Common Unit workflows
Decimal storage units use powers of 1000 and binary units powers of 1024. CSS percentages and relative lengths require a reference size; there is no universal percentage-to-pixel conversion.
Choose a tool for your input
Decimal storage units use powers of 1000 and binary units powers of 1024. CSS percentages and relative lengths require a reference size; there is no universal percentage-to-pixel conversion.
- CSS Unit Converter — Convert px, rem, em, points, inches and percentages using explicit reference sizes.
- Bytes Converter — Convert storage sizes between decimal SI units and binary IEC units with exact arithmetic.
- Duration Converter — Convert ISO durations and fixed time units to nanoseconds.
- PX to REM Converter — Convert px to rem, including whole stylesheets.
Review the result before using it
Each tool explains its accepted input, supported options and limits. Keep the original and verify important output in the application that will consume it.
Frequently asked questions
How do I choose a Unit tool?
Decimal storage units use powers of 1000 and binary units powers of 1024. CSS percentages and relative lengths require a reference size; there is no universal percentage-to-pixel conversion.
Can the same tool appear in more than one topic?
Yes. Tools are listed by supported formats and tasks as well as their main category. Each tool has one page and processing runs locally; explicit API clients connect only to endpoints you choose.
Tools process your input on this device. Read the privacy policy, or save the tool library for offline use.