{"slug": "listing-writer-a-270m-gemma-in-your-browser-that-writes-ebay-listings-that-sell", "title": "Listing Writer: a 270M Gemma in your browser that writes eBay listings that sell", "summary": "A developer built Listing Writer, a single-page web app that turns a short item description into a formatted eBay or Facebook Marketplace listing using a 270M-parameter Gemma 3 model running entirely in the browser via Transformers.js, with no server or API key. In a test with a Sony WH-1000XM4 headset, the app produced a 52-character title, description, item specifics and pricing guidance without inventing brand, model or price details. The developer notes the first prompt version merely paraphrased input and exceeded the 80-character title limit until a full format example was added.", "body_md": "**Listing Writer** is a single-page web app that turns a 30-second item description into a polished eBay / Facebook Marketplace listing. You add a photo, the brand, the condition, and any flaws — a 270M-parameter **Gemma 3** running **entirely in your browser** (Transformers.js, no server, no API key) writes you back:\n\nEach section has a copy button. Paste straight into eBay.\n\n**Live demo:** [https://qife422.github.io/listing-writer/](https://qife422.github.io/listing-writer/)\n\n**Code:** [https://github.com/qife422/listing-writer](https://github.com/qife422/listing-writer)\n\nResellers. I did a cross-border e-commerce internship this summer (AI solutions for product selection and listing SOPs), and I'm gearing up to sell secondhand goods on eBay and Facebook Marketplace myself. Listing writing is the most tedious, most skipped step in resale: bad titles bury your item in search, vague descriptions invite returns.\n\nA tool like this earns its keep two ways: it saves ~10 minutes per listing, and better titles measurably get more views. For a seller moving 20 items a week, that's an afternoon back — or the difference between listing and not listing.\n\n**My first user is me.** I fed the app the spec for a test item — a Sony WH-1000XM4 wireless headset, black, like new, light scratches on the earcup, with the original case and cable — and it wrote back, in one pass:\n\n**Title** (52 characters)\n\nSony WH-1000XM4 Wireless Headphones Black - Like New\n\n**Description**\n\nLike-new Sony WH-1000XM4 in black with light scratches on the earcup. Includes the original case and cable.\n\n**Item specifics**\n\nBrand: Sony, Model: WH-1000XM4, Color: Black, Condition: Like new\n\n**Pricing guidance**\n\nCheck 3 sold listings for this model in like-new condition and price slightly below their average for a faster sale.\n\nIt didn't invent a single brand, model number, or price, and hitting Rewrite gave the same four-section format instead of echoing my input back. (Honest footnote: the first prompt version just paraphrased what I typed and blew past the 80-char title limit, so I taught the prompt with a full format example and re-ran. The pipeline held; the prompt needed the lesson.)\n\nThree reasons, all economic:\n\n`onnx-community/gemma-3-270m-it-ONNX` via Transformers.js 4.2.0, fp32 (the fp16 WebGPU path overflows on this model — learned that the hard way in Week 1).", "url": "https://wpnews.pro/news/listing-writer-a-270m-gemma-in-your-browser-that-writes-ebay-listings-that-sell", "canonical_source": "https://dev.to/qife422/listing-writer-a-270m-gemma-in-your-browser-that-writes-ebay-listings-that-sell-3n08", "published_at": "2026-10-15 23:12:01+00:00", "updated_at": "2026-10-15 23:28:41.831001+00:00", "lang": "en", "topics": ["large-language-models", "ai-tools", "generative-ai", "ai-products"], "entities": ["Gemma 3", "Transformers.js", "eBay", "Facebook Marketplace", "Sony", "Sony WH-1000XM4", "GitHub"], "also_reported_by": [], "alternates": {"html": "https://wpnews.pro/news/listing-writer-a-270m-gemma-in-your-browser-that-writes-ebay-listings-that-sell", "markdown": "https://wpnews.pro/news/listing-writer-a-270m-gemma-in-your-browser-that-writes-ebay-listings-that-sell.md", "text": "https://wpnews.pro/news/listing-writer-a-270m-gemma-in-your-browser-that-writes-ebay-listings-that-sell.txt", "jsonld": "https://wpnews.pro/news/listing-writer-a-270m-gemma-in-your-browser-that-writes-ebay-listings-that-sell.jsonld"}}