01Decide
Wheel Picker
Spin a customizable wheel to pick names, options or everyday decisions.
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How to Use a Wheel Picker for Fair Random ChoicesSikelia Tools · GuidesSmall tools.
Small tools.
Big everyday wins.
See the real app first. Learn the quickest way to use it. Get the result and move on.
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01 / 05DecideSpin it.
Spin it.
Pick it.
Move on.
Spin a customizable wheel to pick names, options or everyday decisions.
Open Wheel PickerGuides for this toolHow to Use a Wheel Picker for Fair Random Choices
02Images
Image Compressor
Make JPEG, PNG and WebP files lighter while keeping the result useful.
Try Image Compressor
03Sleep & time
Sleep Calculator
Estimate practical bedtime and wake-up windows without treating sleep like an exact stopwatch.
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Sleep Calculator Guide: Sleep Cycles, Bedtime and Wake-Up Times
04Data
CSV / JSON / YAML Converter
Convert CSV, JSON and YAML locally in your browser.
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How to Convert CSV to JSON Without Breaking Headers or Data
05Groups
Random Team Generator
Split a list of names into fair, evenly sized random teams.
Try Random Team GeneratorLearn with this tool
How to Split a List into Random Teams FairlyEveryday guidesStart with the problem,
Start with the problem,
not the feature.
Short, practical guides written for people using the tools — not for people building them.
How to calculate age in years, months and days
Learn how calendar age calculations work, why total days differ from years and months, and how to check your next birthday with an online age calculator.
Read guideDate Duration Calculator: Days Between Dates and Weekdays
Calculate calendar days and weekdays between two dates, choose whether to include the last day, and add or subtract days using the Sikelia Tools calculator.
Read guideJSON Formatter Online: Validate, Pretty Print and Minify
Learn to validate, format and minify JSON online with real examples, indentation options and clear syntax-error checks using Sikelia Tools in your browser.
Read guideHow Cron Expressions Work: 5 Fields, Examples and Common Mistakes
Learn how to read a five-field cron expression, understand each field, check common schedules and avoid field-count or time-zone mistakes before using a cron job.
Read guideHow to Send an Encrypted One-Time Note Safely
Create a one-time private note, set its expiry, send its encrypted link and understand what happens when the recipient reveals it. No account required.
Read guideHow to Use Online Alarm Clock Online: A Practical Guide
Use Online Alarm Clock for a clear everyday task: set a browser alarm for a specific time when the device will remain powered on and audible. This guide covers setup, checks, useful habits and the limits...
Read guideD20 Dice Roller Guide: Roll D4, D6, D8, D10, D12 & D20
Use an online D20 dice roller for D4, D6, D8, D10, D12 and D20 rolls. Learn how dice counts work, what common notation means and how the browser-based roller works.
Read guideHow to Use Online Stopwatch Online: A Practical Guide
Use Online Stopwatch for a clear everyday task: measure elapsed time, laps and intervals directly in the browser. This guide covers setup, checks, useful habits and the limits worth knowing before you rely...
Read guideHow to Use Online Timer Online: A Practical Guide
Use Online Timer for a clear everyday task: run a countdown for cooking, study sessions, breaks, presentations or short focus blocks. This guide covers setup, checks, useful habits and the limits worth...
Read guideHow to Use Unit Converter Online: A Practical Guide
Use Unit Converter for a clear everyday task: convert length, mass, temperature, data and other supported units locally without uploading the values. This guide covers setup, checks, useful habits and the...
Read guideHow to Use World Clock Online: A Practical Guide
Use World Clock for a clear everyday task: compare the current time across cities and time zones before calls, travel or messages. This guide covers setup, checks, useful habits and the limits worth knowing...
Read guideYes or No Wheel: A Fast 50/50 Random Decision Guide
Use a Yes or No Wheel — also called a yes no wheel — for a quick 50/50 random answer when either option is acceptable. Learn how the result is chosen and when to use it.
Read guideHow to Compress Images Without Uploading Them to a Server
Reduce image size directly in your browser when you want a smaller copy without sending the original photo to an image-processing service first.
Read guideHow to Convert CSV to JSON Without Breaking Headers or Data
Convert CSV to JSON with a practical workflow for headers, quoted fields, leading zeroes and type-sensitive values, then verify the result before saving it.
Read guideHow to Use a Wheel Picker for Fair Random Choices
Use a random wheel for names, tasks or everyday decisions with a simple setup that keeps choices clear, avoids duplicates and makes each spin easy to trust.
Read guideHow to Compress an Image for Email Without Ruining Quality
Make photos and screenshots smaller for email with a simple resize-and-compress workflow that keeps text readable and important details looking clear.
Read guideHow to Split a List into Random Teams Fairly
Turn a list of names into balanced random groups by choosing team size or team count first, removing duplicates and keeping the rules simple.
Read guideRandom Word Generator: Writing Prompts, Vocabulary and Games
Use random words for writing prompts, vocabulary practice, naming exercises and quick games, with language, length and letter filters when you need a useful starting point.
Read guideSleep Calculator Guide: Sleep Cycles, Bedtime and Wake-Up Times
Use a sleep calculator and sleep cycle calculator for bedtime and wake-up planning, with clear limits around 90-minute cycles, REM estimates and nap timing.
Read guide