Developer Tools
Essential tools for developers, programmers, and tech professionals
Streamline your development workflow with a comprehensive suite of developer tools. From JSON formatting to JWT decoding, Base64 encoding to hash generation: every utility a developer needs, running entirely in your browser.
All Developer Tools
JSON Formatter & Validator
Format, validate, and beautify JSON data instantly in your browser
Base64 Encoder & Decoder
Encode and decode Base64 strings instantly in your browser
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes instantly
UUID & ULID Generator
Generate UUID v4, UUID v7, and ULID identifiers instantly
JWT Decoder & Encoder
Decode, verify, and encode JSON Web Tokens (JWT) instantly in your browser
URL Encoder & Decoder
Encode and decode URLs, query strings, and URI components instantly in your browser
HTML Encoder & Decoder
Encode and decode HTML entities instantly in your browser
Password Generator
Generate secure random passwords with custom length and character sets
Password Strength Checker
Check password strength with detailed analysis, entropy calculation, and security recommendations
JSON to CSV
Convert JSON arrays and objects into CSV with flattening, custom delimiters, and quote control
CSV to JSON
Convert CSV data into JSON arrays with header detection, type inference, and configurable delimiters
XML Formatter & Validator
Pretty-print, minify, and validate XML with configurable indentation, attribute formatting, and well-formedness checks
XML ↔ JSON Converter
Convert between XML and JSON in both directions with attribute preservation and configurable formatting
YAML Formatter & Validator
Pretty-print, lint, and validate YAML with configurable indentation and detailed parser errors
YAML ↔ JSON Converter
Convert between YAML and JSON in both directions with auto-detection and configurable indentation
Markdown ↔ HTML Converter
Convert Markdown to HTML and HTML to Markdown bidirectionally with GitHub-Flavored Markdown support
What is in Developer Tools
The everyday utilities that sit between writing code and shipping it: formatting and validating JSON, YAML and XML, decoding a JWT to see what a token actually claims, generating UUIDs and secure passwords, hashing a string, and encoding or decoding Base64, URLs and HTML entities.
These are the tasks people habitually paste into the first search result, which is exactly the wrong habit when the payload is a production token or a customer record. Every tool here runs in your browser, so the data never reaches a server that could log it.
Each one does a single job and loads fast enough to use mid-debug rather than switching context. There is no account, no rate limit and no upsell on the second use.
Between them they cover most of what a working day throws up: a config file that will not parse, a token whose expiry is in question, a hash that has to match, an ID that has to be unique. Each is a single page you can keep open in a tab.
Common questions
Is it safe to paste a JWT or an API response here?
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Yes. The developer tools run entirely in your browser, so nothing you paste is transmitted or stored. That is the main reason to use them instead of a server side formatter, where a pasted token has left your control the moment you hit the button.
Is there a size limit on what I can paste?
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Practical limits come from your browser rather than from us. Documents of a few megabytes format without trouble; very large files may be slow to render because the work happens on your own machine.
Do these tools work offline?
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Once the page has loaded, the processing itself works without a connection because it runs locally. You need to be online only to load the page in the first place.