Devtool.tech - Developer Toolbox Home

Developer's Arsenal

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

Tool Topics

Navigation

View Mode

Tool Topics

Markdown Tools

HTML to Markdown, directory trees, table conversion, and batch URL processing.

Encoding & Hashing

Base64, URL encoding, hash generation, and UTF-8 charset conversion.

JWT Debugging

Decode and encode tokens, and check timestamps.

Color Tools

Convert colors, check contrast, build palettes, and explore OKLCH.

Table Tools

Convert and generate CSV, JSON, Markdown, HTML, Excel, and more.

Image Tools

Compress, remove backgrounds, watermark, read EXIF, and convert formats.

Developer Tools

UUIDs, timestamps, passwords, hashes, ASCII codes, and IP lookup.

Code

Markdown Table Generator

Convert between Markdown tables, CSV, and JSON formats

Table

Code

HTML To Markdown

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

Code

Batch URL To Markdown

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

Code

Markdown Code Editor

Online Markdown editor with WeChat theme support

Code

React Live Execution

Real-time editing and running of React single component code

Code

HoneKit Prompt Library

Chrome sidebar prompt library + on-device AI enhancer for ChatGPT & Claude—private, local storage, no API keys

Code

Color Tools

Color Convert

Convert between RGB, HSL, and CMYK

Color Tools

Color Palette

Tint/Shade color series generator

Color Tools

CSS Color Names

Named color values in CSS standards

Color Tools

Color Contrast Ratio Calculator

Online Contrast Ratio calculation

Color Tools

Color Luminance Calculator

Online Color Luminance calculation

Color Tools

Color Grayscale Calculator

Online Color Grayscale calculation

Color Tools

CSS Gradient Generator

Generate CSS linear and radial gradients

Color Tools

Color Blindness Simulator

Simulate how colors appear to people with color vision deficiency

Color Tools

Color Harmony Generator

Generate harmonious color schemes based on color theory

Color Tools

Tailwind Color Finder

Find the closest Tailwind CSS color class for any color

Color Tools

Image Color Extractor

Extract dominant color palette from uploaded images

Color Tools

Image

Color Mixer

Blend two colors and generate smooth gradient transitions

Color Tools

OKLCH Explorer

Explore modern OKLCH and OKLAB CSS color spaces

Color Tools

Random Color Generator

Generate beautiful random color palettes with lock support

Color Tools

Image to CSS Gradient

Extract dominant colors from images and generate CSS gradients

Color Tools

Interview Guide

Markdown CV

Resume written in Markdown

Interview Guide

Developer Tools

Apifox

Team API management tool

Developer Tools

Front-end Tech Stack Icons

SVG icons for front-end technology stack

Developer Tools

Semver Range Query

Semver version range query

Developer Tools

Tree Structure Generator

Online tree structure generator from Markdown lists

Developer Tools

UserAgent Parser

Online browser User-Agent parser

Developer Tools

Random User-Agent Generator

Generate random browser User-Agent strings for testing and scraping

Developer Tools

OCR Optical Character Recognition

Free online OCR tool supporting text recognition in multiple languages, based on Tesseract.js technology

Image

Developer Tools

IEEE 754 Illustration

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

Developer Tools

UUID Generator Online

UUID v4/v7 generator online with batch create and validation

Developer Tools

File Type Detector

Detect file type based on binary magic numbers

Developer Tools

IP Info

Developer Tools

JWT Decode Online

JWT decode online—parse headers, payloads, and verify signatures

Developer Tools

Encoding and Hashing

JWT Encoder

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

Developer Tools

Encoding and Hashing

Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa

Developer Tools

SVG Editor & Optimizer

Edit, preview, and optimize SVG files with real-time compression

Image

Developer Tools

Favicon Generator

Generate all favicon sizes from a single image, with HTML code snippets

Image

Developer Tools

Password Generator

Generate secure random passwords, PINs, and Diceware passphrases

Developer Tools

Encoding and Hashing

JSON Formatter

Format, minify, and sort JSON directly in the browser

Developer Tools

Text Diff Checker

Compare two text blocks line by line and highlight edits

Developer Tools

Timezone Converter

Convert datetimes between UTC and world timezones with DST-aware offsets

Developer Tools

Convert

SiteKeeper Website Time Tracker

Chrome extension: auto-track time per site, set daily limits & smart blocking, with path analysis and productivity score

Developer Tools

Image

Image Color Extractor

Extract dominant color palette from uploaded images

Color Tools

Image

Image Grayscale Generator

Image Grayscale generator

Image

TinyImage - Fast Image Compressor

Fast image compressor with no size or quantity limits

Image

Image Format Converter

Batch convert images between PNG, JPG, and WebP with quality control and ZIP download

Image

Convert

MicroGallery - Personal Image Hosting

Use Github repository as your personal image hosting

Image

Image Placeholder API

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

Image

Image DataURL Generator and Previewer

DataURL Generator & DataURL Preview

Image

QR Code Generator

Real-time online QR code generation

Image

JPEG Metadata Viewer & Stripper

View and strip EXIF metadata from JPEG images

Image

OCR Optical Character Recognition

Free online OCR tool supporting text recognition in multiple languages, based on Tesseract.js technology

Image

Developer Tools

Image Share Link Generator

Online generator for image sharing links

Image

SVG Editor & Optimizer

Edit, preview, and optimize SVG files with real-time compression

Image

Developer Tools

Favicon Generator

Generate all favicon sizes from a single image, with HTML code snippets

Image

Developer Tools

ASCII Art Generator

Convert images to ASCII character art

Image

Image Watermark

Add text watermarks to images with customizable position, opacity, and style

Image

Background Remover

Manually brush to erase image background, export transparent PNG

Image

Encoding and Hashing

Symmetric Encryption

Comprehensive symmetric encryption algorithms

Encoding and Hashing

Base64 Encode & Decode

Base64 encode and decode online with UTF-8 and visual breakdown

Encoding and Hashing

Unicode To Code Point

Convert Unicode to Code Point

Encoding and Hashing

Unicode To UTF-8

Unicode to UTF-8 conversion with internal principle demonstration

Encoding and Hashing

Unicode To UTF-16

Unicode to UTF-16 conversion with internal principle demonstration

Encoding and Hashing

Unicode To UTF-32

Unicode to UTF-32 conversion with internal principle demonstration

Encoding and Hashing

URL Encoding

Free online URL encoding and decoding service

Encoding and Hashing

HTML Entity Encoding

Free online HTML entity encoding and decoding service

Encoding and Hashing

Hash Generator

Online generation of MD5, SHA1, SHA256, SHA512

Encoding and Hashing

ASCII Table

ASCII code table

Encoding and Hashing

JWT Decode Online

JWT decode online—parse headers, payloads, and verify signatures

Developer Tools

Encoding and Hashing

JWT Encoder

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

Developer Tools

Encoding and Hashing

Password Generator

Generate secure random passwords, PINs, and Diceware passphrases

Developer Tools

Encoding and Hashing

Convert

Image Format Converter

Batch convert images between PNG, JPG, and WebP with quality control and ZIP download

Image

Convert

Binary Converter

Convert between binary, octal, and hexadecimal

Convert

Timezone Converter

Convert datetimes between UTC and world timezones with DST-aware offsets

Developer Tools

Convert

Table

Markdown Table Generator

Convert between Markdown tables, CSV, and JSON formats

Table

Code

CSV to Markdown Table

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

Table

JSON to Markdown Table

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

Table

Markdown Table to CSV

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

Table

Markdown Table to JSON

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

Table

CSV to JSON

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

Table

JSON to CSV

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

Table

CSV to HTML Table

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

Table

CSV to LaTeX Table

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

Table

CSV to SQL INSERT

Online CSV to SQL INSERT converter, quickly convert CSV data to SQL INSERT statements, with copy and download support

Table

CSV to YAML

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

Table

Excel to CSV

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

Table

Excel to HTML Table

Online Excel to HTML table converter, quickly convert Excel spreadsheet data to HTML table format, with copy and download support

Table

Excel to JSON

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

Table

Excel to Markdown Table

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

Table

HTML Table to CSV

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

Table

HTML Table to JSON

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

Table

HTML Table to LaTeX

Online HTML table to LaTeX converter, quickly convert HTML table data to LaTeX table format, with copy and download support

Table

HTML Table to Markdown

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

Table

HTML Table to SQL INSERT

Online HTML table to SQL INSERT converter, quickly convert HTML table data to SQL INSERT statements, with copy and download support

Table

HTML Table to YAML

Online HTML table to YAML converter, quickly convert HTML table data to YAML format, with copy and download support

Table

JSON to HTML Table

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

Table

JSON to LaTeX Table

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

Table

JSON to SQL INSERT

Online JSON to SQL INSERT converter, quickly convert JSON data to SQL INSERT statements, with copy and download support

Table

JSON to YAML

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

Table

Markdown Table to HTML

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

Table

Markdown Table to LaTeX

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

Table

Markdown Table to SQL INSERT

Online Markdown table to SQL INSERT converter, quickly convert Markdown table data to SQL INSERT statements, with copy and download support

Table

Markdown Table to YAML

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

Table

YAML to CSV

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

Table

YAML to HTML Table

Online YAML to HTML table converter, quickly convert YAML data to HTML table format, with copy and download support

Table

YAML to JSON

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

Table

YAML to LaTeX Table

Online YAML to LaTeX table converter, quickly convert YAML data to LaTeX table format, with copy and download support

Table

YAML to Markdown Table

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

Table

YAML to SQL INSERT

Online YAML to SQL INSERT converter, quickly convert YAML data to SQL INSERT statements, with copy and download support

Table

CSV Generator

Online CSV table generator, create CSV tables by specifying rows and columns, with copy and download support

Table

HTML Table Generator

Online HTML table generator, create HTML tables by specifying rows and columns, with copy and download support

Table

JSON Generator

Online JSON table generator, create JSON data by specifying rows and columns, with copy and download support

Table

LaTeX Table Generator

Online LaTeX table generator, create LaTeX tables by specifying rows and columns, with copy and download support

Table

Markdown Table Generator Page

Online Markdown table generator, create Markdown tables by specifying rows and columns, with copy and download support

Table

SQL INSERT Generator

Online SQL INSERT statement generator, create SQL INSERT statements by specifying rows and columns, with copy and download support

Table

SEO

Title/Description Pixel Length Checker

Pixel-accurate Title and Description length checker with live SERP preview

SEO

Open Graph Preview

Preview how your page looks when shared on Facebook, Twitter, LinkedIn and more

SEO