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Turn a photo or PDF of a size chart into a table with your AI assistant

Suppliers often send size charts as a photo, a screenshot or a page in a PDF catalog. Typing those numbers into your store by hand is slow, and typos in a size chart turn into returns. If you already use an AI assistant such as ChatGPT, Claude or Gemini, it can read the chart for you. This guide gives you an instruction to copy, and a short checklist for the mistakes assistants make.

You don’t need any app for the first three steps.

1. Get a clear picture of the chart

  • Crop to the chart. Leave out the model photos and the rest of the page.
  • Keep it straight and sharp. If you can’t read a number yourself, the assistant can’t either.
  • If the chart is spread over several pages, send one page at a time.
  • If the supplier sent the chart as text in an email, you can paste the text instead of a picture.

Before you upload: the file goes to the company that runs your assistant. If your supplier’s documents are confidential, check that you are allowed to share them.

2. Give the assistant this instruction

Attach the picture or PDF and paste this:

Read the size chart in the image or file I attach (or in the text I paste below) and rewrite it as a table for my store's size chart app.

Rules:
- Reply with a Markdown table and nothing else. No introduction and no notes.
- Above the table, write one line with the chart's name and unit, like this: # Women's tops (cm)  or  # Women's tops (in)
- First row: column titles. First column: the size name (S, M, L or 38, 40). One row per size.
- Put only numbers in the measurement cells. Write a range as 86-91. Do not write cm or in inside the cells.
- If the chart gives both centimeters and inches, keep only centimeters.
- Copy every number exactly as shown. If you cannot read a number, leave that cell empty. Never guess.
- If there are several charts (for example men's and women's), write a name line and a table for each one.

If you work in inches, change “keep only centimeters” to “keep only inches”.

Why the rules are written this way:

  • “Copy every number exactly” and “Never guess”: an assistant that is unsure tends to fill the gap with a number that looks right. An empty cell is easy to spot; a wrong number is not.
  • “Keep only centimeters”: charts with both units in one cell (38 cm / 15 in) are where numbers get mixed up. Keeping one side avoids that. Do not ask the assistant to convert between units: let it copy, and convert later with a tool you trust.
  • “Nothing else”: without it, you get explanations around the table that you have to delete.

3. Check the answer against the original

Always do this. It takes a minute, and assistants do make mistakes with small print.

  • Count the rows and columns. Is every size there? Is every measurement there?
  • Read the first and the last row number by number.
  • Look down each column. The numbers should rise steadily from the smallest size to the largest. A number that jumps or goes backwards is usually a misread digit (3 and 8, 1 and 7, 5 and 6).
  • Check the unit. A women’s M with a chest of 36 is inches; 92 is centimeters.
  • Check empty cells. Fill them from the original, or ask your supplier.
  • Check the column titles. Is it the body measurement or the garment measurement? If the original doesn’t say, ask your supplier before you publish.

4. Put the table in your store

  • In a spreadsheet: ask the assistant, “Give me the same table as CSV”, save the answer as a .csv file, and open it in Google Sheets, Excel or Numbers.
  • On a product page without an app: type or paste the table into the product’s description or an extra information section, if your store builder supports tables there.
  • In a size chart app: many apps accept a CSV file or a pasted table.

Our app: Fairsize

We make Fairsize: Size Chart & Guide. You can paste the assistant’s answer as it is: Fairsize reads the table, takes the chart’s name and unit from the line above it, and removes units written inside the cells without changing the numbers. The same instruction is inside the app, ready to copy. Your assistant does the reading, so Fairsize does not upload your photo or PDF anywhere and adds no AI usage limit of its own. Shoppers can then switch between cm and inches on the product page. A free plan is available.

See Fairsize

Questions about this guide: contact@han-x.com