무료 온라인 개발자 도구
개발을 위한 스위스 아미 나이프
100가지 이상의 사용 사례를 지원하는 무료 개발자 도구 — 모두 브라우저에서 실행됩니다. 가입 불필요, 추적 없음, 서버 처리 없음.
암호화 & 해시
SHA Hash & HMAC Generator
Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes and HMAC signatures with this free online tool. No sign-up required, runs entirely in your browser.
Secure Password Generator
Generate strong, random passwords with customizable length and character sets using this free online tool. No sign-up required, runs entirely in your browser.
UUID v4 & v7 Generator
Generate UUID v4 (random) and UUID v7 (timestamp-based) identifiers in bulk with this free online tool. No sign-up required, runs entirely in your browser.
Bcrypt Hash Generator & Verifier
Generate and verify bcrypt password hashes with adjustable cost factor using this free online tool. No sign-up required, runs entirely in your browser.
AES Encryption & Decryption Tool
Encrypt and decrypt text with AES-GCM or AES-CBC using this free online tool. Password-based key derivation via PBKDF2. No sign-up required, runs entirely in your browser.
TOTP Authenticator — Two-Factor Code Generator
Free online TOTP authenticator that generates time-based one-time passwords. Supports SHA-1, SHA-256, SHA-512 algorithms. No sign-up, runs in your browser.
X.509 Certificate Decoder
Free online X.509 certificate decoder. Parse PEM certificates to view subject, issuer, validity, SAN, fingerprints, and extensions. No sign-up required.
Ed25519 Key Generator — Sign & Verify
Free online Ed25519 key pair generator with message signing and signature verification. Uses the Web Crypto API. No sign-up, runs in your browser.
BIP39 Mnemonic Generator — Seed Phrase Creator
Free online BIP39 mnemonic generator. Create 12-24 word seed phrases with cryptographic entropy and checksum validation. No sign-up, runs in your browser.
PGP Encryption & Decryption — OpenPGP Online
Free online PGP encryption and decryption tool powered by OpenPGP.js. Encrypt messages with public keys, decrypt with private keys, and generate ECC/RSA key pairs. No sign-up required.
인코더 & 변환기
Base64 String Encoder & Decoder
Encode and decode Base64 strings instantly with this free online converter. Supports standard and URL-safe Base64. No sign-up required, runs entirely in your browser.
URL Encoder & Decoder — Free Online
Encode and decode URLs instantly with this free online tool. Supports encodeURIComponent and encodeURI modes for query strings and full URLs. No sign-up required.
Base64 File Converter — Free Online
Convert files to Base64 and Base64 back to files with this free online tool. Supports images, PDFs, and any binary file. No sign-up required.
HTML Entity Encoder & Decoder — Free Online
Encode and decode HTML entities instantly with this free online tool. Escape special characters to prevent XSS and display issues. No sign-up required.
Number Base Converter
Free online number base converter. Convert between binary, octal, decimal, hexadecimal, and any base from 2 to 36 instantly.
.env / YAML / JSON Converter — Free Online
Convert between .env, JSON, and YAML formats instantly with this free online converter. Transform environment variable files, configuration formats, and dotenv files with one click.
Text Encoder Explorer — Unicode, UTF-8, UTF-16 Byte Inspector
Explore how text is encoded in UTF-8, UTF-16, and Unicode code points. View per-character byte breakdowns, hex dumps, and encoding statistics. Free online tool, runs entirely in your browser.
웹 & 인증
JWT & Bearer Token Inspector - Decode JSON Web Tokens
Free online JWT decoder and Bearer token inspector. Decode JWT headers, payloads, and check expiration claims instantly in your browser.
QR Code Generator & Reader
Free online QR code generator and reader. Create QR codes from text or URLs and decode QR codes from uploaded images instantly.
URL Parser - Parse & Analyze URL Components Online
Free online URL parser tool. Break down any URL into its components — protocol, hostname, port, path, query parameters, and hash fragment.
HTTP Request Builder
Free online HTTP request builder. Visually construct API requests and generate ready-to-use curl, fetch, and axios code snippets.
HTTP Status Codes Reference - Complete Status Code Guide
Free online HTTP status codes reference. Search and browse all HTTP response status codes with descriptions, categories, and common use cases.
Basic Auth Generator & Decoder - HTTP Authorization Header
Free online Basic Auth header generator and decoder. Create HTTP Basic Authorization headers from credentials or decode existing headers instantly.
OAuth2 Token Debugger - Decode Tokens & Parse Auth URLs
Free online OAuth2 token debugger. Decode JWT access tokens and id tokens, parse OAuth2 authorization URLs, and inspect OIDC parameters.
OG Meta Tag Preview
Free online Open Graph meta tag preview tool. See how your page looks on Google, Facebook, Twitter, and LinkedIn before publishing.
Cookie Parser
Free online cookie parser tool. Parse and inspect Set-Cookie headers and document.cookie strings to view names, values, and attributes.
CORS Header Checker
Free online CORS header checker and analyzer. Validate Access-Control headers, diagnose cross-origin issues, and verify preflight configuration.
OpenAPI / Swagger Viewer
Free online OpenAPI 3.x viewer. Paste YAML or JSON to visualize API endpoints, parameters, responses, and schemas. No sign-up required.
CSP Header Builder
Free online Content Security Policy (CSP) header builder and generator. Visually configure CSP directives, validate policies, and test URLs against your security rules.
SAML Response Decoder - Decode & Format SAML XML
Free online SAML response decoder. Decode Base64-encoded SAML responses, format the XML output, and inspect SSO assertions instantly.
robots.txt & Sitemap Validator - Validate Robots Rules & Sitemap XML Online
Free online robots.txt and sitemap.xml validator. Parse and validate robots.txt directives, test URL access rules, and verify sitemap XML structure, URLs, and metadata.
HTTP Header Parser - Analyze & Inspect HTTP Headers Online
Free online HTTP header parser tool. Parse raw HTTP headers, inspect key-value pairs, and check security headers like CSP, HSTS, X-Frame-Options, and more.
Device Information - Browser, Screen & Hardware Details
View detailed device and browser information including user agent, screen resolution, GPU, CPU cores, memory, connection type, and more — all detected in real time.
개발
Regex Tester & Debugger
Free online regex tester to match, replace, and debug regular expressions with real-time highlighting and capture group support.
Unix Timestamp Converter
Free online Unix timestamp converter to convert between epoch timestamps and human-readable dates in ISO, UTC, and local formats.
Color Converter & Picker
Free online color converter and picker tool to convert between HEX, RGB, and HSL formats with a visual color preview.
Crontab Generator & Explainer
Free online crontab expression generator and explainer. Build cron schedules visually or paste an expression to get a plain-English description.
Text Diff Viewer & Comparator
Free online diff viewer to compare two texts side by side or in unified format, highlighting additions, deletions, and changes instantly.
Text Case & Format Converter
Free online text case converter to transform text between camelCase, snake_case, PascalCase, kebab-case, and 10+ other formats instantly.
Chmod Permission Calculator
Free online chmod calculator to set Unix/Linux file permissions. Convert between octal, symbolic notation, and get the chmod command instantly.
Docker Run to Compose Converter
Free online tool to convert docker run commands to docker-compose.yml format. Instantly transform container commands into composable YAML configurations.
Code Formatter — Prettier Online
Free online code formatter powered by Prettier. Format JavaScript, TypeScript, HTML, Vue, CSS, SCSS, JSON, YAML, Markdown, and GraphQL with customizable options. No sign-up required.
Fake Data Generator
Generate realistic fake data for testing and development — names, emails, addresses, phone numbers, UUIDs, and more. Powered by Faker.js with multi-locale support.
URL Slug Generator
Free online URL slug generator. Convert any text to SEO-friendly, URL-safe slugs with customizable separators, case options, and length limits.
CSS Unit Converter
Free online CSS unit converter. Convert between px, rem, em, pt, %, vw, and vh with customizable base font size and viewport dimensions.
Lorem Ipsum Generator
Free online Lorem Ipsum placeholder text generator. Generate dummy text by paragraphs, sentences, or words for mockups and designs.
Mermaid Live Editor — Diagram Generator
Free online Mermaid diagram editor. Create flowcharts, sequence diagrams, class diagrams, Gantt charts, pie charts, and mind maps. Export to SVG or PNG. No sign-up required.
Accessibility Color Contrast Checker
Free online WCAG color contrast checker. Calculate contrast ratios, verify AA/AAA compliance, preview text readability, and simulate color blindness for accessible design.
Date-Time Converter with Timezone Support
Free online date-time converter to convert dates and times across timezones. Supports ISO 8601, RFC 2822, Unix timestamps, and relative time — powered by native Intl APIs.
Git Cheatsheet - Quick Command Reference & Memo
Free online Git cheatsheet with searchable commands organized by category. Quickly find Git commands for branching, merging, rebasing, stashing, resetting, and more.
Git Commit Message Generator
Free online Git commit message generator using the Conventional Commits format. Build structured commit messages with type, scope, description, body, breaking changes, and footer fields.
Nginx Config Generator
Free online Nginx configuration file generator. Build server blocks with SSL, reverse proxy, gzip, security headers, WebSocket support, and more — no manual editing required.
Dockerfile Linter
FILETIME & LDAP Timestamp Converter
Free online FILETIME and LDAP/Active Directory timestamp converter. Convert 18-digit Windows FILETIME to human-readable dates and back. Live clock included.
Color Space Explorer — OKLCH, OKLab, P3 & More
Free online extended color space converter. Convert between HEX, RGB, HSL, HWB, OKLab, OKLCH, Linear sRGB, and Display P3 with CSS output. No sign-up required.
Tailwind CSS Class Sorter — Organize Utility Classes
Free online Tailwind CSS class sorter. Organize utility classes following the official recommended order with duplicate removal. No sign-up required.
Benchmark Builder — JavaScript Performance Testing
Free online JavaScript benchmark tool. Compare code snippet performance with operations-per-second metrics and visual bar charts. No sign-up required.
Figma Token Converter — Design Tokens to CSS/Tailwind
Free online Figma design token converter. Transform JSON design tokens to CSS custom properties, SCSS variables, Tailwind config, or JS exports. No sign-up required.
GraphQL Playground — Schema Validator & Query Formatter
Free online GraphQL playground. Validate queries against your schema, format GraphQL queries, and inspect schema types. Works offline, no sign-up required.
네트워크
텍스트
Markdown Preview & Editor
Free online Markdown editor with live preview. Write and preview Markdown with GFM support, tables, code blocks, and more — all in your browser.
Markdown Table Generator — Free Online GFM Table Builder
Generate well-formatted GitHub Flavored Markdown (GFM) tables with an interactive visual editor. Set column alignment, add or remove rows and columns, and copy the output instantly.
Emoji Picker & Search
Free online emoji picker and search tool. Browse, search, and copy emojis by category — smileys, animals, food, symbols, flags, and more. Click any emoji to copy it to your clipboard instantly.
ASCII Text Drawer / Art Generator
Free online ASCII art text generator. Convert any text into large block letters, shadow art, or simple ASCII banners — no external libraries required.
Email Normalizer
Normalize and deduplicate email addresses by removing dots, plus aliases, and provider-specific suffixes to find canonical forms.
Unicode Character Lookup — Code Point Inspector
Free online Unicode character lookup tool. Inspect text to see code points, UTF-8/UTF-16 encoding, Unicode block, and category. Search by U+ code point. No sign-up required.
HTML WYSIWYG Editor — Rich Text to HTML
Free online WYSIWYG HTML editor. Create rich text content with formatting tools and get clean HTML output. Supports headings, lists, code blocks, blockquotes, and more. No sign-up required.
데이터 형식
JSON Formatter & Viewer — Free Online
Format, prettify, minify, and validate JSON instantly with this free online JSON formatter. Adjust indentation, sort keys, and view stats in real time.
Data Format Converter — Free Online
Convert between JSON, YAML, TOML, and CSV instantly with this free online data format converter. Swap formats with one click, no sign-up required.
JSON Schema Generator & Validator — Free Online
Generate JSON Schema from sample data or validate JSON against a schema with this free online tool. Uses Ajv for validation. No sign-up required.
CSV Viewer & Editor — Free Online
View, edit, sort, and export CSV data in a spreadsheet-like table. Supports custom delimiters (comma, tab, semicolon, pipe). Powered by PapaParse — no data leaves your browser.
SQL Formatter & Beautifier — Free Online
Format, beautify, and pretty-print SQL queries instantly. Supports MySQL, PostgreSQL, SQLite, T-SQL, PL/SQL, MariaDB, BigQuery, and standard SQL with customizable indentation and keyword casing.
Protobuf to JSON Converter
Free online Protocol Buffers (Protobuf) to JSON converter. Encode JSON to Protobuf binary and decode Protobuf binary back to JSON. Paste your .proto schema and data. No sign-up required.
이미지 & 비디오
SVG Optimizer & Viewer — SVGO Online
Free online SVG optimizer powered by SVGO. Compress SVG files, remove metadata, and preview results side-by-side. No sign-up required.
Favicon Generator — Multi-Size Icon Creator
Free online favicon generator. Upload an image to create favicons in all standard sizes (16x16 to 512x512) with HTML and manifest snippets. No sign-up required.
Image/Color Placeholder Generator
Free online placeholder image generator. Create custom colored placeholder images with text overlay in SVG or PNG format for mockups, wireframes, and prototyping.
Camera Recorder — Webcam Video Capture
Free online camera recorder. Record video from your webcam with optional audio, pause/resume, and download as WebM. No sign-up, runs in your browser.
수학
측정
Unit Converter
Free online unit converter for length, weight, area, volume, and temperature. Convert between metric and imperial units instantly.
Chronometer — Stopwatch & Countdown Timer
Free online stopwatch and countdown timer with lap tracking, millisecond precision, preset durations, and visual countdown progress bar.
ETA Calculator — Estimated Time of Completion
Free online ETA calculator. Enter total items, completed count, and elapsed time to estimate remaining time and completion time. No sign-up required.