Browser-based PDF form fields detection (YOLO-based)
Hey HN! Last week, Joe Barrow released CommonForms [1], a set of open models for automatically detecting form fields in PDFs. He trained two models, FFDNet-S and FFDNet-L, on a dataset of 55k documents. You can read more about his approach in the arXiv paper [2]. As someone who's been searching for reliable models to auto-detect form fields (one of the last hard problems in PDF form filling), I was seriously impressed by the quality of these models. I wanted to give them the attention and distribution they deserve, so I created a fully browser-based implementation that handles both detection…
In plain words
This browser-based tool automatically detects form fields in PDF documents using YOLO-based machine learning models trained on 55,000 documents. It runs entirely in the browser without requiring server-side processing, making it useful for developers and businesses that need to identify and extract form field locations from PDFs. The implementation combines two pre-trained models with post-processing to handle both detection and field addition tasks.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Hey HN! Last week, Joe Barrow released CommonForms [1], a set of open models for automatically detecting form fields in PDFs. He trained two models, FFDNet-S and FFDNet-L, on a dataset of 55k documents. You can read more about his approach in the arXiv paper [2]. As someone who's been searching for reliable models to auto-detect form fields (one of the last hard problems in PDF form filling), I was seriously impressed by the quality of these models. I wanted to give them the attention and distribution they deserve, so I created a fully browser-based implementation that handles both detection and field addition. My implementation relies on his models and onnx runtime web + some post-processing. I plan on publishing a small browser library to encapsulate it in the coming days to make it easier to deploy anywhere (currently you'd have to fork / copy my code) Happy to answer any questions about the browser-based implementation! Questions about the models themselves should be directed to Joe, who I believe is also on HN [3] [1] https://github.com/jbarrow/commonforms [2] https://arxiv.org/abs/2509.16506 [3] https://news.ycombinator.com/user?id=jbarrow
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