For researchers & professionals
Read any foreign document the way you read your own.
Drop in a PDF — a research paper, a foreign contract, a technical manual — and we send back a sentence-aligned bilingual edition. Formatting preserved. Every sentence paired with its translation. AI explanations one tap away. The first 3,000 words a month are free.
vs. Google Translate
Paste a paper into Google Translate and your tables, footnotes, and paragraph breaks come back as a wall of text. Babelotheca keeps the structure — you read the translation next to the original page, not in a stripped-down chat box.
vs. DeepL
DeepL gives you a fluent translation, but no alignment and no export you can keep. Babelotheca returns an EPUB and a PDF where every source sentence sits beside its translation, ready to annotate, search, and read offline on a Kindle or tablet.
vs. a human translator
A 30-page paper costs €200+ and takes days. Babelotheca returns a polished bilingual edition in two to four minutes for the price of a coffee. Use it for triage, comprehension, and reference; bring in a human only for the documents that warrant it.
How it works
- Step 1
Upload
Drop a PDF or .txt onto the page and pick a target language.
- Step 2
Align
We translate sentence by sentence and pair each translation with its original — the same pipeline we use for the classic library.
- Step 3
Download
Get back an EPUB and a PDF with the two languages side by side. Read in the browser, on your Kindle, or on paper.
Built for the work you actually do
Academic papers
PhD candidates reading the German bibliography their advisor cited.
Legal & commercial
Foreign contracts, patents, and regulatory filings — the boring documents you can't afford to misread.
Technical manuals
Engineers working with Japanese or German hardware documentation.
Foreign news & analysis
Journalists and analysts reading the source-language reporting, not the wire summary.
Free for the first 3,000 words a month
Babelotheca subscription
Sentence explanations, EPUB exports, and translated word credits.
- ✓Full library of bilingual classics
- ✓EPUB & PDF exports
- ✓3,000 translated words / month for your own documents
- ✓500 AI sentence explanations / month
- ✓Offline reading on phone and tablet
- ✓50,000 translated words / month for your own documents
- ✓Everything in Basic
- ✓2,000 AI sentence explanations / month
- ✓300,000 translated words / month
- ✓Priority support
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Common questions
What file types can I upload?
PDFs and plain-text files today. Word documents, EPUBs, and HTML are on the roadmap — email us if you need one of these and we'll move it up.
Which languages are supported?
Spanish, French, Italian, Portuguese, German, Dutch, Russian, Japanese, Mandarin, Korean, Arabic, and Latin — paired with English in either direction. We add languages on request.
Does it preserve tables, figures, and footnotes?
Paragraph structure, headings, and footnotes survive the round trip. Complex tables and embedded figures are kept in place but not re-typeset; you get the original layout alongside the translated prose. Equations are passed through as-is.
Is my document private?
Yes. Your file is processed in our pipeline, the bilingual output is generated, and we don't share, sell, or train on your text. Files are deleted after the download link expires.
How long does a 30-page paper take?
Usually two to four minutes. You don't need to keep the page open — we email you when the bilingual edition is ready to download.
Why not just use ChatGPT or DeepL?
ChatGPT loses formatting and skips chunks on long documents. DeepL gives you a translation but no alignment — you can't compare paragraph by paragraph or keep a copy you can annotate. Babelotheca returns a real, structured bilingual edition you can read alongside the original.
Ready to read the document?
Translate a document — free