⚡ deftools.io

Encode text to Base64 or decode Base64 back to text. Unicode-safe, URL-safe mode, file support.

Convert text to ASCII art. Choose from multiple fonts and styles. Copy the output with one click.

Compute Unix file permissions: toggle read/write/execute for user, group, others. Get numeric, symbolic, and full chmod commands.

Encode & decode classic ciphers: Caesar, ROT13, Atbash, Vigenère, A1Z26, Morse, Binary, Hex, Rail Fence, Bacon. Live preview, deep-link, copy, history.

Build clean Conventional Commits messages with live preview, scope, breaking-change flags, footers, and gitmoji. Copy-ready output, deep-link share, and recent history.

Parse any cron expression into a human-readable schedule and preview upcoming run times.

Minify and beautify CSS instantly. Strip comments, whitespace, and redundant semicolons — or pretty-print minified CSS back to readable format. 100% client-side.

Calculate and compare CSS selector specificity. Visualizes ID, class, and element scores. Supports multiple selectors for comparison.

Convert curl commands to Python, JavaScript, and Go code.

Compare two pieces of text line by line with word-level highlighting. Shows additions, deletions, and similarity.

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes from text or files. Hex, Base64, or Base64URL output. Verify a hash against input. 100% client-side via Web Crypto + pure-JS MD5.

Encode and decode HTML entities. Convert special characters.

Live HTML/CSS/JS sandbox. Write code in three panes, see instant preview in a sandboxed iframe, capture console output, share via deep-link. 100% in-browser, nothing sent anywhere.

Quick reference for all HTTP methods. Learn what each method does, when to use it, and see code examples.

Searchable reference for all HTTP status codes (1xx–5xx). Filter by category, copy responses, see usage examples.

Generate TypeScript interfaces from JSON. Paste JSON, get typed interfaces.

Compare two JSON objects semantically. Shows added, removed, changed, and type-changed keys with full dot-path notation. Handles nested objects and arrays.

Format, validate, minify and escape JSON. Real-time as you type.

Infer a JSON Schema (Draft 2020-12) from any sample JSON. Live, configurable, 100% client-side.

Query JSON with JSONPath expressions ($.store.book[*].author, $.users[?(@.age>18)]). Inline engine, no libraries. Live results, path highlighting, sample data, deep-linking. 100% client-side.

Decode and inspect JSON Web Tokens. View header and payload.

Press any key to inspect its event properties — key, code, keyCode, location, modifiers, and friendly hotkey combo. Live modifier indicators, press history, copy-ready listener snippet, and a reference table of common key codes. Essential for building keyboard shortcuts, games, and accessible UIs. 100% client-side.

Live Markdown preview with GitHub-style rendering. Type on the left, see the result on the right.

Searchable database of MIME types and file extensions. Reverse lookup (extension → MIME), forward lookup (MIME → extensions), category filters, common-type cheatsheet, and copy helpers. 100% client-side.

Convert numbers between binary, octal, decimal, and hexadecimal. Real-time conversion.

Paste a list of numbers and get instant descriptive statistics: count, sum, mean, median, mode, range, variance, standard deviation, quartiles, IQR, outliers, skewness, kurtosis, and a live histogram — 100% in your browser.

Generate Playwright code snippets for common browser automation tasks. Supports selectors, actions, assertions, and more.

Test regular expressions with live highlighting, capture groups, replace mode, and common pattern presets.

Live viewport size, screen resolution, device pixel ratio, color scheme, orientation, network type, CPU cores, touch support, and more — everything a frontend developer needs for responsive testing. Updates in real time as you resize the window.

Parse, validate, and compare semantic versions (semver). Bump major/minor/patch, test range constraints (^ ~ > x-range), diff versions, and inspect pre-release precedence — fully client-side.

Convert titles to clean URL slugs. Unicode-aware, multi-line batch mode, custom separators.

Format and beautify SQL queries. Supports keywords, joins, subqueries.

Convert Unix timestamps (seconds or milliseconds) to human-readable dates and back. Live conversion, multiple formats, relative time, and deep-link sharing.

Inspect every character's codepoint, UTF-8/UTF-16 bytes, HTML/JS/CSS/URL escapes, and block. Detects invisible, combining, control, and zero-width characters. 100% client-side.

Encode and decode URLs, URI components, and query strings. Supports encodeURIComponent, encodeURI, and base64.

Parse any URL into its components: protocol, host, path, query params, hash. Edit fields and rebuild a URL, or share a parsed URL via deep-link.

Decode any User-Agent string into browser, engine, OS, device type, CPU architecture, and bot detection. Compare two UAs side-by-side, copy individual fields, deep-link via #ua=.

Generate UUID v4, UUID v7, NanoID, ULID and Short IDs. Bulk generate, format options, and inspect any ID to extract its timestamp. 100% client-side.

Test WebSocket connections, send messages, and view real-time responses. Supports multiple echo servers and custom endpoints.

Format, validate, minify and convert XML. Syntax-highlight, XML→JSON, stats, and tree view — all in your browser.

Convert between YAML and JSON formats. Real-time conversion.

Look up DNS records: A, AAAA, MX, NS, TXT, CNAME, SOA.

Describe your project. Get creative domain names. Check availability instantly via DNS.

View HTTP response headers for any URL.

Geolocate IP addresses. Find country, city, ISP, and more.

Check SSL certificate details for any domain.

Check domain registration and availability via RDAP.

Encrypt and decrypt text with AES-256-GCM using a passphrase (PBKDF2 key derivation) or a raw key. Portable base64 output includes salt, IV, and ciphertext. 100% client-side via Web Crypto.

Validate card numbers with the Luhn algorithm, detect brand (Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay, Maestro, MIR, Elo, Hipercard), format, mask/unmask, and generate Luhn-valid test numbers. 100% client-side — no number ever leaves your browser.

Sign data with a secret key using HMAC-SHA1/256/384/512. Generate signatures for webhooks & APIs, or verify a signature against a payload. Uses native Web Crypto — your data never leaves your browser.

Generate strong, cryptographically secure passwords, memorable passphrases, and PINs. Bulk generate, crack-time estimate, deep-link sharing.

Analyze password strength in real-time. Check entropy, common patterns.

Convert text between 14+ naming conventions: camelCase, PascalCase, snake_case, CONSTANT_CASE, kebab-case, Title Case, Sentence case, SNAKE_KEBAB, and more. Multi-line, acronym-aware, deep-link sharing, auto-save.

Convert CSV to JSON and JSON to CSV. Supports headers, custom delimiters, and nested objects.

Generate realistic test data: names, emails, phones, addresses, UUIDs.

Sort, deduplicate, number, and transform lists of lines. Sort A-Z, remove duplicates, convert to JSON/CSV arrays, and more — instantly in your browser.

Generate Lorem Ipsum placeholder text. Words, sentences, or paragraphs.

Build Markdown tables visually. Add/remove rows & columns, set alignment, import CSV, export to .md — all in your browser.

Count words, characters, sentences, reading time, keyword frequency, and readability score. Live as you type — with goals, auto-save, and export.

Create beautiful CSS box shadows with a visual editor. Copy the CSS in one click.

Check WCAG color contrast ratios for accessibility compliance (AA, AAA).

Convert colors between HEX, RGB, HSL, and named CSS colors. Pick any color and copy values instantly.

Extract dominant colors from any image. Get hex, RGB, HSL values, contrast grades, copy-all-as-CSS, deep-link settings. 100% client-side median-cut quantization.

Design CSS filter() effects visually. Adjust blur, brightness, contrast, hue-rotate, saturate, sepia, grayscale, invert and opacity with a live preview, then copy the CSS in one click.

Visually design flexbox layouts. Adjust direction, alignment, wrap, gap, and item count — copy the CSS in one click.

Create beautiful CSS gradients with a visual editor. Linear, radial, and conic. Copy CSS in one click.

Visually build CSS Grid layouts. Set columns, rows, gaps, and item placement — copy production-ready CSS in one click.

Build complex CSS transforms visually — translate, rotate, scale, skew, and perspective on X/Y/Z axes. Live 3D cube preview, copy-ready CSS, and one-click presets.

Design CSS easing curves visually. Drag control points on the bezier curve, preview live animations, and copy cubic-bezier() CSS in one click.

Create favicons from emoji, letters, or text. Export PNG (16/32/48/64/180px) and ICO.

Paste any SVG path `d` attribute and inspect it live: anchor & control points, bounding box, path length, per-command breakdown. Auto-fit viewBox, grid, copy normalized path. 100% client-side.

Convert images to Base64 Data URI for inline CSS/HTML, or decode Base64 back to a viewable image. Supports drag-and-drop, preview, copy as CSS/HTML/JSON, and re-encode to PNG/JPEG/WebP.

Resize images in your browser. Supports JPG, PNG, WebP. No upload needed.

Generate QR codes for URLs, text, WiFi, and more. Customize colors and download as PNG or SVG.

Convert SVG images to PNG format. Customizable output size.

Date math made easy: add or subtract time from a date, find the difference between two dates, count business days, and inspect a date (weekday, ISO week, day of year, quarter, days remaining).

Focus timer with work/break cycles, circular progress, audio alerts, and session tracking.

A Swiss-army random generator: random numbers in a range, dice rolls (d6, d20, custom), coin flips, and pick-N from a custom list. Optional seed for reproducible results, statistics, history, and one-click export.

Convert any time across world timezones instantly. Compare UTC, local, and 15+ major cities.

Convert between units: length, weight, temperature, area, volume, speed, digital storage, time, energy, pressure. Real-time.

Decode any 17-character Vehicle Identification Number (VIN) — manufacturer, country, model year, assembly plant, serial, with ISO 3779 check-digit verification.

Preview & generate Open Graph and Twitter Card meta tags. See how your link looks on Facebook, X, Slack, Discord.

Generate a robots.txt file with allow/disallow rules, sitemaps, and crawl-delay. Live preview, copy, deep-link, and ready-made presets (allow all, block all, block AI bots, WordPress, Shopify). 100% client-side.

Build, parse and validate UTM tracking URLs — single or bulk, 5 presets (Google Ads, Meta, Newsletter, Organic, Referral), paste-and-parse existing URLs, smart case + space normalization, deep-link sharing, 100% client-side.

Compute CSS aspect-ratio from any width × height, simplify ratios (16:9, 4:3, 1:1, …), find a missing dimension, and copy production-ready CSS/Tailwind/JSX. Live visual preview and a library of common ratios.

Visually design CSS border-radius with linked or per-corner controls, elliptical corners, and presets. Copy clean CSS instantly.

Visually design CSS clip-path shapes: polygons, circles, ellipses, and insets. Drag points on the canvas, pick from shape presets (triangle, star, arrow, hexagon, message), and copy clean clip-path CSS instantly.

Calculate IPv4 subnet details from CIDR notation: network address, broadcast, mask, wildcard, host range, usable hosts. Subnet list & VLSM split.

Calculate investment growth with compound interest: lump sum or recurring contributions, multiple compounding frequencies, inflation adjustment, effective APY, growth chart, and year-by-year breakdown — 100% in your browser.

Calculate monthly payments, total interest, and a full amortization schedule for any fixed-rate loan or mortgage. Add extra payments to see interest savings, view a balance chart, and export to CSV — 100% client-side.

Evaluate math expressions safely (no eval): arithmetic, trigonometry, logarithms, factorials, powers, roots, percentages, and constants (pi, e, tau). Supports parentheses, memory variables, and step-by-step trace — 100% client-side.

Add, subtract, multiply, and divide fractions and mixed numbers. Auto-simplifies to lowest terms, shows step-by-step work, converts between fractions, mixed numbers, and decimals — 100% in your browser.

Solve everyday percentage problems: X% of Y, what % is X of Y, percent change (increase/decrease), find the original before a percentage change. Live results, history, and shareable deep-links — 100% in your browser.

Precision metronome with Web Audio scheduling — set BPM, time signature, accent the downbeat, tap tempo, choose click sounds, and watch the beat pulse. 100% client-side, no network.

Spin a weighted random picker — enter options (one per line, optional weights), spin to draw a winner. Saves history, supports remove-after-pick, deep-link options, 100% client-side.

Convert numbers to Roman numerals and back. Supports standard notation (I, V, X, L, C, D, M) plus vinculum (overbar) for values up to 3,999,999. Live conversion with step-by-step breakdown — 100% in your browser.

Precision stopwatch with lap timing — millisecond accuracy via performance.now(), best/worst lap detection, CSV export, deep-link state, keyboard shortcuts. 100% client-side, no network.