OpenConverter

QR code generator

• Added a QR code generator for URLs and plain text, Wi-Fi networks, and contact cards (vCard).
• Every code is static, generated entirely in your browser: nothing is uploaded and no scans are tracked.
• Download your code as PNG for quick sharing or SVG for print at any size.

Unit converter

• Added a Volume converter covering metric, US and imperial measures, from millilitres to gallons. It also explains why a US gallon and a British gallon are not the same size.
• Added a Mass converter from micrograms to tonnes, including the troy ounce used for precious metals and the carat used for gemstones.
• Added Temperature and Power converters that show every step of the calculation, not just the answer.
• Conversions now show a shorter, one step working whenever a familiar constant links the two units, for example 1 inch = 2.54 cm, instead of always passing through the base unit.
• Every conversion now has a Good to know panel with the history and the sources behind each unit.
• The step by step working now reads like real scientific notation: numbers are shown to a sensible precision, very large or very small values switch to powers of ten (like 1 × 10⁹), and the decimals control now only rounds the final answer while every step keeps its full precision.

Accuracy and trust

• Added an automatic check that compares every conversion against known reference values before it goes live, so a wrong number cannot slip through unnoticed.
• Added a short note under each result asking you to confirm anything important against another source, because a unit slip can have real consequences.