Tools
Open one and use it right away — no install, no account.
Character counter
Characters, bytes and lines at once
Open →Korean age calculator
All three ways Korea counts age
Open →D-day counter
Days left until a date
Open →dp ↔ px converter
Both directions, mdpi to xxxhdpi
Open →Monitor size calculator
Inches to cm, and how wide side by side
Open →Daily Stamp
Mark what you do each day and see it on a calendar
Open →What these are
Each screen does one calculation. Type a value and the answer is already there — there is no calculate button to press. When you are done, close it.
Everything is computed inside this browser. What you type is not sent anywhere, and only the tools that need to remember something keep it on this device.