How-to guides
Clear, free tutorials for every ToolOtter utility, text, developer and calculator tools explained simply.
Text Tools
How to Count Words and Characters
Learn how to count words, characters and reading time for essays, articles and social posts. A free guide to using an online word counter effectively.
Read guide โHow to Change Text Case
A free guide to changing text case online, UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and kebab-case, and when to use each.
Read guide โHow to Compare Two Texts and Find the Differences
Learn how to compare two blocks of text and spot every change. A free guide to using an online diff tool for drafts, code and documents.
Read guide โWhat Is Lorem Ipsum and How to Generate Placeholder Text
A guide to Lorem Ipsum placeholder text: what it is, why designers use it, and how to generate paragraphs, sentences or words for your mockups for free.
Read guide โDeveloper
How to Format and Validate JSON
Learn how to format, validate and minify JSON online for free. A developer guide to beautifying messy JSON, fixing errors and compressing it for production.
Read guide โWhat Is Base64 and How to Encode or Decode It
A guide to Base64 encoding: what it is, when to use it, and how to encode or decode text (including Unicode and emoji) online for free.
Read guide โHow to URL-Encode Text
Learn how to URL-encode and decode text online for free. A guide to percent encoding for query strings, parameters and safe links.
Read guide โHow to Generate a SHA-256 Hash
A guide to hashing: what SHA-256, SHA-1 and SHA-512 are, when to use them, and how to generate a hash of any text online for free.
Read guide โHow to Create a QR Code for Free
Learn how to make a QR code for a link, menu or business card for free. A guide to generating and downloading QR codes with no watermark or sign-up.
Read guide โCalculators
How to Create a Strong Password
Learn what makes a password strong and how to generate secure random passwords for free. A guide to length, character types and safe password habits.
Read guide โHow to Calculate Percentages
A clear guide to calculating percentages: percent of a number, what percent one number is of another, and percentage increase or decrease, with examples.
Read guide โHow to Calculate Loan Payments
Learn how monthly loan payments (EMI) are calculated and how to estimate interest and total cost for any loan. A free guide with the formula and examples.
Read guide โHow to Convert Units
A free guide to converting units of length, weight and temperature between metric and imperial, with formulas, common conversions and examples.
Read guide โ