Digital & design
Work with images, text, data and networks.
Browse categories · Digital & design
Digital & design
Work with images, text, data and networks.
Design & media
- Aspect ratio calculator
Resize proportionally and calculate print dimensions at a chosen DPI.
- Color calculator
Convert HEX to RGB/HSL, mix encoded sRGB colors and check contrast.
- Download time calculator
Estimate transfer time from file size, speed and usable throughput.
- Reading & speaking time
Count words and estimate delivery time at your chosen rate.
Networks & utilities
- IPv4 subnet calculator
Find network, broadcast and usable addresses from CIDR notation.
- Password generator
Generate passwords locally with cryptographic random selection.
- Number base converter
Convert signed integers between binary, decimal and hexadecimal.
- IBAN validator
Check supported country formats and MOD-97 without sending account details.
Useful results. Visible working.
Each calculator includes an example and explains its assumptions. Calculations run in your browser, and you choose what to save.