document-processing

Use when working with "PDF", "Excel", "Word", "PowerPoint", "XLSX", "DOCX", "PPTX", "spreadsheets", "presentations", "extract text", "merge documents", "convert documents", or asking about "office document manipulation"

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In the catalog since: 1 Oct 2026
From: eyadsibai/ltk

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Skill instructions

Rendered from the published SKILL.md, 172 lines.

Document Processing Guide

Work with office documents: PDF, Excel, Word, and PowerPoint.

Format Overview

Format	Extension	Structure	Best For
PDF	.pdf	Binary/text	Reports, forms, archives
Excel	.xlsx	XML in ZIP	Data, calculations, models
Word	.docx	XML in ZIP	Text documents, contracts
PowerPoint	.pptx	XML in ZIP	Presentations, slides

Key concept: XLSX, DOCX, and PPTX are all ZIP archives containing XML files. You can unzip them to access raw content.

PDF Processing

PDF Tools

Task	Best Tool
Basic read/write	pypdf
Text extraction	pdfplumber
Table extraction	pdfplumber
Create PDFs	reportlab
OCR scanned PDFs	pytesseract + pdf2image
Command line	qpdf, pdftotext

Common Operations

Operation	Approach
Merge	Loop through files, add pages to writer
Split	Create new writer per page
Extract tables	Use pdfplumber, convert to DataFrame
Rotate	Call `.rotate(degrees)` on page
Encrypt	Use writer's `.encrypt()` method
OCR	Convert to images, run pytesseract

Excel Processing

Excel Tools

Task	Best Tool
Data analysis	pandas
Formulas & formatting	openpyxl
Simple CSV	pandas
Financial models	openpyxl

Critical Rule: Use Formulas

Approach	Result
Wrong: Calculate in Python, write value	Static number, breaks when data changes
Right: Write Excel formula	Dynamic, recalculates automatically

Financial Model Standards

Convention	Meaning
Blue text	Hardcoded inputs
Black text	Formulas
Green text	Links to other sheets
Yellow fill	Needs attention

Common Formula Errors

Error	Cause
#REF!	Invalid cell reference
#DIV/0!	Division by zero
#VALUE!	Wrong data type
#NAME?	Unknown function name

Word Processing

Word Tools

Task	Best Tool
Text extraction	pandoc
Create new	python-docx or docx-js
Simple edits	python-docx
Tracked changes	Direct XML editing

Document Structure

File	Contains
`word/document.xml`	Main content
`word/comments.xml`	Comments
`word/media/`	Images

Tracked Changes (Redlining)

Element	XML Tag
Deletion	`<w:del><w:delText>...</w:delText></w:del>`
Insertion	`<w:ins><w:t>...</w:t></w:ins>`

Key concept: For professional/legal documents, use tracked changes XML rather than replacing text directly.

PowerPoint Processing

PowerPoint Tools

Task	Best Tool
Text extraction	markitdown

Show the whole skill (52 more lines)

Slide Structure

Path	Contains
`ppt/slides/slide{N}.xml`	Slide content
`ppt/notesSlides/`	Speaker notes
`ppt/slideMasters/`	Master templates
`ppt/media/`	Images

Design Principles

Principle	Guideline
Fonts	Use web-safe: Arial, Helvetica, Georgia
Layout	Two-column preferred, avoid vertical stacking
Hierarchy	Size, weight, color for emphasis
Consistency	Repeat patterns across slides

Converting Between Formats

Conversion	Tool
Any → PDF	LibreOffice headless
PDF → Images	pdftoppm
DOCX → Markdown	pandoc
Any → Text	Appropriate extractor

Best Practices

Practice	Why
Use formulas in Excel	Dynamic calculations
Preserve formatting on edit	Don't lose styles
Test output opens correctly	Catch corruption early
Use tracked changes for contracts	Audit trail
Extract to markdown for analysis	Easier to process

Common Packages

Language	Packages
Python	pypdf, pdfplumber, openpyxl, python-docx, python-pptx
JavaScript	docx, pptxgenjs
CLI	pandoc, qpdf, pdftotext, libreoffice

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  "tool": "retrieve_skill_bundle",
  "arguments": {
    "query": "document-processing"
  }
}

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