Parsing DOCX, PPTX, and XLSX into clean text for LLM ingestion

Office documents are the default file format inside most organizations. Proposals use DOCX, decks use PPTX, financial models use XLSX. An ingestion pipeline that indexes everything the business has must read all three formats eventually. Each one lives in a different library, with a different API and different failure modes. Each library also carries its own maintenance burden.

Three formats, three libraries, three sets of edge cases

A typical Python stack ends up with python-docx for Word, python-pptx for PowerPoint, and openpyxl or pandas for Excel. Each is reasonably good at what it does, but together they create real overhead:

• Three APIs to learn and maintain. Extracting “the text” means writing and testing three separate code paths. Each has its own object model: paragraphs and runs, slides and shapes, sheets and rows and cells.
• Version drift. DOCX, PPTX, and XLSX are all OOXML under the hood. But library versions lag behind Office’s own format changes. A document saved from a newer Office build can trip up an older library version. These failures are often hard to reproduce locally.
• Inconsistent handling of “weird” content. This content includes text inside a table cell, inside a text box on a slide, or inside a merged Excel range. It also includes text in headers, footers, and speaker notes. Each library supports these cases differently, and the support is often poorly documented. As a result, “extract the text” quietly means different things depending on which file type hit your pipeline.
• No shared error handling. A corrupt DOCX raises a different exception than a corrupt XLSX. Your pipeline’s retry and logging logic has to special-case each library’s failure modes.

None of this is hard, exactly. It’s just three times the surface area for a problem that stays conceptually the same each time: turn a document into text.

One call, regardless of which Office format it is

txtfetch runs all three formats through Apache Tika. Tika normalizes DOCX, PPTX, and XLSX into the same extraction path, along with their legacy .doc/.ppt/.xls counterparts and ODF equivalents. You don’t branch on file type. You send the file, and the response is identical in shape, regardless of what came in.

A Word proposal:

curl -X POST https://api.txtfetch.com/v1/extract \
  -H "Authorization: Bearer $TXTFETCH_KEY" \
  -F file=@proposal.docx

A slide deck:

curl -X POST https://api.txtfetch.com/v1/extract \
  -H "Authorization: Bearer $TXTFETCH_KEY" \
  -F file=@quarterly-review.pptx

A spreadsheet, fetched straight from wherever it’s hosted instead of downloaded first:

curl -X POST "https://api.txtfetch.com/v1/extract?url=https://example.com/models/forecast.xlsx" \
  -H "Authorization: Bearer $TXTFETCH_KEY"

All three return the same JSON shape:

{
  "status": "success",
  "extracted_text": "Q3 Forecast\nRegion: North America\nRevenue: 4.2M..."
}

Table cells, slide text and notes, and sheet contents all come back as part of extracted_text. This flattens everything into the same linear text your chunker already expects from a PDF or an HTML page. The rest of your ingestion code doesn’t need a special branch for “this one came from Excel.”

Fewer parsers, fewer things to patch

Dropping three format-specific libraries for one HTTP call has real benefits. There’s one thing to version, and one place to fix when a document category starts behaving oddly. Errors come back in the same shape too: {"status": "error", "error": "..."}. You stop tracking python-docx, python-pptx, and openpyxl release notes for compatibility breaks. For a document-heavy ingestion pipeline, “read anything from the business” is a hard requirement. That’s the whole point: less code exists purely to keep up with file formats.

Want to point it at your own DOCX/PPTX/XLSX archive? Get in touch and we’ll set you up with an API key.