingual support.

  • Translation under each paragraph, on any site
  • Double-click dictionary with pronunciation
  • YouTube dual subtitles, transcript and dictation
  • PDF and EPUB beside their translation
  • arXiv and PubMed with formulas left intact
Add to Chrome — FreeLangBox runs in Chrome on a computer.Email me the link

On palingo.pro

Online tools

Open an online tool to translate a PDF, ebook, image or subtitle file.

  • PDF translator that keeps the layout
  • EPUB translator and ebook converter
  • Image translator and photo vocabulary sheets
  • Subtitle translator and YouTube subtitle downloader
  • Podcast transcription from a link or RSS
All tools

On app.palingo.pro

Learning app

Open the learning app for podcasts, your library and guided practice.

  • Courses: IELTS, English A1–C2, Workplace English, Spanish
  • Spaced review that schedules each question
  • Practice from fill-in-the-blank to IELTS writing feedback
  • YouTube videos and podcasts in the language you learn, as dictation lessons
  • Your PDF and EPUB library
See courses and practice

Free as a guest. More with a free account.

LangBox is free during the public preview. One Google sign-in covers the extension, the online tools and the learning app.

Guest, no account

Free

  • AI translation allowanceOne-time trial of 2,000,000 tokens
  • Extension: reading, dictionary, YouTube transcript and dictationYes
  • Your own OpenAI, Claude or Gemini keyYes, stored on your device
  • PDF translatorNeeds a free account
  • EPUB translatorWhole-book translation and download
  • Image translator1 image a day
  • Podcast transcription2 episodes a day, up to 60 minutes
  • Learning progressOn this browser
Try a tool, no install

Free account

Recommended

Free

  • AI translation allowance10,000,000 tokens every 30 days
  • Extension: reading, dictionary, YouTube transcript and dictationYes
  • Your own OpenAI, Claude or Gemini keyYes, stored on your device
  • PDF translatorUp to 100 MB, no page limit; files kept 24 hours
  • EPUB translatorThe whole book, bilingual EPUB download
  • Image translatorMore, with free credits for new accounts
  • Podcast transcriptionUp to 3 hours, most accurate model
  • Learning progressSynced across devices
Sign in with Google

Your own key is billed by its provider. Translations are model output and can be wrong; check anything that matters.

The next thing you read is the lesson.

Add to Chrome — FreeLangBox runs in Chrome on a computer.Email me the linkTry a tool, no install

Interface in English, 简体中文, 繁體中文, 日本語, 한국어, Español, Français and Tiếng Việt