ASCII Table

Complete ASCII table, including decimal, hexadecimal, and binary representations of all 128 characters

ASCII Table - Developer's Toolbox

ASCII Table, American Standard Code for Information Interchange

Base64 Encoding and Decoding

Free online Base64 encoding and decoding tool with real-time conversion and encoding process visualization. Quickly and efficiently perform Base64 encoding and decoding, suitable for developers and IT professionals.

Base64 Encoding and Decoding Tool | Online Base64 Converter - Developer's Toolbox

Base Converter

Online base converter supporting conversion between binary, octal, decimal, and hexadecimal. Fast, accurate, and convenient number base conversion tool, suitable for programmers and students.

Base Converter - Binary, Octal, Decimal, Hexadecimal Conversion | Developer's Toolbox

CSS Color Names

Explore all named color values in CSS standards, including RGB and HSL value displays, and real-time color previews. An essential color reference tool for front-end developers.

CSS Color Names | Developer's Toolbox

Unicode Codepoint

Free online Unicode To Code Point conversion tool. Easily convert Unicode characters to corresponding code points, supporting bidirectional conversion. Suitable for developers, designers, and text workers.

Unicode To Code Point - Online Unicode Conversion Tool | Developer's Toolbox

Color Grayscale Calculator

Free online color grayscale calculator, quickly get the grayscale value of a specified color. Supports multiple color formats, including HEX, RGB, HSL, etc. Suitable for designers, developers, and color enthusiasts.

Color Grayscale Calculator - Online Color Grayscale Value Calculator | Developer's Toolbox

Color Luminance Online Calculator

Free online color luminance calculator, real-time calculation and display of color luminance values. Suitable for designers and developers for color contrast and readability analysis.

Color Luminance Calculator | Real-time Color Luminance Value Calculation | Developer's Toolbox

Color Convert

Online color conversion tool supporting conversions between RGB, HSL, CMYK, and hexadecimal color codes. Easily obtain different color formats, suitable for designers and developers.

Color Convert: RGB, HSL, CMYK Conversion Tool | Developer's Toolbox

Color Palette Generator

Online color palette generator supporting Tint/Shade, Analogous, Triadic, and Complementary color schemes. A color tool for designers and developers.

Color Palette Generator | Developer's Toolbox

Contrast Ratio, the difference in contrast between text color and background color, is extremely helpful for users with color vision deficiency.

Color Contrast Ratio Demo Page

Contrast Ratio Calculator

Free online color contrast ratio calculator. Input background and text colors for real-time contrast calculation and WCAG accessibility standard checks. Ideal for web designers and developers.

Contrast Ratio Calculator | Color Contrast Checker | Developer's Toolbox

The <wcag>Web Content Accessibility Guidelines (WCAG)</wcag> specify that for AA level, the contrast ratio should be greater than 4.5:1, and for large text, it should be greater than 3:1. For AAA level, the contrast ratio should be greater than 7:1, and for large text, it should be greater than 4.5:1.

Image DataURL Generator and Previewer

Free online tool to generate and preview image DataURLs. Convert images to base64 encoded DataURLs for web development use.

Image DataURL Generator and Previewer | Developer's Toolbox

Apifox

Base64 encoding and decoding with internal principle demonstration

Base64 Encoding Explained

Convert multiple webpages to Markdown format in bulk, with options for individual or ZIP download

Batch URL To Markdown

Convert between binary, octal, and hexadecimal

Binary Converter

Color Luminance Calculator

Color Palette

Color Contrast Ratio Calculator

Online CSV to JSON converter, quickly convert CSV data to JSON format, with copy and download support

CSV to JSON

Online CSV to Markdown table converter, quickly convert CSV data to Markdown table format, with copy and download support

CSV to Markdown Table

JPEG Metadata Viewer

Front-end Tech Stack Icons

Detect file type based on binary magic numbers

File Type Detector

Online generation of MD5, SHA1, SHA256, SHA512

Hash Generator

Free online HTML entity encoding and decoding service

HTML Entity Encoding

Real-time HTML to Markdown conversion, supporting complex syntax like tables and code blocks

HTML To Markdown

Internal representation of IEEE 754 double-precision floating-point numbers

IEEE 754 Illustration

Use Github repository as your personal image hosting

MicroGallery - Personal Image Hosting

Image Grayscale Generator

Image placeholder generator and API, customizable height, width, color, etc.

Image Placeholder API

Image Share Link Generator

IP Info

Online JSON to CSV converter, quickly convert JSON data to CSV format, with copy and download support

JSON to CSV

Online JSON to Markdown table converter, quickly convert JSON data to Markdown table format, with copy and download support

JSON to Markdown Table

Decode and validate JSON Web Tokens with detailed information

JWT Decoder & Validator

Create and sign JSON Web Tokens with custom payloads and signing algorithms

JWT Encoder

Markdown CV

Online Markdown editor with WeChat theme support

Markdown Code Editor

Convert between Markdown tables, CSV, and JSON formats

Markdown Table Generator

Online Markdown table to CSV converter, quickly convert Markdown table data to CSV format, with copy and download support

Markdown Table to CSV

Online Markdown table to JSON converter, quickly convert Markdown table data to JSON format, with copy and download support

Markdown Table to JSON

Debug and test npm libraries online in the browser console

NPM Online Execution

QR Code Generator

Real-time editing and running of React single component code

React Live Execution

Semver Range Query

Comprehensive symmetric encryption algorithms

Symmetric Encryption

Fast image compressor with no size or quantity limits

TinyImage - Fast Image Compressor

Online tree structure generator from Markdown lists

Tree Structure Generator

UserAgent Parser

Unicode To Code Point

Unicode to UTF-16 conversion with internal principle demonstration

Unicode To UTF-16

Unicode to UTF-32 conversion with internal principle demonstration

Unicode To UTF-32

Unicode to UTF-8 conversion with internal principle demonstration

Unicode To UTF-8

Free online URL encoding and decoding service

URL Encoding

UUID Generator

IEEE 754

Explore the internal representation of IEEE 754 double-precision floating-point numbers, understand why 0.1 + 0.2 !== 0.3, and learn about the maximum safe integer problem. An online visualization tool to help developers deeply understand the binary representation of floating-point numbers.

IEEE 754 Double Precision Floating-Point Internal Representation | Developer's Toolbox

Name

JPEG EXIF Previewer

Free online JPEG EXIF previewer, ad-free, quickly parse Metadata within 1 second, support viewing image metadata, camera information and GPS location, etc., with no usage limit.

Free Online JPEG EXIF Previewer | Developer's Toolbox

Symmetric Encryption Algorithms

Free online symmetric encryption tool supporting DES, 3DES, AES, RC4, Rabbit algorithms. Quickly and securely encrypt and decrypt your data without downloading software.

Online Symmetric Encryption Tool - DES, 3DES, AES, RC4, Rabbit | Developer's Toolbox

Free online HTML entity encoding and decoding tool, supporting HTML escape character conversion. Real-time conversion, prevents XSS attacks, ad-free.

HTML Entity Encoding/Decoding Tool - Developer's Toolbox

Free online file type detector. Analyze file formats through binary data, supporting various file types. Quickly and accurately identify file types.

File Type Detector | Online File Format Analyzer | Developer's Toolbox

MicroGallery

MicroGallery is a simple and easy-to-use personal image hosting tool. It supports configuring Alibaba Cloud OSS, Tencent Cloud COS, etc. as image hosting, and you can get your exclusive image hosting service in just a few steps.

MicroGallery - Personal Image Hosting | Developer's Toolbox

Transform HTML code or webpage URLs into clean Markdown format

Convert HTML to Markdown

Edit HTML

HTML/URL To Markdown

HTML Input

Convert HTML to Markdown online, transform URLs into Markdown. Free, real-time conversion with support for code, tables, and complex formats. Perfect for extracting content for LLM and AI tools.

Convert HTML to Markdown online, transform URLs into Markdown. Free, real-time conversion with support for code, tables, and complex formats.

HTML To Markdown Converter | URL To Markdown Tool

HTML To Markdown Converter | URL To Markdown Tool | Developer Toolbox

Markdown Preview

Get Content from URL

Free online image grayscale generator. Easily convert color images to black and white. Supports various image formats, no software download required, quick and simple.

Image Grayscale Generator | Free Online Color to Black and White Image Converter | Developer's Toolbox

Beautiful Share Image Generator

Enter image title

Quickly create beautiful share images with the Image Share Generator. Customize title, author, background color, rounded corners, and easily export to PNG or JPG format with one-click clipboard copying.

Image Share Generator

Developer's Arsenal, the most professional and useful toolbox for developers

Discover, use, and collect efficient tools designed for developers to enhance your development efficiency.

Developer's Arsenal

Developer's Arsenal · Toolbox for Programmers

Create and sign JSON Web Tokens (JWT) with this online tool. Generate secure tokens with custom payloads.

Decode and validate JSON Web Tokens (JWT) with this online tool. View header, payload, and signature information.

Subject

Convert CSV files to JSON format online. Supports object array and 2D array formats for quick data format conversion.

CSV to JSON Online Converter

Convert CSV files to Markdown table format online. Copy and download support for quick table data conversion.

CSV to Markdown Table Online Converter

Table Format Converter

Input

Convert JSON data to CSV format online. Supports object array and 2D array formats for easy data export.

JSON to CSV Online Converter

Convert JSON data to Markdown table format online. Supports object array and 2D array formats for easy data conversion.

JSON to Markdown Table Online Converter

Convert Markdown tables to CSV format online. Copy and download support for data processing and analysis.

Markdown Table to CSV Online Converter

Convert Markdown tables to JSON format online. Supports object array and 2D array formats for data exchange.

Markdown Table to JSON Online Converter

Free online table format converter supporting conversion between Markdown tables, CSV, and JSON formats. Easy table data processing.

Output

Online Table Format Converter - Markdown/CSV/JSON

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404 - Page Not Found

Sorry, the page you requested does not exist. Please return to the homepage or try other tools.

404 - Page Not Found | Developer's Toolbox

Image Placeholder Generator

Free online image placeholder generator and API, supporting customizable width, height, text, background color, text color, etc., suitable for web design and development.

Image Placeholder Generator and API | Developer's Toolbox

Free online QR code generator supporting text, URLs, contact information, and more. Quickly create high-quality, customizable QR codes for various scenarios.

QR Code Generator - Create Custom QR Codes Online | Developer's Toolbox

Random UserAgent

Free online random UserAgent generator. Provides random User-Agents for developers and web scraping engineers to improve efficiency and anonymity.

Random UserAgent Generator | Developer Toolbox

React Code Live Runner

Learn React quickly by editing and testing your React code online. Test simple React components and functions with real-time preview to improve development efficiency.

React Code Live Editor and Runner | Developer's Toolbox

Semver Version Range Viewer

Online Semantic Versioning (SemVer) version range query tool. Easily parse and understand npm package version numbers, supporting common version formats such as ^, ~, x, *.

Semver Version Range Query Tool - Semantic Versioning Parser | Developer's Toolbox

Semantic Version, consisting of three parts, <emphasis>MAJOR.MINOR.PATCH</emphasis>.

Click to upload or drag and drop images you want to compress

TinyImage - Fast Image Compression Tool

TinyImage is a free online image compression tool that supports batch compression, unlimited image size and quantity, and can convert to WebP and AVIF formats, helping you quickly optimize website images and improve loading speed.

TinyImage - Fast Online Image Compression Tool | Developer's Toolbox

Tree Structure Visualization Generator

Quickly generate tree structures using Markdown syntax. Supports real-time preview and one-click copy, ideal for project structure display and document outline generation.

Tree Structure Generator | Generate Tree Structures from Markdown Lists Online

Input UserAgent

Free online UserAgent parser tool. Easily parse and analyze browser, operating system, device, and engine information from UserAgent strings.

UserAgent Parser | Online UA Parser Tool | Developer's Toolbox

URL Encoding / Percent Encoding

Free online URL encoding and decoding tool. Supports URL Encoding and Percent Encoding, easily convert special characters and non-ASCII characters. Suitable for developers and web professionals.

URL Encoding/Decoding Tool - Online URL Encoding and Percent Encoding | Developer's Toolbox

Unicode to UTF-16

Convert Unicode text to UTF-16 encoding format online. UTF-16 is a variable-width character encoding that can encode all Unicode characters using 2 or 4 bytes.

Version 4 UUID