Tools for
developers & creators

Free ASCII table generator — create plain-text tables in MySQL, Markdown, Unicode and more styles. Paste CSV or type data, copy output in one click. No signup.

Free online Base64 decoder — decode Base64 strings back to plain text instantly in your browser. Validates input and shows decoded payload size.

Encode any text or string to Base64 instantly in your browser. Supports UTF-8, shows character count and output payload size. Free, no signup, 100% client-side.

Paste a Base64 string or data URL and instantly preview the decoded image — free online converter supporting PNG, JPEG, WebP, GIF, SVG. No upload, runs locally.

Convert between binary, decimal, hexadecimal, and octal number systems in real time. Supports multi-value input and instant copy. Free, no signup required.

Free Caesar cipher encoder & decoder — interactive cipher wheel, brute force 25 shifts, frequency analysis, step-by-step breakdown. ROT13 included.

Convert text to UPPER CASE, lower case, camelCase, PascalCase, snake_case, kebab-case and more — instantly in your browser.

Visual chmod calculator with security warnings. Set read/write/execute permissions, get octal and symbolic output instantly. Includes umask, SUID/SGID/sticky bit.

Generate and validate CNPJ (Brazil), EIN (USA), NIPC (Portugal), CIF (Spain), Partita IVA (Italy), USt-IdNr (Germany) and SIREN/SIRET (France) for dev testing.

Generate and validate SSN (USA), CPF (Brazil), NIF (Portugal), DNI (Spain), Codice Fiscale (Italy), Steuer-IdNr (Germany) and NIR (France) for dev testing.

Cron expression parser and generator — paste any cron for instant description, next run times, and field breakdown. Supports Unix, Quartz, and AWS Events.

Minify CSS to reduce file size and boost page speed, or beautify minified CSS back to readable format. Free, instant, no sign-up required.

Convert CSV to JSON or JSON to CSV instantly in your browser. Paste your data, choose the direction, and download the result. Free, private, no signup.

Compare two texts and instantly see every addition, deletion, and change highlighted in color. Free, private, browser-only — no uploads, no account needed.

Validate any email address format instantly against RFC 5322 rules — local part, @ symbol, domain, and TLD. Free, browser-only, private.

Simulate the WWII electromechanical rotor cipher with real-time electrical signal flow, configurable rotors, plugboard, and step animation mode.

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32 hashes instantly in your browser. Free online hash tool — no install, no sign-up, 100% client-side.

Decode HTML entities to plain text online — unescape <, >, &, " and all named entities instantly in your browser.

Encode text to HTML entities online — escape special characters like <, >, &, and " instantly in your browser. No install needed.

Free HTML to Markdown converter with live preview and URL fetch. GitHub Flavored Markdown, configurable headings, bullets. 100% browser, no signup.

Complete HTTP status code reference — all 1xx, 2xx, 3xx, 4xx, and 5xx codes explained with meanings, use cases, and SEO impact.

Upload any image and convert it to a Base64 data URL ready for HTML, CSS, or JSON — free online converter supporting PNG, JPEG, SVG, WebP. No server upload.

See your public IP, location, ISP, and ASN instantly. Includes WebRTC leak test, browser fingerprint, subnet/CIDR calculator, and IPv4↔IPv6 converter. Free, no signup.

Free online JSON formatter & validator — format, validate, minify, and export JSON to CSV. Tree view, graph view, and syntax highlighting. No install needed.

Generate realistic mock JSON data for testing and prototyping — users, products, orders, and custom schemas. Runs entirely in your browser.

Free online JSON Schema Validator — validate JSON data against any schema (Draft-07, 2019-09, 2020-12) instantly in your browser. No install, no sign-up.

Instantly convert any JSON object into clean TypeScript interfaces. Free online tool — supports nested objects, arrays, and optional fields. No install needed.

Decode and inspect JSON Web Tokens instantly — view header, payload, verify HMAC signatures, and generate JWT code in PHP, JavaScript, Python, and Java.

Generate Lorem Ipsum placeholder text in 6 flavors. Choose paragraphs or words, set quantity, and copy instantly. No sign-up required.

Online markdown editor with live preview. Type markdown on the left, see the rendered output instantly. Export as HTML or .md, share via link.

Free Markdown to HTML converter with live split-pane preview. GFM tables, task lists, sanitized output, rendered visual preview. No login required.

Free online Morse code translator: convert text to Morse and back, play audio with WPM control, watch the visual flash, tap on keyboard, and learn with the quiz.

Generate secure random passwords with custom length, uppercase, lowercase, numbers, and symbols. Strength meter included — 100% in your browser, no signup.

Generate custom QR codes for URLs, Wi-Fi, contacts, SMS and email. Free QR code generator with logo, colors and SVG download. No login, no watermark.

Test, debug and validate regular expressions in real time with match highlighting, capture group inspection, and flag support. Free, no signup.

Free reverse text generator: reverse characters, mirror text, flip text, apply ROT13, and check palindromes instantly with real mirror preview.

Free Roman numeral converter: convert any number, date, or year with step-by-step breakdown, tattoo-ready date formats, and strict reverse conversion.

Free SQL formatter and beautifier online. Paste your SQL, pick your dialect and style, and get clean readable SQL instantly — 100% client-side, no data sent.

Free online SVG optimizer — remove editor metadata, comments, and reduce path precision from Figma and Illustrator exports. 100% in-browser, no signup.

Free text repeater online with separators, text bombs, emoji support, auto-increment, A/B alternation and WhatsApp splitter for long messages.

Convert Unix epoch timestamps to human-readable dates and back. Supports seconds, milliseconds, ISO 8601, timezones, and live clock.

Free timezone converter: convert time zones, find the best meeting time with a visual heatmap, share a meeting link, and convert Unix timestamps. DST-aware.

Decode any percent-encoded URL or string back to plain text instantly in your browser. Follows RFC 3986. Free, no sign-up required.

Encode any URL or text to percent-encoding instantly in your browser. Follows RFC 3986. Free, no sign-up required.

Free online User Agent Generator. Create custom UA strings for Chrome, Firefox, Safari, Edge, bots & mobile devices instantly. No signup required.

Parse any user agent string instantly. Detect browser, operating system, device type, and rendering engine — free, online, no installation needed.

Generate UUID v4, v7, v1, v3, v5 or v6 instantly in your browser. RFC 4122 / RFC 9562 compliant. Bulk generation, session history, and one-click copy.

Free XML formatter, validator, and beautifier online — format, minify, tree view, XPath query, XML diff, and convert to JSON/CSV. 100% client-side, no signup.

Convert YAML to JSON or JSON to YAML instantly in your browser. Paste your config or data, choose the direction, and copy the result. Free, no sign-up required.

Calculate your exact age online — get years, months, days, total days lived, and next birthday countdown. Free, instant, no sign-up required.

Extract audio from any video file as MP3, WAV, AAC or OGG — 100% browser-based, no upload to any server, no file size limits, completely free.

Free online interval timer — HIIT, Tabata, boxing & gym presets. Multi-phase sequences with loops. Countdown to any event with a shareable link. No signup.

Calculate days between any two dates: results in days, weeks, months & years. Business days with national holidays, milestone finder & date math. Free, no signup.

Convert numbers to words for checks, legal documents, and invoices. Currency mode, ordinal numbers, visual check preview, 6-language output. Free, no signup.

Free Pomodoro timer with YouTube music, ambient sounds, task list with Pomodoro estimates, and focus stats — all without signup.

Free online stopwatch with lap timer — record split times, track fastest and slowest laps, export to CSV. No ads, no signup required.

Convert units instantly — length, weight, temperature, volume, area and speed. Free online converter: m, km, mi, ft, kg, lb, °C, °F, L, gal and more.

Free color contrast checker — verify WCAG 2.2 AA and AAA compliance instantly. Live preview, color blindness simulation, and accessible color suggestions....

Convert colors between HEX, RGB, HSL, and CMYK instantly. Free online color picker with WCAG contrast checker and palette generator.

Generate harmonious color palettes from any base color. Choose Analogous, Complementary, Triadic or Tetradic harmony — export as CSS variables or JSON.

Extract color palettes from any image — get HEX, RGB, HSL codes and export as CSS variables, Tailwind config, JSON, or PNG. 100% client-side, no upload.

Free CSS box shadow generator with live preview. Build shadows, neumorphism, glassmorphism effects. Export to CSS, Tailwind, or CSS variables. No signup.

Free CSS gradient generator: create linear, radial, conic & mesh gradients with live preview. oklch mode, Tailwind export, 50+ presets. No signup required.

Create AI-ready DESIGN.md files for Google Stitch, Claude Code, Cursor, and Copilot — define colors, typography, spacing, and components for AI tools.

Free hex color picker — select any color visually and get HEX, RGB, HSL, HSV, and CMYK codes. Generate shades, tints, and color harmonies. No signup required.

Free image comparison tool — side by side, before/after slider, pixel diff highlight, and overlay fade. 100% browser-based, no upload, no signup required.

Free online image compressor — reduce JPEG, PNG, and WebP file sizes without visible quality loss. 100% browser-based, no upload to any server, no signup.

Free image resizer online — resize by pixels or percentage, lock aspect ratio, convert to WebP, JPEG or PNG. 100% browser-based, no upload required.

Calculate your BMI (Body Mass Index) instantly. Free online BMI calculator for adults, men and women. Supports metric (kg/cm) and imperial (lb/in) units.

Calculate compound interest with year-by-year breakdown — enter principal, rate, period, and monthly contributions. Free online compound interest calculator.

Free currency converter with live exchange rates, 7-day trend, and conversion history. Shows mid-market rates from the ECB. No signup.

Free discount calculator: get final price, savings & discount % instantly. Reverse mode, stacked discounts, and compare up to 3 offers side by side. No signup.

Free loan calculator: compute monthly payments, total interest, and a full amortization schedule. Supports Brazilian Price & SAC systems. No signup.

Calculate monetary correction using Brazil's main inflation indices — IPCA, IGP-M, INPC, SELIC, CDI, and Taxa Legal. Free, updated daily via BCB.

Free percentage calculator: find X% of Y, calculate percent change, increase/decrease, and add or subtract a percentage from any number. Instant results.

Free receipt generator — create payment, rent, donation and sale receipts as PDF. No signup, 100% browser-based. Your data never leaves your device.

Calculate return on investment instantly — simple ROI, annualized ROI, CAGR, and payback period for any investment. Free, no signup.

Free savings goal & retirement calculator — enter your goal, current savings, interest rate, and timeline to see exactly how much to save per month.

Calculate tip amount and split the bill instantly. Enter your bill, choose a tip percentage, and split between any number of people — free, mobile-friendly.

Generate complete HTML meta tags instantly: title, description, robots, canonical, Open Graph, and Twitter Cards. Copy-paste ready HTML output.

Paste your text or enter a word count to instantly calculate reading time for silent reading, aloud, and audiobook narration. Free, no sign-up.

Free SERP preview tool: simulate how your title, description and URL appear in Google search — desktop, mobile, rich snippets, A/B variants & social preview.

Free online word counter — count words, characters, paragraphs and reading time instantly. Detailed text analysis with keyword density.

Free word frequency analyzer — count word occurrences, check keyword density, analyze bigrams & trigrams, and measure vocabulary diversity. 100% client-side.

Free online coin flip simulator — instant, fair, and truly random heads or tails every time. No signup, no app required.

Free online dice roller for D&D and tabletop RPGs — roll d4, d6, d8, d10, d12, d20, d100 with modifiers, advantage rolls, presets, and roll history.

Generate random lottery numbers instantly for Mega-Sena, Powerball, Mega Millions, EuroMillions and more. Free, no sign-up, no repeat numbers.

Generate lists of up to 10,000 random numbers. Export as CSV, JSON, or TXT. Decimal mode, shuffle, no duplicates. Free, cryptographically secure, no sign-up.

Pick a random name from your list in seconds. Free online random name picker — perfect for giveaways, classroom draws, raffle winners, and team selection.

Pick a random number instantly — perfect for raffles, lottery, and dice rolls. Session history and entropy stats. Free, cryptographically secure, no sign-up.

Free custom wheel spinner — add your own options, spin, save multiple wheels without an account, and share a link. Templates included.