"For today, I'm going to demonstrate something that's been on my mind in a while - doing summarizing of PDFs completely in the browser, with Chrome's on-device AI. Unlike the Prompt API, summarization has been released since Chrome 138, so most likely those of you on Chrome can run these demos without problem. (You can see more about the AI API statuses if you're curious.)"
"There's plenty of options for getting PDF text on the server-side, either via open source libraries or APIs. For this demo I made use of PDF.js. This is an open source library sponsored by Mozilla that's been around for a while. It supports parsing and rendering PDFs, but for my use-case, I just needed to parse it. The code for that part is actually really simple, once I used Google Gemini to help me with it."
Chrome's on-device AI supports PDF summarization (available since Chrome 138), enabling in-browser processing without server-side APIs. PDF.js can parse PDF files; include the CDN and set pdfjsLib.GlobalWorkerOptions.workerSrc for performance. Use a file input change event to read the uploaded file's arrayBuffer, load the PDF via pdfjsLib.getDocument(arrayBuffer).promise, and iterate pages to extract textContent. Each text content item's 'str' contains raw string data and 'hasEOL' can aid formatting. Server-side options exist via open-source libraries or APIs, but on-device summarization uses Chrome's AI and can be combined with tools like Google Gemini for code assistance.
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