The real differences between PCL 5e and PCL 6
Two HP-developed page description languages that share branding but differ substantially in architecture, performance, and compatibility — and how to decide which to deploy on the office MFP.
PCL (Printer Command Language) is the dominant page description language for office printing, developed by HP in the 1980s and adopted broadly across the industry. PCL 5e and PCL 6 are the two versions most office MFPs support today. The naming suggests an incremental update; the reality is that PCL 6 is a fundamentally different architecture from PCL 5e and the two coexist for compatibility rather than progression. This article unpacks the actual differences.
The two languages at a glance
Stream-based, text-anchored
Released 1996. Stream-oriented language where the host sends print commands sequentially, building the page top-to-bottom. Optimised for text-heavy documents and simple graphics.
Mature, broadly compatible with legacy systems, and well-understood by network administrators. Spool files are typically larger than PCL 6 because the language is more verbose.
Object-based, modern architecture
Released 1995, evolved continuously. Object-oriented language describing the page as a collection of graphical objects rather than a stream of commands. Optimised for modern graphical applications.
Smaller spool files, faster rendering on the device, better support for complex graphics and transparency. Slightly less broadly compatible with legacy systems.
Architectural differences explained
PCL 5e is essentially a typewriter language extended for graphics — the print job is a sequence of commands moving a virtual cursor across the page, setting fonts, positioning text, and inserting graphic elements. The language reflects its 1980s origins in line-printer extensions.
PCL 6 (also called PCL XL) was redesigned from scratch around 1995 as a modern page description language. It describes pages as a set of objects (text blocks, vector graphics, raster images, transparency layers) with associated properties, and the device's RIP renders the assembled page. The architecture is closer to PostScript or PDF than to the original PCL line of languages.
Performance and compatibility differences
| Aspect | PCL 5e | PCL 6 (PCL XL) |
|---|---|---|
| Spool file size | Larger | 20-40% smaller typically |
| Render speed on device | Slower for complex pages | Faster for graphics-heavy |
| Text rendering | Excellent | Excellent |
| Complex graphics | Limited | Native support |
| Transparency | Not supported | Supported |
| Legacy system compatibility | Excellent (Unix, AS/400, mainframe) | Limited |
| Cross-platform consistency | Variable | More consistent |
| Network bandwidth use | Higher | Lower |
When to use PCL 5e
Use PCL 5e when
Older ERP systems, AS/400 environments, and mainframe spoolers often generate PCL 5e output. Compatibility is the deciding factor.
Pre-printed forms overlay reliably in PCL 5e. The stream-based architecture makes positioning predictable for forms-on-forms applications.
For pure text printing, PCL 5e's overhead is negligible and the broad compatibility is valuable.
PCL 5e is more uniformly implemented across MFP vendors than PCL 6, producing more consistent output when printing to multiple device brands.
When to use PCL 6
Use PCL 6 when
Office productivity applications (Word, Excel, PowerPoint, Google Workspace) produce better output through PCL 6 due to native graphics handling.
Documents with complex shapes, gradients, transparency, or layered graphics render faster and more accurately through PCL 6.
Smaller spool files reduce network bandwidth consumption — meaningful for offices with limited WAN connectivity or VPN-routed print traffic.
For new deployments without legacy compatibility requirements, PCL 6 is the right default. The smaller spool files and better graphics handling produce better experience for typical office workloads.
Both drivers installed — the hybrid approach
Most office MFPs support both PCL 5e and PCL 6 simultaneously. The print driver installation can include both as separate logical printers (e.g., "Office MFP — PCL 6" and "Office MFP — PCL 5e"). Users default to PCL 6 for normal work and switch to PCL 5e only when a specific application produces problems on PCL 6.
The hybrid approach is valuable in mixed-application environments where most users are on modern Office but a subset still runs legacy applications generating PCL 5e output. The dual-driver setup costs nothing operationally beyond the additional installation step and produces compatibility across the full application range.
How to verify which language is being used
Print a configuration page from the MFP's maintenance menu and review the "PDL" or "Page Description Language" line — it shows what the device received for the most recent job. Network admins can also inspect the spool file with a text editor: PCL 5e starts with escape sequences and printable text mixed together; PCL 6 starts with the bytes "HP-PCL XL" followed by binary stream data.
The future of PCL
PCL 6 remains under active development by HP and is supported by virtually all current office MFPs. PCL 5e is in maintenance mode — new devices still support it for compatibility but no new features are added. The expected trajectory: PCL 6 remains the modern default for the foreseeable future, PCL 5e gradually phases out as legacy systems migrate to modern alternatives, and PDF-direct-print (see related article) becomes the increasingly common third option for environments where PCL is not specifically required.