Online Developer Tools Directory / 工具总目录

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FEATURED · AI AGENT CONFIGURATION

MCP Config Doctor & Converter

Paste Claude, Cursor, VS Code or Gemini JSON—or Codex TOML—to catch wrapper, transport, argument and credential errors. Convert the validated definition to another client without uploading it.

Validate an MCP configBrowse AI agent tools
JSON ↔ TOML6 clientsSecret warningsRuns locally

百分比计算
Percentage Calculator

根据两个数计算百分比。
Calculate percentage from two numbers.

纯本地 PDF 魔法工具箱
PDF Toolkit - Free Online PDF Tools

Merge, split, compress and convert PDFs online for free.

关键词组合、匹配类型检查与 Editor CSV 导出
Keyword Combiner & Google Ads Match Type Formatter — CSV

Combine four keyword lists, create ordered permutations, format positive or negative match types, catch duplicates and export Google Ads Editor CSV locally.

密码强度检查
Password Strength Checker

密码强度评估。
Check password strength.

密码生成器
Password Generator - Create Strong Random Passwords Online

Generate strong random passwords locally in your browser.

日期差计算
Date Diff Calculator

计算两个日期差值。
Calculate date differences.

时间戳转换工具
Unix Timestamp Converter - Convert Seconds, Milliseconds and Date Online

Convert Unix timestamps to readable dates and dates to timestamps.

随机 Hex 生成
Random Hex Generator

随机生成 Hex 字符串。
Generate random hex strings.

随机抽取
Random Picker

随机抽取列表项。
Randomly pick list items.

随机数生成
Random Number Generator

随机数批量生成。
Generate random numbers.

在线 JWT 解码器
JWT Decoder - Decode JSON Web Tokens Online

Decode JWT tokens and inspect header, payload and expiration time locally.

在线纯本地解压工具
ZIP Extractor - Open and Extract ZIP Files Online

Open, inspect and extract ZIP files directly in your browser.

字节单位转换
Bytes Converter

字节单位互转。
Convert bytes/KB/MB/GiB values.

AI API Cost Calculator — Compare LLM Token Pricing

Estimate GPT-5.6, Claude 5, Gemini, DeepSeek and Grok API costs by requests, input/output tokens, cache hits and Batch pricing.

AI App Production Readiness Review — Evidence Checklist

Review AI-generated apps for release blockers across auth, data, secrets, supply chain, observability, rollback and AI controls.

AI Bot Access Auditor
AI Bot Access Auditor

Parse robots.txt groups and report the root-path policy visible to common AI search and training tokens.

AI Crawler Robots.txt Generator & Auditor

Generate and audit robots.txt policies for OAI-SearchBot, GPTBot, ClaudeBot, Claude-SearchBot, PerplexityBot and Google-Extended with path tests.

AI Prompt Helper - Optimize ChatGPT & Claude Prompts

Optimize ChatGPT and Claude prompts for better AI responses.

AI Video Prompt Repair
AI Video Prompt Repair

Rewrite AI video prompts to reduce safety rejection, distortion, and inconsistency.

Base64 编码 / 解码工具
Base64 Encoder & Decoder - Encode and Decode Text Online

Encode text to Base64 or decode Base64 back to plain text instantly.

ChatGPT Apps manifest checker
Apps SDK Manifest Validator

Validate ChatGPT Apps and MCP app metadata for OAuth, widget, CSP, and tool result mistakes.

Code Mode fit assessment
MCP Code Mode Readiness Checker

Check whether an MCP server is a good fit for Code Mode, tool routing, or normal tool calling.

Color Converter & WCAG Contrast Checker — OKLCH Palette

Convert HEX, RGB, HSL, HWB and OKLCH colors.

ComfyUI Error Decoder — CUDA OOM, NaN, Missing Nodes & Models

Paste a redacted ComfyUI or PyTorch log to classify the first causal error, extract CUDA OOM telemetry, identify the likely workflow stage, and get an ordered fix plan.

Cron 表达式解析器
Cron Expression Parser - Explain and Test Cron Schedules Online

Parse and explain cron expressions with next scheduled run times.

CSS 单位转换器
CSS Unit Converter - px/rem/em/vw/vh

Convert between CSS units - px, rem, em, vw, vh, percentage and more.

dependabot.yml 生成器
Dependabot Config Generator

Generate Dependabot config files for GitHub automated dependency updates.

Docker Compose Online Generator

Generate Docker Compose YAML files online for multi-container applications.

EasyStencil — 免费 Gerber 转 3D 打印钢网工具介绍

是 Stenchill 的中文介绍页：免费在线 Gerber 转 3D 打印焊膏钢网工具。
EasyStencil Stenchill ： Gerber 3D 。 ZIP STL/3MF， KiCad/Eagle/Altium。

Emoji Search & Copy — Unicode 17 Names and Code Points

Search and copy 3,944 Unicode Emoji 17.0 entries by English or Chinese name, keyword, category, version, glyph or code point.

Encoding & Data Conversion Workbench — Base64URL, Hex, JSON, CSV

Run 24 local encoding and data transforms in one workbench: Base64URL, hex, binary, Unicode and JSON escapes, CSV, JSON arrays, query strings and data URLs.

Estimate MCP schema context cost
MCP Token Budget Analyzer

Estimate MCP tool schema size and identify context bloat before loading many servers into an agent.

Gitignore 生成
Gitignore Generator

按技术栈生成 .gitignore 片段。
Generate .gitignore snippets by stack.

Hash Generator - MD5, SHA-1, SHA-256 and SHA-512 Online

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes locally in your browser.

HTML 本地预览与安全检查
HTML Preview & Safety Inspector — Sandboxed Live Preview

Preview HTML locally in a sandboxed iframe and inspect titles, headings, meta descriptions, image alt text, scripts, event handlers and unsafe URLs.

HTML 转义与反转义工具
HTML Entity Encoder & Decoder Online

Encode and decode HTML entities instantly.

JavaScript Regex Tester — Matches, Groups, Replace & Timeout

Test JavaScript regex safely in a timeout-isolated worker.

JSON 格式化 & 校验工具
JSON Formatter & Validator - Format, Validate and Minify JSON Online

Format, validate, beautify and minify JSON online.

JSON Diff Online - Compare JSON Files Side by Side

Compare two JSON objects and highlight differences side by side.

JWT 过期检查
JWT Expiry Checker

快速检查 JWT 过期时间。
Check JWT expiration quickly.

llms.txt Generator, Validator & Sitemap Importer

Build and validate llms.txt locally, or turn pasted Sitemap XML into a curated link inventory.

Lorem Ipsum Generator — Paragraphs, Words, Lines & HTML

Generate exact Lorem Ipsum paragraphs, sentences, words or lines as text or HTML.

Markdown 表格生成器
Markdown Table Generator - Create and Format Markdown Tables Online

Create, format and convert Markdown tables online.

MCP Config Validator & Converter — Claude, Cursor, Codex

Validate and convert MCP configs for Claude, Cursor, VS Code, Codex and Gemini.

NanoID 生成
NanoID Generator

生成 NanoID。
Generate NanoID values.

Official MCP Server Registry Browser & Trust Checklist

Search the live official MCP Registry, inspect packages, remote transports and secret fields, then run a five-point safety review before connecting a server.

Passkey Readiness
Passkey Readiness Checker

Statically check login HTML or implementation notes for passkey autofill and conditional mediation signals.

PCB 制造文件完整性预检与报告
Gerber ZIP Preflight Checker — Layers, Drill, Units & Report

Check a Gerber ZIP locally for missing PCB layers, drill files, mixed units, duplicate roles and outline mismatch.

Playwright MCP and CDP triage
Browser Agent Debug Checklist

Classify browser agent failures involving CDP endpoints, closed browsers, captcha, snapshots, and lost sessions.

QR Code Generator — Wi-Fi, vCard, SVG & PNG

Create QR codes locally for URLs, text, Wi-Fi, vCard contacts, email and phone.

Remote MCP OAuth checklist
MCP OAuth Debugger

Inspect MCP OAuth callback URLs, headers, token claims, and session hints without uploading data.

SameSite CHIPS Cookie
SameSite CHIPS Cookie Checker

Parse each Set-Cookie header independently and flag invalid SameSite, Secure, Partitioned, and cookie-prefix combinations.

SQL IN 构建
SQL IN Clause Builder

多行值构建 SQL IN 语句。
Build SQL IN clause from lines.

Stripe Webhook Signature
Stripe Webhook Signature Checker

Statically review webhook code for Stripe-Signature extraction, constructEvent verification, raw-body handling, and unsafe ordering.

Supabase RLS Checklist
Supabase RLS Checklist

Parse Supabase SQL for explicit RLS enable/disable statements, policies, exposed roles, and service-role secret risks.

Text Diff Checker — Side-by-Side & Unified Diff

Compare two texts locally with side-by-side line numbers, inline changes, ignore options, statistics and downloadable unified diff output.

Text Transformation Workbench — Case, Lines & Extractors

Use 34 local text operations in one workbench: change case, build identifiers, clean and sort lines, add prefixes, extract URLs or emails, and inspect characters.

Trim verbose tool schemas
MCP Tool Schema Minifier

Remove noisy MCP schema fields, whitespace, and long descriptions for context budget review.

Typing Speed Test — 1, 3, 5 Minute WPM & Accuracy

Take a private 1, 3 or 5 minute typing speed test.

URL 编码 / 解码工具
URL Encoder & Decoder - Percent Encode and Decode URLs Online

Encode and decode URLs with percent-encoding for special characters.

UUID Generator — Secure v4, UUIDv7, Bulk Export & Validator

Generate secure UUID v4 and RFC 9562 UUID v7 batches.

Vibe App Risk
Vibe App Risk Scanner

Review an AI-generated app summary for missing production evidence across auth, data, payments, secrets, deployment, and recovery.

Vite Import Path Checker — Rollup Failed to Resolve Import

Check a failing Vite import against a pasted project-file inventory, aliases and dependencies to catch exact-case, missing-file, alias and package problems locally.

VRAM Model Fit & OOM Headroom Calculator for ComfyUI

Screen a ComfyUI workload for VRAM pressure or parse a real PyTorch OOM line without pretending that every model has one exact memory requirement.

WebAuthn Error
WebAuthn Error Decoder

Classify WebAuthn DOMException names and return likely causes plus the next discriminating checks.

What Does AI Know About You? — Search Your Digital Footprint

Curious what AI knows about you?

Word Counter — Unicode Characters, Reading Time & Density

Count locale-aware words, Unicode graphemes, code points, bytes, sentences and paragraphs.

YouTube 标签生成与格式化工具
YouTube Tags Generator & SEO Optimizer

Generate SEO-optimized YouTube tags from keywords instantly.