Comparison · August 2026

Best tools to translate scientific papers

The problem is rarely the language. It is the two-column PDF, with figures, captions and tables, that scrambles the moment you copy it.

Reviewed on August 11, 2026

How do you translate a scientific paper without breaking the layout?

It depends on whether the PDF has a text layer. If text is selectable, a document translator — DeepL or Google Translate — returns the whole file translated with much of the layout intact, and that is the fastest route. If the PDF is scanned, copy-protected, or has figures with embedded text, none of that works: there is no text to extract, and the route becomes screen-reading translation.

The stubborn case is not the body of the paper, it is the figure. Charts, maps and diagrams carry labels, axes and legends as pixels, which no document translator can reach. That is where on-screen translation wins: labels stay where they were, so the chart still reads as a chart.

For academic reading, the next step matters as much as the translation: reading the translated abstract and deciding in thirty seconds whether the paper is worth it. A tool that translates and summarizes in the same gesture shortens triage; a tool that only translates hands you back to another window.

The five routes

DeepL (document translation)

Web, Windows, macOS

Free with monthly limits · paid plans from about US$8.74/month billed annually

Best for: PDFs with selectable text, start to finish.
Where it wins: Translation quality in European languages is the market reference, better than the average option here. The Windows app also translates selected text with a double Ctrl+C.
Where it falls short: Document translation has a monthly quota on the free plan. It cannot reach text inside figures or scanned PDFs with no text layer.

Google Translate (document)

Web

Free

Best for: A quick draft of a whole PDF, with nothing to install.
Where it wins: Free, no account, and the widest language coverage on the market — including languages DeepL does not serve.
Where it falls short: Two-column layouts usually come back scrambled. It also cannot read text inside figures.

Sincron Screen Tools

Windows 10 and 11

Free with daily limits · Unlimited US$36/year or US$89 lifetime

Best for: Figures, charts, tables, and scanned or copy-protected PDFs.
Where it wins: It translates what is drawn as an image, keeping every label in its original position — and summarizes the passage in the same gesture, which shortens reading triage.
Where it falls short: It translates what is on screen, not the whole file at once. To convert a 40-page PDF start to finish, a document translator is the right tool.

PowerToys Text Extractor

Windows

Free · Microsoft

Best for: Pulling text out of a scanned PDF to paste elsewhere.
Where it wins: It solves blocked copying for free, and recognition runs on your machine without sending the document anywhere — which matters when the paper is confidential.
Where it falls short: It does not translate. And it depends on the Windows OCR pack for that language being installed.

Adobe Acrobat

Windows, macOS, web

Paid subscription

Best for: People who already pay for it and need OCR with good layout fidelity.
Where it wins: Its OCR rebuilds the text layer inside the PDF itself, so the file becomes permanently searchable — nothing else on this list does that.
Where it falls short: Expensive if the goal is just reading one paper. Translation is not what the tool is for.

Summary

Tool	PDF with text	Scanned PDF	Text in figures	Summarizes
DeepL	Yes	No	No	No
Google Translate	Yes	No	No	No
Sincron Screen Tools	Yes	Yes	Yes	Yes
PowerToys Text Extractor	Yes	Yes	Partial	No
Adobe Acrobat	Yes	Yes	No	No

Prices and features checked in August 2026. Third-party tools change without notice — confirm on the official page before deciding.

A practical route for a paper you just downloaded

Test whether the text is selectable
Try selecting a paragraph. If it selects, the PDF has a text layer and a document translator handles the body.
Translate the abstract first
Before converting the whole file, translate and summarize the abstract alone. Most papers get discarded at this step.
Handle figures separately
Charts, maps and diagrams never come through a document translator. Translate each figure on screen, with labels in their original positions.
Capture the citation before closing
Annotate over the passage that mattered and keep the screenshot with the note. That is what stops you reopening the PDF three weeks later hunting for it.

Frequently asked questions

Can I translate a copy-protected PDF?

Yes, by reading the screen. The protection blocks selecting and copying, but the text is still visible — and what is visible can be recognized and translated.

Is machine translation good enough to cite in a paper?

For triage and reading, yes. For literal quotation, no: always cite from the original and have the translated passage checked by someone fluent. Technical terminology is where machine translation fails most.

Is the document uploaded to a server?

In Sincron, the recognized passage goes to the translation service; the file itself never leaves your machine. In PowerToys, nothing leaves. With a document translator, the entire file is uploaded — worth considering when the paper is confidential or unpublished.

Does it work with mathematical formulas?

Poorly, in every option. A formula rendered as an image confuses any OCR. The surrounding prose translates well; read the formula itself in the original.

Keep reading

See it in practice

The scientific papers page demonstrates the figure-with-labels case — the one document translators cannot reach.

See the demo