Dev Toolbox

Toolbox

A growing collection of developer utilities. Everything runs locally in your browser — no data leaves your machine.

Available tools

15 tools

Encoding

Base64

Encode and decode Base64 for text, files, images, PDFs and binary data.

base64encodedecode

JSON

Prettify, validate, minify, convert and inspect JSON payloads.

jsonprettifyvalidate

Encoding

URL

Encode, decode and inspect URLs and query strings.

urlencodedecode

Crypto

JWT

Decode JWT tokens and inspect header, payload, signature and expiration.

jwttokendecode

Crypto

Hash

Compute MD5, SHA-1, SHA-256, SHA-512 hashes and HMAC digests.

hashmd5sha256

Time

Timestamp

Convert Unix timestamps to human-readable dates and back.

timestampunixepoch

Crypto

UUID

Generate UUID v4, NanoID and ULID identifiers in batches.

uuidnanoidulid

Text

Regex

Test regular expressions with match highlighting and replace preview.

regexregexppattern

Text

Text Diff

Compare two texts with inline highlighting and unified diff output.

diffcomparetext

Text

Markdown

Preview Markdown as sanitized HTML with live rendering.

markdownmdpreview

JSON

CSV

Convert CSV to JSON and JSON to CSV with custom delimiters.

csvjsonconvert

Time

Cron

Parse cron expressions and preview upcoming execution times.

cronscheduleexpression

Design

Color

Convert colors between HEX, RGB, HSL, OKLCH and OKLab formats.

colorhexrgb

Design

Image

Convert images to WebP, AVIF, JPEG or PNG entirely in the browser.

imagewebpavif

Web

QR Code

Generate QR codes for text, URLs, WiFi, vCard, geo and calendar events.

qrqrcodebarcode