Toolbox - Practical Online Developer Toolbox

Base64 Encoder/Decoder

Encode and decode text using Base64

Text Diff Viewer

An online tool to compare two texts and highlight the differences (diff). Supports split view and unified view.

Fullscreen Text

A simple large screen text display tool supporting custom background color, text color, and font size. Suitable for use as a teleprompter, temporary billboard, or large screen display.

JSON Formatter

Format, compress and validate JSON data

JSON to Table

Free online JSON to Table converter tool. Convert JSON arrays to HTML tables and export to CSV/Excel files. Runs locally to protect your data privacy.

LaTeX Editor

Free online LaTeX formula editor with real-time preview, symbol palette, formula templates, and PNG export.

Markdown Preview

Real-time Markdown text rendering preview

Random Username Generator

Free online random username generator supporting Chinese and English with multiple styles.

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Unicode Converter

Free online Unicode converter tool. Convert text to Unicode and Unicode to text. Supports \\uXXXX, &#xXXXX;, and &#XXXX; formats. Runs locally in your browser for privacy.

URL Encoder/Decoder

Online URL encode and decode tool.

Word Cloud Generator

Free online word cloud generator for multilingual text (Chinese/English/Japanese). Analyze word frequency and export as PNG. Runs locally for privacy.

Word Counter

Online word counting tool to calculate characters, words, and lines.

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XML Formatter

Online XML formatter, minifier, and XML to JSON converter with tag sorting and syntax highlighting.

YAML ↔ JSON Converter

Convert between YAML and JSON formats online

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Image Tools

Image EXIF Viewer

Free online EXIF viewer. Drag or select images to parse camera model, shutter speed, aperture, ISO, focal length, shooting time, and GPS. All parsing runs locally in your browser.

Favicon Generator

Generate multi-size favicons from an image, supporting 16x16 to 512x512

Image Base64 Converter

Online Image to Base64 and Base64 to Image converter tool

Image Compressor & Converter

Compress images to JPEG/PNG/WebP with quality and size settings

Image Crop

Crop images online with free crop or fixed aspect ratios

Image Merge

Merge multiple images horizontally or vertically into one, with customizable gap and background color

🕵️ Image Steganography

Hide text messages inside image pixels. Supports batch processing, runs locally in browser for privacy.

Image to SVG Converter

Free online image to SVG converter, converts JPG/PNG bitmaps to SVG vector graphics. Supports color count and blur adjustment, processes locally in browser.

Image Watermark

Add text watermark to your images easily. Customize position, color, size, and opacity.

🖼️ OG Image Generator

Generate beautiful Open Graph (OG) images online for blog posts and social media share cards.

Image Background Remover

Free online tool to remove white background from images and convert to transparent PNG. Supports threshold adjustment, processes locally in browser for privacy.

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Developer Tools

Color Converter

Convert between HEX, RGB, and HSL color formats

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Docker Generator

Free online Docker command generator. Quickly generate docker run, exec, logs, build, compose commands. Supports port mapping, volume mounting, environment variables.

File Hash Calculator

Calculate MD5, SHA-1, SHA-256, SHA-512 hash of files online, supports large files

🛡️ Headers Analyzer

Fetch website HTTP response headers, analyze security configurations (HSTS, CSP), and detect information leakage risks.

Mock API (JSON)

Edit JSON online and generate a permanent API link for frontend development and debugging.

JWT Decoder

Online JWT (JSON Web Token) decoder tool

Kubectl Generator

Quickly generate common Kubernetes (kubectl) management commands.

Lorem Ipsum Generator

Generate Lorem Ipsum placeholder text online.

📱 Social Preview

Extract Meta tags, Open Graph info, and Twitter Cards from webpages, and preview how they look on Google, Facebook, and Twitter.

Password Generator

Free online random password generator with customizable length and character types.

Regex Tester

Online regex testing and debugging tool

Text Encrypt & Share

Encrypt text with AES-256 and generate temporary share links for secure transmission

UUID Generator

Generate standard UUID/GUID unique identifiers

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Network Tools

Browser Fingerprint

View your browser fingerprint information online

DNS Lookup

Check DNS records (A, MX, NS, etc.) and Whois information for any domain

IP Lookup

Look up your IP address and geolocation information online

Iptables Generator

Quickly generate common iptables commands for firewall management.

🔒 Website Status

Check website accessibility, HTTP status codes, response time, and SSL certificate status.

Webhook Tester

Generate a unique URL to test and inspect webhooks and HTTP requests.

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Date & Time

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Cron Expression Tool

Free online Cron expression parser with visual builder, expression validation, and execution time preview. Easily create scheduled tasks.

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Timestamp Converter

Convert between timestamp and datetime

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Timezone Converter

Free online timezone converter. Parse time strings with timezone offset and convert to multiple timezones instantly. Supports ISO 8601 and various formats.

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Business Tools

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Encrypted QR Code

Free online encrypted QR code generator. Use AES-256 encryption to protect text content and generate QR codes that require a password to view. Runs entirely in your browser for privacy.