By the end of this guide you will have taken a document in one language and produced a translated copy in another, checked for mistakes and saved in a format you can send. The job is done by an AI translation tool: you upload the file, choose the languages, and the tool returns a translated version, ideally with the original layout intact.
If you want to translate a document with AI, the main choice is how much human checking sits behind the machine. Some tools are free and instant, some add glossaries and revision logs, and some route weaker output to professional editors. This guide walks through each route and compares six tools from our Writing category.
Key takeaways
- Upload the original file, pick the source and target languages, add a glossary if you have one, then read the result against the original before you share it.
- The main decision is how much risk the document carries: a free tool such as Google Translate suits everyday reading, while contracts, regulatory papers and medical text call for human review or certification.
- Check what the vendor does with your upload. X-doc AI lists in its terms that it may use source and processed text to train its translation tool.
- Machine translation is a draft. A person who reads both languages should check anything legal, medical, financial or academic.
What you need before you start
- The original file. Word, Excel, PowerPoint, PDF or plain text are the formats these tools list. An editable original gives a better result than a re-saved copy.
- Source and target languages. Know exactly which language variants you need, because tools differ in coverage.
- A glossary. A short list of product names, legal terms and phrases that must not change.
- An account or a developer. Several of these services are set up through an account or a sales conversation, and the API options need someone comfortable with code.
- Time. A first translation and a read-through fit in under an hour for a short document. Long or technical files take longer.
- Difficulty. Easy for the web tools, moderate for the API tools.
- Permission. If the document is confidential or belongs to a client, confirm you may upload it to a third-party service.
Which kind of AI tool fits this job
Pick by how much the document matters and how it will be used.
A free tool for everyday documents. Google Translate is a free website and Android and iOS app. Its listing says uploaded documents are translated while keeping their layout, and it can also translate a web page from a URL. It works on web, Android and iOS, and also offers a paid API for developers. Its listing says language coverage differs by mode, so confirm your pair is supported for the way you plan to translate.
A document platform for technical and regulated files. X-doc AI translates Word, Excel, PPT, PDF, XML and text files into 100+ languages while preserving layout, tables and charts. It lists curated glossaries, change tracking and revision logs, optional human typesetting within 24 hours and human-certified translation for official documents.
An API for developers and pipelines. The DeepL API translates text and documents, including PDF, Word, PowerPoint and HTML with the original layout kept, in more than 100 languages. It supports glossaries and style rules. It is a separate product from the DeepL Pro apps.
A service with human review levels. Tolq combines machine translation with professional linguists and lets you choose a quality level per request, from machine output to expert translation for legal, technical or medical content. Unbabel scores each machine translation and can pass weaker output to human editors. It accepts files such as docx, json, pptx and srt.
An enterprise localization platform. LILT is aimed at companies that localize content at scale, with connectors, plus API access and managed expert verification on its Enterprise tier. It is quoted through sales rather than sold self-serve.
Step 1: Prepare the source document
A clean source gives the translation tool less to get wrong.
- Open the original and fix typos, because errors in the source are translated faithfully.
- Remove anything that should not leave your hands, such as personal data, internal comments or tracked changes.
- Keep the file in an editable format. If you have the Word or PowerPoint original, use that rather than a PDF export.
- Write down the target languages and any regional variant you need.
Check it worked by opening the file once more and confirming the text is selectable and the formatting looks normal.
Step 2: Choose a tool to translate your document with AI
You finish this step with one tool picked for this specific job.
- Rank the document by risk. A newsletter draft is low risk. A clinical protocol, a contract or a compliance filing is high risk.
- For low risk, try Google Translate first, since it costs nothing to use.
- For technical or regulated content, look at tools that list glossaries, revision logs or human certification, such as X-doc AI.
- If you are building translation into your own software, look at the DeepL API. Its Developer plan is free for up to 1,000,000 characters in total and does not reset.
- Read the data terms before you upload. X-doc AI's terms let it use source and processed text to train its translation tool, so check that this is acceptable for your file.
Check it worked by writing one sentence on why this tool suits this document.
Step 3: Upload the file and set the languages
The goal is a first translated copy with the right language pair.
- Sign in, or open the web tool, and choose to translate a document or file.
- Upload your file. Confirm the format is supported: X-doc AI lists Word, Excel, PPT, PDF, XML and text, and DeepL API lists PDF, Word, PowerPoint and HTML among others.
- Select the source language, or let the tool detect it if it offers that, then select the target language.
- Attach your glossary if the tool supports one. Unbabel, X-doc AI and the DeepL API list glossary or terminology features, and Tolq lists glossary checks on its human quality levels.
- Start the translation and wait for the result.
Check it worked by seeing a translated file listed with the right target language.
Step 4: Review the layout and the wording
Machine output looks fluent even when it is wrong, so read it with care.
- Open the translated file next to the original.
- Look at layout first: tables, charts, headings, page breaks and columns. Translated text is often longer or shorter and can push things out of place.
- Check numbers, dates, units, names and product terms against the original.
- Read one full section aloud, or hand it to someone fluent in the target language.
- Note anything that reads oddly and fix it in the translated file.
Check it worked by finding no mismatched numbers or names in a spot-check of three pages.
Step 5: Add human review where it matters
Some documents need a person to take responsibility for the result.
- Decide whether this file needs review. Legal, medical, financial, academic and official documents do.
- Use a service with human levels. Tolq lists translation, localization and expert translation levels, and Unbabel offers machine, hybrid and premium pipelines. X-doc AI offers human-certified translation for official documents.
- Ask a fluent reviewer to approve or correct the final text.
- Send corrections back into your glossary so the next document starts from better terms. Tolq's translation memory reuses only 100% matching sentences, and sentences enter it only after you approve a finished request.
Check it worked by having a named reviewer confirm the final version.
Step 6: Export and store both versions
Finish by saving the result in the format your reader needs.
- Download the translated file in the same format as the original where possible.
- Save the original and the translation together with the date and the tool used.
- Keep a copy of your glossary and any approved sentences.
- Before you send the file, open it on the device or app the recipient will use.
Check it worked by opening the final file and confirming it matches the layout you reviewed.
Tools for this job compared
| Tool | Good fit for | Pricing | Stated limits |
|---|---|---|---|
| Google Translate | Free everyday translation of text, pages and documents (web, Android, iOS, API) | Free | Language coverage differs by mode; API use is paid and priced separately |
| X-doc AI | Word, Excel, PPT, PDF and XML files with layout kept (web, API) | Free trial | 7-day Advanced trial has a non-refundable $1.00 fee; unused balances expire; terms allow training use |
| DeepL API | Developers translating text and documents by API | Freemium | Developer plan: 1,000,000 characters in total, no reset; spreadsheet, slide and PDF files count at least 50,000 characters each |
| Tolq | Per-word translation with human quality levels (web, HubSpot) | Paid, from $0.05, usage-based (checked 24 Oct 2026) | Rates vary by language; translation memory reuses only 100% matches |
| Unbabel | Business translation with quality scoring and editors (web, API) | Paid | Every published tier needs a sales conversation; annual spend minimums apply |
| LILT | Enterprise localization with connectors and expert verification (web, API) | Contact sales | Quoted through sales; expert verification and API access are Enterprise features |
Prices and plan limits change, so confirm the current terms on each vendor's site before you subscribe.
Common mistakes to avoid
- Treating machine output as final. Fluent text can still mistranslate a term or flip a meaning. Fix it by reading the result against the original and using human review for anything high stakes.
- Skipping the glossary. Without one, a product name or legal term may be translated differently each time. Fix it by loading approved terms before you run the file, where the tool supports it.
- Ignoring where your file goes. Contracts and internal papers may be covered by confidentiality rules, and one vendor's terms allow training use of uploads. Fix it by reading the data terms first and choosing a tool whose terms fit.
- Forgetting layout. A translation can break tables and page flow even when the words are right. Fix it by checking tables, charts and headings, and by asking about typesetting help if the layout matters.
- Assuming one tool covers every language pair. Google Translate notes that coverage differs by mode. Fix it by confirming your pair before you commit.
How we put this together
This is an evidence-based guide built from each tool's listing in our directory, which is compiled from the vendor's own site and pricing page. It is not a review based on using the tools. We don't rank tools, and nobody paid to be included. Some outbound links may be affiliate links; see our disclosure.
Frequently asked questions
Is there a free way to translate a document with AI?
Yes. Google Translate is free to use on the web and in its Android and iOS apps, and its listing says uploaded documents keep their layout. X-doc AI lists a free plan, though its limits are not given in the listing. Developers can use the DeepL API Developer plan, which is free for up to 1,000,000 characters in total.
Can AI translate a document accurately?
It produces a useful draft, not a guaranteed accurate result. Quality depends on the language pair, the subject and the source text. Have a fluent person check anything legal, medical, financial or academic. For official records, X-doc AI lists human-certified translation as an option.
Which tool is good for translating on a phone?
Google Translate lists Android and iOS apps, plus offline translation once you download a language. Most of the other tools here list web or API access, so check each vendor's site before you rely on a phone workflow.
Can I keep my document private?
It depends on the tool. X-doc AI lists end-to-end encryption, but its terms also let it use source and processed text to train its translation tool. DeepL states that Pro customer data is never used to train its models. Read each vendor's data terms before uploading confidential files.
Compare more options in our Writing category.
