Spool files huge — choose EMF/XPS/RAW & compression tips

Joe B.

Reviewed for technical accuracy

Specialities: Windows 11/10, macOS (Sonoma/Ventura/Monterey), Printers, Networking, Office Equipment

Spool folder grows fast on Windows 10/11 — EMF vs RAW vs XPS, PCL/PS/PDF, “Enable advanced printing features”

Technician

Hey! We’ll get those spool files under control. Tell me: Windows version, printer model/driver (PCL, PostScript, Universal, or Type 4 v4), and whether you see .SPL/.SHD ballooning in C:\\Windows\\System32\\spool\\PRINTERS. We’ll choose the best data type (EMF/XPS/RAW), adjust WinPrint settings, and apply compression tips in your apps (Word, Excel, Adobe, CAD).

Customer

Windows 11, HP LaserJet Universal PCL6. Our PDF and Excel jobs explode to hundreds of MB — the spool folder is huge and printing is slow over the network.

Technician

Typical reasons spool files get very large:
• Using RAW (PCL/PS) with rasterized transparency, gradients, or big images — data streams expand.
• EMF spooling from 32/64‑bit GDI can duplicate pages or embed uncompressed bitmaps.
• XPS to non‑XPS drivers forces conversion and bloat.
• “Enable advanced printing features” adds page‑level EMF and renders on the server; jobs grow and stall.
• PDFs printed “as image”, or apps exporting high‑DPI PNGs without downsampling/compression.
We’ll pick the best data type (EMF/XPS/RAW) for your driver, then optimize images and flatten transparency to shrink the queue.

Customer

Where do I switch EMF/XPS/RAW and the print processor?

Technician

Choose the right data type (Windows 10/11):
1) Settings → Bluetooth & devices → Printers & scanners → your printer → Printer properties → tab Advanced → Print Processor → select WinPrint and pick RAW, EMF, or XPS.
2) In Advanced, uncheck Enable advanced printing features to avoid per‑page EMF spooling and shrink job size.
3) Try RAW for PCL/PS drivers (smallest on vector docs). Use XPS for v4/XPS‑native drivers. Fall back to EMF only if features require it.

Customer

Does “Print directly to the printer” help with huge spool files?

Technician

Print directly bypasses the disk spool and streams data, which can help on slow or space‑limited PCs — but the app must stay open until the job finishes. For servers/remote shares, keep spooling but select Start printing after last page is spooled for stability with big PDFs/CAD.

Customer

Any app settings to reduce spool size from Word/Excel and Adobe Acrobat?

Technician

Reduce spool size from apps:
• Word/PowerPoint/Excel: File → Options → Advanced → Image Size and Quality → enable Do not compress? Off and choose 220 ppi or 150 ppi; remove hidden layers; prefer vector charts over pasted bitmaps.
• Adobe Acrobat/Reader: avoid “Print as image” unless troubleshooting; use RIP‑compatible driver (PCL6/PS/PDF). For prepress PDFs, File → Save as Other → Reduced Size PDF or Optimize PDF (downsample images, discard transparency where safe).
• Illustrator/CAD: flatten transparency, convert large effects to vector when possible, and embed fonts; avoid giant 600‑dpi bitmaps on office printers.

Customer

Our print server shows jobs rendered on server. Should we switch to “Render print jobs on client computers”?

Technician

Yes — for mixed drivers and large EMF jobs, enabling Render print jobs on client computers keeps server queues small and avoids EMF→RAW conversion bloat. Keep drivers identical across clients, and test with both Type 3 and v4 packages.

Customer

Would switching from PCL to PostScript or PDF driver reduce size?

Technician

Driver matters: vector‑heavy office docs are smallest with PCL6 RAW; transparency/gradients from Adobe tools often spool smaller via PS or vendor PDF drivers. Try each with Enable advanced printing features off and measure .SPL sizes.

Customer

What about cleaning the Spool folder safely?

Technician

Stop the Print Spooler service, clear C:\\Windows\\System32\\spool\\PRINTERS, then start the service. Don’t delete driver files in drivers\\x64. If queues re‑inflate, revisit data type, print processor, and app compression.

Customer

Can you recap the exact settings to make spool files smaller and speed up printing?

Technician

Summary: Use WinPrint with the smallest data type for your driver (RAW PCL/PS or XPS for v4). Turn Enable advanced printing features OFF, print at native size, downsample images, avoid “Print as image”, and consider client‑side rendering. Need help testing PCL vs PS vs PDF drivers? Open the chat and we’ll benchmark live.

Customer

Nice — spool files are a fraction of the size and jobs leave the queue instantly.

Quick answer: the accepted fix

Accepted fix when spool files are huge: set WinPrint → RAW (PCL/PS) or XPS for v4 drivers, turn Enable advanced printing features off, avoid “Print as image”, and downsample/compress images before printing. For servers, enable Render on client computers.

FAQ

Step‑by‑step (Windows 10/11)

1. Open Printer properties → Advanced → Print Processor → choose WinPrint and RAW (or XPS for v4).
2. Uncheck Enable advanced printing features. Select Start printing after last page is spooled for stability.
3. In apps, downsample images (150–220 ppi) and avoid “Print as image”.
4. On a server share, enable Render print jobs on client computers.
5. Test PCL6 vs PS/PDF drivers; keep the smallest/fastest combo.

macOS notes

1. Prefer vendor AirPrint/PDF queues; avoid app “Print as image”.
2. From Preview/Acrobat, choose Scale = 100% and export optimized PDFs before printing.

Sources

• Microsoft — Print architecture (EMF/XPS, processors)
• HP — Universal Print Driver (PCL/PS/PDF)
• Adobe — Printing best practices

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