Free Online Tools for Developers & Everyone

Count words, characters, sentences, paragraphs and reading time instantly.

Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case, PascalCase and more.

Turn any title into a clean, SEO-friendly URL slug.

Count characters, letters, digits and spaces in your text in real time.

Count total, non-empty, empty and unique lines in any block of text.

Count paragraphs, sentences and words, with average words per paragraph.

Delete repeated lines from a list while keeping the first occurrence.

Sort lines alphabetically, numerically, by length, or shuffle them.

Reverse text by characters, flip word order, or reverse line order.

Strip blank lines from text, or collapse multiple blanks into one.

Generate random strings from letters, digits, symbols and spaces.

Generate placeholder lorem ipsum paragraphs, sentences or words instantly.

Convert a JSON array of objects into CSV ready for any spreadsheet.

Convert CSV data into a clean JSON array of objects.

Convert JSON into clean, indented XML with a custom root element.

Convert XML into clean, structured JSON in your browser.

Convert YAML config into JSON instantly in your browser.

Convert JSON into clean, readable YAML in your browser.

Convert comma-separated values to tab-separated values online.

Convert tab-separated values to comma-separated values online.

Convert CSV rows into clean, well-formed XML elements.

Flatten repeated XML elements into a CSV table.

Convert CSV to a real .xlsx Excel workbook you can download.

Convert an .xlsx Excel workbook to CSV without uploading it.

Convert a JSON array of objects into a real .xlsx Excel workbook.

Convert XML into clean, readable YAML online.

Convert YAML into well-formed XML online.

Convert Markdown to clean HTML with a live preview.

Convert HTML into clean, readable Markdown online.

Beautify, minify and validate JSON, with color highlighting and string ⇄ JSON conversion.

Encode text to Base64 (or URL-safe base64url) instantly, with full Unicode support.

Decode Base64 (standard or URL-safe) back to readable UTF-8 text, padding optional.

Convert an image to a Base64 data URI, raw Base64, or a CSS background snippet.

Decode a Base64 string or data URI back into an image you can preview and download.

Percent-encode text for safe use in URLs, query strings and forms — instantly and in your browser.

Decode percent-encoded URLs and query strings back into readable text — fast and private.

Break any URL into its parts — protocol, host, port, path, query parameters and fragment.

Pull every link out of any text, HTML or log — with optional dedupe and sorting.

Check whether JSON is valid and pinpoint the error if it is not.

Compress JSON to a single line by stripping all whitespace.

Indent and beautify JSON with 2 spaces, 4 spaces or tabs.

Escape text into a JSON string literal, or unescape it back.

Compare two JSON documents semantically and list every difference.

See a line-by-line diff between two JSON documents.

Explore JSON as a collapsible, color-coded tree.

Create strong, random passwords with adjustable length and character sets.

Generate one or many random version-4 UUIDs instantly.

Check whether a string is a valid UUID and see its version and variant.

Decode a UUID's version, variant and embedded timestamp.

Convert Unix timestamps to dates and back, in seconds or milliseconds.

Generate random integers in any range, with optional unique values and sorting.

Generate random strings of any length from letters, numbers and symbols.

Generate realistic fake test data — names, emails, addresses and more — as JSON, CSV or SQL.

Create a custom QR code for any URL or text and download it as a PNG.

Generate CODE128, EAN, UPC and other barcodes and download them as SVG.

Convert HEX color codes to RGB and HSL with a live preview.

Convert RGB color values to a HEX code, with HSL and a live preview.

Convert a HEX color code to HSL, with RGB and a live preview.

Convert HSL values to a HEX color code, with RGB and a live preview.

Convert RGB color values to HSL, with HEX and a live preview.

Convert HSL values to RGB, with HEX and a live preview.

Pick a color and copy it as HEX, RGB or HSL instantly.

Build linear and radial CSS gradients visually and copy the code.

Calculate your Body Mass Index in metric or imperial units.

Work out an exact age in years, months and days from a birth date.

Find a percentage of a number, a ratio as a percent, or a percent change.

Find the sale price and amount saved from a price and discount percent.

Add or remove VAT and see the net, VAT and gross amounts.

Count the time between two dates in years, months, days and more.

Add or subtract durations in hours, minutes and seconds.

Calculate a weighted grade point average from courses and credits.

Estimate the monthly payment, total interest and cost of a loan.

Estimate a monthly mortgage payment from price, down payment, rate and term.

Convert characters to HTML entities so text displays instead of rendering.

Turn HTML entities back into the characters they represent.

Escape the five reserved HTML characters to safely show text as text.

Shrink HTML by stripping comments and unnecessary whitespace.

Reformat minified or messy HTML into clean, indented markup.

Shrink CSS by removing comments, whitespace and redundant characters.

Reformat minified or messy CSS into clean, indented rules.

Compress JavaScript with Terser — shorter names, no whitespace, same behaviour.

Reformat minified or messy JavaScript into readable, indented code.

Convert Unix timestamps to dates and back, in any unit.

See the current Unix time and convert epoch seconds to a date.

Convert a date and time between any two time zones.

Add or subtract days, weeks, months and years — or find the gap.

Count down the days, hours, minutes and seconds to any moment.

Hash text with MD5, SHA-1, SHA-256, SHA-384 and SHA-512 — all at once.

Generate the SHA-256 hash of any text, instantly and locally.

Generate the MD5 hash of any text, instantly and locally.

Test regular expressions live with match highlighting, capture groups and every JavaScript flag.

Build common regular expressions from ready-made presets, with explanations and a live tester.

Decode a JSON Web Token to read its header and payload as formatted JSON — entirely in your browser.

Build and sign an HS256 JSON Web Token from your header, payload and secret — all in the browser.

Decode a JWT, read humanized claims with expiry status, and optionally verify the HS256 signature.

Generate a SHA-1 hash from any text instantly, right in your browser.

Generate a 512-bit SHA-512 hash from any text instantly in your browser.

Hash passwords with bcrypt and an adjustable cost factor, locally in your browser.

Check whether a plaintext password matches a bcrypt hash, locally in your browser.

Check whether a URL slug is clean, valid and SEO-friendly.

Generate SEO meta tags — title, description, robots and more.

Generate Open Graph and Twitter Card tags for rich social shares.

Build a valid robots.txt to control how search engines crawl your site.

Turn a list of URLs into a valid XML sitemap for search engines.

Create a rel=canonical link tag to prevent duplicate content issues.