QweDevBox

35 free developer tools in one place: JSON formatter, Base64, JWT decoder, regex tester, diff, cron, UUID and more. Runs in your browser; nothing is uploaded.

Format

JSON Format / Validate – Pretty-print, minify and validate JSON
Line Sort / Dedupe – Sort, dedupe, reverse and trim lines

Encode / Decode

Base64 Encode / Decode – Convert text to and from Base64 (UTF-8)
URL Encode / Decode – Percent-encode or decode URL components
HTML Entity Encode / Decode – Escape and unescape HTML entities
Base64 Image Encode / Decode – Turn images into data URIs and preview Base64 images
Backslash Escape / Unescape – Escape quotes, newlines and control characters
Hex ↔ ASCII – Convert text to hexadecimal bytes and back
JWT Debugger – Decode JSON Web Token header and payload

Generate

UUID / ULID Generate / Decode – Generate UUID v4 / v7 and ULID, and decode existing IDs
Hash Generator – MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests
Random String Generator – Cryptographically secure random strings
Lorem Ipsum Generator – Placeholder text in paragraphs, sentences or words
QR Code Generate / Read – Create QR codes and read them from images

Convert

World Time Converter – Convert a time between time zones; starts from this computer's current time
Unix Time Converter – Convert Unix timestamps and date strings
Number Base Converter – Convert between binary, octal, decimal and hex
YAML ↔ JSON – Convert YAML to JSON and back
CSV ↔ JSON – Convert CSV to JSON and back
HTML to JSX – Convert HTML markup into React JSX
Query String ↔ JSON – Convert URL query strings to JSON and back
URL Parser – Split a URL into its parts and query parameters
Color Converter – Convert between HEX, RGB, HSL, HWB and CMYK
SVG to CSS – Turn SVG markup into a CSS background data URI
JSON ↔ PHP Array – Convert JSON to PHP array syntax and back
PHP Serialize / Unserialize – Convert JSON to PHP serialize() format and back

Text

RegExp Tester – Test regular expressions and inspect matches
String Case Converter – camelCase, snake_case, kebab-case and more
String Inspector – Count characters, bytes, words and inspect code points
Text Diff Checker – Compare two texts by line, word or character

Inspect

Cron Job Parser – Explain cron expressions and list upcoming run times
cURL Analyzer – Break down a cURL command and convert it to fetch()
X.509 Certificate Decoder – Inspect PEM certificates and chains

Preview

Markdown Preview – Render GitHub-flavored Markdown
HTML Preview – Render HTML in a sandboxed frame