DevToolbox

Universal document converter supporting Markdown, Word (Docx), PDF, HTML, LaTeX, EPUB, RTF, RST, MediaWiki, and hundreds more.

Optimize PDF images and fonts locally using the Ghostscript engine. Efficient batch processing with maximum privacy.

Browser-based SQL lab powered by SQLite WASM. Supports live execution, code formatting, and various database operation examples.

Edit PDF online, support adding text, images, signatures, watermarks, and free drawing

Powerful Go AI powered by KataGo engine. Features real-time analysis, win-rate prediction, and multiple levels.

Online chess game with Stockfish WASM engine, supporting multiple difficulty levels and position analysis

Traditional Chinese Chess (Xiangqi) against intelligent AI

Play Gomoku against AI with various difficulty levels, runs locally in browser

Extract text from images locally in your browser, supports 10+ languages including CJK, no upload needed

P2P file transfer using WebRTC, end-to-end encrypted

1-to-N file sharing via WebRTC, generate QR to let multiple clients download

Professional and simple online resume builder with PDF export

Lookup your public IP address information and geographic location

Convert Markdown to Word (.docx) with full support for math, tables, code blocks, and more

Online screen and audio recorder supporting full screen, window, or tab capture.

Professional online video editor with multi-track support, splitting, joining, and exporting.

Professional online media player supporting MP4, WebM, MP3, FLAC and more, with fullscreen, PiP, speed control

Convert audio/video formats in browser. Supports MP4, WebM, AVI, MOV, MKV, MP3, WAV, FLAC, AAC and more

Compress and extract ZIP, GZIP archives online, entirely in your browser for privacy

Auto generate video subtitles locally in your browser using AI, ensuring your privacy.

Real-time weather forecast and air quality for global cities

Casio-style online scientific calculator supporting various math operations

Parse JWT headers, payloads, and signatures

Generate QR codes from text or URLs

Encode and decode text to/from Base64

Convert between Unix timestamps and dates

Convert between characters and Unicode encoding

Convert text to/from ASCII (Dec, Hex, Bin) and reference table

Universal unit converter for length, mass, area, volume, temperature, etc.

Convert between CSS units (px/rem/em/%)

Convert JSON objects to TypeScript interface definitions

Real-time counter for words, characters, lines, CJK characters, reading time

A versatile online document editor supporting DOCX import, auto-centered images, font size control, infinite scrolling, and multiple themes.

Quickly convert between CSV and JSON formats

Mutual conversion and formatting between JSON, YAML, TOML, and XML

Convert Protobuf text format messages to JSON

Format, compress, and validate JSON data with syntax highlighting

Real-time Markdown preview with GFM support

Online LaTeX editor with real-time preview, text rendering, zoom, and PDF export

Online Mermaid diagram renderer with support for flowcharts, sequence diagrams, gantt charts and more, with various theme configurations and SVG/PNG export

Professional Graphviz (DOT) renderer supporting all syntax and multiple layout engines (dot, neato, circo, etc.), with template library and SVG/PNG export

Interactive ECharts playground with real-time JSON editing, various templates for line, bar, pie, radar charts, and professional color themes

Perfectly convert Markdown text to PDF documents with custom styles

Test regex online with real-time highlighting

Compare two pieces of text and highlight differences line by line

Parse User Agent strings for browser, OS, and device info

Preview Excel (.xlsx, .xls) and CSV files online

Obfuscate Javascript code to make it harder to read

Parse raw HTTP header strings into structured data with detailed info

URL encoding and decoding

Convert between HTML special characters and entities

Calculate MD5, SHA-1, SHA-256, SHA-512 hashes

AES encryption and decryption using Web Crypto API

Generate HMAC hashes with a secret key

Asymmetric encryption using RSA public keys

Generate Bcrypt hashes and verify passwords against hashes

Parse SSL certificates in PEM format to view details

Generate UUID v4 with batch support

Generate secure random passwords

Convert between HEX, RGB, HSL, and OKLCH

Visually generate and parse Cron expressions

Convert text to creative ASCII art styles

Convert images to Base64 and vice versa

Efficient batch and bulk image compression tool. Adjust quality and dimensions locally in your browser for maximum privacy.

Convert between PNG, JPG, and WebP

Smart image background removal, quickly extract subjects from images

Smart background removal and color replacement for ID photos

Real-time SVG preview and basic code optimization

Pick HEX and RGB color values from uploaded images

Check if text and background colors meet WCAG standards

All-in-one CSS visual designer integrating multiple generators.

Visually generate CSS Flexbox layouts with real-time preview

Visually design CSS Grid layouts and generate code

All-in-one visual tool to merge, split, reorder, rotate or remove PDF pages with ease

Convert multiple images to a single PDF, with support for reordering and page settings

Calculate the future value of savings or investments with compound interest

Calculate monthly payments and total interest for loans

Mortgage calculator supporting commercial, provident fund, and combined loans with LPR support.

Generate a unique fingerprint based on browser features to understand privacy exposure

Query DNS records (A, AAAA, CNAME, MX, TXT, NS, etc.) for any domain

Test network latency and compare multiple nodes

P2P video call using WebRTC, end-to-end encrypted, no server mediation

Online crop, resize, blur, and basic editing tool

Global timezone conversion and visual comparison

A lightweight online eBook reader, supports importing local EPUB files

Calculate Body Mass Index (BMI), assess weight health status, provide ideal weight reference

Online HTML/CSS/JS sandbox with React, Vue, Tailwind support and console output

Professional online Favicon generator. Create favicons from text, emojis, or images and export all sizes instantly.

High-performance RISC-V ISA simulator with real-time assembly debugging and execution.

Online tool to create exam cheatsheets by automatically arranging text to maximize space, supports PDF export.

Play Othello against AI, test your strategy with this classic board game

Play Checkers against AI, test your strategy with this classic game

Powerful Backgammon AI powered by GNU Backgammon WASM engine with world-class neural network evaluation

Locally execute Python, JavaScript, C/C++, Ruby, PHP using WebAssembly. Write, compile, and run code directly in your browser.

Professional online typing practice and speed test tool. Supports English/Chinese, multiple modes, and real-time accuracy statistics.

Real-time speech recognition powered by Whisper AI. Record from microphone and auto-generate meeting notes, summaries, and action items 100% locally.

Create mind maps online with dual outline/visual views, beautiful themes, and multiple export options.

Recognize text in PDF documents and export to TXT, supports multi-page processing and 10+ languages, runs locally

Full-featured Typst online editor with live preview, math, tables, graphics, and one-click PDF export

Privacy-focused free temporary email service. Protect privacy and prevent spam.

All-in-one timer: real-time clock, stopwatch, and countdown — all with fullscreen support

Professional HLS/M3U8 live stream online player and testing tool, supporting quality switching, playback speed, and stream analytics.

Create animated GIFs from images or videos with full control over FPS, resolution, text overlays, and more. 100% local.

Powerful Text to Speech tool using the native Web Speech API. Automatically detects system voices and supports WAV export.