Free online tools
Handy tools that work right in your browser
Unscramble words, solve equations, calculate percentages and dates, convert units, make QR codes and more. No account, no upload: the work happens on your device.
No tool matches that search.
Words & text
Maths, calculators & dates
Percentage calculator
X% of Y, what percent, percentage change, add or subtract a percentage.
Open tool →Equation solver
Linear, quadratic and polynomial equations and systems, with steps. Simplify, expand, factor, d/dx.
Open tool →Tip calculator
Tip, total and split per person, with optional rounding up.
Open tool →Age calculator
Exact age in years, months and days, plus days to your next birthday.
Open tool →Business days calculator
Working days between dates or add N business days. Poland, US, England & Wales holidays.
Open tool →Health
Converters
Unit converter
Length, weight, temperature, volume, speed, area, time and data size, with the factor shown.
Open tool →Time zone converter
Convert a time between cities and time zones, with daylight saving handled.
Open tool →Color picker & converter
Pick a colour, convert HEX ↔ RGB ↔ HSL, check WCAG contrast and get tints.
Open tool →Web, security & images
Password generator
Strong random passwords with a strength meter. Generated on your device.
Open tool →QR code generator
QR codes for links, text, Wi-Fi, email and phone. Download PNG or SVG.
Open tool →JSON formatter & validator
Pretty-print, minify and validate JSON with the error line and column.
Open tool →What is my IP?
Your public IPv4/IPv6 address plus browser, screen and time zone details.
Open tool →Image compressor
Resize and compress JPEG, PNG or WebP on your device. No upload.
Open tool →Private by design
Text, images and numbers are processed in your browser and are not uploaded.
Free, no sign-up
Every tool is free to use. There are no accounts and no usage limits.
Methods explained
Each page shows the formula or data source behind the result, so you can check it.
English and Polish
Every tool is available in both languages, including a Polish word list for the unscrambler.