• ASCII Art Generator Convert any text to ASCII art — choose from 10 classic fonts like Doom, Graffiti and Shadow. Adjust width, copy or export as PNG. Free.
• Aspect Ratio Calculator Calculate aspect ratios from width × height instantly. Scale dimensions with 16:9, 4:3, 21:9 presets and check HD/FHD/4K match. Free, in-browser.
• Base64 Encoder & Decoder Encode text to Base64 or decode Base64 strings instantly. Supports UTF-8, Unicode, emojis and URL-safe Base64. Fast, no data uploaded. Free.
• BMI Calculator Calculate your BMI with metric or imperial inputs. Get WHO weight category, ideal weight range and BMR estimate. Free, 100% client-side.
• Character Counter Count characters, words, sentences and lines in real time. Check if your text fits Twitter/X, Instagram, LinkedIn, SMS or Google Ads. Free.
• chmod Calculator Calculate Unix file permissions visually. Set read/write/execute for owner, group and others. Get octal code, symbolic notation and chmod command. Free.
• Color Contrast Checker Check color contrast ratios against WCAG 2.1 standards. See if foreground/background passes AA or AAA for normal and large text. Free.
• Color Format Converter Convert colors between HEX, RGB, HSL and CSS named colors. Auto-detects input, shows live preview, copy each value with one click. Free.
• Color Palette Generator Generate color palettes from any base color. Choose Monochromatic, Complementary, Triadic, Analogous or Split-Complementary. HEX/RGB/HSL + CSS.
• Countdown Timer Free countdown timer to any date and time. Add multiple countdowns, set any timezone, share via URL and get browser notifications. No account needed.
• Cron Expression Builder Build cron expressions visually. Set Every/Specific/Range/Step per field, preview the next 5 run times, validate syntax. Free, 100% client-side.
• Cron Expression Explainer Paste a cron expression and see it explained in plain English. Shows next 5 execution times, highlights syntax errors, includes presets. Free.
• CSS Border Radius Generator CSS border-radius generator with 4-corner sliders, px/% toggle and shape presets (Circle, Pill, Squircle). Live preview, one-click copy. Free.
• CSS Box Shadow Generator Generate CSS box-shadow code with a live preview. Adjust offset, blur, spread and color, stack shadows, use 8 presets. Copy CSS instantly. Free.
• CSS Clip-path Generator Create CSS clip-path shapes visually. Drag handles to edit polygons, pick circle/ellipse/inset, apply presets (triangle, star, hexagon). Free.
• CSS Flexbox Generator Build CSS Flexbox layouts visually. Control flex-direction, justify-content, align-items, gap and per-item properties. 5 presets, CSS copy. Free.
• CSS Gradient Generator Create CSS gradients interactively. Choose linear, radial or conic, add color stops, adjust angles and copy ready-to-use CSS. 10 presets. Free.
• CSS Grid Generator Build CSS Grid layouts visually. Set columns/rows with fr, px and minmax(), gaps, spans and named areas. Live preview, instant CSS export. Free.
• CSS Minifier Minify or format CSS instantly in your browser. Shows byte savings and detects vendor prefixes. No data uploaded — runs 100% locally.
• CSS Text Shadow Generator Create CSS text shadows with live preview. Stack multiple shadows, choose from 8 presets (neon, retro, fire), adjust offset, blur and color. Free.
• CSS Text Shadow Generator Generate CSS text-shadow code visually. Adjust X/Y offset, blur, color and opacity. Stack shadows for glow, neon or 3D effects. 8 presets. Free.
• CSV to JSON Converter Convert CSV to JSON instantly. Supports comma, semicolon, tab and pipe delimiters. Outputs array of objects or arrays. Free, no data uploaded.
• Date Calculator Calculate the exact difference between two dates in years, months and days. Add/subtract days, find your age or next weekday. Free, 100% client-side.
• Diff Checker Compare two texts and see exactly what changed. Line-by-line diff with word-level highlighting. Ignore whitespace or case. 100% in-browser.
• File Size Converter Convert file sizes between Bytes, KB, MB, GB, TB and KiB, MiB, GiB, TiB instantly. Includes download time calculator. Free, 100% client-side.
• Hash Generator Generate SHA-256, SHA-512, SHA-1 and MD5 hashes from text or files. Compare hashes and verify file integrity. 100% in-browser — no data sent.
• HTML Color Picker Pick any color with the browser color picker and instantly see HEX, RGB, HSL and CSS name. Saves last 12 colors as swatches. Free, in-browser.
• HTML Entity Encoder & Decoder Encode and decode HTML entities instantly. Supports named (&, <, ©, €) and numeric entities (<). Free, 100% client-side.
• HTML Formatter Format, beautify or minify HTML instantly in your browser. Choose 2-space, 4-space or tab indent. Shows byte savings. No data uploaded — runs 100% locally.
• HTML Meta Tag Generator Generate complete HTML meta tags instantly: SEO basics, Open Graph, Twitter Card and robots. Preview how your page looks in Google and social. Free.
• HTTP Status Codes HTTP status code reference — all 1xx–5xx codes plus Cloudflare and nginx extensions. Search, filter by category, copy code+name. Free, client-side.
• Image to Base64 Converter Convert any image (PNG, JPG, GIF, WebP, SVG) to Base64 or Data-URL instantly. Decode Data-URLs back. Copy HTML img-tag and CSS snippets. No upload.
• IP Subnet / CIDR Calculator Calculate subnet details from CIDR notation (e.g. 192.168.1.0/24) — network address, broadcast, first/last host, subnet mask, host count. Free.
• JavaScript Formatter & Minifier Format or minify JavaScript instantly in your browser. Configurable indentation, comment stripping, syntax checking and byte savings. No data uploaded.
• JSON Formatter Format, validate and minify JSON instantly. Shows syntax errors with line numbers. Copy to clipboard. Works entirely in your browser — no data uploaded.
• JSON Schema Validator Validate JSON data against a JSON Schema (Draft-7) in your browser. Errors shown with paths and line numbers. Powered by AJV. No upload.
• JSON to CSV Converter Convert JSON arrays to CSV instantly. Choose delimiter, toggle headers, flatten nested objects. Also converts CSV back to JSON. Free, no data uploaded.
• JWT Decoder Decode JSON Web Tokens (JWT) instantly. View header, payload and signature. Check expiry, inspect claims. 100% client-side — your token stays local.
• JWT Generator Generate signed JSON Web Tokens (JWT) online. Choose HS256, HS384, or HS512, enter your secret and payload — get a valid JWT instantly. 100% client-side.
• Keyboard Key Code Finder Press any key to see JavaScript event properties: event.key, event.code, keyCode, charCode and active modifiers. Last 10 keys saved. Free.
• Loan & Mortgage Calculator Calculate monthly loan or mortgage payments via PMT formula. Get total interest, amortization schedule and compare two scenarios. Free, 100% client-side.
• Lorem Ipsum Generator Generate Lorem Ipsum text by paragraphs, words or sentences. Choose plain text, HTML or Markdown, classic or randomized. 100% client-side.
• Markdown Editor Write Markdown and see a live HTML preview instantly. Copy HTML output, download your .md file, get word and character counts. 100% client-side.
• Morse Code Converter Convert text to Morse code or decode Morse back to text instantly. Audio playback, adjustable WPM speed and ITU character reference. Free.
• Number Base Converter Convert numbers between binary, octal, decimal and hexadecimal. Supports negative numbers and two's complement (8/16/32-bit). Free, in-browser.
• Number to Words Converter Convert numbers (0–999 billion) to English words. Supports cardinal, ordinal (first, second…) and currency mode (dollars and cents). Free, client-side.
• Open Graph Preview Preview how your page looks on Twitter/X, LinkedIn, Facebook and Discord. Enter a URL or paste HTML to check og:title, og:description and og:image. Free.
• Password Generator Generate secure passwords (8–128 chars) or diceware passphrases instantly. Choose character sets, check entropy strength. No data uploaded. Free.
• Percentage Calculator Calculate percentages instantly: find X% of a number, get percentage change, apply discounts or markups. Tip calculator included. Free, works offline.
• Pomodoro Timer Free Pomodoro timer with 25/5/15 min intervals, animated countdown ring, browser notifications and optional tick sound. Works offline, no signup.
• Px to REM Converter Convert px to rem and em with a configurable base font size. Batch conversion, rem→px reverse, Tailwind spacing reference, CSS copy. Free, client-side.
• QR Code Generator Generate QR codes for URLs, text, vCard, WiFi and email. Customize size, error correction and colors. Download PNG or SVG. Free, no signup.
• Random Number Generator Generate random numbers, decimals, unique sets, RPG dice (d6/d10/d20/d100), coin flips and picks from a custom list. Seeded mode. Free.
• Readability Analyzer Analyze text readability with Flesch Reading Ease and Flesch-Kincaid Grade Level scores. See syllable and sentence stats, reading level label. Free.
• Reading Time Calculator Calculate how long it takes to read any text. Set reading speed for normal, technical, or code content. Free, instant, browser-based — no data uploaded.
• Regex Tester Test and debug regular expressions interactively. Supports global, case-insensitive, multiline and dotAll flags. Shows matches and capture groups. Free.
• robots.txt Generator Generate a robots.txt file visually. Set Disallow/Allow for Googlebot, Bingbot or all bots. Add Sitemap URL and Crawl-delay. Free, client-side.
• Roman Numeral Converter Convert decimal numbers to Roman numerals and back. Supports 1–3999, all subtraction pairs (IV, IX, XL…), batch mode and reference table. Free.
• Slugify — URL Slug Generator Convert any text to a clean URL slug. Handles German umlauts, accented characters and special chars. Batch mode, custom separator. Free, client-side.
• Speed Converter Convert speeds between km/h, mph, m/s, knots, Mach and the speed of light. Travel time calculator, real-world references, adjustable precision. Free.
• SQL Formatter Format, indent and beautify SQL queries online. Supports SELECT, JOIN, WHERE, GROUP BY, keyword case conversion and minify mode. Free, 100% client-side.
• String Escaper & Unescaper Escape and unescape strings for HTML, JavaScript, JSON, Python, SQL, RegExp and CSV. Auto-detection, roundtrip verification. Free, client-side.
• Temperature Converter Convert temperatures between Celsius, Fahrenheit, Kelvin and Rankine. Reference points, formula display, precision control and copy-to-clipboard. Free.
• Text Case Converter Convert text between camelCase, PascalCase, snake_case, kebab-case, Title Case, Sentence case and more. Live preview, one-click copy. Free.
• Time Zone Converter Convert times between any two time zones — DST-aware, 100% client-side. Supports all IANA zones including UTC, Berlin, New York and Tokyo. Free.
• Tip Calculator Calculate tips instantly. Enter bill amount, pick a tip %, split between any number of people and round up if needed. Unequal splits supported. Free.
• Typing Speed Test Test your typing speed and accuracy online. Measures WPM, accuracy and error count. Choose 15–120 second duration and difficulty level. Free.
• Unix Timestamp Converter Convert Unix timestamps to human-readable dates and vice versa. Auto-detects seconds vs milliseconds, shows relative time and timezone output. Free.
• URL Encoder & Decoder Encode and decode URLs with percent-encoding (encodeURIComponent). Also supports Base64 encode/decode. Free, fast, 100% in-browser — no data uploaded.
• URL Parser & Debugger Parse any URL into protocol, host, port, path, query params and fragment. Edit params, encode/decode values, detect UTM patterns. Free, 100% client-side.
• UUID Generator Generate UUID v4 instantly — bulk up to 50 at once, with or without hyphens. Validate any UUID. Runs entirely in your browser — nothing uploaded.
• Word Counter Count words, characters, sentences, paragraphs and reading time instantly. Free, fast, no signup. Works entirely in your browser.
• Word Frequency Analyzer Analyze word frequency in any text. See counts and percentages, filter stop words (English/German), export as CSV. Sortable table. Free, client-side.
• XML Formatter Format, validate and minify XML instantly. Prettify with configurable indentation, check tag-balance errors or compress to one line. 100% client-side.
• YAML ↔ JSON Converter Convert YAML to JSON or JSON to YAML instantly. Auto-detects input format, supports YAML anchors and aliases, syntax validation. Free, client-side.