Developer Utilities

Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.

Developer Utilities
Calculate loan monthly payment with interest
POST /calc2/loan-monthly-payment$0.002
Developer Utilities
Calculate macronutrient split from calories and percentages
POST /calc2/macro-split-calculate$0.002
Developer Utilities
Estimate one-rep max with the Epley formula
POST /calc2/one-rep-max-estimate$0.002
Developer Utilities
Calculate overtime pay from hourly rate, hours, and multiplier
POST /calc2/overtime-pay$0.002
Developer Utilities
Convert running pace to speed
min/km, min/mile, km/h and mph
POST /calc2/pace-to-speed-convert$0.002
Developer Utilities
Calculate percentage change
increase or decrease calculator
POST /calc2/percentage-change$0.002
Developer Utilities
Calculate percentage of an amount
percentage calculator
POST /calc2/percentage-of-amount$0.002
Developer Utilities
Simplify and scale a ratio
2 or 3 terms to any total
POST /calc2/ratio-simplify$0.002
Developer Utilities
Retirement savings future value calculator
POST /calc2/retirement-future-value$0.002
Developer Utilities
Calculate pre-tax price from total
reverse sales tax
POST /calc2/reverse-sales-tax$0.002
Developer Utilities
Convert salary to hourly rate
annual and hourly pay calculator
POST /calc2/salary-hourly-convert$0.002
Developer Utilities
Calculate price with sales tax
tax amount and total
POST /calc2/sales-tax-add$0.002
Developer Utilities
Calculate time to reach a savings goal with monthly contributions
POST /calc2/savings-goal-time$0.002
Developer Utilities
Calculate simple interest
interest earned and final amount
POST /calc2/simple-interest$0.002
Developer Utilities
Estimate body frame size from height and wrist measurement
POST /calc3/body-frame-size-estimate$0.002
Developer Utilities
Calculate calories from macros
protein, carbs and fat
POST /calc3/calories-to-macros-reverse$0.002
Developer Utilities
Price ladder calculator
markup prices for every customer tier
POST /calc3/markup-price-ladder$0.002
Developer Utilities
Convert ratio to percentage
percentage of each part
POST /calc3/ratio-to-percentage-convert$0.002
Developer Utilities
Rule of three calculator
solve direct and inverse proportions
POST /calc3/rule-of-three-solve$0.002
Developer Utilities
Split a shared expense by unequal shares
POST /calc3/split-expenses-unequal-shares$0.002
Developer Utilities
Feels-like temperature calculator
wind chill or heat index automatically
POST /calc3/temperature-feels-like-wind-or-humidity$0.002
Developer Utilities
Convert cooking measurements
metric and imperial by ingredient
POST /calc3/unit-conversion-cooking-metric-imperial$0.002
Developer Utilities
Calculate weighted average of values with corresponding weights
POST /calc3/weighted-average-grade$0.002
Developer Utilities
Lookup an ASCII Character Code in Decimal, Hex, Octal, and Binary
POST /dev2/ascii-table-lookup$0.002
Developer Utilities
Convert number between bases 2–36 with digit validation
POST /dev2/base-convert-number$0.002
Developer Utilities
CSS Beautifier
Format and Indent CSS Code Online
POST /dev2/beautify-css$0.002
Developer Utilities
HTML Beautifier
Format and Indent HTML Code Online
POST /dev2/beautify-html$0.002
Developer Utilities
JavaScript Beautifier
Format and Indent JS Code Online
POST /dev2/beautify-js$0.002
Developer Utilities
Format a Keep a Changelog entry from grouped changes
POST /dev2/changelog-entry-format$0.002
Developer Utilities
Parse command-line arguments with a flag and option spec
POST /dev2/cli-arg-parse-spec$0.002
Developer Utilities
Conventional Commits message linter and parser
POST /dev2/commit-message-lint$0.002
Developer Utilities
Count lines of code by type
code, comments and blanks
POST /dev2/count-lines-of-code$0.002
Developer Utilities
Build a curl command from an HTTP request
POST /dev2/curl-command-build$0.002
Developer Utilities
Compute a code file line diff
added, removed and unchanged lines
POST /dev2/diff-two-code-files$0.002
Developer Utilities
Parse a Docker Image Reference into Registry, Repository, Tag, or Digest
POST /dev2/docker-tag-parse$0.002
Developer Utilities
Dockerfile best practices linter with line numbers
POST /dev2/dockerfile-lint-basic$0.002
Developer Utilities
Parse dotenv file content into key-value pairs
POST /dev2/env-file-parse$0.002
Developer Utilities
Check a path against .gitignore patterns
POST /dev2/gitignore-check-path$0.002
Developer Utilities
Parse Raw HTTP Headers into a Key-Value Object
POST /dev2/http-header-parse$0.002
Developer Utilities
Check whether an HTTP method is safe or idempotent
POST /dev2/http-method-idempotent-check$0.002
Developer Utilities
List HTTP status codes by category and reason phrase
POST /dev2/http-status-by-category$0.002
Developer Utilities
Query JSON with JSONPath-style expressions
POST /dev2/json-path-query$0.002
Developer Utilities
Generate a TypeScript interface from JSON
POST /dev2/json-to-typescript-interface$0.002
Developer Utilities
Detect file line ending style
count LF and CRLF breaks
POST /dev2/line-ending-detect$0.002
Developer Utilities
Extract links from Markdown
text and URLs
POST /dev2/markdown-link-extract$0.002
Developer Utilities
Generate a table of contents from Markdown
POST /dev2/markdown-toc-generate$0.002
Developer Utilities
Minify HTML code and measure the size reduction
POST /dev2/minify-html$0.002
Developer Utilities
Minify JavaScript whitespace and measure the size reduction
POST /dev2/minify-js$0.002
Developer Utilities
Check a Version Against a SemVer Range
POST /dev2/package-version-range-check$0.002
Developer Utilities
Explain a regex pattern in plain language
POST /dev2/regex-explain$0.002
Developer Utilities
Escape regex special characters for a literal match
POST /dev2/regex-special-char-escape$0.002
Developer Utilities
Bump a Semantic Version by Major, Minor, or Patch
POST /dev2/semver-bump$0.002
Developer Utilities
Compare Semantic Version Numbers with SemVer Precedence
POST /dev2/semver-compare$0.002
Developer Utilities
Build a parameterized SQL WHERE clause from filters
POST /dev2/sql-where-builder$0.002
Developer Utilities
Compute two's complement binary
encode or decode signed integers
POST /dev2/two-complement-convert$0.002
Developer Utilities
YAML indentation and syntax checker with line numbers
POST /dev2/yaml-lint-basic$0.002
Developer Utilities
Bicycle Gear Ratio and Development Calculator
POST /final3/bike-gear-ratio-calculate$0.002
Developer Utilities
Split carpool commute cost among riders
POST /final3/commute-carpool-cost-split$0.002
Developer Utilities
Estimate EV charging time remaining from battery size and charger power
POST /final3/ev-charging-time-estimate$0.002
Developer Utilities
EV Road Trip Charging Stops Calculator
POST /final3/ev-road-trip-range-planner$0.002