HPGL Viewer
QuickLook for plotter files
Only for Mac
$8.99
Mac
See every line before you plot. Bring your .hpgl files to life with stunning visual precision—right on your Mac.
No bloat, no subscriptions, but with Finder integration!
If you work with vintage pen plotters—whether an HP 7550, Roland DG, or any classic device—you know the pain: send a file to your machine and hope for the best. What if there's a stray command? A closed path gone wrong? A missing pen instruction?
The HPGL Viewer eliminates guesswork. It renders your HPGL-1 drawings quickly and exactly as your plotter sees them, lets you inspect every detail, and gives you the confidence to hit "send" knowing your artwork will turn out the way you intend.
This is a native macOS only viewer for HPGL plotter files (.hpgl, .hpg, .plt) with Finder integration.
** Features **
23 commonly used HPGL-1 commands are parsed — AA, AR, CI, DF, EA, EP, ER, FP, FS, IN, IP, LB, PA, PD, PM, PR, PU, RA, RO, RR, SP, VS and WG.
Fills — FP polygon fill rendering with 50% opacity.
Hershey text — LB labels rendered with Core Text.
Pan & Zoom — scroll wheel zooms (center-based), click-drag pans.
Page layout — detects the largest axis-aligned rectangle in HPGL data for a paper-like backdrop with shadow. (Pro-tip: Use a separate layer in your SVG for pen99 with a page-sized rect to have a consistent page layout).
Per-pen layers — separate colors for pens 1–10, toggle visibility.
Validation — parser-level diagnostics shown in the Info Panel: unrecognized commands (info), ignored plotter-output instructions (warning), etc.
Statistics — per-pen stats: pen-down/up distance, strokes, polygon perimeter/strokes, pen changes, estimated ink usage plus a complexity score.
And last but not least: QuickLook — Spacebar preview in Finder for .hpgl files!
Another Pro-tip: Use the CLI app in combination with vpype for quick workflow: .svg -> .hpgl -> HPGL Viewer (with stats)
Visit https://penplot.studio and https://plotopia.art for more information about pen plotters and HPGL artworks.
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The developer, Touchinski, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
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The developer does not collect any data from this app.
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Information
- Seller
- Touchinski
- Size
- 1.6 MB
- Category
- Graphics & Design
- Compatibility
Requires macOS 13.0 or later.
- Mac
Requires macOS 13.0 or later.
- Mac
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Touchinski
