Digital life
This code is not a secret
A string of random-looking letters can be a disguise, not a lock. Decode a harmless example, then learn what “URL-safe” actually promises.
Read the story → PiPi’s field notes
Try the toolsDigital life
The meeting starts in 17 minutes. Your timer says 25.
One small example
With a 2-minute setup buffer and no break, a 15-minute block fits a 17-minute gap. Try your own numbers.
A planning example, not an optimal focus length or a reliable meeting alarm.
Sources, check dates and limits are in the story.
A small question worth following
Read the story → Money & everyday life
The second item is half off. Your cart is not.
“Buy one, get one 50% off” sounds huge until you total the pair. Try a fictional two-item cart and compare the discount with what you planned to spend.
Read the story → Read · Try
One question leads to another
A quick answer is the beginning. Open the guide for its examples and boundaries, or try the matching tool yourself.
Paycheck · United States
Why is your paycheck smaller than your salary?
Your deposit can reflect federal withholding, Social Security and Medicare, state or local taxes, and benefit deductions—not just your stated salary.
Our 2026 U.S. calculator models annual federal tax, FICA and an entered state rate. It does not predict your employer's pay stub or benefits.
Digital life · Unicode
Why does btoa() fail on emoji?
It accepts one-byte characters, not arbitrary Unicode. Convert text to UTF-8 bytes before Base64 encoding; the encoding itself is not encryption.
Writing · Character counts
Can one count approve an X post, SMS, or Google snippet?
No. X weights characters and links, SMS depends on encoding and segments, and Google has no fixed snippet length. A raw count is only a starting point.
Language · Japanese
Is there an official JLPT N5 word list?
The organizers do not publish an itemized list. Our 12-card web sample helps you practice readings and short phrases; it is not an exam syllabus.
Try it here
Open a web tool when you need it. These web activities need no signup or app.
Focus
Set a work block and a break. Start a timer here; alerts on a locked screen are not assured.
Open the timerWords
Try 12 sample Japanese words with cards and a quiz. This is not an official JLPT word list.
Open cards and quizPrint and play
Free resources you can use on their own. Each page explains its scope and how it was made.
Color
Choose from 12 animal pages as A4 or US Letter PDFs, or PNGs—no upload, signup or app. Made from AI-generated sample photos; see the source images and creation notes.
Open coloring pagesRole-play
Practice asking for help in Korean. A free 10-page Korean–English home activity pack. No app required.
Open the guideWord links
Already read Hangul? Try three small Korean word-link examples with English help. Separate from the mobile game.
Try the three examplesTools
Calculators, dates and text utilities. Choose the tool you need from one catalog.
One question, different local context.
The same topic can depend on local rules and the assumptions behind a tool. PiPi Worlds offers calculators, guides, and reading material in Korean, Japanese, and English. Topics and examples can differ by language; check each article's sources and scope before using it.
Why we built this
A pregnancy-week estimate depends on its starting date, while age terms depend on local context. An article written for another country may not answer your question. We want readers to inspect a tool's assumptions and follow relevant source links, rather than rely on an answer borrowed without context.
How it gets made
We aim to show sources and explain calculation assumptions where relevant. Links and automated checks do not guarantee accuracy, and not every guide has had separate human or specialist fact review. For consequential decisions, check current primary guidance. Please send us the page URL if you find an error.
Operating principles
Calculators and converters generally run in your browser. Shared schedules use server storage; we also use a language cookie, usage events and app link counts. Read our privacy policy for details about each feature.
/privacy_first
How we use data.
Calculations run in your browser; shared schedules use server storage. We explain what is stored and for how long.
Local-first
Age, percentage and text calculations run in your browser. Values in shared URLs can be seen by others.
No accounts
No account is required to use the tools. You can use a nickname for shared schedules.
Open & honest
Cited sources, clear assumptions, and no hidden upsells.