Add documentation for all PDF tools

docs/tools/pdf-to-excel.md

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+---
+title: PDF to Excel
+description: Extract tables from PDF documents into an Excel spreadsheet. Each table gets its own worksheet with page references.
+---
+
+# PDF to Excel
+
+Extracts tables from a PDF and saves them as an Excel (`.xlsx`) spreadsheet. Each detected table is placed on its own worksheet, labeled with its table number and source page. Powered by PyMuPDF for table detection and the SheetJS library for Excel generation.
+
+## How It Works
+
+1. Upload a PDF by clicking the drop zone or dragging a file onto it.
+2. Click **Convert** to start table extraction.
+3. The tool scans every page for tables, then builds an Excel workbook.
+4. A `.xlsx` file downloads with one sheet per table.
+
+## Options
+
+This tool has no configurable options. All detected tables are extracted automatically.
+
+## Output Format
+
+- A single `filename.xlsx` file.
+- **One table**: a single worksheet named "Table".
+- **Multiple tables**: worksheets named "Table 1 (Page 3)", "Table 2 (Page 5)", etc. Sheet names are truncated to 31 characters (the Excel limit).
+
+## Use Cases
+
+- Converting PDF financial reports into editable spreadsheets for further analysis.
+- Extracting inventory or order tables from supplier PDFs.
+- Pulling structured data from PDF forms or catalogs into Excel for sorting and filtering.
+- Archiving tabular PDF data in a format that non-technical colleagues can work with.
+
+## Tips
+
+- If the tool reports "No Tables Found", the PDF likely uses free-flowing text layout rather than structured tables. Try [PDF to Text](./pdf-to-text) to grab the raw content instead.
+- For a simpler flat format, use [PDF to CSV](./pdf-to-csv). For per-table downloads in multiple formats, use [Extract Tables](./extract-tables).
+- Review the sheet names to identify which page each table came from.
+
+## Related Tools
+
+- [PDF to CSV](./pdf-to-csv)
+- [Extract Tables](./extract-tables)
+- [PDF to Text](./pdf-to-text)