Filling PDF forms with AI using client-side tool calling
Hey HN! I built SimplePDF Copilot: an AI assistant that can interact with the PDF editor. It fills fields, answers questions, focuses on a specific field, adds fields, deletes pages, and so on. It's built on top of SimplePDF that I started 7 years ago, pioneering privacy-respecting client-side pdf editing, now used monthly by 200k+ people. As for the privacy model: the PDF itself never leaves the browser. Parsing, rendering, and field detection all run client-side. The text the model needs (and your messages) goes to whatever LLM you point at. By default that's our demo proxy (DeepSeek V4…
Filling PDF forms with AI using client-side tool calling launched on May 2, 2026 with 60 votes, #709 of 20,538 launches that month and more than 95% of that year's launches.
In plain words
SimplePDF Copilot is an AI assistant that interacts with PDF documents to fill form fields, answer questions, add or delete fields, and perform other editing tasks. Built on the seven-year-old SimplePDF platform, it processes PDFs entirely in the browser for privacy, with only the necessary text sent to an AI model of the user's choice. Users can connect their own LLM provider or run models locally, or use the default DeepSeek option. Unlike basic PDF chat tools, Copilot actively modifies documents rather than just retrieving text.
written from the facts on this page · September 2026
From the sources
SimplePDF Copilot: AI that helps users fill PDF forms step by step.
Public demo. Your chat messages leave your device and are sent to the selected AI provider. Use sample datafrom copilot.simplepdf.com
In the maker’s words, at launch
Hey HN! I built SimplePDF Copilot: an AI assistant that can interact with the PDF editor. It fills fields, answers questions, focuses on a specific field, adds fields, deletes pages, and so on. It's built on top of SimplePDF that I started 7 years ago, pioneering privacy-respecting client-side pdf editing, now used…
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