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.

Live

Citation Generator

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

Open tool → Live

GPA Calculator

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

Open tool → Live

Word Counter

Count words and estimate reading time instantly.

Open tool →
Coming soon

Grade Calculator

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

Coming soon

Pomodoro Timer

Focus sessions with clean, simple timing.

Coming soon

Percentage Calculator

Quick percentages, increases, and discounts.

Coming soon

Unit Converter

Length, weight, temperature, and more.

Coming soon

Random Student Picker

Fair, no-repeat classroom picker for teachers.

Coming soon

Scientific Calculator

Full scientific functions, clean layout.

Coming soon

Tip Calculator

Split the bill fairly in seconds.

Coming soon

Password Generator

Strong, random passwords on demand.

Coming soon

Case Converter

UPPER, lower, Title Case and more.

Coming soon

Countdown Timer

Count down to exams, deadlines, events.

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.