Summarize PDF Online
Generate a Markdown summary of any PDF on-device, with nothing uploaded.
How to Summarize a PDF with IronFreeTools
Upload PDF
Choose one PDF file from your device or drag and drop it into the upload area.
Summarize On-Device
Click Process Now to summarize the PDF locally with Chrome's built-in AI.
Download Markdown
Your summary is ready.
Download it as a Markdown (.md) file.
Go Beyond one-off PDF Summaries with IronPDF for C#/.NET
Summarize PDFs in your C# and .NET applications with IronPDF's AI extension, which connects your documents to Azure OpenAI for summaries and follow-up queries.
Need PDF summaries inside your own app? IronPDF's AI extension lets you summarize and query PDFs in C#/.NET with your own Azure OpenAI key.
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Frequently Asked Questions
Everything you need to know about summarizing PDFs on-device
What does Summarize PDF do?
Summarize PDF reads the text of a PDF in your browser and uses Chrome's built-in on-device AI to generate a Markdown summary. You can choose the summary type (key points, TL;DR, teaser, or headline) and length (short, medium, long).
Is my PDF uploaded anywhere?
No. Text extraction runs locally with pdf.js, and summarization runs on-device using Chrome's built-in Summarizer API. The PDF and its contents never leave your device.
Which browsers are supported?
This tool requires Chrome 138 or newer on desktop, with the built-in Summarizer API available and a supported device. If your browser does not expose the API, the tool will let you know.
Why does the first run take longer?
Chrome downloads its on-device AI model the first time the Summarizer API is used. Subsequent runs are fast and fully offline.
What output format do I get?
The summary downloads as a Markdown (.md) file. Markdown opens cleanly in any text editor and renders nicely in tools that support it, like GitHub, VS Code, or Obsidian.
Does this work on scanned PDFs?
No. This tool reads the embedded text layer. Scanned, image-only PDFs need OCR before they can be summarized.
What if my PDF is very long?
If a document exceeds the on-device model's input limit, the tool falls back to summarizing each page and then combining those summaries, so long PDFs still work.
Can I summarize password-protected PDFs?
Encrypted or password-protected PDFs need to be unlocked before they can be summarized.
Do I need an account?
No. Summarize PDF is free to use without sign-up, login, or installation.
Is this tool completely free?
Yes. You can summarize PDFs for free with no watermarks.
What are the key benefits?
On-device AI summarization Markdown output No uploads, no servers Choose type and length No account required Keep the original PDF unchanged.