Developer Tools
That Just Work
100+ free online tools for JSON, encoding, text, and data processing. 100% client-side — your data never leaves your browser.
JSON Tools
6 toolsText Tools
5 toolsEncoding
10 toolsBase64エンコーダー
テキストやバイナリデータを即座にBase64形式にエンコードします。
Base64デコーダー
Base64エンコードされた文字列を即座に読み取り可能なテキストにデコードします。
URLエンコーダー
HTTPリクエストで安全に使用するためにURLとクエリ文字列をエンコードします。
URLデコーダー
パーセントエンコードされたURL文字列を人間が読める形式にデコードします。
HTMLエンコーダー
HTML特殊文字を安全なHTMLエンティティにエンコードします。
HTMLデコーダー
HTMLエンティティを元の文字にデコードします。
JWTデコーダー
JWTトークンのヘッダー、ペイロード、署名をデコードして検査します。
タイムスタンプコンバーター
Unixタイムスタンプと人間が読める日付を相互変換します。
ハッシュジェネレーター
任意のテキストからMD5、SHA-1、SHA-256、SHA-512ハッシュを生成します。
UUIDジェネレーター
プロジェクトで使用するランダムなUUID v4識別子を生成します。
Data Tools
2 toolsXML Tools
3 toolsConverters
12 toolsText to Binary
Convert text to binary (0s and 1s) representation.
Binary to Text
Convert binary (0s and 1s) back to readable text.
HEX to Text
Convert hexadecimal values to readable text.
Text to HEX
Convert text to hexadecimal representation.
Unicode Converter
Convert text to Unicode code points and escape sequences.
ASCII Converter
Convert between text and ASCII decimal/hex codes.
Morse Code Converter
Convert text to Morse code and Morse code back to text.
ROT13 Encoder/Decoder
Encode or decode text using the ROT13 cipher (works both ways).
Base32 Encoder/Decoder
Encode and decode data using Base32 encoding.
Base58 Encoder/Decoder
Encode and decode data using Base58 encoding (used in Bitcoin/crypto).
Charset Converter
Inspect and convert between character encodings: UTF-8, Latin-1, ASCII.
URL Slug Generator
Generate SEO-friendly URL slugs from any text.
Hashing
7 toolsMD5 Hash Generator
Generate MD5 hashes from text or files. Note: MD5 is not cryptographically secure.
SHA1 Hash Generator
Generate SHA-1 hashes from any text. Note: SHA-1 is deprecated for security use.
SHA256 Hash Generator
Generate secure SHA-256 hashes from any text using the Web Crypto API.
SHA512 Hash Generator
Generate secure SHA-512 hashes from any text using the Web Crypto API.
HMAC Generator
Generate HMAC authentication codes using SHA-256 or SHA-512 with a secret key.
Hash Compare Tool
Compare two hash values to verify integrity or check if passwords match.
File Checksum Generator
Generate SHA-256, SHA-512, or SHA-1 checksums for any file to verify integrity.
Generators
16 toolsPassword Generator
Generate strong, random passwords with custom length and character sets.
Password Strength Checker
Check the strength and security of your password with entropy analysis.
Password Entropy Calculator
Calculate the exact entropy in bits of any password or string.
Random Number Generator
Generate random numbers in any range, single or bulk.
Random String Generator
Generate random strings with custom length, charset, and quantity.
Random Token Generator
Generate cryptographically secure random tokens for APIs, sessions, and secrets.
Random API Key Generator
Generate random API keys in various formats ready to use in your projects.
Webhook Secret Generator
Generate secure webhook secrets compatible with GitHub, Stripe, and other platforms.
Random Color Generator
Generate random colors in HEX, RGB, HSL, and CSS formats.
Random HEX Color Generator
Generate random HEX color codes for CSS and design work.
Random IP Generator
Generate random IPv4 and IPv6 addresses for testing and development.
Random MAC Address Generator
Generate random MAC addresses for network testing and development.
Random JSON Generator
Generate random JSON objects and arrays for testing and mocking APIs.
Random List Generator
Generate random lists of items — numbers, strings, or custom values.
Random Picker
Paste a list of names or items and pick one or more at random.
Fake Name Generator
Generate random fake names and personal data for testing and development.
Text Transform
4 toolsCase Converter
Convert text between uppercase, lowercase, title case, camelCase, snake_case and more.
Text Cleaner
Remove extra spaces, line breaks, special characters and clean up messy text.
Text Reverser
Reverse text characters, words, or lines.
Add Prefix/Suffix
Add a prefix, suffix, or both to each line of text.
Text Analysis
6 toolsWord Frequency Counter
Count how many times each word appears in your text.
Keyword Density Checker
Analyze keyword density in text for SEO optimization.
Keyword Extractor
Extract key terms and phrases from text automatically.
Entity Extractor
Extract emails, URLs, phone numbers, hashtags, and mentions from text.
Email Extractor
Extract all email addresses from any block of text.
URL Extractor
Extract all URLs and links from any block of text or HTML.
Code Tools
11 toolsHTML Minifier
Minify HTML by removing whitespace, comments, and unnecessary characters.
HTML Beautifier
Beautify and format HTML with proper indentation.
CSS Minifier
Minify CSS by removing whitespace, comments, and unnecessary characters.
CSS Beautifier
Beautify and format CSS with proper indentation and structure.
JavaScript Minifier
Minify JavaScript code by removing whitespace and comments.
JavaScript Beautifier
Beautify and format JavaScript code with proper indentation.
SQL Formatter
Format and beautify SQL queries with proper indentation and keyword highlighting.
Regex Tester
Test regular expressions against text with match highlighting and group capture.
Markdown to HTML
Convert Markdown text to HTML with live preview.
HTML to Markdown
Convert HTML markup to clean Markdown text.
Log Parser
Parse and analyze server logs, application logs, and structured log files.