Онлайн-инструменты для разработчиков

Formatters

Приводите код и структурированные данные к чистому и читаемому виду.

Generators

Create QR codes, barcodes, passwords, UUIDs, placeholder text and favicons in seconds.

QR Code Generator Create QR codes for links, text, Wi-Fi networks, email and phone numbers. Pick colors and size, then download PNG or SVG. Free, private, no sign-up. Barcode Generator Generate Code 128, EAN-13, EAN-8, UPC-A, Code 39, ITF-14 and other barcodes online. Customize size and text, then download PNG or SVG. Password Generator Generate strong random passwords and passphrases with your choice of length and characters. Uses your browser's secure random generator; nothing is stored. UUID Generator Generate UUID v4 and v7 identifiers in bulk, in upper or lower case, with or without hyphens. Inspect any UUID to see its version and timestamp. Random Number Generator Generate random numbers in any range, with or without duplicates, sorted or not. Uses secure randomness in your browser. Great for draws, games and testing. Lorem Ipsum Generator Generate Lorem Ipsum placeholder text by paragraphs, sentences or words, as plain text or HTML. Copy it in one click for mockups and layouts. Favicon Generator Create a favicon from an image, text or emoji. Download favicon.ico, PNG icons from 16 to 512 px, Apple touch icon and a web manifest, with the HTML to paste. JSON Schema Generator Generate a JSON Schema from sample JSON. Detects types, required fields and formats like email, uri and date-time. Draft-07 or 2020-12. Gitignore Generator Create a .gitignore file for Node, Python, Java, Go, Rails, Laravel, Unity and more, plus macOS, Windows and editor files. Combine templates. Robots.txt Generator Create a robots.txt file: allow or block crawlers, disallow paths, set crawl delay, add your sitemap, and block AI training bots. Cron Expression Generator Build and explain cron expressions in plain language and see the next run times. Edit each field or pick a common schedule.

Inspect and compare

View, validate and compare JSON and text, and test regular expressions.

JSON Viewer View JSON as a collapsible tree, search keys and values, and copy the path of any field. Handles large files; your JSON never leaves your browser. JSON Validator Validate JSON and see the exact line and column of any error. Format or minify valid JSON and get stats such as depth and key count. JSON Diff Compare two JSON documents by structure, not text. See added, removed and changed values with their paths, ignoring key order and formatting. Diff Checker Compare two texts or code files and highlight the differences line by line and word by word, in split or unified view. Private and instant. Regex Tester Test regular expressions with live match highlighting, capture groups, named groups and replace preview. Includes a quick regex cheat sheet. JSON Schema Validator Validate JSON against a JSON Schema online with Ajv. Supports draft-07, 2019-09 and 2020-12 and lists every error with its path. JSONPath Tester Test JSONPath expressions against your JSON and see matching values and their paths. Supports filters, wildcards, slices and recursive descent. YAML Validator Validate YAML and find syntax errors with the exact line and column. See the parsed result as JSON. Works with Docker Compose, Kubernetes and CI files. CSS Validator Validate CSS online: find syntax errors, unknown properties and invalid values, checked against the CSS specifications. Runs in your browser.

Visualizers

See your data and code: diagrams, graphs, charts and animated algorithms.

Mermaid Live Editor Write Mermaid code and see flowcharts, sequence, class, ER, state, Gantt and pie diagrams render live. Export SVG or PNG and share a link. JSON Visualizer See JSON as a graph of connected cards. Pan, zoom, search and click to copy paths. Export the diagram as SVG. Runs in your browser. Regex Visualizer Visualize regular expressions as railroad diagrams. See groups, alternatives, repeats and lookarounds, and test a sample string. Export SVG. CSV to Chart Paste CSV or spreadsheet cells and create bar, line, area, pie, doughnut, radar or scatter charts. Choose series and download PNG or JPG. Sorting Algorithm Visualizer Watch bubble, selection, insertion, shell, merge, quick and heap sort animate step by step. Count comparisons and swaps and compare Big-O.

Security

Hash, encrypt and test passwords, keys and signatures, all in your browser.

Password Strength Checker Test password strength privately in your browser. See estimated entropy, time to crack, common patterns found and tips to make it stronger. Random String Generator Generate random strings, API keys and tokens with secure randomness. Choose length, characters, prefix, hex or Base64URL, and how many. Bcrypt Generator Generate bcrypt password hashes with a chosen cost and check passwords against existing hashes. Runs in your browser; nothing is sent. AES Encryption Encrypt and decrypt text with AES-GCM or AES-CBC and a password. Uses the Web Crypto API with PBKDF2; nothing leaves your browser. RSA Key Generator Generate RSA public and private key pairs (2048-4096 bit) in your browser for encryption or signing. Export as PEM or JWK. HMAC Generator Generate HMAC signatures with SHA-256, SHA-384, SHA-512 or SHA-1, as hex or Base64. Ideal for verifying webhook and API signatures.

Text tools

Clean up, count, reverse, sort and convert text and lists.

Slug Generator Turn titles into clean, SEO-friendly URL slugs. Removes accents (Vietnamese, French, German and more), handles many lines at once. Markdown Preview Write Markdown with a live side-by-side preview. GitHub Flavored Markdown, tables and code blocks. Your draft is saved in this browser. Reverse Text Generator Reverse text backwards, reverse word or line order, or flip text upside down. Emoji and accents stay intact. Copy the result in one click. Comma Separator Convert a column or list to comma-separated values and back. Add quotes, wrap in parentheses for SQL IN, remove duplicates and sort. Line Counter Count total, non-empty, blank, unique and duplicated lines in text or code. Find the longest line and view numbered lines. Remove Line Breaks Remove line breaks from text copied from PDFs or emails. Keep paragraphs, join hyphenated words and collapse extra spaces. Remove Duplicate Lines Remove duplicate lines from text or lists. Keep the first or last occurrence, ignore case and spaces, sort, and show counts.

CSS and design

Colors, gradients, shadows, contrast, units and SVGs for front-end work.

PX to REM Converter Convert px to rem and rem to px with any root font size. Includes a table of common sizes and bulk conversion of whole CSS files. Color Converter Convert colors between HEX, RGB, HSL, HSV, CMYK and CSS names, with a color picker, shades and tints, and code for Android and Swift. SVG Optimizer Optimize and minify SVG files with SVGO in your browser. Remove metadata and comments, round numbers and compare before and after. CSS Gradient Generator Create linear, radial and conic CSS gradients with multiple color stops and a live preview. Start from presets and copy the CSS. Box Shadow Generator Create CSS box-shadow effects with multiple layers, inset shadows, blur, spread and opacity. See a live preview and copy the CSS. Color Contrast Checker Check the contrast ratio between text and background colors against WCAG 2 AA and AAA. Get a suggested color that passes. Flexbox Generator Build flexbox layouts visually: direction, wrap, justify, align and gap, plus grow, shrink, basis and order per item. Copy the CSS and HTML. CSS Grid Generator Create CSS grid layouts visually: set columns, rows and gaps, drag across cells to place items, and copy the CSS and HTML.

Utilities

Everyday helpers: word counts, subnets, HTTP status codes and image compression.

Word Counter Count words, characters, sentences and paragraphs as you type. See reading and speaking time, top keywords and limits for SEO titles and social posts. Subnet Calculator Calculate IPv4 network and broadcast addresses, host range, subnet mask, wildcard and usable hosts from CIDR notation, and split networks into subnets. HTTP Status Codes A searchable list of every HTTP status code, from 100 Continue to 511, with plain-language explanations of what each one means and when it is used. Image Compressor Compress and resize JPG, PNG and WebP images in your browser. Convert to WebP, set quality and max width, and download. Images are never uploaded. User Agent Parser Parse User-Agent strings to detect browser, engine, operating system, device type and CPU. Shows your own user agent instantly. URL Parser Parse a URL into protocol, host, port, path, query parameters and fragment. Edit parameters in a table and convert the query string to JSON. Chmod Calculator Calculate Linux and Unix file permissions: convert between checkboxes, octal like 755 and symbolic like rwxr-xr-x, with setuid, setgid and sticky bits.

Конвертеры

Преобразуйте разметку, стили и данные между популярными форматами.

HTML+ERB в Haml HTML+ERB в Haml доступен онлайн без установки. HTML+ERB в Slim HTML+ERB в Slim доступен онлайн без установки. HTML в JSX HTML в JSX доступен онлайн без установки. HTML в Pug HTML в Pug доступен онлайн без установки. CSS в SCSS/Sass CSS в SCSS/Sass доступен онлайн без установки. JSON в YAML JSON в YAML доступен онлайн без установки. Python 2 в 3 Python 2 в 3 доступен онлайн без установки. Unix Timestamp Converter Convert Unix timestamps in seconds, milliseconds, microseconds or nanoseconds to dates in UTC and your time zone, and convert dates back to epoch time. Number Base Converter Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36. Supports very large numbers and negative values. Case Converter Convert text to UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and more, all at once. JSON to CSV Converter Convert JSON arrays to CSV with nested objects flattened into columns. Choose the delimiter, preview the table and download a CSV that opens in Excel. CSV to JSON Converter Convert CSV or TSV to JSON in your browser. Auto-detect the delimiter, turn numbers and booleans into real types, and nest dotted headers. XML to JSON Converter Convert XML to JSON with attributes, repeated elements as arrays, and optional number and boolean detection. Runs entirely in your browser. JSON to XML Converter Convert JSON to well-formed XML. Use @-prefixed keys for attributes, arrays for repeated elements, and choose the root name and indentation. YAML to JSON Converter Convert YAML to JSON and JSON to YAML online. Supports multi-document YAML, anchors and comments, with clear error messages. JSON to TypeScript Generate TypeScript interfaces or types from JSON. Nested objects become named interfaces; optional and nullable fields are inferred. JSON to C# Class Generate C# classes or records from JSON, with System.Text.Json or Newtonsoft attributes, nullable types and List or array collections. CSV to SQL Converter Convert CSV to SQL INSERT statements and a CREATE TABLE for MySQL, PostgreSQL, SQL Server or SQLite. Column types are detected automatically. Image to Base64 Convert images to Base64 data URLs, HTML img tags, CSS background-image or Markdown. Drop, choose or paste an image; it never leaves your device. Markdown to HTML Convert Markdown to clean HTML with GitHub Flavored Markdown: tables, task lists and fenced code. See a live preview and download the HTML. HTML to Markdown Convert HTML to clean Markdown: headings, lists, links, images, code blocks and tables. Great for moving content into READMEs and docs. Curl to Code Converter Convert curl commands to Python requests, JavaScript fetch, axios, Node.js, Go and PHP code. Headers, JSON bodies, forms and auth are supported.

Кодировщики/Декодировщики

Кодируйте, декодируйте, преобразуйте и хешируйте текст или данные.

Минификаторы

Уменьшайте размер файлов без изменения поведения кода.