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Local-first utilities with clear output and no unnecessary account wall.
Unit converter
Convert any pair across length, mass, temperature, data, energy and more.
Open tool ↗PNG compressor
Reduce PNG files locally in your browser. Nothing is uploaded.
Open tool ↗JWT decoder
Inspect claims and token structure without sending the token anywhere.
Open tool ↗Image color picker
Pick HEX, RGB, HSL and CMYK values from an image in your browser.
Open tool ↗Unit conversion by category
Browse a complete topic cluster instead of starting from a single pair.
LengthDistance, height, width — anything that measures how long something is. SI base unit: the metre (m).Explore category ↗MassHow much matter is in something. Differs from weight (which is force). SI base: kilogram (kg).Explore category ↗TemperatureHow hot or cold something is. Conversions are affine — there is an offset, not just a multiplier.Explore category ↗AreaSize of a 2-D surface. SI base: square metre (m²).Explore category ↗VolumeSpace occupied by a 3-D object. SI base: litre (L) for everyday use; cubic metre (m³) for SI.Explore category ↗SpeedDistance per unit time. SI: metre per second (m/s).Explore category ↗TimeDuration. SI base: the second (s).Explore category ↗DataDigital information size. SI: the byte (B). Note the difference between decimal (KB=1000) and binary (KiB=1024) prefixes.Explore category ↗EnergyCapacity to do work. SI base: joule (J). Also commonly expressed as calories, kWh, BTU.Explore category ↗PressureForce per unit area. SI base: pascal (Pa).Explore category ↗AngleRotation or turning. SI base: radian (rad).Explore category ↗Fuel EconomyDistance per unit of fuel, or its reciprocal (fuel per distance). Base: litres per 100 km.Explore category ↗