Classroom tools for teachers
35 free tools and printable tables, with no accounts and no student data. Project a QR code and the whole class opens them in seconds.
No sign-up, no student dataHow to use them in class
- Open the tool or table on the classroom computer.
- Press "Share with your class (QR)" under the title and project it; "Full screen" makes it bigger.
- Students scan it with their phone camera and the page opens: no address to type, no account to create.
- For homework, send the link by WhatsApp from the same button. Reference tables have a print button.
Run the class
- Random Spinning WheelPick who answers next with a spin the whole room can see; remove each winner so nobody repeats.
- Random Name PickerDraw several names at once, or the whole list in a random order for presentations.
- Random Group & Team GeneratorSplit the class into teams of 3, 4 or 5; team sizes never differ by more than one.
- Secret Santa GeneratorThe class gift exchange: private links by WhatsApp or pass-the-phone, no student emails.
- Virtual Rosca de ReyesDía de Reyes in Spanish class: project the rosca and let each student cut a slice to find el niño.
Computer science
- ASCII Table — 0–127, Extended 128–255 and Alt CodesprintablePrintable ASCII table with decimal, binary, hex and Alt codes.
- Text to Binary TranslatorText to binary and back, letter by letter.
- Binary, Octal, Decimal and Hex Conversion Tableprintable0–15 in 4-bit binary and hex, conversions and worked exercises.
- Number Base ConverterConvert between binary, octal, decimal and hexadecimal.
- Two’s Complement CalculatorTwo's complement step by step, from 4 to 64 bits.
- Powers of 2 Table — 2⁰ to 2¹⁰⁰, with Binary and HexprintablePowers of two, printable.
- Byte Converter (KB, MB, GB, TB)Bytes, KB, MB and GB, and why Windows shows a smaller number.
- Truth Table GeneratorTruth tables for any logic expression.
- Morse Code TranslatorMorse code translator, with sound.
Math and statistics
- Mean, Median, Mode & Standard Deviation CalculatorMean, median, mode, variance and standard deviation, with every step shown.
- Frequency Table & Grouped Data CalculatorFrequency tables and grouped data (Sturges, class limits).
- Z-Score Table — Standard Normal DistributionprintablePositive and negative z table, printable.
- Z-Score CalculatorA z-score with its percentile and what it means.
- Percentage CalculatorPercentages three ways: X% of a number, what percent, the whole.
- Percent Error CalculatorLab reports: percent error, with the Excel formula.
- Weighted Average CalculatorWeighted averages, such as a grade from weighted parts.
- Roman Numeral ConverterRoman numerals both ways.
- Number to WordsNumbers written out in words.
- Unit ConverterLength, mass, temperature, area and volume units.
Language and presentations
- Words per Minute — Speech Length TableprintableHow many words a 3- or 5-minute speech needs.
- Speaking Time EstimatorPaste a speech and see how long it takes to read aloud.
- Word CounterWords, characters and reading time of any text.
- Case ConverterUPPER, lower and Title Case in one click.
Time and dates
- Military Time Chart — Printable, with Minutes and Zulu TimeprintableThe 24-hour clock chart, printable.
- Military Time ConverterMilitary time to regular time and back.
- Date Difference CalculatorDays, weeks and months between two dates.
Handing in homework
- JPG to PDF ConverterPhotos of notebook pages into one PDF, straight from the phone.
- Merge PDFSeveral PDFs and photos into one file.
- Compress PDFShrink a PDF under the platform's limit (1 MB, 500 KB).
- QR Code GeneratorA QR code for any link, for the board or a worksheet.
Privacy for schools
The tools run inside the browser: what students type — names on the wheel, their text, their photos and PDFs — is never sent to a server. There are no accounts, no sign-up and no cookies.
The site does count visits anonymously and without cookies, with Cloudflare Web Analytics and Google Analytics in cookieless mode, like many public pages; it never receives what is typed into the tools. The full details are on the privacy page.
FAQ
Do students need an account or an app?
No. Every tool is an ordinary web page: it opens in the browser on a phone or a lab computer and works straight away, with no sign-up and nothing to install.
Does it work on students' phones?
Yes, on Android and iPhone, and on school computers. Once a page has loaded, almost every tool keeps working even if the internet drops.
Can I print the tables?
Yes. The reference tables (ASCII, binary, z table, military time, powers of 2, words per minute) have a Print button that prints just the table, with the page address at the bottom.
Does it cost anything?
No. Every tool is free and asks for no personal data.