Sell Your Stuff Online with ChatGPT

What does this setup do?

You upload photos of things you want to sell, ChatGPT or Claude drafts a title, an honest description, and a suggested price range based on similar listings it finds with web search, and you post each listing yourself on Facebook Marketplace, eBay, or a local site.

Who is it for?

For anyone with a closet, garage, or basement full of things they keep meaning to sell, but who stalls on writing listings and guessing prices.

How do you set it up?

Tools

• ChatGPT Free or Claude Free. Both include photo uploads and web search, and ChatGPT Free limits uploads.
• 2 to 4 clear photos per item, including any brand label, model number, or damage
• An account on the site where you want to sell

Steps

1. Photograph each item in good light from a few angles. Include the brand label or model number and any scratches or wear.
2. Upload the photos with the prompt below. Do 3 to 5 items per chat so details don't get mixed up.
3. Check what the chat identified. Fix any wrong brand, model, or size before you use the listing.
4. Look at the price range and the similar listings it links. Sold prices tell you more than asking prices, so check sold listings on the site yourself when you can.
5. Post each listing yourself and paste in the title and description.
6. When buyers message you, ask the chat for a short, polite reply if you need one. Meet in a public place, and don't accept a check for more than your price.

Help me write listings to sell some things I own. Don't post anything for me.

Where I'm selling: [Facebook Marketplace, eBay, Craigslist, etc.]
My area: [city or region]
Attached: photos of each item.

For each item:
1. Tell me what you think it is (brand, model, size) and how sure you are. Ask me if you can't tell.
2. Write a listing title under 80 characters with the words a buyer would search.
3. Write a short, honest description: what it is, condition, any wear or damage visible in the photos, and pickup or shipping.
4. Search the web for similar items for sale or recently sold and suggest a price range. Link what you based it on.

Rules: Don't invent features, model numbers, or condition details. Mention any damage you can see. If you can't find comparable prices, say so instead of guessing.

Which chat tools work with this prompt?

Paste the prompt into any of these assistants (free or paid tiers).

• ChatGPT
• Claude

What tips make it smoother?

• Photos of the model number or label help the chat find the right comparable listings.
• Overpayment is a common scam. The FTC says if a buyer sends a check for more than your price and asks for the difference back, it's a scam.
• List a few items at a time. A short batch is easier to check than a whole garage at once.

Where do the claims come from?

Summaries use public sources linked below, not independent verification. How setups are picked.

• Read OpenAI Help Center’s write-up (help.openai.com)

  OpenAI Help Center: Free plan users can search the web and upload images or files; uploads have their own usage limit.

• Read OpenAI Help Center’s write-up (help.openai.com)

  OpenAI Help Center: Web search is available on every ChatGPT plan, Free included, within plan usage limits.

• Read Claude Help Center’s write-up (support.claude.com)

  Claude Help Center: How to attach PDFs and photos in a chat: up to 20 files per chat, with per-file size limits.

• Read Anthropic’s write-up (www.anthropic.com)

  Anthropic: Claude Free is $0 and includes web search, memory, and file creation. Claude Pro is $20/mo, or $17/mo billed yearly, and adds unlimited Projects (Free allows up to 5).

• Read FTC Consumer Advice’s write-up (consumer.ftc.gov)

  FTC Consumer Advice: Overpayment scams: a buyer sends a check for more than the price and asks for the balance back. Don't accept a check for more than the selling price.