Business
Payment Fee Calculator
Estimate percentage-plus-fixed transaction fees, net proceeds, or the amount to charge to receive a target payout.
Open toolTools
Browse free browser-based calculators, generators, converters, and web utilities for business, finance, development, marketing, text, and everyday tasks. Each tool is designed to solve a focused problem quickly, with plain-language explanations when the formula, format, or limitation matters.
Choose a category to narrow the list, or open a tool directly. If you want to understand the reasoning behind a result, the Guides library includes worked examples, technical explanations, and practical checklists that connect back to the tools.
Developer
JSON Formatter & Validator
Validate, pretty-print, and minify JSON directly in your browser so malformed data is easier to spot and valid data is easier to read.
Open toolWeb
URL Slug Generator
Turn a title or phrase into a clean lowercase URL slug with readable separators and an optional length limit.
Open toolFinance
Canadian Sales Tax Calculator
Estimate GST, HST, PST, RST, or QST by Canadian province or territory, before tax or from a tax-included total.
Open toolText
Text Case Converter
Convert pasted text between lowercase, UPPERCASE, Title Case, and sentence case, then copy the result with one click.
Open toolMarketing
UTM Builder
Build a campaign URL with source, medium, campaign, term, and content UTM parameters using a consistent naming structure.
Open toolFinance
Percentage Calculator
Calculate a percentage of a number, find what percent one value is of another, or measure percentage increase and decrease.
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