Stop uploading PDFs to ChatGPT: six file types that keep your tables, slides, and documents intact
The PDF is the easiest thing to hand an AI chatbot, and it is usually the worst thing you can hand it.
Oluwademilade Afolabi argues that exporting to PDF flattens structure, so ChatGPT ends up reading a flattened, static version of your spreadsheet instead of the spreadsheet. He names six formats that keep the structure intact: CSV for a single clean table, XLSX for a workbook whose sheet boundaries and calculated values survive, JSON for nested app exports and logs, DOCX for prose you want reorganized by heading, PPTX for slide order and information density, and PNG for a screenshot of an error message, an interface, or a receipt. He is honest about the limits: what you can upload depends on your model, plan, and workspace settings, embedded images inside DOCX and PPTX are not officially supported, image reading gets unreliable with tiny text, rotated pages, or complicated charts, and he advises validating a JSON file before you send it and keeping the dataset open beside you when exact values matter.
