Developer workbench
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Tools
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1Format & code
21Markdown to HTML Converter
Convert common Markdown headings, lists, links, emphasis and code into clean HTML.
XML Formatter & Minifier
Format compact XML for reading or remove spacing between tags for transport.
CSS Formatter & Minifier
Format CSS rules for reading or remove safe whitespace and comments for a compact result.
HTML Formatter & Minifier
Indent HTML structure for reading or collapse inter-tag whitespace and comments.
SQL Formatter
Add readable line breaks and indentation to common SELECT, INSERT, UPDATE and DELETE statements.
JSON to TypeScript Converter
Infer a readable TypeScript type from a JSON object, array or primitive value.
YAML & JSON Converter
Convert YAML to formatted JSON or JSON to clean YAML in your browser.
JSON Flatten & Unflatten
Flatten nested JSON into safe path keys or rebuild the original object and arrays.
JSON Key Sorter
Sort object keys recursively while preserving array order and values.
XML & JSON Tree Converter
Convert XML to a deterministic node tree and back; mixed content is rejected.
CSV Column Extractor
Select named CSV columns while preserving valid quoting and row structure.
CSV Transposer
Swap CSV rows and columns with strict rectangular CSV parsing.
TSV & CSV Converter
Convert tab-separated and comma-separated tables with quote-safe output.
NDJSON & JSON Array Converter
Convert newline-delimited JSON records to a JSON array and back.
Properties & JSON Converter
Convert Java properties files and flat JSON objects with standard separators, escapes and continuations.
INI & JSON Converter
Convert root keys and one-level INI sections to structured JSON and back.
JSON Object Merger
Merge exactly two JSON objects shallowly or recursively with safe keys.
CSV Row Deduplicator
Remove duplicate CSV records by a named key while keeping first or last.
MAC Address Formatter
Validate a 48-bit MAC address and output colon, hyphen, dotted and compact forms.
Shell Argument Quoter
Quote each input line as one POSIX or PowerShell argument without executing it.
IPv6 Compress & Expand
Validate IPv6 including embedded IPv4 tails, expand eight hextets or apply longest-zero compression.
Encode & hash
20URL Encoder & Decoder
Encode text for a URL or decode percent-encoded values locally.
Base64 Encoder & Decoder
Encode Unicode text to Base64 or decode Base64 without uploading it.
HTML Entity Encoder & Decoder
Escape HTML-sensitive characters or restore common and numeric entities.
JSON String Escape & Unescape
Escape text for a JSON string or restore escaped JSON string content.
SHA-256 Hash Generator
Calculate the SHA-256 digest of text locally with the Web Crypto API.
Regex Escape Tool
Escape regex metacharacters so user-provided text can be matched literally.
CSV & JSON Converter
Convert RFC 4180-style CSV rows to JSON or an array of JSON objects back to CSV.
SHA-1 Hash Generator
Calculate a SHA-1 digest locally for compatibility checks and legacy fingerprints.
SHA-512 Hash Generator
Calculate the SHA-512 digest of text locally with the Web Crypto API.
HMAC-SHA256 Generator
Sign a message with a secret key using HMAC-SHA256 entirely in your browser.
Text & Binary Converter
Convert UTF-8 text to eight-bit binary bytes or decode binary bytes back to text.
Unicode Escape Converter
Convert text to JavaScript-style Unicode escapes or restore escaped code points.
ROT13 Encoder & Decoder
Apply the reversible ROT13 letter substitution locally.
Base32 Encoder & Decoder
Encode UTF-8 text with RFC 4648 Base32 or decode Base32 locally.
Text & Hex Converter
Convert UTF-8 text to hexadecimal bytes or restore hex bytes to text.
Morse Code Translator
Translate Latin letters, digits and common punctuation to or from Morse code.
Data URI Encoder & Decoder
Create a text Data URI or decode percent-encoded and Base64 Data URIs locally.
Base64URL Encoder & Converter
Encode Unicode text, decode Base64URL, or convert between standard and URL-safe alphabets.
IPv4 & Number Converter
Convert an IPv4 address to unsigned decimal and hexadecimal, or convert a number back.
JSON & Query String Converter
Convert flat JSON values and arrays to query parameters or parse repeated parameters.
Text processing
19Text Case Converter
Convert text to upper, lower, title, sentence, camel, snake or kebab case.
Whitespace Remover
Trim lines, collapse repeated spaces or remove every whitespace character.
Line Sorter
Sort lines alphabetically, naturally or by length without uploading them.
Duplicate Line Remover
Remove duplicate lines while preserving the first occurrence and original order.
Text Reverser
Reverse Unicode characters, word order or line order locally.
URL Slug Generator
Turn a title into a clean lowercase URL slug with normalized separators.
Text Diff Checker
Compare two blocks line by line and highlight additions, removals and unchanged lines.
Word Frequency Counter
Count and rank repeated words with case-insensitive Unicode-aware matching.
Email & URL Extractor
Extract unique email addresses and HTTP links from pasted text.
Line Numberer & Bullet Tool
Add line numbers or bullets to text, or remove common list prefixes.
Number to English Words
Write a bounded signed decimal number as readable English words without rounding.
Find & Replace Text
Replace literal text once or everywhere with no regular-expression surprises.
Line Prefix & Suffix Tool
Add or remove a fixed prefix and suffix on every line locally.
Text Line Wrapper
Wrap at word boundaries or hard-wrap by Unicode character count.
Text Truncator
Limit text by Unicode characters or words and mark truncated output.
Text Join & Split
Join lines with a literal delimiter or split text into one item per line.
Unicode Normalizer
Normalize Unicode text to NFC, NFD, NFKC or NFKD entirely locally.
Tabs & Spaces Converter
Convert leading indentation between tabs and configurable tab stops.
Initials Generator
Create initials for each name using every word or only first and last.
Inspect & parse
20Regex Tester
Test a JavaScript regular expression against real text and inspect every match without sending the text anywhere.
JWT Decoder
Inspect a JWT header and payload locally without sending or verifying the token.
Unix Timestamp Converter
Convert Unix seconds, milliseconds or an ISO date into readable UTC and local time.
Word & Character Counter
Count words, characters, lines, sentences and estimated reading time locally.
Query String Parser
Parse a URL or query string into readable JSON, including repeated parameters.
Number Base Converter
Convert a safe integer written in decimal, binary, octal or hexadecimal.
HEX, RGB & HSL Color Converter
Convert a HEX, RGB or HSL color into all three web color formats locally.
URL Parser
Break a URL into protocol, host, port, path, query parameters and fragment.
Email Syntax Validator
Check one email address per line for common syntax and domain-format problems.
Cron Expression Explainer
Validate a standard five-field cron expression and explain each scheduling field.
Unicode Code Point Inspector
Inspect each character as a Unicode code point, decimal value and UTF-8 byte sequence.
HTTP Status Code Lookup
Look up the meaning and category of common HTTP response status codes.
MIME Type Lookup
Find a common MIME type from a file extension or list extensions for a MIME type.
User-Agent Parser
Get a practical browser, engine, operating system and device summary from a User-Agent string.
URL Normalizer & Tracking Cleaner
Normalize an HTTP URL deterministically or remove common tracking parameters and fragments.
Semantic Version Comparator
Compare or sort strict SemVer 2.0.0 versions, including prerelease precedence.
Character Frequency Counter
Count every Unicode character and sort by frequency with code points.
UUID Validator
Validate UUID text, RFC variant and version for up to one thousand values.
Color Contrast Checker
Measure WCAG contrast for two HEX colors and report common thresholds.
HTTP Header Parser
Parse repeated HTTP header fields into safe normalized JSON.
Secure generators
12UUID v4 Generator
Generate cryptographically random UUID v4 identifiers in your browser.
Lorem Ipsum Generator
Generate one to twenty paragraphs of predictable placeholder copy.
Random String Generator
Generate a cryptographically random URL-safe string in the browser.
Strong Password Generator
Generate cryptographically random passwords with configurable length and character sets.
List Randomizer
Shuffle a line-separated list with the browser cryptographic random source.
Secure Random Number Generator
Generate bounded random integers, with an option to prevent duplicates.
UTM Campaign URL Builder
Add validated campaign source, medium, name, term and content parameters to a URL.
Open Graph Meta Tag Generator
Generate escaped Open Graph and Twitter Card meta tags from key-value input.
QR Code Generator
Create reliable local static QR codes, or use the QR Workspace for editable content, forms and records.
Text Repeater
Repeat a text block continuously or on separate lines with output limits.
ULID Generator & Decoder
Generate secure ULIDs or decode their 48-bit UTC timestamp locally.
CSS Gradient Generator
Generate a normalized linear or radial two-color CSS gradient declaration.
Convert & calculate
24IPv4 CIDR Calculator
Calculate network, broadcast, subnet mask and usable host range from IPv4 CIDR notation.
Percentage Calculator
Calculate a percentage of a number, what percent one number is of another, or percentage change.
Unit Converter
Convert common length, mass and temperature units with a simple value-from-to expression.
Date Difference Calculator
Calculate calendar days, weeks and exact duration between two ISO dates or date-times.
Roman Numeral Converter
Convert whole numbers from 1 to 3999 into canonical Roman numerals or back.
Mean, Median & Statistics Calculator
Calculate count, sum, mean, median, mode, range and standard deviation.
Aspect Ratio Calculator
Simplify image dimensions to an aspect ratio or scale them to a target width.
Chmod Permission Calculator
Convert Unix file permissions between octal and symbolic notation, including special bits.
Exact Fraction Calculator
Add, subtract, multiply or divide fractions with exact simplified and mixed-number results.
Prime Factorization
Factor a signed whole number up to one trillion and group repeated prime factors.
GCD & LCM Calculator
Calculate the exact greatest common divisor and least common multiple of several integers.
Time Duration Calculator
Add, subtract or compare readable and clock-formatted durations with exact seconds.
Exact Age Calculator
Calculate calendar age and total elapsed days for an explicit as-of date.
Business Days Calculator
Count Monday-to-Friday days between two ISO dates, inclusive or exclusive.
Date Add & Subtract
Add or subtract days, weeks, months or years with calendar-safe clamping.
ISO Week Calculator
Find the ISO week-year, week number and weekday for an ISO date.
UTC Offset Time Converter
Convert a local date-time between explicit fixed UTC offsets.
Ratio Simplifier
Reduce a positive integer ratio exactly using its greatest common divisor.
Proportion Solver
Solve one missing value in a four-part proportion with strict zero checks.
Quadratic Equation Solver
Solve real or complex roots from coefficients a, b and c.
Triangle Calculator
Calculate perimeter, Heron area and three angles from valid side lengths.
Circle Calculator
Calculate radius, diameter, circumference and area from one measurement.
Tip & Bill Split Calculator
Calculate tip, total and per-person amount without currency assumptions.
Fuel Cost Calculator
Estimate liters and cost from kilometers, L/100 km and unit price.
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