Free Tools and Tips
Free Tools and Tips
These pages are small utilities that run in your browser and short guides that sit next to them. You enter a time, a pair of dates, a list, or a color, read one concrete tip, and leave with a result you can copy.
Nothing here is uploaded. The password generator builds a string on this device and does not keep it after you leave.
Try a time zone conversion
This browser cannot read IANA time zones. Open the page in a current browser to convert clocks.
Same moment in the second zone
Enter a date to convert.
On this device
This browser still has a job you started. Nothing here was uploaded.
Tools
Time Zone Converter
Turn a date and time in one IANA zone into the clock in another zone, with the hour gap on that date.
Meeting Planner
Place one meeting on three IANA clocks. The axis is one UTC day; the gold mark is that instant.
Countdown
Watch days, hours, minutes, and seconds until a date on this device. A past date shows how long ago it was.
Date Difference Calculator
Subtract a start date from an end date. Blank times mean midnight, so January 1 to February 1 is 31 days.
Unit Converter
Convert length, weight, temperature, and US volume. Inches, Fahrenheit, pounds, and the US gallon are the default starting units.
Random Picker
Give each non-empty line an equal chance, then pick one. The last five picks stay only in this tab.
Password Generator
Build a random string locally from the sets you turn on. The page does not remember the result.
Aspect Ratio Calculator
Keep height ÷ width when you change one side. A 1920 × 1080 frame at width 1280 becomes 720 tall.
Hex to RGB
Switch #RRGGBB and rgb(r, g, b), with a color preview next to the numbers.
Tips
Read a time-zone result when clocks change
Why the hour gap can stay put while the UTC offset moves.
Count days between two dates
Midnight-to-midnight days, and what changes when you add times.
US customary and metric on this site
The US gallon is not the imperial gallon, and the switch is labeled.
Make a fair random list
One idea per line, and why blank lines do not get a chance.
Choose a password length
Entropy as length × log2(alphabet), not a gut score.
Keep an aspect ratio when you resize
New height equals new width times height divided by width, with a lock you can turn off.
Plan a call across three zones
One instant on three clocks, and why a third city is not a second 9:00 a.m.
Read a countdown
Target minus this device’s clock, and when to convert the event first.
Hex versus RGB
#ff0000 is rgb(255, 0, 0). Six digits, or three integers from 0 through 255.
About
Free Tools and Tips is a small set of utilities and guides for everyday questions: what time it is there, how many days sit between two dates, and how a color or a frame size is written. The site is new. Each tool keeps its math in the page you are looking at.
Questions people ask before they convert
Does daylight saving change the New York to Los Angeles gap?
Usually not. Both places shift on the same weekend, so the gap stays three hours in winter and in summer. The converter still reads each IANA zone for the date you enter, because other pairs do not move together.
Which gallon does the unit converter use?
The volume tab uses the US gallon of 231 cubic inches, which is 3.785411784 liters. That is not the imperial gallon. The metric switch starts you on liters; it does not change the US gallon factor.
Does the password leave this browser?
The generator builds the string with crypto.getRandomValues in this page. The site does not send the password and does not store it after you leave or refresh.
How does Fahrenheit convert to Celsius?
Celsius = (Fahrenheit − 32) × 5/9. In the other direction, Fahrenheit = Celsius × 9/5 + 32. That is why 32 °F is 0 °C.
Is every line in the picker equally likely?
Yes. After blank lines are dropped, each remaining line has the same chance. The picker draws a uniform index and rejects random numbers that would bias the last few slots.
How are days between dates counted?
The calculator subtracts the start moment from the end moment. With both times left blank, both moments are midnight, so January 1, 2026, to February 1, 2026, is 31 days. A later start produces a negative number.
What does the metric switch change?
It changes which unit is selected first. US customary is the default: inch, pound, Fahrenheit, and the US gallon. Metric selects centimeter, kilogram, Celsius, and liter. Both directions stay available either way.
How do I put one meeting on three clocks?
Open the Meeting Planner. Type the wall clock in the first zone, then add two more IANA names. The three labels are the same instant, not three separate start times.
Does the countdown use New York time?
No. The countdown subtracts this device’s clock from the date you type. Convert a New York clock first if the event is not local, then paste that local date and time.