A grimoire of useful tools

Small spells for everyday work

The Magic Codex is a growing book of free, fast online tools — built by one independent developer. No sign-up, no clutter, no tracking. New pages are inscribed regularly.

Cite a source Calculate GPA

Open the codex

Every tool is free and works right in your browser.

For students

Study tools, calculators, and reading — homework helpers that live in your browser.

Live

Citation Generator

Accurate citations in APA 7th, MLA 9th, Chicago, and Harvard. Websites, books, journals, YouTube — with URL, DOI, and ISBN auto-lookup.

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GPA Calculator

Semester and cumulative GPA with weighted scales, plus a planner that tells you exactly what you need to hit your target.

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Word Counter

Count words and estimate reading time instantly.

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Grade Calculator

“What do I need on my final?” — answered.

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Pomodoro Timer

Focus sessions with clean, simple timing.

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Scientific Calculator

Trig, logs, powers, factorials — full keypad.

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Typing Speed Test

Measure your words per minute and accuracy.

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Student Budget Calculator

Plan spending on a student budget.

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Flashcard Maker

Spaced-repetition flashcards for any subject.

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Timetable Maker

Build your weekly class schedule.

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Story Time Read-Aloud

Over 1,000 public-domain children's stories read aloud for the classroom.

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Text-to-Speech Reader

Hear your essay read aloud for proofreading.

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Periodic Table

Interactive table of all 118 elements.

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Fraction Calculator

Add, subtract, multiply and divide fractions with steps.

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Quadratic Solver

Solve ax²+bx+c=0 — roots, vertex, and steps shown.

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Statistics Calculator

Mean, median, mode, standard deviation, and more.

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For teachers & parents

Classroom helpers — pickers, planners, and printable makers.

Live

Random Student Picker

Fair, no-repeat classroom picker for teachers.

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Attendance Calculator

How many classes can you miss and still pass?

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Math Worksheet Generator

Printable arithmetic worksheets with answer keys.

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Seating Chart Maker

Arrange your class into a printable seating grid.

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Rubric Maker

Grading rubric matrices with auto totals and percentages.

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Random Group Generator

Split a list of names into balanced random groups.

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Spelling Quiz

Hear the word, type the spelling, track your score.

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Report Card Comments

Polished report-card comments by subject, trait, and level.

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Bingo Card Generator

Printable randomized bingo cards from your own word lists.

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Word Search Generator

Custom word-search puzzles from any vocabulary list, printable.

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Lesson Plan Builder

Structured lesson plans with timed activities, printable.

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Quiz Maker

Build multiple-choice quizzes, take them on screen, instant scoring.

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Gradebook

Weighted gradebook with roster, categories, and class stats.

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Chore Chart Maker

Printable weekly chore charts for kids.

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Certificate Maker

Printable student award certificates.

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Everyday utilities

Quick answers for daily life — money, dates, files, and handy converters.

Live

Percentage Calculator

Percent of, percent change, increase/decrease.

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Unit Converter

Length, weight, temperature, and more.

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Tip Calculator

Split the bill fairly in seconds.

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Password Generator

Strong, random passwords on demand.

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Case Converter

UPPER, lower, Title Case and more.

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Countdown Timer

Count down to exams, deadlines, events.

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Resume Builder

Clean templates, export to PDF.

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PDF Tools

Merge and compress PDFs for submissions.

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Age Calculator

How old are you, exactly? Years, months, days.

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Date Calculator

Days between dates, plus date arithmetic.

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BMI Calculator

Body mass index with healthy-range guidance.

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Loan Calculator

Monthly payments, interest, amortization table.

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Compound Interest Calculator

Project savings growth with contributions.

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QR Code Generator

Free QR codes for URLs and text. PNG download.

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Time Zone Converter

Convert times across zones; plan meetings.

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Random Number Generator

Random numbers, dice, coin flip, shuffler.

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Stopwatch

Precision stopwatch with lap times.

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Fancy Text Generator

Bold, italic, script and 12 more unicode styles.

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Invoice Generator

Professional invoices with tax, discounts, print.

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Metronome

Steady beats with tap tempo, 30-240 BPM.

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Full-Page Image Printer

Print images full-page, straight from your browser.

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Image Compressor

Shrink image files in your browser — nothing uploaded.

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For developers

Text, code, and data tools for people who build things.

Live

JSON Formatter

Validate, format, and minify JSON.

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Lorem Ipsum Generator

Placeholder text by paragraph or word.

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Color Picker

Hex/RGB/HSL converter, palettes, contrast checker.

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Base64 Encoder

Encode and decode Base64, URL-safe too.

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URL Encoder / Decoder

Encode/decode URLs and parse query strings.

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Unix Timestamp Converter

Convert timestamps to dates and back.

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Text Diff Checker

Compare two texts with line and word-level highlights.

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Markdown Previewer

Write markdown, see live HTML preview instantly.

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Regex Tester

Test regular expressions with highlighted matches.

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JWT Decoder

Decode JWT headers and payloads instantly.

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Cron Explainer

Cron expressions translated to plain English.

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UUID Generator

Bulk UUID v4 generation with one click.

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Hash Generator

SHA-256/384/512 and MD5 digests of any text.

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HTML Entity Codec

Encode text to HTML entities and decode them back.

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JSON to CSV

Convert JSON arrays to clean CSV with proper escaping.

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Meta Tag Generator

SEO and social meta tags with live preview.

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CSS Minifier

Shrink CSS with before/after byte counts.

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Why the codex

Free, really

No accounts, no paywalls on the basics, no “free trial” tricks. The tools are the product, not you.

Private by design

Everything runs in your browser. Your courses, grades, and bibliographies never leave your device.

Fast and focused

One page, one job. No dashboards, no clutter — open the tool, get the answer, get back to work.

Questions, answered

Is The Magic Codex really free?
Yes. Every tool is free to use with no sign-up. The project is kept alive by voluntary donations.
Do I need an account?
No. There are no accounts at all — open a tool and use it.
Is my data sent anywhere?
No. Tools like the GPA calculator store your entries only in your own browser. Nothing is uploaded or tracked.
What tools are coming next?
Grade calculator, pomodoro timer, percentage calculator, unit converter, random student picker, scientific calculator, and more from the codex.
Who makes The Magic Codex?
One independent developer. If a tool saves you time, the donate link keeps new pages coming.