Developer Tools
Free online developer tools — Base64 encoders, JSON formatters, UUID generators, JWT decoders, regex testers and more. Everything runs in your browser, no install needed.
49 tools- ASCII Table Generator 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.
- Base64 Decoder Free online Base64 decoder — decode Base64 strings back to plain text instantly in your browser. Validates input and shows decoded payload size.
- Base64 Encoder 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.
- Base64 to Image 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.
- Binary Converter Convert between binary, decimal, hexadecimal, and octal number systems in real time. Supports multi-value input and instant copy. Free, no signup required.
- Caesar Cipher Free Caesar cipher encoder & decoder — interactive cipher wheel, brute force 25 shifts, frequency analysis, step-by-step breakdown. ROT13 included.
- Case Converter Convert text to UPPER CASE, lower case, camelCase, PascalCase, snake_case, kebab-case and more — instantly in your browser.
- CHMOD Calculator Visual chmod calculator with security warnings. Set read/write/execute permissions, get octal and symbolic output instantly. Includes umask, SUID/SGID/sticky bit.
- CNPJ Generator & Validator Generate and validate CNPJ (Brazil), EIN (USA), NIPC (Portugal), CIF (Spain), Partita IVA (Italy), USt-IdNr (Germany) and SIREN/SIRET (France) for dev testing.
- SSN Generator & Validator 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 Cron expression parser and generator — paste any cron for instant description, next run times, and field breakdown. Supports Unix, Quartz, and AWS Events.
- CSS Minifier & Beautifier Minify CSS to reduce file size and boost page speed, or beautify minified CSS back to readable format. Free, instant, no sign-up required.
- CSV ↔ JSON Converter 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.
- Text Diff Checker Compare two texts and instantly see every addition, deletion, and change highlighted in color. Free, private, browser-only — no uploads, no account needed.
- Email Syntax Validator Validate any email address format instantly against RFC 5322 rules — local part, @ symbol, domain, and TLD. Free, browser-only, private.
- Enigma Machine Simulator Simulate the WWII electromechanical rotor cipher with real-time electrical signal flow, configurable rotors, plugboard, and step animation mode.
- Hash Generator 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.
- HTML Entity Decoder Decode HTML entities to plain text online — unescape <, >, &, " and all named entities instantly in your browser.
- HTML Entity Encoder Encode text to HTML entities online — escape special characters like <, >, &, and " instantly in your browser. No install needed.
- HTML to Markdown Converter Free HTML to Markdown converter with live preview and URL fetch. GitHub Flavored Markdown, configurable headings, bullets. 100% browser, no signup.
- HTTP Status Code Reference Complete HTTP status code reference — all 1xx, 2xx, 3xx, 4xx, and 5xx codes explained with meanings, use cases, and SEO impact.
- Image to Base64 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.
- IP Address Info 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.
- JSON Formatter & Validator Free online JSON formatter & validator — format, validate, minify, and export JSON to CSV. Tree view, graph view, and syntax highlighting. No install needed.
- JSON Mock Data Generator Generate realistic mock JSON data for testing and prototyping — users, products, orders, and custom schemas. Runs entirely in your browser.
- JSON Schema Validator 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.
- JSON to TypeScript Interface Instantly convert any JSON object into clean TypeScript interfaces. Free online tool — supports nested objects, arrays, and optional fields. No install needed.
- JWT Decoder Decode and inspect JSON Web Tokens instantly — view header, payload, verify HMAC signatures, and generate JWT code in PHP, JavaScript, Python, and Java.
- Lorem Ipsum Generator Generate Lorem Ipsum placeholder text in 6 flavors. Choose paragraphs or words, set quantity, and copy instantly. No sign-up required.
- Markdown Editor Online Online markdown editor with live preview. Type markdown on the left, see the rendered output instantly. Export as HTML or .md, share via link.
- Markdown to HTML Converter Free Markdown to HTML converter with live split-pane preview. GFM tables, task lists, sanitized output, rendered visual preview. No login required.
- Morse Code Translator 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.
- Password Generator Generate secure random passwords with custom length, uppercase, lowercase, numbers, and symbols. Strength meter included — 100% in your browser, no signup.
- QR Code Generator 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.
- Regex Tester Test, debug and validate regular expressions in real time with match highlighting, capture group inspection, and flag support. Free, no signup.
- Reverse Text - Mirror, Flip, Backwards & Palindrome Checker Free reverse text generator: reverse characters, mirror text, flip text, apply ROT13, and check palindromes instantly with real mirror preview.
- Roman Numeral Converter — Dates and Tattoo Preview Free Roman numeral converter: convert any number, date, or year with step-by-step breakdown, tattoo-ready date formats, and strict reverse conversion.
- SQL Formatter & Beautifier 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.
- SVG Optimizer Free online SVG optimizer — remove editor metadata, comments, and reduce path precision from Figma and Illustrator exports. 100% in-browser, no signup.
- Text Repeater - Repeat Text, Words & Emojis Online Free Free text repeater online with separators, text bombs, emoji support, auto-increment, A/B alternation and WhatsApp splitter for long messages.
- Timestamp Converter Convert Unix epoch timestamps to human-readable dates and back. Supports seconds, milliseconds, ISO 8601, timezones, and live clock.
- Timezone Converter 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.
- URL Decoder Decode any percent-encoded URL or string back to plain text instantly in your browser. Follows RFC 3986. Free, no sign-up required.
- URL Encoder Encode any URL or text to percent-encoding instantly in your browser. Follows RFC 3986. Free, no sign-up required.
- User Agent Generator Free online User Agent Generator. Create custom UA strings for Chrome, Firefox, Safari, Edge, bots & mobile devices instantly. No signup required.
- User Agent Parser Parse any user agent string instantly. Detect browser, operating system, device type, and rendering engine — free, online, no installation needed.
- UUID Generator 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.
- XML Formatter & Beautifier 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.
- YAML ↔ JSON Converter 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.
