Free online tools
Six private utilities that run in your browser. Calculators, pickers, and a word counter — no signup, nothing uploaded.
FreeNo signupPrivate
Calculators
Percentage Calculator
X% of Y, percent change, discounts and VAT.
Calculators
Age Calculator
Exact age, age on a date, days between dates.
Calculators
BMI Calculator
Adult body mass index in metric or US units.
Generators & Pickers
Random Number Generator
Numbers in any range, no repeats, dice, coin, list shuffle.
Generators & Pickers
Spin the Wheel
Random name and decision picker wheel.
Writing
Word Counter
Words, characters, reading time, keyword density.
In short
What these tools are
PurePDF’s free online tools are everyday calculators, random pickers, and a word counter that run entirely in your browser. Nothing you type is uploaded or stored, there is no signup, and each page explains its method, so you can check every result.
These utilities sit alongside the PurePDF document tools. Each one does a single job well: the answer appears as you type, the formula or method is shown beneath it, and you can copy or download the result.
When your work ends up in a document, every tool links to the matching PDF workflow, such as Word to PDF for a finished draft or Excel to PDF for a sheet of figures.
Questions
Frequently asked questions
Are these tools free?
Yes. Every tool on this page is free to use, with no account, no usage cap, and no watermark.
Is my data uploaded?
No. The calculators, generators, and word counter run in your browser. Birth dates, text, name lists, and measurements never leave your device.
How random are the random number generator and the wheel?
Both use crypto.getRandomValues(), the cryptographically strong random source built into modern browsers, with unbiased mapping onto your range or list.
Do these tools work on a phone?
Yes. Every tool is designed so its inputs, main action, and result fit on a phone screen without scrolling sideways.
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