Guides & how-to articles
Every tool ships with a short, practical guide — generated and kept fresh automatically. 34 guides and counting.
Developer Tools
JSON Formatter & Validator: Free Online Tool & Complete Guide
Free online JSON formatter and validator. Pretty-print, minify, sort and validate your JSON instantly with a clear, human-readable error report.
4 min readBase64 Encoder & Decoder: Free Online Tool & Complete Guide
Free online Base64 encoder and decoder. Convert text to Base64 or decode Base64 to plain text instantly, with URL-safe mode and file conversion support.
4 min readURL Encoder & Decoder: Free Online Tool & Complete Guide
Free online URL encoder and decoder. Percent-encode special characters, decode malformed URLs and safely build query strings for APIs and redirects.
3 min readHash Generator (SHA-1, SHA-256, SHA-512): Free Online Tool & Complete Guide
Free online hash generator. Compute SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text or file instantly, locally in your browser with Web Crypto.
4 min readUUID v4 Generator: Free Online Tool & Complete Guide
Free UUID v4 generator. Create one or hundreds of cryptographically random version 4 UUIDs instantly, with uppercase, braces and bulk download options.
3 min readUnix Timestamp Converter: Free Online Tool & Complete Guide
Free Unix timestamp converter. Convert timestamps (seconds or milliseconds) to human-readable dates and times, or any date back to a Unix timestamp.
3 min readRegex Tester: Free Online Tool & Complete Guide
Free online regex tester. Build and test regular expressions against sample text with live match highlighting, match details and common flags.
4 min readJWT Decoder: Free Online Tool & Complete Guide
Free online JWT decoder. Inspect the header and payload of any JSON Web Token instantly — fully client-side, so sensitive tokens never leave your browser.
4 min readCSV to JSON Converter: Free Online Tool & Complete Guide
Free CSV to JSON converter. Turn spreadsheets and CSV exports into clean JSON arrays instantly, with custom delimiters and quote handling, plus JSON to CSV mode.
4 min readZIP Extractor & Viewer: Free Online Tool & Complete Guide
Free online ZIP extractor. Upload any ZIP archive and browse its contents instantly — preview text, code and images, then download individual files or extract them all, fully in your browser.
4 min readRAR & 7Z Viewer: Free Online Tool & Complete Guide
Free online RAR and 7Z viewer. Open RAR, 7Z, TAR, GZ, BZ2, XZ and ISO archives, preview text and images, and extract exactly the files you need — fully in your browser.
4 min readZIP Creator: Free Online Tool & Complete Guide
Free online ZIP creator. Bundle any files into a ZIP with per-file compression control — Deflate for text and code, Store for already-compressed media — plus a folder prefix and level slider.
4 min readText & Writing
Word & Character Counter: Free Online Tool & Complete Guide
Free word and character counter. Track words, characters (with and without spaces), sentences, paragraphs, reading time and keyword frequency in real time.
4 min readCase Converter: Free Online Tool & Complete Guide
Free case converter. Instantly convert text to uppercase, lowercase, title case, sentence case, camelCase, PascalCase, snake_case, kebab-case and more.
3 min readLorem Ipsum Generator: Free Online Tool & Complete Guide
Free lorem ipsum generator. Create realistic placeholder text as paragraphs, sentences, words or lists — with or without HTML tags — for mockups and wireframes.
3 min readText Diff Checker: Free Online Tool & Complete Guide
Free text diff checker. Paste two versions of any text and instantly see added, removed and changed lines highlighted, with change statistics.
3 min readSlug Generator: Free Online Tool & Complete Guide
Free slug generator. Convert any title, headline or phrase into a clean, SEO-friendly URL slug with lowercase letters, hyphens and optional max length.
3 min readMarkdown to HTML Converter: Free Online Tool & Complete Guide
Free Markdown to HTML converter. Write Markdown and see the rendered preview plus clean HTML output, ready to copy into any page or CMS.
3 min readAI Text Generator: Free Online Tool & Complete Guide
Free AI text generator. Create AI-style blog outlines, product descriptions, emails and social captions from a single topic — with tone control, instantly.
4 min readImages & Media
QR Code Generator: Free Online Tool & Complete Guide
Free QR code generator. Create scannable QR codes from URLs, text, Wi-Fi credentials and more — with custom colors, sizes and PNG download, fully client-side.
3 min readImage to Base64 Converter: Free Online Tool & Complete Guide
Free image to Base64 converter. Turn PNG, JPG, SVG or WebP images into Base64 data URIs for embedding in HTML, CSS or JSON — fully offline in your browser.
3 min readImage Resizer: Free Online Tool & Complete Guide
Free online image resizer. Resize PNG, JPG, WebP or GIF images by exact pixels or percentage — with aspect-ratio lock, format conversion and quality control, all in your browser.
3 min readImage Compressor: Free Online Tool & Complete Guide
Free image compressor. Reduce the file size of JPG, PNG and WebP images with a quality slider, batch processing and ZIP download — all in your browser.
4 min readPDF Tools
PDF Merger: Free Online Tool & Complete Guide
Free online PDF merger. Combine and reorder multiple PDF files into a single document in seconds — no upload, fully private in your browser.
4 min readPDF Splitter & Page Extractor: Free Online Tool & Complete Guide
Free online PDF splitter. Extract specific pages, remove pages or split a PDF into separate files per page — all private, in your browser.
4 min readSecurity & Passwords
Strong Password Generator: Free Online Tool & Complete Guide
Free strong password generator. Create secure, random passwords with adjustable length, character sets and an entropy meter — generated locally with crypto-grade randomness.
3 min readPassword Strength Checker: Free Online Tool & Complete Guide
Free password strength checker. Analyze any password locally: entropy in bits, strength score, missing character classes and estimated time to crack.
4 min readCalculators & Converters
Unit Converter: Free Online Tool & Complete Guide
Free unit converter. Convert length, weight, temperature, speed, area, volume, data storage and time between metric and imperial units with instant results.
3 min readPercentage Calculator: Free Online Tool & Complete Guide
Free percentage calculator. Find what percent one number is of another, calculate X% of Y, and compute percentage increase or decrease — with formulas shown.
3 min readAge Calculator: Free Online Tool & Complete Guide
Free age calculator. Find your exact age in years, months and days, the weekday you were born, and your next birthday countdown — instantly.
3 min readBMI Calculator: Free Online Tool & Complete Guide
Free BMI calculator. Compute your Body Mass Index from height and weight (metric or imperial), see your category and your healthy weight range.
3 min readRandom Number Generator: Free Online Tool & Complete Guide
Free random number generator. Pick random numbers within any range using crypto-grade randomness, with unique, sorted and bulk generation options.
3 min readLoan Calculator: Free Online Tool & Complete Guide
Free loan calculator. Compute monthly payments, total interest and payoff date for any loan, with a full month-by-month amortization schedule.
4 min readCurrency Converter: Free Online Tool & Complete Guide
Free currency converter. Convert between 30+ world currencies with up-to-date exchange rates, popular pair shortcuts and an instant swap button.
3 min read