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Bilingual web page translation in Chrome

Use the LangBox desktop Chrome extension to place translations under each webpage paragraph, translate selections up to 5,000 characters, or double-click words.

Install LangBox for FreeLangBox runs in Chrome on a computer.Email me the linkView Reading Demo

Desktop Chrome extension · Guest trial credits without signing up

Credits and pricingPrivacyContact support

Supports original text preservation, paragraph translation, and dictionary lookup.
Side-by-side reading and lookup demoInteractive Illustration
es.wikisource.org / Proverbios y cantares, XXIX
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 text preservedAdjacent translationIn-page dictionary lookup

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.

Requirements and page limitations

  • Requires the LangBox extension in Chrome on a desktop computer; mobile browsers do not run the extension.
  • Works with the 2M-token one-time guest trial, the 10M-token 30-day signed-in allowance, or your own API key in the extension.
  • Complex or access-restricted pages may not parse completely; always check translations against the original paragraph.

Video · 20 seconds

Every web page, in two languages

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

Keep the original text Review original terminology and complete sentence structures while reading.

Append translations below paragraphs Refer to adjacent translations whenever you encounter complex sentences or unfamiliar phrasing.

Look up words while reading Check definitions in context and continue reading without opening a separate dictionary tab.

Spanish article with English translations below its paragraphs and LangBox controls.
A real screenshot of LangBox in use.

What you can do on a webpage

Translate the whole page, a passage, or one word

LangBox turns webpage translation into a few focused actions: translate the current page in Chrome, translate only a selected passage when needed, and look up a word beside the sentence.

01

Translate the current webpage

Choose “Translate current page” in the extension popup, or use the Translate button at the edge of the page. LangBox processes the page structure; dynamic, complex, or access-restricted pages may not be complete.

Whole-page translation
02

Append or replace the translation

Set Translation layout to Append to keep the original and place a translation below each paragraph. Choose Replace when you want the translated text in place of the original. The setting is saved in the extension.

Reading layout
03

Translate selected text

Select a word, sentence, or short passage and choose “Translate selected text” from Chrome’s context menu. A triple-click also reveals a translate button on the page. One selection can contain up to 5,000 characters.

Passage translation
04

Double-click to look up a word

Double-click a word to open the dictionary popover with the entry, part of speech, pronunciation, translations, and source. Play audio when an audio pronunciation is available, then press Esc or click away to close.

Reading dictionary
05

Remember a site preference

Turn on “Always translate this website” in the popup to activate translation automatically for that domain on future visits. You can also hide the floating control or manage the site list in Settings.

Site preference

Use Cases

What should you translate with the original kept in view?

A translate extension that keeps the original is for readers who want help with the hard sentences while still engaging with the foreign-language text.

01

Foreign technical documentation

Keep original technical terms visible while referencing translations for complex explanations in developer docs, guides, and technical blogs.

Docs · Tutorials · Dev blogs
02

Foreign-language news and articles

Read news, essays, or long-form posts on the web. Check translations and look up unfamiliar vocabulary directly on the page.

News · Blogs · General reading
03

Continuing study from web reading

When Personalized learning recommendations is enabled, eligible translations using LangBox managed models with remaining credits can feed into follow-up study.

Reading · Comprehension · Follow-up study

Getting Started

How to translate a web page in Chrome with LangBox

After installing the extension, open any supported foreign-language webpage and follow these steps.

View English learning guide

Technical Documentation Reading Guide

  1. 01

    Install LangBox and open a webpage

    Install LangBox in desktop Chrome, then open a foreign-language webpage and confirm the learning and target language settings. Page translation runs in desktop Chrome.

  2. 02

    Start from the popup

    Open the LangBox extension popup and choose “Translate current page”. You can also use the Translate button at the edge of the page to start or stop the current translation.

  3. 03

    Choose the display layout

    Set Translation layout to Append to keep the original and place translations below paragraphs, or choose Replace to show translated text in its place.

  4. 04

    Handle a smaller piece

    Double-click a word to open the dictionary. To translate one sentence or short passage, select it and choose “Translate selected text” from Chrome’s context menu.

  5. 05

    Keep a site ready for next time

    Turn on “Always translate this website” for a site you read often. Future visits to the same domain reuse the preference, which you can remove in Settings.

Credits & Plans

Credit options and access methods

Both guests and signed-in users can access LangBox managed models, or you can configure your own API key.

Guest trial

Start without an account

Use a one-time trial of 2,000,000 tokens right after installation without manual login or an API key.

One-time trial credits Credits do not renew automatically. Once exhausted, switch to another supported access method. Remaining balances and validity are displayed in the product.
Signed-in account

Sign in for periodic free credits

Sign in to receive periodic free credits and use cross-device sync.

Distributed periodically Available balances, eligibility conditions, and validity periods are displayed in the product.
Bring your own API key

Connect your own model provider

Connect your chosen model provider without consuming LangBox managed credits.

Billed according to provider terms Keys are stored locally and requests go directly to your selected provider, subject to their pricing and rate limits.

FAQ

Frequently Asked Questions

View all FAQs
Can every webpage be translated?

Page structure affects output quality. Highly dynamic, complex, or restricted pages may not parse completely. AI translations may also contain inaccuracies, so confirm critical details against the original text.

How is this different from Chrome's built-in page translation?

Chrome replaces the page with a translation. LangBox keeps the original paragraph and places the translation under it, so you can read both, double-click any word for a dictionary entry, and bring the words you looked up back for review.

Can I use it on mobile devices?

LangBox is a desktop Chrome extension. You can view this demo on mobile, but web page translation requires desktop Chrome.

Does testing this demo consume my credits?

No. This demo uses pre-written translations and definitions without calling live models. Actual extension output varies depending on the webpage, your settings, and the selected model.

How do I choose between side-by-side and replaced text?

In settings, set Translation layout to Append to keep original paragraphs alongside translations. Choosing Replace swaps the original text with the translation. This page illustrates the Append layout.

How do I translate a selected sentence or passage?

Select the text and choose “Translate selected text” from Chrome’s context menu. A triple-click on the webpage also reveals a translate button. One selection can contain up to 5,000 characters, which is intended for the part you need right now.

What does the dictionary show after a double-click?

The dictionary popover can show the entry, part of speech, pronunciation, translations, and source according to the page language and your settings. When audio is available, you can play the pronunciation. Switch dictionary language and retry if the automatic lookup finds no result.

Can a website be translated automatically on future visits?

Yes. Turn on “Always translate this website” in the extension popup. Future visits to that domain will use the saved preference. You can remove the domain or hide the floating Translate control from Settings.

What should I check if clicking translate produces no result?

Confirm that the page is accessible, a translation model is selected, and you still have an available access method or credit balance. Refreshing and trying again can help. Dynamic, complex, or restricted pages may still contain sections that cannot be processed.

Desktop Chrome Extension

Install LangBox
Translate web pages in Chrome with the original and the translation side by side

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