Tools
Tools are for quick, practical jobs such as calculation, measurement, or conversion. Everything runs in the browser with no install step.
Each tool page briefly explains inputs and what the result means. Forms are tuned so they are easy to use on phones.
Ad slot (set env to show AdSense)
BMI Calculator
Calculate BMI from height and weight.
Base64 / Hex
Encode and decode text or bytes as Base64 or HEX.
CRC-16
Checksums with MODBUS, CCITT-FALSE, XMODEM presets.
Date & duration
Days between dates or date after N days.
Loan & savings (simple)
Installment savings, deposits, simple interest, and loan payments.
Speed (rough) test
Estimate download Mbps in the browser.
Percent
Ratios, discounts, and percent change.
Character & word count
Count characters, words, and lines in real time.
Unix timestamp
Convert between Unix time and local date/time.
Unit converter
Length, mass, temperature, and volume.
Ad slot (set env to show AdSense)