PTBox · Developer Toolbox

Fast, local, SEO-friendly utilities for everyday development work — JSON, encoding, crypto, regex, QR codes and more.

Format / Parse

Format, validate and parse structured data

JSON Formatter

Format, minify and validate JSON with error location.

JSON Diff

Compare two JSON trees by path, with added / removed / changed annotations.

Regex Tester

Test regular expressions live with match and group highlighting.

Encode / Decode

Common encoders, decoders and character conversion

Base64

Convert between Base64 and UTF-8 text, with URL-safe option.

Shouyin Translator

Encode/decode text using the Chinese 'shouyin' cipher (嗷呜啊~).

URL Encoder

encodeURIComponent / decodeURIComponent in the browser.

Crypto / Hash

Hashing, JWT, AES, RSA and related cryptographic tools

Hash Calculator

Compute MD5, SHA-1, SHA-256, SHA-384, SHA-512 in real time.

RSA Crypto

Generate RSA key pairs locally; public-key encrypt / private-key decrypt.

AES File Encrypt

AES-encrypt any file locally; self-contained format restores the original filename.

AES Crypto

AES-GCM / AES-CBC encrypt and decrypt with password or hex key.

JWT Decoder

Parse JWT header / payload and show expiry.

Generators

IDs, random values, placeholder data, etc.

Password Generator

Customizable strong random passwords with entropy estimation.

UUID Generator

Bulk-generate RFC 4122 compliant UUID v4 values.

Date / Time

Timestamps, time zones, date format conversion

Cron Parser

Parse cron expressions; preview the next 10 executions.

Timestamp Converter

Convert between Unix timestamp and date/time in any timezone.

Image / Scan

QR code generator/decoder and other image utilities

QR Code Generator

Generate QR codes from text / URL; customize colors and error correction.

QR Code Decoder

Decode QR codes from images; keeps a local history.

Design / Color

Color picker, format conversion, contrast checker

Color Picker

Pick a color and convert between HEX / RGB / HSL / HSV; WCAG contrast included.

Network / HTTP

HTTP request debugging, API testing

HTTP Request

Browser-local HTTP request tester, like a lightweight Postman.

Text Tools

Character counting, case conversion, text utilities

Markdown Preview

Edit on the left, rendered on the right. Supports GitHub Flavored Markdown.

Chinese Variant Converter

Convert between Simplified / Traditional Chinese (Standard / Taiwan / Hong Kong).

Case Converter

Convert text to UPPER / lower / camelCase / snake_case / fullwidth and more.

Text Counter

Real-time character, word, line and byte stats, friendly to mixed CJK/Latin text.

Math / Formula

LaTeX formula editor, math symbols and more

Unit Converter

Local conversions across 10 common categories: length, mass, volume, area, temperature, time, speed, data storage, angle, pressure.

LaTeX Formula

Live LaTeX preview, common-formula cheat sheet, one-click copy as Markdown / source.

Finance / Currency

Currency converter, interest calculator and finance utilities

Currency Converter

Convert between 30+ major currencies. Works offline via local cache.

Exchange Rate History

Visualize 7 / 30 / 90 / 365-day trends for any pair of major currencies.