Developer tools

JSON Formatter

Format, minify and validate JSON without changing large integers, number notation, key order or string escapes. Import files and locate syntax errors.

Timestamp Converter

Convert Unix seconds or milliseconds into local, ISO, and UTC time.

HTML Editor

Edit HTML, CSS, and JavaScript with a network-enabled sandbox preview.

Text to Base64 converter

Convert UTF-8 text to Base64 and back instantly, with standard and URL-safe formats and full support for Unicode and emoji.

URL encoder and decoder

Encode URL parameters or full URIs and decode percent escapes, with explicit handling of spaces, plus signs and Unicode.

HTML entity converter

Escape HTML special characters or decode named and numeric entities. Optionally encode non-ASCII characters as numeric entities.

Unicode escape converter

Convert readable text to Unicode escapes and back, including UTF-16 pairs, code point escapes, emoji and common control characters.

JWT decoder

Inspect a JWT header and payload separately, and read issued-at, not-before and expiry claims as UTC dates.

Text hash calculator

Calculate SHA-256, SHA-384, SHA-512, SHA-1 and MD5 hashes of UTF-8 text, with a copy button for each result.

File checksum checker

Calculate a file checksum locally and compare it with an expected value to check a download or a transferred file.

HMAC calculator

Calculate HMAC-SHA-256, SHA-384 or SHA-512 using a text or hexadecimal key, useful for checking API signature inputs.

UUID generator

Generate RFC 9562 UUID v4 or v7 values in batches, with uppercase output, individual copying and text download.

Random password generator

Generate secure random passwords with your choice of length and character groups, optionally excluding look-alike characters.

Regular expression tester

Test JavaScript regular expressions, inspect match positions and capture groups, and preview text replacements as you type.

CSV to JSON converter

Convert CSV or TSV to JSON and back, with quoted fields, embedded newlines, Unicode and a table preview.

XML formatter and validator

Validate and format XML locally with two- or four-space indentation, preserving mixed text and xml:space whitespace.

chmod permission calculator

Set read, write, execute and special permission bits using a matrix or octal value, with live Linux symbolic permissions.

JSON Pointer query

Find and extract a JSON value by its path, browse available paths and preserve large numbers exactly.

JSON structure comparison

Compare JSON values and types independently of object key order, with precise paths for added, removed and changed data.

JSON to TypeScript types

Infer TypeScript types from JSON samples, including nested objects, optional properties, arrays, unions and null.

Text to hex and binary

Convert UTF-8 text to hexadecimal or binary bytes and decode bytes back to readable text, including Unicode and emoji.

Base32 encoder and decoder

Convert UTF-8 text to standard Base32 or Base32hex and back, with optional padding and strict decoding.

Gzip text compressor

Compress text to gzip, display compressed data as Base64, restore UTF-8 text and download a real .gz file locally.

Cron expression checker

Inspect a five-field Unix cron expression and see its upcoming execution times in UTC and your local time.