Free Online Tools For Developers

I created this website to help developers by providing them with free online tools. These tools include several formatters, validators, code minifiers, string escapers, encoders and decoders, message digesters, web resources and more.

I will add new tools on a regular basis, so be sure to add this site to your bookmarks.

If you encounter a bug, I would very much appreciate that you send me an email (freeformatter@gmail.com) that explains the nature of your bug. Please include details like which browser version you're using and the steps to reproduce the bug. Other comments are welcome.

-MrForms

-List of tools-

JSON Formatter / Beautifier


Formats a JSON string/file with your desired indentation level creating an object tree with color highlights. You can now clearly identify object constructs (objects, arrays and members). The JSON tree that is created can be navigated by collapsing the individual nodes one at a time if desired.

  • Formats your JSON string/file with choice 6 indentation levels: 2 spaces, 3 spaces, 4 spaces, compact mode, JavaScript escaped and tab separated
  • Creates a tree representation of the JSON objects for easy navigation
  • Color highlights the different construct of your JSON objects
  • Supports copy-paste or file upload

HTML Formatter / Beautifier


Formats a HTML string/file with your desired indentation level. The formatting rules are not configurable but I think it provides the user with the best possible output.

  • Formats the HTML with 4 indentation levels: 2 spaces, 3 spaces, 4 spaces and tab separated
  • Color highlights the different construct of your HTML document
  • Supports copy-paste or file upload

XML Formatter / Beautifier


Formats a XML string/file with your desired indentation level. The formatting rules are not configurable but it uses a per-element indentation pattern giving the best readability.

  • Formats the XML with 4 indentation levels: 2 spaces, 3 paces, 4 spaces and tab separated
  • Color highlights the different construct of your XML document
  • Supports copy-paste or file upload

SQL Formatter / Beautifier


Formats any SQL query with your desired indentation level, even if your SQL statement is invalid. You can modify the case of the SQL keywords and identifiers to upper case, lower case or keep them as-is.

This SQL beautifier is especially useful for SELECT statements, but can also handle INSERT, UPDATE and DELETE statements. It was built to be agnostic of the database that is targeted and should support MySQL, Microsoft SQL Server, Oracle and other SQL ANSI databases.

  • Formats the SQL with 4 indentation levels: 2 spaces, 3 paces, 4 spaces and tab separated
  • Formats the SQL regardless of the validity of the statement
  • Change the case of keywords or identifiers to upper case, lower case or keep them as-is
  • Database agnostic
  • Supports SELECT, INSERT, UPDATE and DELETE statements
  • Supports copy-paste or file upload

JSON Validator


Validates a JSON string against RFC 4627 (The application/json media type for JavaScript Object Notation) and against the JavaScript language specification. You can configure the validator to be lenient or strict.

  • Validates your JSON string/file against RFC 4627 in either strict or lenient mode
  • Validates your JSON string/file against the JavaScript specification
  • Supports copy-paste or file upload

HTML Validator


Validates the HTML string/file for well-formedness and compliance with w3c standards. It tries to make use of the doctype declaration to evaluate the document structrue but will resort to best practice if unmatched. The validator will report on missing or invalid attributes, unknown tags, unclosed tags and more.

  • Validates your HTML string/file using the doctype if possible or the 'best practices' if not
  • Checks for invalid tags, missing or invalid attributes, unclosed markeup and much more
  • Supports copy-paste or file upload

XML Validator (XSD)


Validates the XML string/file against the specified XSD string/file. XSD files are "XML Schemas" that describe the structure of a XML document. The validator checks for well-formedness first, meaning that your XML file must be parsable using a DOM/SAX parser. Only then does it validate your XML against the XML Schema. The validator will report fatal errors, non-fatal errors and warnings.

  • Validates your XML string/file using the provided XSD string/file
  • Supports copy-paste or file upload

XPath Tester


Executes an XPath query against an XML file. This online XPath tester will output the actual matched XML content along with the XML item type (Element, Text, CData, Attribute, etc.). Each match is displayed on a single line and this allows you also extract a subset of data if desired. XPath 2.0/3.0 compatible.

  • XPath 2.0/3.0 compatible
  • Supports XML namespaces
  • Extensive support of XPath functions
  • Reports the item type of the matched XML parts
  • Supports copy-paste or file upload

Credit Card Number Generator & Validator


Validates credit card numbers and also generates fake credit card numbers for all major brands. Obviously these number are for testing purposes and will not work with a payment processor. Also contains a full documentation and example of the Luhn algorithm used to validate most credit cards (Mod 10).

  • Validates credit card numbers
  • List of all card number formats per card issuer
  • Random credit card number generator for all major brands
  • Luhn algorithm explained

Regular Expression Tester


This regular expression tester will highlight every match in the original string so that you know exactly where a match occurs. It can be configured to be case-insensitive, work in multi-line mode and perform global matches. It also supports string replacements through with groups. It runs against a Java engine.

  • Highlights all matches in the original string
  • Supports the DOTALL flag; i.e. the dot metacharacter matches everything including line breaks
  • Supports case-insensitive, multiline and global flags
  • Extensive list of examples and regular expression recipes
  • Supports string replacements

Java Regular Expression Tester


This free Java regular expression tester lets you test your regular expressions against any entry of your choice and clearly highlights all matches. It is based on the Pattern class of Java 8.0.

  • Based on Java Pattern Class (Java 8.0)
  • Highlights all matches in the original string and shows extensive group details
  • Supports Java Pattern Flags (dotall, multiline, unix lines, etc.)
  • Extensive list of examples and regular expression recipes
  • Supports string replacements

Cron Expression Generator - Quartz


Generate a quartz cron expression with an easy to use online interface. Convert a cron expression into a readable text that clearly explains when it will execute, and visualize the next execution dates of your cron expression.

  • Convert a cron expression to text
  • Generate cron expression using simple user interface
  • Show next run time of cron expression
  • Preview most commonly used cron expression examples

XSD Generator


Generates a XSD (XML Schema) from a XML file. Simply copy-paste OR upload your XML document and let the generator figure out the rest. The generator will try to use a 'smart' approach to figure out the data type (you can always refine it after).

  • Supports XML namespaces
  • Properly guesses the data types using provided data
  • Supports 3 designs: Russian Doll, Salami Slice and Venetian Blind

XSL Transformer (XSLT)


Transforms an XML file using an XSL file (XSL Transformation). You can also select your desired indentation level in the output.

  • Supports XML namespaces
  • Formats the resulting XML with 5 indentation levels: 2 spaces, 3 spaces, 4 spaces, compact and tab separated
  • Supports copy-paste or file upload

XML Validator (XSD)


Validates the XML string/file against the specified XSD string/file. XSD files are "XML Schemas" that describe the structure of a XML document. The validator checks for well-formedness first, meaning that your XML file must be parsable using a DOM/SAX parser. Only then does it validate your XML against the XML Schema. The validator will report fatal errors, non-fatal errors and warnings.

  • Validates your XML string/file using the provided XSD string/file
  • Supports copy-paste or file upload

XML to JSON Converter


Converts an XML file into a JSON file. You can also select your desired indentation level in the output.

  • Let's you specify a prefix for XML attributes when converted to JSON properties
  • Let's you specify the name of the JSON properties used to represent #text item types
  • Formats your JSON string/file with 6 indentation level: 2 spaces, 3 spaces, 4 spaces, compact mode, JavaScript escaped and tab separated
  • Creates a tree representation of the JSON objects for easy navigation (if file is under 1meg, else formats as plain text)
  • Color highlights the different construct of your JSON objects
  • Supports copy-paste or file upload

JSON to XML Converter


Converts a JSON file into an XML file. You can also select your desired indentation level in the output.

  • Let's you specify the name of the root element and the name of array elements
  • Formats your XML string/file with 5 indentation levels: 2 spaces, 3 spaces, 4 spaces, compact mode and tab separated
  • Supports copy-paste or file upload

CSV to XML Converter


Converts a CSV file into a XML file. You can also select your desired indentation level in the output. Define a XML snippet that will be applied to each line of the CSV and use placeholders to substitute the values.

  • Supports multiple quote and delimiter characters
  • Formats your XML string/file with 5 indentation levels: 2 spaces, 3 spaces, 4 spaces, compact mode and tab separated
  • Supports copy-paste or file upload

Epoch Timestamp To Date


Converts an epoch/unix timestamp into a human readable date. It also lets you do the inverse, i.e. converts a human readable date into an epoch/unix timestamp. It also displays the current epoch/unix timestamp in both seconds and milliseconds.

  • Displays the current epoch timestamp in seconds and milliseconds
  • Converts epoch timestamps from seconds/milliseconds to human readable date
  • Converts human readable dates into epoch timestamps

Url Encoder & Decoder


Encodes or decodes a string so that it conforms to the the Uniform Resource Locators Specification - URL (RFC 1738).

The specification says that only the following characters are allowed in a URL "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789$-_.+!*'()". Therefore, all other characters will be encoded to a two digit hexadecimal value that represents the character in the proper ISO character set.

Base 64 Encoder & Decoder


Encodes or decodes a string or a binary file so that it conforms to the Base64 Data Encodings specification (RFC 4648).

Convert File Encoding


Changes the encoding of a file to another one. For example, this tool will allow you to change the encoding of your file from ISO-8859-1 to UTF-8 or from UTF-8 to UTF-16.

What encoding is my file using? This tool will try to auto-detect the encoding used in the file and tell you.

Message Digester


Computes a digest from a string using different algorithms. Supports the following algorithms: MD2, MD4, MD5, SHA1, SHA-224, SHA-256, SHA-384, SHA-512, RIPEMD128, RIPEMD160, RIPEMD320, Tiger, Whirlpool, GOST3411.

HMAC Generator / Checker


Computes a Hash-based message authentication code (HMAC) using different algorithms. Supports the following algorithms: HMACMD2, HMACMD4, HMACMD5, HMACSHA1, HMACSHA224, HMACSHA256, HMACSHA384, HMACSHA512, HMACRIPEMD128, HMACRIPEMD160, DESMAC, DESMAC/CFB8, DESEDEMAC, DESEDEMAC64, DESEDEMAC/CFB8, DESEDEMAC64WITHISO7816-4PADDING, GOST28147MAC, IDEAMAC, IDEAMAC/CFB8, ISO9797ALG3MAC, ISO9797ALG3WITHISO7816-4PADDING, PBEWITHHMACSHA, PBEWITHHMACSHA1, PBEWITHHMACRIPEMD160, RC2MAC, RC2MAC/CFB8, RC5MAC, RC5MAC/CFB8, SKIPJACKMAC, SKIPJACKMAC/CFB8, HMACTIGER.

QR Code Generator


Generates QR codes using various standards such as Address Book / Contact Information (VCARD), Events (VEVENT), Emails (MAILTO), GEO Coordinates (GEO), SMS (SMSTO), Telephones (TEL), URLs and WiFi connections. You can also choose your error correction level from the standards L (Low 7%), M (Medium 15%), Q (Quartile 25%) and H (High 30%).

JavaScript Beautifier


Formats your JS files for optimal readability. This JavaScript beautifier tool lets you choose your indentation levels and how you want braces to be generated

  • Beautifies your JavaScript using either tabs, 2 spaces, 3 spaces or 4 spaces
  • Choose different brace styles: collapsed, expanded, or expanded with new line
  • Automatically adds spaces before functions and conditional statements for optimal readability

CSS Beautifier


Formats your CSS files for optimal readability. This CSS beautifier tool lets you choose your indentation levels.

  • Beautifies your CSS using either tabs, 2 spaces, 3 spaces or 4 spaces
  • Automatically adds empty lines between definitions

JavaScript Minifier


Compresses a JavaScript string/file with no possible side-effect.

  • No possible side-effect on code
  • Removes useless white spaces, indentation characters and line breaks
  • Replaces local variable names with smaller ones and takes care of substituting the references
  • Does not modify eval statement because of possible overboard effects

CSS Minifier


Compresses a CSS string/file with no possible side-effect.

  • Removes useless white spaces, indentation characters and line breaks
  • Strips all comments
  • Removes the last semi-colon of a style declaration
  • Removes extra semi-colons
  • Removes empty CSS declarations
  • Removes measure units when using zero values
  • Removes the leading 0 if a float value is lower than one
  • Chances RGB color values to a shorter hexadecimal format
  • Hexadecimal colors following the pattern #AABBCC are reduced to #ABC
  • Keeps a single charset per CSS file removing all extra declarations
  • None values are converted to 0 whenever safe to do so

String Utilities


Online string utilities written in JavaScript.

  • Convert a string to lowercase or uppercase
  • Character count
  • Word count
  • Reverse string
  • String splitter
  • Detailed character information (decimal, octal, hexadecimal, unicode, html entity, etc.)

HTML Escape


Escapes or unescapes an HTML file removing traces of offending characters that could be wrongfully interpreted as markup.

  • Escapes all reserverd characters with their corresponding HTML entities (', ", &, <, >)
  • Escapes ISO 8859-1 symbols and characters that have corresponding HTML entities

XML Escape


Escapes or unescapes an XML file removing traces of offending characters that could be wrongfully interpreted as markup.

Java and .Net Escape


Escapes or unescapes a Java or .Net string removing traces of offending characters that could prevent compiling.

JavaScript Escape


Escapes or unescapes a JavaScript string removing traces of offending characters that could prevent interpretation.

JSON Escape


Escapes or unescapes a JSON string removing traces of offending characters that could prevent parsing.

CSV Escape


Escapes or unescapes a CSV string removing traces of offending characters that could prevent parsing.

SQL Escape


Escapes or unescapes a SQL string removing traces of offending characters that could prevent parsing.

Lorem Ipsum Generator


The lorem ipsum generator lets you choose how many sentences, paragraphs or list items you want. You can also select to include HTML markup and specify how big the text should be.

List of MIME types


I have compiled a full list of MIME types using the "mime.types" file of the Apache HTTPD server. I took the liberty of adding a name/description for each MIME type so that it's clearer what they represent. I have also included a significant link for each type with more details for it.

HTML Entities


Complete list of HTML entities with their numbers and names. Also included is a full list of ASCII characters that can be represented in HTML (i.e. printable characters).

Url Parser / Query String Splitter


This tools parses a URL into its individual components (protocol, scheme, userinfo, host, port, authority, path, resource, etc.) and also splits the query string into a human readable format. It also decodes each query string parameter to make them easier to understand.

i18n - HTML, XML, JSON, SQL snippets


Includes a detailed list of formatting standards for dates, time, decimals, currencies and more with code snippets in Java, C#, JavaScript and PHP. It also provides code snippets for provinces, states, regions, districts and counties in HTML, CSV, XML, JSON and SQL.