Free PCB Design Tools

80+ free online calculators, converters, and reference tools for electronics engineers. No signup required.

Browse All Tools

Resistor Color Code Calculator

Decode 4, 5, or 6 band resistor colors instantly. The most popular tool for electronics engineers.

Popular Tools

Most used tools by electronics engineers

View All

Gerber Viewer

Preview PCB files online

Trace Width Calculator

IPC-2221 current capacity

Capacitor Code

Decode 104, 473, etc.

Number Base Converter

Hex, binary, decimal

Unit Converter

Mil, mm, inch, μm

Impedance Calculator

Microstrip & stripline

View All Tools

Browse by Category

Find the right tool for your PCB design and electronics work

Calculators

25+

Trace width, impedance, via current, voltage drop calculators

Converters

10+

Unit, resistor color, capacitor code, number base converters

File Viewers

Gerber viewer, BOM viewer, pick & place file preview

Reference

15+

SMD codes, surface finish guide, PCB glossary, EDA comparison

Electronics Knowledge Base

Tutorials, guides, and tips for PCB design and electronics

View All Articles

PCB Manufacturing2026-04-22

IATF 16949 Compliance in PCB Manufacturing: What Automotive Buyers Should Actually Audit

IATF 16949 in PCB manufacturing is not a logo exercise. It changes traceability, change control, risk management, supplier discipline, and production evidence from quotation through shipment.

By Hommer Zhao

PCB Manufacturing2026-04-22

PCB Solutions for Agricultural Robotics: Designing for Dust, Vibration, Moisture, and Serviceability

Agricultural robotics PCB success depends on contamination control, power integrity, rugged interconnects, and production-ready validation rather than generic industrial board rules.

By Hommer Zhao

PCB Assembly2026-04-22

PCB Assembly for Medical Ultrasound Equipment: What Actually Drives Yield, Noise, and Traceability

Ultrasound PCB assembly fails when low-noise analog, high-voltage pulse paths, fine-pitch digital devices, and medical traceability are handled like ordinary industrial boards.

By Hommer Zhao

Cable Assembly2026-04-21

Buy America BABA Compliance in Cable Manufacturing

Cable makers win or lose BABA work on classification, U.S. manufacturing steps, and traceable supplier records, not patriotic packaging.

By Hommer Zhao

Cable Assembly2026-04-21

EV Charging and Energy Storage Wiring Solutions: Cable Assemblies, Harness Design, and Safety Requirements

EV charging and energy storage wiring solutions are not just about ampacity. The right cable assembly, harness routing, connector strategy, shielding, and test plan determine whether a charger, battery cabinet, or inverter build survives heat, vibration, flexing, and field service without nuisance failures.

By Hommer Zhao

Cable Assembly2026-04-21

Network Cable Color Code: T568A, T568B, Crossover, and Rollover Pinouts Explained

Network cable color code is not just a memorization problem. The conductor order you choose affects pair integrity, retermination speed, PoE safety checks, field troubleshooting, and whether a custom Ethernet harness matches T568A, T568B, crossover, or rollover expectations.

By Hommer Zhao

Can't find the tool you need?

We're constantly adding new tools. Let us know what you'd like to see.

Request a Tool