125 tools.
One API key.

Check if two colors pass WCAG AA and AAA contrast requirements

Calculate the WCAG contrast ratio between two colors

Convert HSL (hue, saturation, lightness) to a hex color string

Convert a hex color to HSL (hue, saturation, lightness)

Convert RGB values to a hex color string

Convert a hex color to RGB values

Hash a password with bcrypt or verify a password against an existing bcrypt hash. Verify requires the 'hash' parameter.

URL-encode a string for safe use in URLs, or decode a percent-encoded string back to plain text.

Generate a TOTP secret and current one-time code, or compute the current code for an existing secret. Returns an otpauth URI for authenticator apps.

Generate a secure random password

Decode a JWT without verifying the signature

Encode special characters as HTML entities (e.g. & → &) or decode entities back to characters.

Generate a hex-encoded HMAC signature for a message using a shared secret.

Basic statistics per column (count, nulls, min, max, mean, unique)

Extract, reorder, or rename columns from CSV

Remove duplicate rows from CSV, keeping the first or last occurrence. Optionally deduplicate by specific columns.

Filter CSV rows where a column matches a condition. Supports equality, comparison, contains, and empty checks.

Sort CSV rows by one or more columns in ascending or descending order.

Parse CSV text to a JSON array of objects

Flatten nested JSON to dot-notation keys

Pretty-print or minify JSON

Query JSON with a JMESPath expression

Convert a JSON array (or single object) to CSV text

Convert JSON to YAML

Expand dot-notation keys back to nested JSON

Convert XML text to JSON

Convert YAML text to JSON or JSON text to YAML.

Replace null or empty values in a dict with defaults

Normalize an email address by removing dots/aliases and canonicalizing the domain

Normalize a US street address by expanding abbreviations and fixing formatting

Clamp a datetime to the nearest working hour (Mon-Fri, configurable start/end)

Parse an ICS calendar string into structured JSON events

Generate an ICS calendar event from structured input

Count business days (weekdays) between two dates

Add or subtract a given amount of time from a date and return the resulting ISO 8601 date.

Convert a date/time between timezones

Get the next N run times for a cron expression

Calculate the time difference between two dates in the chosen unit.

Reformat a date/time to a given strftime pattern

Convert a datetime to a relative human-readable string like '3 hours ago' or 'in 2 days'

Parse any date string and return ISO 8601

Convert a date string to a Unix timestamp, or a Unix timestamp to an ISO 8601 date string.

Get page count and basic metadata from a PDF

Detect MIME type from file content (magic bytes, not extension)

List contents of a ZIP archive without extracting

Convert bytes to a human-readable size string (e.g. 1048576 → '1.0 MB')

Calculate a cryptographic checksum of base64-encoded file content.

Generate an IBAN from country code, bank code, and account number

Calculate VAT amount and gross/net from a net or gross price and rate

Look up the timezone for a given latitude and longitude

Parse a freeform address string into structured components (street, city, postal code, state, country)

Calculate the distance between two lat/lng points using the Haversine formula

Add a text watermark to an image with configurable position, opacity, font size, and color.

Generate thumbnail with smart center-crop

Remove EXIF metadata from an image

Rotate image by an angle in degrees

Resize image to dimensions or percentage, optionally maintain aspect ratio

Generate a solid color placeholder image with optional text

Extract image metadata (dimensions, format, EXIF info)

Convert image to grayscale

Flip (mirror) an image horizontally or vertically.

Crop image to coordinates or center-crop to an aspect ratio

Convert an image to a different format.

Reduce image quality/file size

Adjust image brightness and contrast

Add a solid colored border around an image

Apply Gaussian blur with configurable radius

Convert between units of length, weight, temperature, speed, data, and more

Generate a random integer or float within a range

Calculate percentage: 'of' computes X% of Y, 'change' computes % change from value to total, 'what_percent' computes what % value is of total.

Round a number using banker's rounding (round half to even)

Build a DNS zone-file record string from structured parameters

Generate a valid DNS subdomain label from text (RFC 1123)

Parse raw WHOIS output into structured JSON fields

Calculate IP range, subnet mask, and host count from a CIDR block

Detect PII (emails, phones, SSNs, credit cards, personnummer) in text

Redact PII from text by masking detected patterns

Generate hashtag variants from keywords

Calculate Flesch-Kincaid Grade Level and Gunning Fog index for a block of text

Convert text between naming conventions (e.g. camelCase, snake_case, kebab-case, PascalCase, etc.).

Generate a UUID. Version 4 produces a random UUID. Version 5 produces a deterministic UUID from a namespace and name.

Encode text to Base64 or decode a Base64 string back to text.

Count characters in text broken down by type

Compare two texts and return a unified diff

Find date-like patterns in free text

Extract #hashtags from text

Extract IPv4 and IPv6 addresses from text

Find and extract embedded JSON objects or arrays from text

Extract @mentions from text

Normalize all line endings in text to a consistent style (Unix LF or Windows CRLF).

Hash text with the chosen algorithm and return the hex digest.

Generate lorem ipsum placeholder text

Convert Markdown text to HTML

Prefix each line with its line number

Estimate reading time for text at a given words-per-minute rate

Find and replace text using regex

Count words, characters, sentences, and paragraphs in text

Normalize unicode text to a standard form and optionally strip diacritical marks (accents).

Truncate text to a given length with optional ellipsis

Trim leading and trailing whitespace from each line

Convert text to title case with smart handling of small words (articles, prepositions, conjunctions)

Fill {{variable}} style placeholders in a template from a key/value map

Remove HTML tags from text, keeping text content

Convert text to a URL-friendly slug

Count sentences in text

Capitalize only the first letter of each sentence

Reverse a string or its words

Strip comments from source code. Supports Python (#), C++ (//), block (/* */), or auto-detect all styles.

Strip empty or whitespace-only lines from text

Extract regex matches from text

Validate a credit card number using Luhn algorithm and detect card type

Validate an IBAN (International Bank Account Number) and return country and formatted form

Validate an EAN/UPC barcode and verify its check digit

Generate a complete EAN/UPC barcode by computing and appending the check digit

Validate an EU VAT number format by country

Validate whether a string is a well-formed URL

Validate JSON syntax and optionally validate against a JSON Schema

Extract UTM campaign parameters from a URL

Build a URL with UTM campaign tracking parameters

Extract text, links, meta tags, and headings from HTML content

Generate a QR code image from text or URL

Read and decode QR codes or barcodes from an image

Build a URL from individual components

Parse a URL into its components

Parse a user agent string into browser, OS, and device info