Redline Pro

Redline Studio · by textportdocx

v1.0.0

Free offline Windows app to compare drawings, schematics, PCB files and PDFs — plus a full PDF editor.

Recommended. Installs both apps with shortcuts.

No install — unzip and run anywhere.

Windows 10 / 11 · 64-bit · No account · No telemetry

REV AREV B

Changelog

v1.0.031 Oct 2026

• Review & Compare — Overlay Rev A and Rev B with opacity, tint and solo controls, a split-curtain slider, and 1px / 0.1px micro-align.
• Auto-Align & Defect Navigator — Sub-pixel auto-alignment, 3-point fiducial snap, and jump between every change with an Open / Approved / Flagged checklist.
• CAD (DXF) Engine — Export PDF drawings to AutoCAD DXF in mm, mils or inches, and open DXF files directly — lines, arcs, circles and text.
• PCB CAM Engine — Read Gerber RS-274X and Excellon drill files. Missing copper in red, added copper in green, 4-mil clearance warnings in amber.
• Measure & Markup — Calibrate scale, measure distance, polyline and area, count parts, and mark up with clouds, arrows, callouts and stamps.
• Export & Share — Save PDF with diffs, high-res images, DXF, an executive audit report, or a .redline session to continue later.

Open source

All code is public on GitHub — read it or build it yourself.

Scan it

Upload the file to VirusTotal or any antivirus before running.

SmartScreen notice

New unsigned apps may show a warning. Choose “More info” → “Run anyway”.

PanSpace + Drag

ZoomMouse wheel

Fit to screenF

Lower / raise diff threshold[ / ]

Next changeN / F3

Previous changeP / Shift+F3

Toggle sidebarCtrl + B