Developer Tools
JSON formatting, Base64 encoding, hashing, UUIDs, regex testing and other everyday developer utilities, all running locally so you can safely paste code, tokens or config without it touching a server.
117 tools
JSON Formatter
Format, validate and minify JSON.
.env File Parser/Validator
Parse a .env file and flag duplicate keys, missing values and invalid names.
Anagram Checker
Check whether two words or phrases are anagrams of each other.
API Response Viewer
Format a raw HTTP response into a readable status, headers and JSON body view.
Attendance Calculator
See how many classes you can skip, or must attend, to hit a required percentage.
Base32 Encoder/Decoder
Encode or decode text as Base32.
Base64 Converter
Encode or decode text and files as Base64.
Border Radius Generator
Design per-corner CSS border radii visually and copy the code.
Case Converter
Convert text between camelCase, snake_case and more.
Certificate/CSR Decoder
Decode a PEM X.509 certificate or CSR to view its subject, issuer and validity.
CIDR / Subnet Calculator
Calculate network address, broadcast address and usable host range for a CIDR block.
Coin Flip
Flip a virtual coin and track your heads/tails streak.
Color Blindness Simulator
Preview an image as seen with different types of color blindness.
Color Harmony Finder
Find complementary, analogous and triadic colors for a base color.
Color Picker & Palette Generator
Pick colors, convert formats, and extract a palette from an image.
Compare File Hashes
Check whether two files are identical by comparing their hashes.
Cron Expression Explainer
Explain what a cron expression means in plain English.
Cron Expression Generator
Build a cron expression from a plain-English schedule.
Cron Job Visualizer
See the next run times for a cron expression on a calendar-style list.
CSS Box Shadow Generator
Design a CSS box-shadow visually and copy the code.
CSS Clamp() Generator
Generate a fluid CSS clamp() value for responsive typography and spacing.
CSS Flexbox Generator
Visually build a CSS Flexbox layout and copy the code.
CSS Grid Generator
Visually build a CSS Grid layout and copy the code.
CSS Minifier & Formatter
Minify CSS for production or format it for readability.
CSS Pattern Generator
Design a repeating CSS background pattern (dots, grid, lines) and copy the code.
Decision Maker
Get a random yes-or-no answer to a tough decision.
Dice Roller
Roll one or more virtual dice, from d4 to d20.
DNS Lookup
Look up a domain's A, AAAA, MX, TXT, NS and CNAME records.
Emoji Picker & Remover
Insert common emoji into text, or strip all emoji out of it.
Emoji Remover
Strip emoji from text, leaving the plain words behind.
Equation Solver
Solve a linear or quadratic equation for x.
File Converter
Convert data files between CSV, JSON and TSV.
Final Grade Calculator
Find out what score you need on a final exam to hit your target grade.
Find and Replace
Find and replace text, with optional regex support.
Flowchart Maker
Draw flowcharts with connected boxes and arrows, export as PNG or SVG.
Glassmorphism Generator
Design a frosted-glass CSS card effect and copy the code.
Gradient Generator
Design a CSS linear gradient and copy the code.
Hash Generator
Generate SHA-1, SHA-256 and SHA-512 hashes from text or a file.
Hex ↔ Text Converter
Convert text to hexadecimal, or hex back to text.
Hex Encoder/Decoder
Convert text to hexadecimal bytes, or decode hex back to text.
HTML ↔ Text Converter
Convert HTML to plain text, or plain text to simple HTML.
HTML Entity Encoder/Decoder
Encode text to HTML entities, or decode HTML entities back to text.
HTML Minifier
Minify HTML by stripping comments and unnecessary whitespace.
HTTP Header Parser
Parse raw HTTP headers into a readable, structured list.
HTTP Status Code Lookup
Look up the meaning of any HTTP status code.
Internet Speed Test
Measure your download speed, upload speed and ping.
IP Address Converter
Convert an IPv4 address between dotted decimal, integer, hex and binary.
JavaScript Minifier
Minify JavaScript by stripping comments and unnecessary whitespace.
JSON ↔ CSV Converter
Convert between JSON arrays and CSV tables.
JSON ↔ XML Converter
Convert between JSON and XML.
JSON Diff
Compare two JSON documents and highlight what changed.
JSON Schema Generator
Generate a JSON Schema from a sample JSON object.
JSON Schema Validator
Validate JSON data against a JSON Schema and see every error.
JSON to Java/Python
Generate a Java or Python class from a JSON object.
JSON to TypeScript
Generate TypeScript interfaces from a sample JSON object.
JSONPath Tester
Test JSONPath expressions against JSON data and see the matches.
JWT Decoder
Decode a JSON Web Token's header and payload.
Line Break Converter
Remove line breaks, or add them after each sentence.
List Cleaner
Trim whitespace, drop empty lines, and remove duplicates from a list.
Lorem Ipsum Generator
Generate placeholder Lorem Ipsum text.
Markdown ↔ HTML Converter
Convert Markdown to HTML, or HTML back to Markdown.
Markdown Previewer
Write Markdown and preview the rendered output side by side.
Markdown Table Generator
Build a Markdown table with a spreadsheet-style editor.
Markdown to Slides
Turn a markdown outline into slides you can open in Presentation Maker.
Meeting Time Planner
See a meeting time across multiple time zones at once.
MIME Type Lookup
Look up the MIME type for a file extension, or vice versa.
Mind Map Maker
Build a mind map by branching ideas from a central topic, export as PNG.
NanoID / Random ID Generator
Generate short, URL-safe random IDs.
Neumorphism Generator
Design a soft-UI neumorphic CSS shadow effect and copy the code.
Number Base Converter
Convert numbers between binary, octal, decimal and hex.
Number Lines
Add sequential numbers in front of every line.
Palindrome Checker
Check whether a word or phrase reads the same backwards.
Passphrase Generator
Generate a memorable, secure passphrase from random words.
Password Generator
Create strong, random passwords.
Password Strength Checker
Check how strong a password is, checked entirely in your browser.
Pomodoro Timer
A 25-minute focus timer with automatic short and long breaks.
Port Number Lookup
Look up what service commonly runs on a given network port.
Random Data Generator
Generate random placeholder emails, addresses or dates for testing.
Random Name Picker
Pick a random name from a list, for giveaways or team selection.
Random Number Generator
Generate one or more random numbers in a range, with an optional no-repeat mode.
Random Team Generator
Randomly split a list of names into balanced teams.
Random Username Generator
Generate random adjective-noun usernames, with an optional number suffix.
Random Word Generator
Generate a list of random words.
Regex Generator
Copy ready-made regular expressions for common patterns.
Regex Tester
Test regular expressions against sample text.
Remove Duplicate Lines
Delete repeated lines from a list or block of text.
Remove Extra Spaces
Collapse repeated spaces and trim whitespace from every line.
Remove HTML Tags
Strip HTML markup and get plain text.
Reverse Lines
Flip the order of lines in a block of text.
Semver Parser/Comparator
Parse and compare two semantic version numbers.
Slugify / URL Slug Generator
Convert text into a clean, URL-safe slug.
Sort Lines
Sort lines alphabetically, reverse alphabetically, or shuffle them.
Speaking Time Calculator
Estimate how long a script will take to read aloud.
Sprite Sheet Generator
Pack a sequence of image frames into a single sprite sheet with a frame map.
SQL Formatter
Format and beautify SQL queries for readability.
SSL Certificate Checker
Check a domain's SSL certificate issuer and expiry date.
Stopwatch
A stopwatch with lap tracking, right in your browser.
SVG Background Generator
Generate a repeating SVG background pattern (dots, grid, waves and more).
Text Diff Checker
Compare two blocks of text and highlight the differences.
Text Repeater
Repeat a word or block of text a set number of times.
Timestamp Converter
Convert between Unix timestamps and human-readable dates.
ULID Generator
Generate sortable, timestamp-based ULIDs.
Unicode Character Inspector
Inspect every character in a string and flag hidden/invisible ones.
Unicode Encoder/Decoder
Encode text to \uXXXX Unicode escapes, or decode them back to text.
URL & Query String Parser
Break a URL down into its protocol, host, path and query parameters.
URL Encoder/Decoder
Encode or decode URLs and query strings.
User-Agent Parser
Parse a user-agent string into browser, OS and device.
UUID Generator
Generate random UUIDs and GUIDs.
WCAG Contrast Checker
Check the contrast ratio between two colors against WCAG AA/AAA thresholds.
WHOIS Lookup
Look up a domain's registrar, registration and expiry dates.
Word Counter
Count words, characters and estimated reading time.
Word Frequency Counter
Find the most repeated words and check keyword density in a text.
XML Formatter
Format, validate and minify XML.
XPath Tester
Test XPath expressions against XML and see the matches.
YAML ↔ JSON Converter
Convert between YAML and JSON.
YAML ↔ XML Converter
Convert between YAML and XML.
YAML Formatter
Format and validate YAML, with clear error messages for invalid syntax.
Privacy
Every developer tool processes what you paste or type entirely in your browser. Nothing you enter, including code, JSON, tokens or generated passwords, is sent to or stored on a server.