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Free online HTML editor with live preview, find & replace, beautify, minify, mobile/ta…

Minify HTML to reduce file size and improve page load speed. Removes whitespace, comme…

Format, validate, and minify JSON instantly. Sort keys alphabetically, view error posi…

Encode or decode URLs and query strings. Supports component encoding, full URL encodin…

Generate RFC 4122 v4 UUIDs. Bulk generate up to 1000 at once, choose uppercase, no-hyp…

Decode and inspect JSON Web Tokens. View header, payload, expiration, issuer, and veri…

Test JavaScript regular expressions with live match highlighting, capture groups, repl…

Convert between Unix timestamps, ISO 8601, and human-readable dates. Supports millisec…

Count words, characters, sentences, paragraphs, and reading time in real-time. Top-wor…

Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-ca…

Generate Lorem Ipsum placeholder text. Choose paragraphs, sentences, or words. Optiona…

Compare two text blocks and highlight differences line-by-line with insertions, deleti…

Encode or decode text using Base64, Base64URL, Hex, Binary, URL, HTML entities, ROT13,…

Pick colors visually and convert between HEX, RGB, HSL, HSV, and CMYK. Includes WCAG c…

Generate QR codes for URLs, text, email, WiFi credentials, or phone numbers. Download …

Format and beautify SQL queries instantly. Supports PostgreSQL, MySQL, SQLite, BigQuer…

Minify CSS to shrink production bundles, or beautify minified CSS for inspection. Real…

Build, validate, and explain cron expressions in plain English. Preview the next 5 run…

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512, RIPEMD-160, SHA3-256, and SHA3-512 has…

Generate HMAC signatures using MD5, SHA-1, SHA-256, SHA-384, or SHA-512 with a secret …

Encrypt text using AES-128/256 with PBKDF2 key derivation (100k iterations). Supports …

Generate RSA key pairs (1024–4096 bit) and encrypt or decrypt with public/private keys…

Hash passwords with bcrypt at configurable rounds (4–14). Verify existing bcrypt hashe…

Generate cryptographically secure random passwords using window.crypto. 8–128 characte…

Format and validate YAML — for Kubernetes manifests, Docker Compose, GitHub Actions, A…

Pretty-print XML with proper indentation. Handles SOAP responses, RSS feeds, configura…

Convert any text to a URL-friendly slug. Strips diacritics, lowercases, replaces space…

Count word frequency in any text. See the top N words ranked, with stop-word filtering…

Type Markdown on the left, see rendered HTML on the right. Live, instant, GitHub-Flavo…

Inspect any character: code point, decimal, HTML entity, JS escape, UTF-8 bytes, UTF-1…

Calculate network details from CIDR notation: netmask, broadcast, first/last host, tot…

Generate a properly-curated .gitignore file by selecting your language, framework, OS,…

Generate time-based one-time passwords (TOTP) — the same 6-digit codes as Google Authe…

Generate realistic fake data — names, emails, addresses, phone numbers, UUIDs, dates. …

Encode any text or string to Base32 (RFC 4648), or decode Base32 back to text. Used fo…

Inspect HTTP response headers from any URL. See server, content-type, caching, and aud…

Translate text to Morse code and Morse back to text. Supports A–Z, 0–9, common punctua…

Generate random phone numbers for 8 countries (US, UK, Canada, Australia, France, Germ…

Generate random US ZIP codes, optionally filtered to a specific state. Uses real USPS …

Generate random birthdays within an age range. Multiple date formats (ISO, US, EU, lon…

Can't decide what to eat? 200+ dishes from around the world, organized by meal type. H…

Find and replace text in any document. Supports regular expressions, case sensitivity,…

Encode and decode quoted-printable (RFC 2045) — the email content-transfer encoding be…

Convert any JSON document into TypeScript interfaces. Smart array merging produces opt…

Compare two JSON documents and see exactly what changed. Semantic diff — object key or…

Paste a curl command, get the equivalent code in JavaScript fetch, axios, Python reque…

Encode and decode HTML entities (named, numeric, or hex). Supports the full HTML5 enti…

Convert CSV, TSV, or a JSON array of objects into a properly aligned Markdown table. G…

Beautify minified or messy JavaScript, JSX, JSON, CSS, SCSS, or HTML. Optional JavaScr…

Convert between Unix timestamps (seconds, milliseconds, microseconds, nanoseconds) and…

Every HTTP status code (60+) with plain-language explanation, typical use cases, and b…

Parse any User-Agent string into browser name and version, OS, device type, engine, an…

Convert an IPv4 address between dotted decimal, integer (32-bit), hex, octal, binary, …

Decode JWT header and payload, view standard claims (exp, iat, iss, sub, aud) with hum…

Generate a JSON Schema (Draft 07 or 2020-12) from any JSON document. Auto-detects form…

Validate a JSON document against a JSON Schema (Draft 07 and 2020-12). Powered by Ajv …

Evaluate JSONPath expressions (RFC 9535 / Goessner) against a JSON document. Test filt…

Convert any image (PNG, JPEG, WebP, SVG, GIF) to a base64 data URI for inline use in C…

Check color contrast against WCAG 2.1 AA/AAA thresholds and the modern APCA (WCAG 3 dr…

Convert CIDR notation to subnet mask, wildcard mask, network range, broadcast address,…

Upload one square image, get a complete favicon package: 16/32/48/180/192/512 PNGs, Ap…

Answer 4 questions and get the right open-source license for your project — MIT, Apach…

Generate a polished README.md tailored to your stack (Node, Python, Go, Rust, Ruby, PH…

Paste a cron expression — get a plain-English description, field-by-field breakdown, a…

Convert images between PNG, JPEG, WebP, and AVIF with quality control and optional res…

Break a URL into its components (protocol, host, port, path, query, fragment), edit th…

Look up A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV, and PTR records for any domain. Li…

Inspect a domain's email authentication setup: SPF policy, DKIM public keys, DMARC pol…

Paste raw email headers; get the full delivery path (Received chain with per-hop timin…

Extract all email addresses from any blob of text. Options for dedup, sort, lowercase …

Bidirectional converter between JSON arrays and CSV. Handles nested objects (flattens …

Paste a PEM-encoded certificate; see issuer, validity period with expiry countdown, Su…

Render Mermaid diagrams instantly — flowcharts, sequence, class, state, ER, Gantt, pie…

Bidirectional converter between YAML and JSON with proper handling of anchors, aliases…

Convert numbers between any base from 2 to 62. Binary, octal, decimal, hex, base 32, b…

Fetch any URL's HTTP response headers and audit them for security best practices. Show…

Bidirectional converter between Markdown and HTML. GitHub Flavored Markdown features: …

Pick a date/time in one zone, see it in every zone you care about. Add/remove zones to…

Build properly-formatted Conventional Commits messages. Type/scope/subject/body/footer…

Convert between 12 case styles: camelCase, PascalCase, snake_case, SCREAMING_SNAKE, ke…

Parse Set-Cookie or Cookie headers into readable tables. Shows all attributes (Path, D…

Convert numerical values into English words. Supports cardinal (one, two, three), ordi…

Convert between metric and imperial length units — meters, kilometers, miles, feet, in…

Convert weight and mass units — kilograms, grams, pounds, ounces, stone, and metric to…

Convert between Celsius, Fahrenheit, Kelvin, and Rankine. The only everyday conversion…

Convert area units — square meters, square feet, acres, hectares, square miles, and mo…

Convert volume and capacity — liters, milliliters, gallons, cups, fluid ounces, and cu…

Convert speed and velocity — m/s, km/h, mph, knots, and feet per second. For travel, p…

Convert time durations — seconds, minutes, hours, days, weeks, months, and years, plus…

Convert data storage units — bytes, KB, MB, GB, TB, plus the binary KiB, MiB, GiB. Han…

Convert pressure units — pascals, bar, atmospheres, psi, mmHg, and more. For weather, …

Convert energy units — joules, calories, kilowatt-hours, BTU, and electronvolts. For p…

Convert power units — watts, kilowatts, horsepower, and BTU per hour. For engines, app…

Convert angle units — degrees, radians, gradians, turns, and arcminutes/arcseconds. Fo…

Convert data transfer rates — bits and bytes per second, Kbps, Mbps, Gbps, and MB/s. D…