10 Free AI Tools for Translating and Summarizing Documents in 2026

A long PDF in a language you do not read, a 60-page report due in an hour, a contract you need to understand before you sign: these are exactly the jobs AI does well. Translation tools convert the text, and summarizers pull out the points you need.

But free tools come with strings. Some translate one file a month. Some cap how many documents you can ask questions about. And some send your file to servers you know nothing about. This guide compares ten free tools by what their free plans allow, and it ends with a privacy checklist you should read before uploading anything sensitive.

Limits change often and several pages do not show a date, so confirm the numbers in the app before you plan around them.

Translating vs. Summarizing: Pick the Right Kind of Tool

• Translators convert text from one language to another and, in some tools, keep the layout of a Word, PowerPoint, or PDF file.
• Summarizers and PDF chat tools read a document and answer questions about it or condense it.
• General AI assistants can do both: upload a file, ask for a translation, then ask for a summary.

For important documents, a good approach is to translate first, then summarize the translation, and then spot-check key passages against the original.

How We Picked These Tools

We read each vendor’s own help or pricing page where it loaded. For ChatPDF, only a third-party directory loaded, so we mark that clearly. We left out tools whose pages gave no usable limits.

Translation Tools

1. DeepL

DeepL is widely used for natural-sounding translation. Its free plan allows 50,000 characters of text translation per user per month and 1 file translation per month, with files up to 5 MB. The page links to translation of PDF, Word, PowerPoint, and Excel files, but does not say which formats the free plan covers.

Paid Pro pricing on the page I could read was in euros for Germany: Individual at €7.49 a month, billed annually. US prices were not shown.

Best for: polished translations of emails, articles, and short documents.

Watch out for: one file a month is very tight, so use text translation for most work and save the file translation for what matters.

2. Google Translate

Google Translate is free, supports a very wide range of languages, and works in a browser or an app. Google’s help pages describe translating text and websites. I could not confirm file types, size limits, or cost for document translation from the pages I opened, so test it with your own file.

Best for: quick translations in many languages and websites.

Watch out for: formatting can shift in translated documents, and accuracy varies by language pair. Read the output with care.

3. LibreTranslate

LibreTranslate is a free, open-source machine translation service licensed under AGPLv3. The site includes a “Translate Files” option, though its list of supported formats was blank. You can also run your own server, which keeps documents on your own machine. The hosted service’s prices and usage caps are not stated on the page.

Best for: people who care about privacy and can run software themselves.

Watch out for: self-hosting needs technical setup, and quality may trail commercial tools for some languages.

4. Microsoft Translator

Microsoft Translator is aimed at conversations. The page describes a free translation and transcription service across iOS, Android, Windows, and the web, plus real-time translated captions and offline language packs for travel. It does not mention document translation, and the page was last modified in 2021, so check current features.

Best for: live conversations and travel.

Watch out for: if you need file translation, test another tool on this list.

Summarizing and Document Chat Tools

5. NotebookLM

NotebookLM answers questions using only the sources you upload. Google’s help page lists the free Standard plan at 100 notebooks per user and 50 sources per notebook, with limits subject to change. The page did not state file types or sizes.

Best for: summarizing a set of related documents, such as a semester’s readings or a stack of reports.

Watch out for: it works from your sources, so it will not fill gaps with outside facts.

6. ChatGPT

ChatGPT can read an uploaded file and translate or summarize it. OpenAI’s file upload page says free users are limited to 3 file uploads per day and up to 5 files per project. Files can be up to 512 MB, with a cap of 2 million tokens per text document. Free users get text-based retrieval only, so images inside PDFs and presentations are discarded.

Best for: one-off translations and summaries, followed by questions.

Watch out for: charts, diagrams, and images in your file are ignored on the free plan.

7. Claude

Claude accepts PDF, DOCX, CSV, TXT, HTML, ODT, RTF, EPUB, JSON, and (with code execution on) XLSX files, according to its help page dated July 23, 2026. Chat uploads can be up to 500 MB per file with 20 files per chat, and PDFs up to 1,000 pages. Visual elements are analyzed only for PDFs of 100 pages or fewer. The page does not say whether free accounts can upload files, so check your plan.

Best for: long documents and detailed summaries.

Watch out for: free-account upload rules are not stated on that page.

8. Gemini

Gemini can summarize and translate documents within the Google ecosystem. Google’s help page lists free usage as “Standard limits,” refreshing every five hours until a weekly limit applies, without giving file-specific numbers.

Best for: people who already work in Google Docs and Drive.

Watch out for: unpublished limits can change without notice.

9. ChatPDF

ChatPDF lets you upload a PDF and ask questions about it. The official page did not load for me. A third-party directory, last verified in March 2026, lists the free plan as 2 PDFs a day, up to 120 pages and 10 MB each, with 50 questions a day and no account required. It lists the Plus plan at $5 a month. Confirm these on the official site.

Best for: quick questions about a single PDF.

Watch out for: the limits come from a third party, and a free service that needs no account deserves extra privacy caution.

10. Smallpdf

Smallpdf bundles PDF tools with AI features: Chat with PDF, AI PDF Summarizer, Translate PDF, and an AI Question Generator, all marked “Limited” on the free plan. The page lists a 50 MB size limit and 25,000 to 35,000 words per document for the AI tools, and gives no daily task number. The Pro price was not visible.

Best for: people who also need to merge, compress, or convert PDFs.

Watch out for: the daily limits are unstated, so test with a real file.

Comparison at a Glance

Which Tool for Which Job

Matching the tool to the task saves you from hitting a limit halfway through.

• A short email or article in another language: DeepL or Google Translate, using text translation rather than file upload.
• One long PDF you need to understand fast: Claude or ChatGPT, then ask follow-up questions about specific sections.
• A pile of related documents: NotebookLM, because it keeps up to 50 sources in one notebook and answers from them.
• A single PDF with a quick question: ChatPDF or Smallpdf, as long as the file is not confidential.
• A sensitive file you cannot upload anywhere: a self-hosted LibreTranslate server for translation, and your employer’s approved tools for summaries.

A Simple Two-Step Workflow

This routine works for most documents and keeps errors low:

1. Translate in sections. Paste or upload a few pages at a time. Smaller pieces fit inside free limits and are easier to check.
2. Summarize the translated text. Ask for key points, dates, amounts, and deadlines, and tell the tool to flag anything it is unsure about.
3. Spot-check against the original. Pick three or four facts from the summary and find them in the source document. If any are wrong, treat the whole summary with suspicion.

A Privacy Checklist Before You Upload

Documents often contain names, financial details, health information, or confidential business data. Before you upload:

1. Read the privacy policy. Look for whether your files are stored, for how long, and whether they train models.
2. Remove sensitive details. Black out names, ID numbers, and account numbers when you can.
3. Prefer local options for secrets. For highly sensitive files, a self-hosted tool such as LibreTranslate keeps data on your own machine.
4. Check workplace rules. Your employer may forbid uploading company documents to public AI tools.
5. Avoid no-account services for confidential files. If you do not know who runs a service, do not give it sensitive documents.
6. Delete uploads when you can. Remove files from chat history and project libraries after you finish.

How to Get Better Results

• Tell the tool the language and purpose. “Translate to formal English for a legal reader” works better than “translate.”
• Ask for structured summaries. Request key points, deadlines, numbers, and open questions.
• Check numbers and names. Compare them against the original.
• Work in sections. Long documents summarize better in chunks.
• Ask for what is missing. “What does this document not say?” catches gaps.

Common Mistakes to Avoid

Trusting machine translation for legal or medical documents. Use a qualified human translator when stakes are high.

Assuming a summary is complete. Summaries drop details. Skim the original for sections that matter.

Ignoring file limits. A document that exceeds a tool’s limit may be cut off without a clear warning.

Using free tools for confidential files. Check the privacy policy first.

Not verifying quotes. Confirm any quotation against the source before you use it.

Frequently Asked Questions

What is the best free tool to translate a document? DeepL gives the most natural results, but its free plan allows one file a month. Google Translate and LibreTranslate are alternatives, and an AI assistant can translate an uploaded file within its limits.

What is the best free tool to summarize a PDF? NotebookLM, ChatGPT, Claude, and ChatPDF all work, with different limits. Pick based on file size and how many documents you have.

Are these tools safe for confidential documents? Not by default. Read each privacy policy, remove sensitive details, or use a self-hosted option.

Can AI replace a professional translator? For understanding the gist, often yes. For contracts, official records, and medical documents, use a professional.

Do free plans keep the original formatting? It varies. Test with a sample page before you translate a long file.

The Bottom Line

For most people, a simple stack works: DeepL or Google Translate for translation, and NotebookLM, ChatGPT, or Claude for summaries. Test each tool on a short sample, watch the file limits, and protect sensitive documents before you upload. For students, our guides to free AI note-taking and study apps and free AI tools for students pair well with this one, and our language learner guide covers practicing the languages you translate.

Sources

• DeepL Pro and free plan
• Google NotebookLM help
• OpenAI: file uploads FAQ
• Claude Help: uploading files
• Smallpdf pricing
• LibreTranslate
• Microsoft Translator
• AI Tools Atlas: ChatPDF pricing (third-party directory)