Google Sheets → Excel

My Google Sheets export has millions of empty rows and columns

You exported a modest Sheet, but the Excel file is huge and slow, the scrollbar thinks there are millions of rows, and pressing Ctrl+End jumps miles past your last real cell.

What’s actually breaking

Every spreadsheet tracks a used range — the rectangle from A1 to the furthest cell it considers “in use.” Google Sheets is generous about what counts: a stray format applied to a whole column, a leftover value far down a sheet, or just the sheet’s default grid can push that boundary out to enormous dimensions. When the file is exported, that inflated used range comes with it — so Excel believes the sheet spans far more rows and columns than actually hold data. The file balloons, opens slowly, and formulas that reference whole columns do needless work.

How xlsx-for-ai handles it

xlsx-for-ai has a dedicated profile for Google-Sheets exports that detects this phantom dimension bloat and flags it. When it reads a workbook whose declared used range is far larger than its real data, it recognises the pattern and calls it out, so a 40 MB file that holds a few thousand real cells isn’t a mystery — you’re told the used range is inflated and by roughly how much.

The claim here is detection and disclosure: we surface the bloat so it’s not invisible. That’s the piece that’s live and regression-guarded today. Trimming the sheet back to its true extent is then a deliberate step you take in Excel — select the empty rows below your data and the empty columns to the right, delete them, and save — rather than something that happens to your file without your say-so.

How to check your file

  1. Add the connector to Claude once — open Settings → Connectors → Add custom connector and paste https://api.xlsx-for-ai.dev/mcp/claude. Full steps are on the developers page.
  2. Read the live Sheet by id. In Claude, ask: 
    Read this Google Sheet and convert it to an .xlsx, with xfa.
Flag anything that won't survive the conversion:
https://docs.google.com/spreadsheets/d/YOUR_SHEET_ID/edit
    Reading a live Sheet is read-only and uses a read-only Google token you supply — see the developers page for the one-time setup.
  3. Or skip the token — in Google Sheets choose File → Download → Microsoft Excel (.xlsx), then ask Claude to “read this file with xfa and tell me what it flagged.” Same reader, same flags.
  4. Read the flags. The result tells you exactly what it did and what it couldn’t carry across — so you review a short list instead of hunting for a wrong number later.
To slim the file in Excel: click the first empty row under your data, press Ctrl+Shift+↓ and delete; do the same for empty columns to the right; then save. The phantom used range collapses to your real data.

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