Development tools

Convert a color between HEX, RGB, HSL and CMYK instantly, with a live preview.

Check the contrast ratio between two colors and whether it meets WCAG AA and AAA accessibility levels.

Format, validate and minify JSON, with clear error messages that point to exactly where it broke.

Automatically fix single quotes, unquoted keys, trailing commas or comments in broken JSON.

Convert between JSON and YAML in both directions, with syntax validation before showing the result.

Convert a JSON array to JSON Lines (NDJSON, one object per line) and back.

Convert between JSON and TOML in both directions, conforming to the TOML 1.0.0 spec.

Convert between XML and JSON in both directions, with attributes and arrays represented clearly.

Encode and decode Base64 text, with real Unicode and emoji support.

Encode and decode URLs and parameters with encodeURIComponent/encodeURI.

Build a campaign URL with UTM parameters (source, medium, campaign, term, content) for Google Analytics.

Remove tracking parameters (UTM, fbclid, gclid...) from a URL, choosing which ones to remove.

Break down a URL into protocol, hostname, port, path, query parameters, and fragment.

Turn a title into a clean URL slug, with no accents and lowercase.

Decode a JWT's header and payload to read its data; it doesn't verify the signature or the token's validity.

Look up an HTTP status code (200, 404, 500...) and find out what it means.

Look up a file extension or a MIME type and find its equivalent.

Convert Unix/Linux permissions between numeric (755) and symbolic (rwxr-xr-x), and generate the command.

Calculate the network address, mask, broadcast, and usable hosts from an IP and a CIDR prefix.

Generate random UUID v4 identifiers with crypto.randomUUID(), one at a time or in batches.

Convert between a Unix timestamp and a readable date, showing the result in both UTC and your local time.

Convert a time between two time zones, with daylight saving time applied automatically.

Build and understand 5-field cron expressions, with presets, a plain-English explanation, and next run times.

Test a regex against text, with g/i/m/s flags and match highlighting.

Compress or decompress text with GZIP in your browser, as Base64 or hex, or by uploading a .gz file.

Compute the MD5, SHA-1, SHA-256 or SHA-512 hash/checksum of a text in your browser — nothing uploaded to any server.

Convert a JPG, PNG, WebP, GIF, BMP or AVIF image to Base64 (Data URL), ready to paste into CSS, HTML or JSON.

Decode a Data URL or Base64 text and download the resulting image, with a live preview.

Generate random passwords or a memorable multi-word passphrase, with crypto.getRandomValues.

Analyze a password's strength: length, diversity, repetitions, sequences and an approximate crack-time estimate.

Generate one or several random numbers between a minimum and a maximum, with or without repeats, excluding numbers if needed.

Generate a QR code for a URL, text, email, phone, SMS, or a contact (vCard), with adjustable size and error correction.

Generate an EAN-13, EAN-8, UPC-A or ITF barcode with an automatic check digit.

Generate a QR code that connects automatically to your WiFi network, without typing the password by hand.

Convert a decimal number to binary instantly, with no practical size limit.

Convert between binary, octal, decimal and hexadecimal, in any source/target combination.

Format minified or messy HTML, including embedded CSS and JavaScript, with Prettier.

Format a SQL query with readable indentation, choosing the dialect (MySQL, PostgreSQL, SQL Server...).

Convert a number or an amount in euros, pesos or dollars into its written English form, with cents and check/invoice formatting.

Paste HTML and see it rendered in a safe, isolated preview panel, without executing any script.

Explore an XML's structure as an expandable tree, with formatting and download.

Evaluate an XPath expression against XML and check which nodes it selects.

Evaluate a JSONPath expression against JSON and check which values it selects, with each match's path.

Check whether an XML is well-formed, with the error explained clearly.

Convert a pasted CSV or a CSV/Excel file to JSON, using the header row as each property's name.

Convert an array of JSON objects to CSV, ready to open in Excel or Google Sheets.