DOCX creation, editing, and analysis

Overview

A .docx file is a ZIP archive containing XML files.

Quick Reference

Converting .doc to .docx

Legacy .doc files must be converted before editing:

python scripts/office/soffice.py --headless --convert-to docx document.doc

Reading Content

# Text extraction with tracked changes
pandoc --track-changes=all document.docx -o output.md

# Raw XML access
python scripts/office/unpack.py document.docx unpacked/

Converting to Images

python scripts/office/soffice.py --headless --convert-to pdf document.docx
pdftoppm -jpeg -r 150 document.pdf page

Accepting Tracked Changes

To produce a clean document with all tracked changes accepted (requires LibreOffice):

python scripts/accept_changes.py input.docx output.docx

Creating New Documents

Generate .docx files with JavaScript, then validate. Install: npm install -g docx

Setup

const { Document, Packer, Paragraph, TextRun, Table, TableRow, TableCell, ImageRun,
        Header, Footer, AlignmentType, PageOrientation, LevelFormat, ExternalHyperlink,
        TableOfContents, HeadingLevel, BorderStyle, WidthType, ShadingType,
        VerticalAlign, PageNumber, PageBreak } = require('docx');

const doc = new Document({ sections: [{ children: [/* content */] }] });
Packer.toBuffer(doc).then(buffer => fs.writeFileSync("doc.docx", buffer));

Validation

After creating the file, validate it. If validation fails, unpack, fix the XML, and repack.

python scripts/office/validate.py doc.docx

Page Size

// CRITICAL: docx-js defaults to A4, not US Letter
// Always set page size explicitly for consistent results
sections: [{
  properties: {
    page: {
      size: {
        width: 12240,   // 8.5 inches in DXA
        height: 15840   // 11 inches in DXA
      },
      margin: { top: 1440, right: 1440, bottom: 1440, left: 1440 } // 1 inch margins
    }
  },
  children: [/* content */]
}]

Common page sizes (DXA units, 1440 DXA = 1 inch):

Landscape orientation: docx-js swaps width/height internally, so pass portrait dimensions and let it handle the swap:

size: {
  width: 12240,   // Pass SHORT edge as width
  height: 15840,  // Pass LONG edge as height
  orientation: PageOrientation.LANDSCAPE  // docx-js swaps them in the XML
},
// Content width = 15840 - left margin - right margin (uses the long edge)

Styles (Override Built-in Headings)

Use Arial as the default font (universally supported). Keep titles black for readability.

const doc = new Document({
  styles: {
    default: { document: { run: { font: "Arial", size: 24 } } }, // 12pt default
    paragraphStyles: [
      // IMPORTANT: Use exact IDs to override built-in styles
      { id: "Heading1", name: "Heading 1", basedOn: "Normal", next: "Normal", quickFormat: true,
        run: { size: 32, bold: true, font: "Arial" },
        paragraph: { spacing: { before: 240, after: 240 }, outlineLevel: 0 } }, // outlineLevel required for TOC
      { id: "Heading2", name: "Heading 2", basedOn: "Normal", next: "Normal", quickFormat: true,
        run: { size: 28, bold: true, font: "Arial" },
        paragraph: { spacing: { before: 180, after: 180 }, outlineLevel: 1 } },
    ]
  },
  sections: [{
    children: [
      new Paragraph({ heading: HeadingLevel.HEADING_1, children: [new TextRun("Title")] }),
    ]
  }]
});

Lists (NEVER use unicode bullets)

// ❌ WRONG - never manually insert bullet characters
new Paragraph({ children: [new TextRun("• Item")] })  // BAD
new Paragraph({ children: [new TextRun("\u2022 Item")] })  // BAD

// ✅ CORRECT - use numbering config with LevelFormat.BULLET
const doc = new Document({
  numbering: {
    config: [
      { reference: "bullets",
        levels: [{ level: 0, format: LevelFormat.BULLET, text: "•", alignment: AlignmentType.LEFT,
          style: { paragraph: { indent: { left: 720, hanging: 360 } } } }] },
      { reference: "numbers",
        levels: [{ level: 0, format: LevelFormat.DECIMAL, text: "%1.", alignment: AlignmentType.LEFT,
          style: { paragraph: { indent: { left: 720, hanging: 360 } } } }] },
    ]
  },
  sections: [{
    children: [
      new Paragraph({ numbering: { reference: "bullets", level: 0 },
        children: [new TextRun("Bullet item")] }),
      new Paragraph({ numbering: { reference: "numbers", level: 0 },
        children: [new TextRun("Numbered item")] }),
    ]
  }]
});

// ⚠️ Each reference creates INDEPENDENT numbering
// Same reference = continues (1,2,3 then 4,5,6)
// Different reference = restarts (1,2,3 then 1,2,3)

Tables

CRITICAL: Tables need dual widths - set both columnWidths on the table AND width on each cell. Without both, tables render incorrectly on some platforms.

// CRITICAL: Always set table width for consistent rendering
// CRITICAL: Use ShadingType.CLEAR (not SOLID) to prevent black backgrounds
const border = { style: BorderStyle.SINGLE, size: 1, color: "CCCCCC" };
const borders = { top: border, bottom: border, left: border, right: border };

new Table({
  width: { size: 9360, type: WidthType.DXA }, // Always use DXA (percentages break in Google Docs)
  columnWidths: [4680, 4680], // Must sum to table width (DXA: 1440 = 1 inch)
  rows: [
    new TableRow({
      children: [
        new TableCell({
          borders,
          width: { size: 4680, type: WidthType.DXA }, // Also set on each cell
          shading: { fill: "D5E8F0", type: ShadingType.CLEAR }, // CLEAR not SOLID
          margins: { top: 80, bottom: 80, left: 120, right: 120 }, // Cell padding (internal, not added to width)
          children: [new Paragraph({ children: [new TextRun("Cell")] })]
        })
      ]
    })
  ]
})

Table width calculation:

Always use WidthType.DXA — WidthType.PERCENTAGE breaks in Google Docs.

// Table width = sum of columnWidths = content width
// US Letter with 1" margins: 12240 - 2880 = 9360 DXA
width: { size: 9360, type: WidthType.DXA },
columnWidths: [7000, 2360]  // Must sum to table width

Width rules:

• Always use WidthType.DXA — never WidthType.PERCENTAGE (incompatible with Google Docs)
• Table width must equal the sum of columnWidths
• Cell width must match corresponding columnWidth
• Cell margins are internal padding - they reduce content area, not add to cell width
• For full-width tables: use content width (page width minus left and right margins)

Images

// CRITICAL: type parameter is REQUIRED
new Paragraph({
  children: [new ImageRun({
    type: "png", // Required: png, jpg, jpeg, gif, bmp, svg
    data: fs.readFileSync("image.png"),
    transformation: { width: 200, height: 150 },
    altText: { title: "Title", description: "Desc", name: "Name" } // All three required
  })]
})

Page Breaks

// CRITICAL: PageBreak must be inside a Paragraph
new Paragraph({ children: [new PageBreak()] })

// Or use pageBreakBefore
new Paragraph({ pageBreakBefore: true, children: [new TextRun("New page")] })

Table of Contents

// CRITICAL: Headings must use HeadingLevel ONLY - no custom styles
new TableOfContents("Table of Contents", { hyperlink: true, headingStyleRange: "1-3" })

Headers/Footers

sections: [{
  properties: {
    page: { margin: { top: 1440, right: 1440, bottom: 1440, left: 1440 } } // 1440 = 1 inch
  },
  headers: {
    default: new Header({ children: [new Paragraph({ children: [new TextRun("Header")] })] })
  },
  footers: {
    default: new Footer({ children: [new Paragraph({
      children: [new TextRun("Page "), new TextRun({ children: [PageNumber.CURRENT] })]
    })] })
  },
  children: [/* content */]
}]

Critical Rules for docx-js

• Set page size explicitly - docx-js defaults to A4; use US Letter (12240 x 15840 DXA) for US documents
• Landscape: pass portrait dimensions - docx-js swaps width/height internally; pass short edge as width, long edge as height, and set orientation: PageOrientation.LANDSCAPE
• Never use \ - use separate Paragraph elements
• Never use unicode bullets - use LevelFormat.BULLET with numbering config
• PageBreak must be in Paragraph - standalone creates invalid XML
• ImageRun requires type - always specify png/jpg/etc
• Always set table width with DXA - never use WidthType.PERCENTAGE (breaks in Google Docs)
• Tables need dual widths - columnWidths array AND cell width, both must match
• Table width = sum of columnWidths - for DXA, ensure they add up exactly
• Always add cell margins - use margins: { top: 80, bottom: 80, left: 120, right: 120 } for readable padding
• Use ShadingType.CLEAR - never SOLID for table shading
• TOC requires HeadingLevel only - no custom styles on heading paragraphs
• Override built-in styles - use exact IDs: "Heading1", "Heading2", etc.
• Include outlineLevel - required for TOC (0 for H1, 1 for H2, etc.)

Editing Existing Documents

Follow all 3 steps in order.

Step 1: Unpack

python scripts/office/unpack.py document.docx unpacked/

Extracts XML, pretty-prints, merges adjacent runs, and converts smart quotes to XML entities (“ etc.) so they survive editing. Use --merge-runs false to skip run merging.

Step 2: Edit XML

Edit files in unpacked/word/. See XML Reference below for patterns.

Use "Claude" as the author for tracked changes and comments, unless the user explicitly requests use of a different name.

Use the Edit tool directly for string replacement. Do not write Python scripts. Scripts introduce unnecessary complexity. The Edit tool shows exactly what is being replaced.

CRITICAL: Use smart quotes for new content. When adding text with apostrophes or quotes, use XML entities to produce smart quotes:

\x3C!-- Use these entities for professional typography -->
\x3Cw:t>Here’s a quote: “Hello”\x3C/w:t>

Adding comments: Use comment.py to handle boilerplate across multiple XML files (text must be pre-escaped XML):

python scripts/comment.py unpacked/ 0 "Comment text with & and ’"
python scripts/comment.py unpacked/ 1 "Reply text" --parent 0  # reply to comment 0
python scripts/comment.py unpacked/ 0 "Text" --author "Custom Author"  # custom author name

Then add markers to document.xml (see Comments in XML Reference).

Step 3: Pack

python scripts/office/pack.py unpacked/ output.docx --original document.docx

Validates with auto-repair, condenses XML, and creates DOCX. Use --validate false to skip.

Auto-repair will fix:

• durableId >= 0x7FFFFFFF (regenerates valid ID)
• Missing xml:space="preserve" on \x3Cw:t> with whitespace

Auto-repair won't fix:

• Malformed XML, invalid element nesting, missing relationships, schema violations

Common Pitfalls

• Replace entire \x3Cw:r> elements: When adding tracked changes, replace the whole \x3Cw:r>...\x3C/w:r> block with \x3Cw:del>...\x3Cw:ins>... as siblings. Don't inject tracked change tags inside a run.
• Preserve \x3Cw:rPr> formatting: Copy the original run's \x3Cw:rPr> block into your tracked change runs to maintain bold, font size, etc.

XML Reference

Schema Compliance

• Element order in \x3Cw:pPr>: \x3Cw:pStyle>, \x3Cw:numPr>, \x3Cw:spacing>, \x3Cw:ind>, \x3Cw:jc>, \x3Cw:rPr> last
• Whitespace: Add xml:space="preserve" to \x3Cw:t> with leading/trailing spaces
• RSIDs: Must be 8-digit hex (e.g., 00AB1234)

Tracked Changes

Insertion:

\x3Cw:ins w:id="1" w:author="Claude" w:date="2025-01-01T00:00:00Z">
  \x3Cw:r>\x3Cw:t>inserted text\x3C/w:t>\x3C/w:r>
\x3C/w:ins>

Deletion:

\x3Cw:del w:id="2" w:author="Claude" w:date="2025-01-01T00:00:00Z">
  \x3Cw:r>\x3Cw:delText>deleted text\x3C/w:delText>\x3C/w:r>
\x3C/w:del>

Inside \x3Cw:del>: Use \x3Cw:delText> instead of \x3Cw:t>, and \x3Cw:delInstrText> instead of \x3Cw:instrText>.

Minimal edits - only mark what changes:

\x3C!-- Change "30 days" to "60 days" -->
\x3Cw:r>\x3Cw:t>The term is \x3C/w:t>\x3C/w:r>
\x3Cw:del w:id="1" w:author="Claude" w:date="...">
  \x3Cw:r>\x3Cw:delText>30\x3C/w:delText>\x3C/w:r>
\x3C/w:del>
\x3Cw:ins w:id="2" w:author="Claude" w:date="...">
  \x3Cw:r>\x3Cw:t>60\x3C/w:t>\x3C/w:r>
\x3C/w:ins>
\x3Cw:r>\x3Cw:t> days.\x3C/w:t>\x3C/w:r>

Deleting entire paragraphs/list items - when removing ALL content from a paragraph, also mark the paragraph mark as deleted so it merges with the next paragraph. Add \x3Cw:del/> inside \x3Cw:pPr>\x3Cw:rPr>:

\x3Cw:p>
  \x3Cw:pPr>
    \x3Cw:numPr>...\x3C/w:numPr>  \x3C!-- list numbering if present -->
    \x3Cw:rPr>
      \x3Cw:del w:id="1" w:author="Claude" w:date="2025-01-01T00:00:00Z"/>
    \x3C/w:rPr>
  \x3C/w:pPr>
  \x3Cw:del w:id="2" w:author="Claude" w:date="2025-01-01T00:00:00Z">
    \x3Cw:r>\x3Cw:delText>Entire paragraph content being deleted...\x3C/w:delText>\x3C/w:r>
  \x3C/w:del>
\x3C/w:p>

Without the \x3Cw:del/> in \x3Cw:pPr>\x3Cw:rPr>, accepting changes leaves an empty paragraph/list item.

Rejecting another author's insertion - nest deletion inside their insertion:

\x3Cw:ins w:author="Jane" w:id="5">
  \x3Cw:del w:author="Claude" w:id="10">
    \x3Cw:r>\x3Cw:delText>their inserted text\x3C/w:delText>\x3C/w:r>
  \x3C/w:del>
\x3C/w:ins>

Restoring another author's deletion - add insertion after (don't modify their deletion):

\x3Cw:del w:author="Jane" w:id="5">
  \x3Cw:r>\x3Cw:delText>deleted text\x3C/w:delText>\x3C/w:r>
\x3C/w:del>
\x3Cw:ins w:author="Claude" w:id="10">
  \x3Cw:r>\x3Cw:t>deleted text\x3C/w:t>\x3C/w:r>
\x3C/w:ins>

Comments

After running comment.py (see Step 2), add markers to document.xml. For replies, use --parent flag and nest markers inside the parent's.

CRITICAL: \x3Cw:commentRangeStart> and \x3Cw:commentRangeEnd> are siblings of \x3Cw:r>, never inside \x3Cw:r>.

\x3C!-- Comment markers are direct children of w:p, never inside w:r -->
\x3Cw:commentRangeStart w:id="0"/>
\x3Cw:del w:id="1" w:author="Claude" w:date="2025-01-01T00:00:00Z">
  \x3Cw:r>\x3Cw:delText>deleted\x3C/w:delText>\x3C/w:r>
\x3C/w:del>
\x3Cw:r>\x3Cw:t> more text\x3C/w:t>\x3C/w:r>
\x3Cw:commentRangeEnd w:id="0"/>
\x3Cw:r>\x3Cw:rPr>\x3Cw:rStyle w:val="CommentReference"/>\x3C/w:rPr>\x3Cw:commentReference w:id="0"/>\x3C/w:r>

\x3C!-- Comment 0 with reply 1 nested inside -->
\x3Cw:commentRangeStart w:id="0"/>
  \x3Cw:commentRangeStart w:id="1"/>
  \x3Cw:r>\x3Cw:t>text\x3C/w:t>\x3C/w:r>
  \x3Cw:commentRangeEnd w:id="1"/>
\x3Cw:commentRangeEnd w:id="0"/>
\x3Cw:r>\x3Cw:rPr>\x3Cw:rStyle w:val="CommentReference"/>\x3C/w:rPr>\x3Cw:commentReference w:id="0"/>\x3C/w:r>
\x3Cw:r>\x3Cw:rPr>\x3Cw:rStyle w:val="CommentReference"/>\x3C/w:rPr>\x3Cw:commentReference w:id="1"/>\x3C/w:r>

Images

1. Add image file to word/media/
2. Add relationship to word/_rels/document.xml.rels:

\x3CRelationship Id="rId5" Type=".../image" Target="media/image1.png"/>

3. Add content type to [Content_Types].xml:

\x3CDefault Extension="png" ContentType="image/png"/>

4. Reference in document.xml:

\x3Cw:drawing>
  \x3Cwp:inline>
    \x3Cwp:extent cx="914400" cy="914400"/>  \x3C!-- EMUs: 914400 = 1 inch -->
    \x3Ca:graphic>
      \x3Ca:graphicData uri=".../picture">
        \x3Cpic:pic>
          \x3Cpic:blipFill>\x3Ca:blip r:embed="rId5"/>\x3C/pic:blipFill>
        \x3C/pic:pic>
      \x3C/a:graphicData>
    \x3C/a:graphic>
  \x3C/wp:inline>
\x3C/w:drawing>

Dependencies

• pandoc: Text extraction
• docx: npm install -g docx (new documents)
• LibreOffice: PDF conversion (auto-configured for sandboxed environments via scripts/office/soffice.py)
• Poppler: pdftoppm for images