Altto
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AIFree · No sign-up · AI runs on your device

Translate a document.

Translate a PDF, Word document or pasted text into 27 languages, including Welsh, and download it as a Word file. The translating happens in your browser, so your document stays with you.

Document never leaves your device 27 languages Download as Word No account needed
or paste text
 
Needs a reasonably modern computer — check your device.
Your document is never uploaded to us. It’s translated right here in this browser tab. The first time you use a language pair, your browser downloads the translation model itself (or uses Chrome’s built-in translator) — your document is never part of that download.

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At a glance

Translate document: quick facts

Translate a PDF, Word document or text into 27 languages with AI on your device.

Updated

Price
Free. No sign-up, no watermark.
Input
PDF (typed or scanned), photo of a page, Word (.docx), .txt or pasted text.
Output
A Word document keeping headings and paragraphs.
AI model
Chrome’s or Edge’s built-in translator, or about 100 MB per language pair downloaded once.
Accuracy
Good for understanding and drafts; have official documents checked by a translator.
Privacy
Your document is translated in your browser and never uploaded. Only if your browser can’t do a language pair and you choose the server option is the text sent to Altto’s server, which doesn’t keep it.
How it works

How to translate a document

Add a PDF or Word file, or paste text, choose the language to translate into, and download the result as a Word document or a .txt file. The original language is detected for you.

  1. 01

    Add your document

    Choose a PDF or Word file, or paste text.

  2. 02

    Choose the languages

    We detect the original language for you — just pick the one you want.

  3. 03

    Download

    Save the translation as a Word document or plain text.

Tips

Tips for better translations

Machine translation is quick and useful, and a little care gets noticeably better results.

  • Plain sentences translate bestIf you’re translating your own writing, short sentences without idioms, such as “ballpark figure”, come out far more accurately than long, winding ones.
  • Check names, numbers and datesMachine translation can change names, units and date formats. Compare them with the original before you send or print a translation.
  • Set the language if detection missesAutomatic detection works best on a few sentences or more. For a short phrase, or text that mixes languages, set From to the right language yourself.
  • Have public text checkedFor a website, a menu or a notice, a quick read by someone who speaks the language catches wording that sounds odd, even when every word is technically right.

Like every Altto tool, this runs on your device — nothing you add is uploaded. How Altto works

27

languages to translate into, including Welsh, Arabic, Chinese (Simplified) and Hindi, all translated on your own device.

Before you start

Will it run on my device?

Because the AI runs on your own device instead of on a server, your computer does the work — that’s what keeps your files private. Most computers from the last few years are fine, but a more powerful one is noticeably faster.

Your device:Checking…

Minimum

  • ComputerAny laptop or desktop from about the last 6 years
  • Memory (RAM)4 GB
  • BrowserThe latest Chrome, Edge, Firefox or Safari
  • DownloadAbout 100 MB for each language pair, the first time

Long documents are translated paragraph by paragraph, so they can take a few minutes.

Recommended Fastest

  • ComputerA recent laptop or desktop
  • Memory (RAM)8 GB or more
  • BrowserChrome or Edge on a computer
  • BonusChrome and Edge have a built-in translator that is faster and covers more languages

Works on recent phones and tablets for shorter documents.

Tested on a mid-range PC with AMD Ryzen built-in graphics (no separate graphics card), in Chrome: A three-paragraph report translated into French in a few seconds with Chrome’s built-in translator.

FAQ

Frequently asked questions

Will it work on my computer or phone?
Most computers from the last few years run it fine. Because the AI runs on your own device, a more powerful computer is faster. See minimum and recommended specs, including a quick check of your device.
Is my document uploaded?
No. The text is read and translated inside this browser tab and is never sent to Altto or to a translation company.
Which languages can it translate?
English, Arabic, Chinese (Simplified), Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Romanian, Russian, Spanish, Swedish, Turkish, Ukrainian, Vietnamese and Welsh. Some pairs are translated through English, which can make them a little less natural. In browsers without a built-in translator (such as Safari and Firefox), the few pairs with no on-device model (such as English into Polish or Greek) can be translated on Altto’s server instead, if you choose; the text isn’t kept.
What gets downloaded?
Only the translation model. In recent desktop Chrome or Edge we use the browser’s built-in translator. Elsewhere your browser downloads a model of roughly 100 MB for each language pair the first time, then keeps it.
Does it keep my formatting?
It keeps headings and paragraphs. Tables, images and page layout aren’t carried over — you get a clean Word document with the translated text.
Does it work with scanned PDFs?
Yes. If the PDF is a scan, or you add a photo of a page (JPG, PNG or WebP), the words are read on your device first and then translated. The first time, your browser downloads the reading data for that language (Arabic is about 2 MB). Up to 30 scanned pages at a time.
Is it good enough for official documents?
Machine translation is great for understanding a document or a first draft, but for legal, medical or official use have it checked by a qualified translator.
How long can the document be?
There’s no word limit. Long documents simply take longer, because every sentence is translated on your own device, so a report of many pages goes more slowly on an older computer or a phone than on a recent desktop.
Can I translate just a paragraph or an email?
Yes. Paste the text into the box instead of adding a file, choose the language and copy the result. It’s the quickest way to translate an email, a message or a short note.
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