Can you summarize a PDF without uploading it?
Yes. Lyonesse summarizes a PDF entirely on your device, so the file never leaves your iPhone, iPad, or Mac. You import the document, pick a summary style, and an on-device model reads the text and returns a summary in seconds. There is no upload, no account, and no server ever sees the contents.
Most popular PDF summarizers work the other way around. You drag a file into a website or an app, it travels to that company's servers, a cloud model reads it there, and the summary comes back. That round trip is the problem for anything you would not email to a stranger. Lyonesse removes the round trip by doing the reading and the writing locally.
Why 'no upload' matters for sensitive documents
A contract, a medical letter, a bank statement, or an unreleased report carries information you are often not allowed to hand to a third party. The moment a file lands on someone else's server it is subject to their retention, their access controls, and their breaches. Summarizing on-device means the answer to 'who else can read this?' is nobody.
This is the difference that actually changes what you can use a tool for. On-device summaries are safe to run on client files, patient documents, and internal financials because the analysis happens in the same place the file already lives.
| Lyonesse | Typical cloud PDF tool | |
|---|---|---|
| Where the file is read | On your device | On the company's servers |
| Upload required | No | Yes |
| Account required | No | Usually |
| Works offline | Yes | No |
| Who can access the contents | Only you | The provider, and anyone with access to it |
How to summarize a PDF without uploading it
The flow is short. Open Lyonesse, import the PDF from Files or share it in from another app, choose a summary style, and read the result. Everything after the import runs locally, so you can do it in airplane mode. If you want, you can then ask follow-up questions about the same document without ever sending it anywhere.
What summary styles can you get?
One summary rarely fits every document. Lyonesse produces several on-device styles so you can match the output to the job:
- Concise, for a quick sense of what a document says.
- Bullets, for scanning the main points fast.
- Structured, when you want headings and sections that mirror the source.
- Detailed, for a longer walkthrough that keeps the nuance.
- Action items, to pull out what needs doing.
- Outline, when you are turning the document into notes or a plan.
All of these run on the on-device model, so switching styles costs nothing in privacy. You are not sending the file again each time you want a different view of it.
Can you ask questions about the PDF too?
Yes. After a document is imported, Ask Lyonesse lets you chat with it on-device, with multi-turn follow-ups and citations back to the source. You can ask what a clause means, pull a specific figure out of a report, or check whether a term appears, and the answer is drawn from the file sitting on your device, not from a server copy.
Because the whole library is searchable locally, you can also ask questions that span several documents at once, which is useful when a contract references an appendix or a report cites earlier numbers.
Which documents can you summarize?
Beyond PDFs, Lyonesse imports and reads Word, Excel, PowerPoint, plain text, and images. For images and scanned pages, on-device OCR pulls the text out first, and an optional on-device vision model can describe what the picture actually shows. That means a photographed page or a screenshot of a document can be summarized the same way a clean PDF can, without a trip to the cloud.
What about long documents?
Long files are where a private summarizer earns its keep, because they are also the ones you least want to hand over. The on-device model handles multi-page documents, and you can lean on the structured or outline styles to keep a long report readable. When you need one fact rather than a whole overview, the instant full-text search across everything you have imported is often faster than any summary.
The short version: summarizing a PDF and uploading it are two separate things, and only cloud tools have tied them together. Do the summarizing where the file already is, and the privacy question answers itself.
Related reading
Frequently Asked Questions
Do I have to upload the PDF to summarize it?
No. Lyonesse reads and summarizes the file on your device, so it is never uploaded. You can do it in airplane mode, and no server sees the contents.
Is it safe to summarize confidential documents?
Yes, because the analysis happens on your device. The file is not sent to a server, so contracts, medical letters, and financial documents stay private to you.
Can I summarize a PDF offline?
Yes. Once the document is imported, summarizing and asking questions run fully on-device, so no internet connection is required.
Can I get different kinds of summary?
Yes. You can choose concise, bullets, structured, detailed, action items, or outline, and switch between them freely since every style runs locally.
Does it work on scanned PDFs and images?
Yes. On-device OCR extracts the text from scans and images first, so they can be summarized like any other document without uploading.
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