Free online tools for webmasters & developers

Everyday utilities for encoding, converting, formatting, generating and calculating — all free, no signup, all running locally in your browser.

Encode & Hash (6)

Base64 Encoder & DecoderEncode text to Base64 or decode Base64 back to text. Full UTF-8 support, runs entirely in yo URL Encoder & DecoderPercent-encode or decode URLs and query parameters. Choose between component mode and full U HTML Entity Encoder & DecoderConvert special characters to HTML entities (& < > etc.) or decode entities back t Hash Generator (MD5, SHA-1, SHA-256, SHA-512)Compute MD5, SHA-1, SHA-256 and SHA-512 hashes of any text at once. Commonly used for checks JWT DecoderDecode a JSON Web Token (JWT) and inspect its header, payload and expiry — without sending i ROT13 & Caesar CipherApply ROT13 or a Caesar shift of any amount to text. Letters rotate, digits and punctuation

Converters (14)

Unix Timestamp ConverterConvert Unix timestamps to human-readable dates and back. Handles both seconds and milliseco Number Base ConverterConvert numbers between binary, octal, decimal and hexadecimal — all four bases at once.Color Converter (HEX / RGB / HSL)Convert colors between HEX, RGB and HSL formats with a live preview swatch.Unit ConverterConvert length, weight, temperature, data size and speed units. Quick everyday conversions w CSV to JSON ConverterPaste CSV data and get a JSON array. Handles quoted fields, embedded commas and an optional JSON to CSV ConverterTurn a JSON array of objects into CSV. Columns are collected from all object keys automatica YAML ⇄ JSON ConverterConvert YAML to JSON and JSON to YAML, with syntax validation on both sides.Text ⇄ Binary ConverterConvert text to binary (UTF-8 bytes as 0/1) and decode binary strings back to text.URL ParserBreak any URL into protocol, host, port, path, query parameters and hash — each query parame Image to Base64 (Data URI)Convert a local image (PNG, JPG, GIF, SVG, WebP) into a Base64 data URI ready for CSS or HTM Roman Numeral ConverterConvert numbers to Roman numerals and Roman numerals to numbers, from 1 to 3999.Morse Code TranslatorTranslate text to Morse code (dots and dashes) and decode Morse back to text. Letters separa User Agent ParserPaste a User-Agent string and see the browser, version, operating system and device type ext ASCII Table ReferenceComplete printable ASCII table (32-127) with decimal, hex, octal and binary values — handy w

Text Tools (16)

Word & Character CounterCount words, characters (with and without spaces), sentences, paragraphs, lines and estimate Case ConverterConvert text to camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, Title Case and Text Diff CheckerCompare two texts line by line and see added and removed lines highlighted. Runs locally — n Regex TesterTest JavaScript regular expressions live against sample text, with match listing, groups and Sort & Deduplicate LinesSort lines alphabetically or numerically, remove duplicates, trim whitespace and drop empty Lorem Ipsum GeneratorGenerate placeholder paragraphs or sentences of classic Lorem Ipsum text for mockups and lay Slug GeneratorTurn titles into clean URL slugs — lowercase, diacritics stripped, separators normalized. Pa Unicode Character InspectorInspect every character in a string: code point, decimal, hex and HTML entity. Useful for hi Find & Replace TextReplace all occurrences in a text — plain match or full regular expression, case sensitive o Remove Line BreaksStrip line breaks from text — join everything into one line, or merge only wrapped lines whi Reverse TextReverse a string by characters, reverse word order, or flip the order of lines.Text RepeaterRepeat a string or line any number of times, with optional numbering and separator.Character & Word Frequency CounterCount how often each character or word appears in a text, sorted by frequency. Handy for cip Add Line NumbersPrefix every line with a number — configurable start value, separator and zero padding.Keyword Density AnalyzerPaste an article and see the most frequent single words and two-word phrases with their dens Readability Score (Flesch)Score your text with the Flesch Reading Ease formula and get a school-grade interpretation.

Generators (13)

UUID GeneratorGenerate one or many random UUID v4 identifiers instantly. Cryptographically strong, generat Password GeneratorCreate strong random passwords with custom length and character sets. Includes an entropy-ba QR Code GeneratorGenerate a QR code for any text, URL or Wi-Fi string and download it as PNG. Generated local Meta & Open Graph Tag GeneratorBuild SEO meta tags, Open Graph and Twitter Card tags for a page, then copy the ready-made H UTM Campaign Link BuilderAdd UTM tracking parameters to any URL for analytics campaigns. Handles existing query strin Robots.txt GeneratorBuild a valid robots.txt with allow/disallow rules, crawl-delay and sitemap reference — with Sitemap.xml GeneratorPaste a list of page URLs and generate a valid sitemap.xml with changefreq and priority. Dow Wi-Fi QR Code GeneratorLet guests join your Wi-Fi by scanning a QR code — no password typing. Generated locally, no Cron Expression ExplainerPaste a cron expression and read what schedule it describes, field by field. Supports 5-fiel Google SERP Snippet PreviewPreview how your page title, URL and description will look in Google results — with length w JSON-LD Schema Generator (Article)Generate schema.org Article structured data for rich search results. Fill the fields, copy t Hreflang Tag GeneratorGenerate a full set of reciprocal hreflang link tags for multilingual pages. One language + .htaccess Snippet GeneratorAssemble a safe .htaccess from common presets: force HTTPS, canonical host, gzip, browser ca

Format & Minify (8)

JSON Formatter & ValidatorPretty-print, minify and validate JSON with precise error reporting. Nothing leaves your bro CSS MinifierMinify CSS by stripping comments and collapsing whitespace. Also beautifies compressed CSS b XML FormatterIndent and tidy XML or HTML markup for readability, preserving text content and self-closing SQL FormatterFormat and indent SQL queries for readability. Supports common dialect keywords (SELECT, JOI Markdown PreviewerWrite Markdown on the left, see rendered HTML on the right — headings, lists, tables, code b HTML Live PreviewPaste HTML (with inline CSS/JS) and see it rendered instantly in a sandboxed frame.JSON String Escape / UnescapeEscape text to embed it safely inside a JSON string literal, or unescape an escaped JSON str HTML MinifierStrip HTML comments and collapse inter-tag whitespace. Conservative — inline text and attrib

Calculators (16)

Aspect Ratio CalculatorCompute missing width or height for a given aspect ratio, and simplify ratios to lowest term Percentage CalculatorThree everyday percentage calculations in one place: X% of Y, X is what percent of Y, and pe IPv4 Subnet Calculator (CIDR)Enter an IPv4 address with CIDR notation to get network address, broadcast, mask, usable hos Color Contrast Checker (WCAG)Check foreground/background color contrast against WCAG 2.1 AA and AAA thresholds for normal Age CalculatorCalculate exact age in years, months and days from a birth date — plus the next birthday cou Date Difference CalculatorDays, weeks, business days and full years/months between two dates.Time Zone ConverterConvert a time between any two time zones using the built-in IANA database of your browser.BMI CalculatorCompute Body Mass Index from metric or imperial inputs and see the standard WHO category.Loan / Mortgage Payment CalculatorMonthly payment and total interest for an amortized loan. Standard formula used by banks wor VAT / Sales Tax CalculatorAdd tax to a net price or extract it from a gross price — switch direction with one click.Bitwise CalculatorBitwise AND, OR, XOR and shifts on two integers, shown in decimal, hex and binary.Number to English WordsSpell out any integer up to the trillions in English words — useful for checks, invoices and Color Palette GeneratorBuild a palette from one base color: tints, shades, complementary and analogous colors — all CSS Gradient GeneratorDesign linear or radial CSS gradients visually and copy the ready-to-paste CSS. Angle and st CSS Box-Shadow GeneratorTune offset, blur, spread, color and inset visually, then copy the generated box-shadow CSS.CSS Border-Radius GeneratorSet each corner radius independently (or lock them together) and copy the resulting CSS. Liv

More tools are added regularly — bookmark this page. Planned: WHOIS / DNS / IP lookup, image compressor, cron explainer, HTTP header inspector.