allDecoder
Decode engineering markings into readable segments.
Use focused tools for resistor color bands, cable markings, and bearing numbers. Each decoder shows the recognized parts of the marking, confidence notes, and source limits so the result stays tied to the visible evidence.
Featured decoders
Electronics
Resistor Color Code Calculator
Decode 3, 4, 5, and 6 band resistor colors, or reverse an ohm value into color bands.
Brown Black Red Gold · 4.7k
Electrical
Read supported cable markings, conductor counts, ground notation, voltage family, and size segments.
H07RN-F 3G2.5 · THHN 12 AWG
Mechanical
Parse common rolling bearing designations, bore codes, seal and shield suffixes, clearance suffixes, and manufacturer-specific boundaries.
6204-2RS-C3 · NU205ECP
Decoder areas
Browse by decoder area
Pick a family to see every decoder inside it.
Resistor bands, SMD codes, capacitor markings, and small-component top marks.
Cable jackets, breaker and RCD markings, IP ratings, and lamp base codes.
Bearing designations, thread callouts, bolt grades, tyre codes, and welding rods.
Learn
Read the guides
Guides explain how to enter complete markings, what each result field means, and where the decoder stops. They are written as family-specific references, not cloned templates.
Band roles, tolerance rules, and reverse lookup walkthroughs.
Conductor counts, ground notation, and voltage families.
Bore codes, seals, clearance suffixes, and catalog limits.
Trust
Source and limits
allDecoder is a marking aid, not a manufacturer catalog, safety approval, or procurement decision. Use the decoded result to organize visible evidence, then confirm specifications with the governing standard, product label, manufacturer data sheet, and local requirements.