All our tools

COLORS

Colors never used

easily convert RGB, HSL and HEX colors to every common format. Just type your color values and the tool gives back the equivalents instantly, perfect for design and front-end work

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Color extractor never used

extract the dominant colours from an image and build a ready-to-use harmonious palette (HEX, RGB, HSL). Ideal to derive a brand style or draw inspiration from a photograph

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Color palette never used

builds harmonious color palettes given the number of colors and the harmony rule (complementary, analogous, triadic, etc.).

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Color picker never used

gets the exact color of a pixel from your image (RGB, HSL, hexadecimal) by clicking the spot of your choice

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CONVERSION

Html > latex never used

easily converts HTML to LaTeX while producing a polished PDF. Supports several LaTeX document classes (article, letter) and the most common HTML tags. Perfect when you want a high-quality output for your documents.

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Json > yaml never used

convert JSON to YAML (and back) while preserving the structure, with configurable indentation. Useful to migrate a configuration between .json and .yaml files

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Latex > html never used

converts your LaTeX source into HTML, perfect for publishing articles, equations and academic documents on the web

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Number base never used

convert a number from one base (decimal, binary, octal, hexadecimal) into the others, ideal for low-level programming, debugging and data analysis.

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CRON

Cron builder never used

build a cron expression from UI fields or a preset (every minute, hourly, daily, weekly...)

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Cron never used

parses a cron expression and lists the next execution dates

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DEV TOOLS

Regex tester never used

test a regular expression (regex) against a text and display matches and captured groups

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Uuid never used

generates UUIDs (Universally Unique Identifier) in v1, v4, v5 (deterministic) or v7 (time-ordered), compliant with RFC 4122

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ENCODING

Image decoder (base64) never used

rebuilds your image from its Base64 representation, useful when you need to extract assets out of a HTML or CSS Data URI

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Image encoder (base64) never used

converts your images into Base64 strings, perfect for embedding pictures directly inside HTML or CSS without an extra HTTP request

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Pdf decoder (base64) never used

rebuilds the PDF file from its Base64 representation, ready for direct download

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Pdf encoder (base64) never used

converts a PDF to a Base64 / Data URI string, perfect for embedding a document directly inside HTML, JSON or an email

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Text decoder (base64) never used

turns a Base64 string back into the original text, perfect for inspecting tokens, payloads and config files

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Text encoder (base64) never used

turns any UTF-8 or ASCII text into Base64, ideal for systems that only accept ASCII payloads

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FORMATTING

Css never used

formats your CSS rules to make them readable and easy to maintain

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Json diff never used

compare two JSON structures and list additions, removals and modifications, key by key

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Json never used

turns JSON into a readable, structured form, perfect for inspecting REST API responses, configs and logs

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Json validator never used

checks the syntax of a JSON string and reports the line and column of any error

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Markdown never used

converts your Markdown to HTML and displays a live preview, ideal for writing READMEs, documentation or articles

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Sql never used

formats your SQL queries to make them readable and easy to maintain

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Xml never used

formats XML in a structured, readable way - essential when inspecting data exchanges

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HASHING

File hash / checksum never used

compute the checksum of a file in MD5, SHA-1, SHA-256 or SHA-512. Useful to verify the integrity of a download or detect tampering

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Text hash / checksum never used

hash a string with the main algorithms (MD5, SHA-1, SHA-256, SHA-512, bcrypt, Argon2id). Useful for storing passwords or signing data in a non-reversible way

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Hash identifier never used

identifies the most likely algorithm behind a hash (MD5, SHA-1, SHA-256, bcrypt, Argon2...) from its length and format, and tries to recover the plain text via a dictionary of common passwords

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IMAGE

Image compressor never used

compresses images to drastically reduce file size while keeping high visual quality, optimizing web performance and storage

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Image never used

generate a customisable placeholder image (dimensions, background colour, text) in PNG, perfect for mockups, wireframes and web or print prototypes

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Business card never used

Easily build printable business cards by repeating one card across an A4 or A3 sheet. Optimize printing and ease cutting.

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JWT

Jwks never used

inspect a JWK Set (JSON Web Key Set) and extract each public key as PEM, ready to use to verify the JWT signatures of an identity provider (OIDC, Auth0, Keycloak…)

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Jwt builder never used

builds a signed JWT (HS256, HS384, HS512) from a JSON payload and an HMAC secret, ready for API testing or authentication tokens

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Jwt decoder never used

decodes a JSON Web Token and shows its header and payload in a readable, structured form

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Jwt verifier never used

verifies the signature of a JWT (HS256, HS384, HS512, RS256, RS384, RS512) using a secret or a public key, and inspects its claims

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QR

Qr code never used

instantly generate a QR Code (PNG, SVG, WebP or GIF) from a URL, text, wifi or contact. Customise the colours, embed your logo at the centre and pick between square or round modules

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Qr reader never used

instantly decode the content of a QR code from an image (PNG, JPG, GIF, WebP or BMP). Handy to check what was encoded before printing or to extract the text from a QR received as an attachment

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TEXT

Mock data generator never used

generate N JSON records that match a simple schema using Faker (fr_FR or en_US locale)

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Password never used

generate strong random passwords (CSPRNG) from 4 to 1024 characters, with fine-grained control over character classes: uppercase, lowercase, digits and symbols

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Lorem ipsum never used

quickly generates dummy or placeholder text, given a target character count

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Frequently asked questions

Is this tool really free?

Yes, every CDRN tool is free, no signup, no ads, no usage limits.

Is my data sent to a server?

Your data only leaves your browser when strictly required by the computation. No personal data is stored, shared or used for tracking.

Do I need an account to use the tool?

No, every tool is usable instantly, with no signup and no profiling cookies.

Is the source code public?

Yes, CDRN is a French project maintained by ARDNTECH; every tool relies on well-known, auditable open-source libraries.