JSON Formatter and Beautifier
Indent valid JSON into a readable structure.
Developer Tools
Format data, inspect encodings and generate useful development values locally.
Choose the operation that matches your task. Each tool explains its limits, accepts local input and lets you copy or download the result. Your original files remain unchanged.
JSON Validator
Check JSON syntax locally and receive a clear validation result.
JSON Minifier
Remove formatting whitespace from valid JSON without changing its values.
Base64 Encoder
Encode UTF-8 text as Base64 in your browser.
Base64 Decoder
Decode Base64-encoded UTF-8 text with validation.
URL Encoder
Percent-encode a text value for use as one URL component.
URL Decoder
Decode percent escapes in a URL component without opening a URL.
HTML Encoder
Escape HTML-sensitive characters so text can be represented as data.
HTML Decoder
Decode numeric HTML references and common named entities into plain text.
JWT Decoder
Inspect a JWT header and payload locally without verifying its signature.
UUID Generator
Generate random UUID version 4 identifiers using browser cryptography.
Random String Generator
Generate random alphanumeric strings using browser cryptography.
Regex Tester
Test a JavaScript regular expression and inspect matching text and positions.
Timestamp Converter
Convert an ISO date with timezone into Unix seconds and milliseconds.
Unix Timestamp Converter
Convert Unix seconds or milliseconds into an ISO UTC date.
URL Parser
Inspect the components and query entries of an HTTP or HTTPS URL locally.
HTTP Status Code Reference
Look up standard HTTP response status names and categories without requesting a website.
HTML to Markdown
Convert pasted HTML structure into readable Markdown without executing the HTML.
Color Converter
Convert opaque HEX, RGB and HSL color values with explicit range validation.
Markdown to HTML
Convert Markdown into HTML source displayed safely as plain text.
Choosing a tool
Use one operation at a time and check the result before replacing important source data. CSV utilities parse structured records; text tools work on physical lines. Those are different when quoted CSV fields contain line breaks.
Where is processing performed?
Tool input and file contents are processed locally in your browser. Opening a page still sends ordinary page requests to the hosting provider.