Online Gerber Viewer vs KiCad Gerber Preview
Online Gerber Viewer vs KiCad Gerber Preview: Which Should You Use?
KiCad ships with a built-in Gerber viewer (part of the PCB editor, plus the standalone gerbview tool). Many designers never consider an alternative. But there are real scenarios where a lightweight browser-based viewer is the better tool for the job.
Short answer: Use KiCad's Gerber preview when you're already in KiCad and need deep interaction with the design (cross-probing to the PCB, DRC integration). Use Online Gerber Viewer when you need a fast, portable, zero-install check of Gerber files — especially ones produced by other tools, or when you're not at your KiCad machine.
Head-to-Head
| Aspect | Online Gerber Viewer | KiCad Gerber Preview (gerbview) |
|---|---|---|
| Installation | ❌ None — any browser | ✅ Requires KiCad install (hundreds of MB) |
| Platform | ✅ Windows/Mac/Linux/ChromeOS/mobile | ⚠️ Windows/Linux/Mac desktop |
| File upload | ❌ None — fully local | ✅ Local (desktop app) |
| Load speed | ✅ Instant — single HTML | ⚠️ Depends on KiCad startup |
| Multi-CAD layer detection | ✅ 19 CAD tools (KiCad, Altium, Eagle, OrCAD…) | ⚠️ KiCad-centric naming |
| Measurement tools | ✅ Distance, angle, dx/dy, continuous mode | ✅ Basic measurement |
| Grid overlay | ✅ 4 styles, adjustable origin | ✅ Grid options |
| Per-layer opacity | ✅ Full control | ⚠️ Limited |
| Color customization | ✅ 28 presets + eyedropper | ✅ Layer color settings |
| Export | ✅ PNG (custom size) + SVG (per-layer ZIP) | ⚠️ Screenshot only |
| Cross-probe to PCB editor | ❌ | ✅ (KiCad only) |
| ZIP batch import | ✅ Auto-extract | ⚠️ Manual |
| Mobile access | ✅ | ❌ |
| Free | ✅ | ✅ Open source |
The Key Advantage of KiCad's Preview
KiCad's gerbview is battle-tested — it's the reference implementation many designers trust for final verification. It also integrates with the KiCad ecosystem:
- Cross-probing between Gerber view and the PCB editor
- DRC-style checks via the design workflow
- Consistent rendering with the EDA tool that generated the files
If you designed the board in KiCad and are verifying your own output, KiCad's preview is a solid choice — with one caveat: you're checking your own work with the same tool that exported it. Export bugs (e.g., teardrops not enabled, wrong layer mapping) can slip through because both sides share assumptions.
Why Designers Add Online Gerber Viewer
- You received files from someone else — a fab's engineering confirmation, a colleague's Altium output, a supplier's ZIP. KiCad's viewer handles foreign naming conventions poorly; Online Gerber Viewer's majority-vote algorithm identifies Altium, Eagle, OrCAD, Allegro, gEDA, DipTrace and more automatically.
- You're not at your workstation — on a laptop, phone, or shared machine, a single HTML file is all you need.
- You want a second opinion — viewing the same Gerber in an independent renderer catches issues that a self-check misses. The parser here is ported from tracespace v5, a completely independent open-source implementation.
- You need measurement precision — mil/mm toggle, continuous multi-segment measurement, angle readout, and grid alignment verification are first-class features.
Verdict
| Scenario | Better Choice |
|---|---|
| Designing in KiCad, final self-check of your own export | KiCad Gerber Preview |
| Reviewing files from any CAD tool (Altium, Eagle, OrCAD…) | Online Gerber Viewer |
| Quick check on mobile / laptop / shared computer | Online Gerber Viewer |
| Cross-probing to KiCad PCB editor | KiCad Gerber Preview |
| Privacy-sensitive designs (zero upload, zero traces) | Online Gerber Viewer |
| Deep DRC / fabrication analysis | Neither — use a CAM tool (or fab's service) |
Bottom line: These tools complement each other. KiCad's built-in preview is unbeatable for KiCad-integrated workflows. Online Gerber Viewer is the better choice for anything involving files from other tools, quick checks away from your workstation, or independent verification — and it costs nothing to have both bookmarked.