Popular tools
Start with the utilities people reach for most
Quick access to common developer and sysop jobs: cron expressions, text decoding, CSV exports, QR codes, passwords, and SQL formatting.
Cron Expression Converter, Generator, Decoder & Calculator
Use this free online cron expression converter, generator, decoder, and calculator to build, evaluate, calculate, convert, and explain 5-part crontab schedules in plain English.
Hex to UTF-8 Converter
Instantly decode hex to readable UTF-8 text or convert UTF-8 text back to hex bytes. A free, secure online utility for hex and UTF-8 conversion.
JSON to CSV Converter
Paste JSON, convert it to CSV in seconds, then copy or download the result—no upload, signup, or spreadsheet cleanup required.
Static QR Code Generator
Generate static QR codes instantly directly in your browser. Supports URLs, WiFi config, text, crypto addresses, and JSON with SVG/PNG exports.
Secure Password & Passphrase Generator
Generate strong, secure passwords or memorable passphrases instantly. Completely client-side for total privacy.
SQL Formatter
Format and indent your messy SQL queries to make them readable. Supports multiple SQL dialects.
Data & Text
6 toolsJSON to YAML Converter
A simple, browser-based JSON to YAML converter. It takes a JSON payload and converts it to YAML.
JSON to CSV Converter
Paste JSON, convert it to CSV in seconds, then copy or download the result—no upload, signup, or spreadsheet cleanup required.
Count Duplicates in a List
Aggregate lines and count occurrences. Find duplicate lines or count repeats in Excel columns.
Diff Checker
Compare two text blocks line-by-line and highlight differences with added, removed, and unchanged lines.
PHP print_r to JSON
Convert PHP print_r output back to valid JSON format.
YAML to TOML Converter
Instantly convert your YAML configuration data into clean, valid TOML format. Fast, free, and completely client-side.
Developer Tools
12 toolsASCII Table
Complete ASCII character table with decimal, hex, octal, and HTML entity values.
JSON Schema Validator
Validate JSON data against a JSON Schema with support for Draft 2020-12, Draft 2019-09, Draft 7, and earlier.
View Character Codes
View decimal, hexadecimal, octal, and UTF-8 byte values for any character or text.
Real-Time HTML Editor
Use this real-time HTML editor to write markup, CSS, and small JavaScript snippets in an online HTML editor with a live HTML preview. It is a quick HTML preview tool for testing snippets before you paste them into a site or app.
World Time Buddy
Compare timezones side-by-side with live clocks and a 24-hour grid to find the best meeting times across locations.
JWT (JSON Web Token) Decoder
Decode and inspect JWT tokens to see the header, payload, and signature. Perfect for debugging authentication.
Check Regex Online - Regex Tester
Check regex online against sample text in real time. Highlight matches, inspect capture groups, toggle JavaScript flags, and debug patterns without leaving the page.
Cron Expression Converter, Generator, Decoder & Calculator
Use this free online cron expression converter, generator, decoder, and calculator to build, evaluate, calculate, convert, and explain 5-part crontab schedules in plain English.
SQL Formatter
Format and indent your messy SQL queries to make them readable. Supports multiple SQL dialects.
Unix Timestamp Converter (Epoch Converter)
Convert human-readable dates to Unix timestamps (epoch) and vice versa. Includes a live current epoch display with a 'Get Current Epoch' button.
Bcrypt Hash Generator & Verifier
Generate secure bcrypt hashes from plaintext or verify existing hashes instantly.
HTTP Status Code Reference
A quick, searchable index of all standard HTTP response status codes. Quickly identify the meaning behind 200, 404, 500, and more.
Encoders & Decoders
5 toolsUTF-8 Encoder/Decoder
Encode text to UTF-8 \xNN byte sequences or decode \xNN sequences back to text.
Base64 Encoder/Decoder
Encode plain text to Base64 or decode Base64 back to readable UTF-8 text instantly in your browser.
Hex to UTF-8 Converter
Instantly decode hex to readable UTF-8 text or convert UTF-8 text back to hex bytes. A free, secure online utility for hex and UTF-8 conversion.
Number Base Converter
Convert numbers between Decimal (base 10), Hexadecimal (base 16), Binary (base 2), and Octal (base 8) instantly.
URL Encoder/Decoder
Encode or decode strings to and from URL-encoded format (percent-encoding).
Generators
5 toolsStatic QR Code Generator
Generate static QR codes instantly directly in your browser. Supports URLs, WiFi config, text, crypto addresses, and JSON with SVG/PNG exports.
Secure Password & Passphrase Generator
Generate strong, secure passwords or memorable passphrases instantly. Completely client-side for total privacy.
Generate Calendar Dates
Generate a sequence of calendar dates with customizable start date, interval, count, and output format.
UUID Generator
Generate UUIDs (v4 random or v7 timestamp-based) with configurable quantity, case, and formatting options.
Campaign URL Builder
Build custom campaign URLs with UTM parameters for tracking marketing campaigns in Google Analytics.
Network
7 toolsCORS Test
Test CORS headers and make cross-origin HTTP requests with custom methods and headers.
WebSocket Tester
Test WebSocket connections by connecting to ws:// or wss:// endpoints and sending/receiving messages in real-time.
Fake Mailer
Create fake email messages with custom sender, recipient, subject, attachments, and HTML or plain text content.
DNS Typosquat Scanner
Scan for typosquatting and similar domains - generate variants and check DNS resolution to find potentially malicious domains.
DNS Lookup
Look up DNS records (A, AAAA, MX, NS, TXT, CNAME, SOA) for any domain using Google DNS-over-HTTPS.
IP Bulk Lookup
Lookup domain, location, ISP and ASN for multiple hosts (IPs or domains) at once. Supports optional DNS record lookup.
What is my IP
Quickly find your public IP address. The simplest and fastest way to see your public-facing IP.