Pro Calculators and Guides
How to Change Text Case: UPPERCASE, lowercase, Title Case, Sentence case, camelCase and More
Fix text typed with caps lock on, format headings and names, and convert to camelCase, snake_case or kebab-case in one click.
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Pro Calculators and Guides
Specialist calculators are only useful when you understand the rules behind the numbers. These guides explain what each professional calculator does, which inputs matter, how to read the result and where the official rules come from, covering payroll and tax, immigration and visas, housing, business compliance, engineering and science. Every guide links to a free tool that runs in your browser and keeps your figures private.
318 guides
Pro Calculators and Guides
How to Change the Page Size of a PDF to A4, US Letter, Legal, A5 or A3
Rescale every page to a new paper size, centred and in the right shape, so it prints correctly or fits a form's requirement.
Pro Calculators and Guides
How to Check Character Limits for X, Instagram, LinkedIn, YouTube and Meta Descriptions
See how many characters you have used against the limits of social platforms and search results, with a quick table of current limits.
Pro Calculators and Guides
How to Check If a Number Is Prime and Find Its Prime Factors
Test any whole number up to one trillion, see its prime factorisation and the nearest primes before and after.
Pro Calculators and Guides
How to Check If a Word or Sentence Is a Palindrome (With Examples)
Test whether text reads the same backwards, ignoring spaces, punctuation and case. Includes famous examples and a strict mode.
Pro Calculators and Guides
How to Check Password Strength and What Entropy Means
See a password's length, character types, entropy in bits and a rough time to guess it, without sending it anywhere.
Pro Calculators and Guides
How to Check Photo and Signature Size Before Uploading to a Job or Exam Form
Compare your file's width, height and KB with the limits of a job or exam portal so you do not lose an upload attempt.
Pro Calculators and Guides
How to Compare Two Loans Side by Side: Monthly Payment, Interest and Fees
Compare two loan offers by monthly payment, total interest and total cost including fees, and decide which one is really cheaper.
Pro Calculators and Guides
How to Convert a PDF to Markdown With Headings, Lists and Tables
Turn the text of a PDF into a Markdown file with headings, lists, bold and italic text and tables, ready for GitHub, Notion or Obsidian.