Developer Tools

Format, validate, and inspect JSON with clear error positions.

Encode and decode Base64 and Base64URL locally in your browser.

Encode and decode URL components and query strings safely.

Generate and inspect UUID variants including NIL, v1, v3, v4, and v5 values locally.

Compute supported cryptographic hashes and encodings from text input locally.

Decode JWT headers and payloads locally — no signature verification.

Test regular expressions against sample text with live matches.

Parse Cron expressions into readable schedule fields and validate their structure.

Convert between octal and symbolic Unix file permissions.

Calculate network range, broadcast, and host counts from CIDR notation.

Compare two texts and highlight every added and removed line.

Convert YAML to JSON and JSON to YAML without losing structure.

Turn JSON arrays into CSV rows and CSV data back into JSON.

Pretty-print and validate XML documents with indentation.

Encode and decode HTML entities for safe markup display.

Convert integers between bases 2 and 64, including binary, decimal, hexadecimal, and custom bases.

Parse a User-Agent string into browser, OS, and device details.

Expand IP ranges into start, end, count, and CIDR blocks.

Parse a URL into scheme, host, port, path, query parameters, and fragment.

Parse a raw HTTP header block and explain every header line.