AppDevTools
App DevTools groups browser-based tools for text, web code, encoding, validation, and data conversion tasks.
About AppDevTools
AppDevTools is a browser-based collection of tools for software development tasks. It brings together utilities for text, HTML, CSS, JavaScript, JSON, Markdown, XML, YAML, CSV, PHP, SQL, and URL handling in one place. The site runs on the web and is presented as free online DevTools.
You can use it to format and minify code, validate HTML, CSS, JSON, XML, and YAML, and check for syntax errors with error reports. It also includes text tools such as a word counter, case converter, line sorter, and whitespace remover, plus encoders, decoders, and escape tools for URLs, HTML, XML, JavaScript, JSON, SQL, Base32, and Base58. Data conversion tools cover Markdown to HTML, XML to JSON, JSON to XML, YAML to JSON, CSV to JSON, and PHP arrays to JSON, among others. Random generators for passwords, passphrases, PINs, and UUIDs are also listed.
It suits developers, students, and others who work with code and data formats and need browser-based utilities for editing, checking, and converting content.
Key features
- Format and minify HTML, CSS, JavaScript, JSON, XML and SQL
- Validate HTML, CSS, JSON, XML and YAML with error reports
- Convert between JSON, XML, YAML, CSV and PHP arrays
- Encode, decode and escape URLs, HTML, XML and Base32/58
- Text tools for counting, case conversion, sorting and whitespace removal
- Generate passwords, passphrases, PINs and UUIDs
Best for: Developers and students who need browser-based tools for formatting, validating, and converting code and data.
Good for
- Covers many languages and formats in one place
- Runs in the browser with no install described
- Validators provide error reports for debugging
- Offers both formatting and minifying options
AppDevTools at a glance
- Website
- appdevtools.com
- Category
- Development › Developer Tools
- Type
- Online tool
- Pricing
- Free
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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AppDevTools FAQ
What is AppDevTools?
It is a web collection of free online tools for text, code, encoding, validation, and data conversion tasks.
Do I need to install anything to use AppDevTools?
No installation is described. The tools are listed as browser-based and work in the browser.
What conversion tools does AppDevTools offer?
It lists converters such as Markdown to HTML, XML to JSON, JSON to XML, YAML to JSON, CSV to JSON, and PHP array to JSON.
Does AppDevTools include validators?
Yes, it lists validators for HTML, CSS, JSON, XML, and YAML with error reports for debugging.
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