All our tools

CONVERTER

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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Cron never used

parses a cron expression and lists the next execution dates

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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 your JSON to YAML and back, keeping the structure intact

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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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ENCODER / DECODER

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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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 code never used

turns your data into a QR code

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IMAGE

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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TEXT

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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EXTRACTOR

Color extractor never used

builds a color palette from any image you upload.

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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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FORMATTER

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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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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GENERATOR

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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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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Cron builder never used

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

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Image never used

generates a simple placeholder image to drop inside your mockups

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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

generates secure random passwords matching your criteria - length, character classes (letters, digits, symbols)

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Lorem ipsum never used

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

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Uuid never used

generates random UUIDs (Universally Unique Identifier) compliant with the UUID standard

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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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HASHING

File hash / checksum never used

computes the checksum of any file you upload

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Text hash / checksum never used

turns any string into a non-reversible random-looking hash, perfect for fingerprinting or password storage

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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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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.