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๐ Formatters & Converters
10JSON Formatter
Validate, format, and minify JSON data.
Timestamp Converter
Convert Unix timestamps to human dates.
Color Converter
Convert HEX, RGB, and HSL colors.
Unit Converter
Convert length, weight, and more.
Config Converter
Convert between YAML, TOML, and JSON.
Text Case Converter
Convert text case (camel, snake, etc).
Code Minifier
Minify JS, CSS, and HTML code.
Image Converter
Convert and resize images locally.
SQL Formatter & Validator
Format SQL and catch common syntax issues. Supports Postgres/MySQL-friendly formatting (offline).
SVG Optimizer & Editor
Clean up and preview SVGs, then quickly adjust fill/stroke colors โ all locally.
๐ก๏ธ Security & Crypto
13Password Generator
Create secure, random passwords.
SSH Key Generator
Generate RSA and ECDSA SSH keys.
X.509 Certificate Inspector
Parse X.509 certificates and CSRs.
Token Cryptography Suite
Inspect, generate, and manage JWT tokens and cryptographic keys.
Encoding & Decoding Workbench
Encode, decode, hash, and identify data transformations.
SAML Inspector
Decode SAML requests and responses.
OAuth 2.0 / PKCE Debugger
Generate PKCE challenges, visualize OAuth flows, and analyze security.
Htpasswd Entry Generator
Generate apache htpasswd entries.
Log Masker
Redact PII from logs locally.
Email Security Analyzer
Understand SPF, DKIM, DMARC, routing hops, and embedded URLs from a raw email โ all locally.
Env Var Manager
Compare .env files across environments and generate a share-safe (masked) diff.
CSP Header Builder
Build a Content-Security-Policy header with clear explanations and safety checks.
Secret Scanner
Scan pasted code/config for leaked API keys, tokens, and passwords โ then generate a share-safe redaction.
๐ Network & Web
10IP Subnet Planner
Calculate IPv4/IPv6 subnets and ranges.
DNS Record Reference
Interactive reference for DNS record types with syntax, examples, and command builders.
Port Reference
Searchable IANA port database with security risk levels and protocol filters.
HTTP Status Reference
Search HTTP status codes with usage, safety, idempotency, and cacheability guidance.
Bandwidth Calculator
Calculate transfer times, bandwidth needs, and TCP overhead.
Webhook Debugger
Capture, inspect, and replay webhook payloads locally in your browser.
WireGuard Config Studio
Generate WireGuard configurations with local key generation and QR export.
Wireshark Filter Builder
Build Wireshark display filters and BPF capture expressions visually.
Protocol Header Visualizer
Interactive bit-level diagrams for Ethernet, IPv4, IPv6, TCP, UDP, ICMP, and ARP.
User-Agent Parser
Parse and analyze User-Agent strings.
โก Generators
4๐ ๏ธ Utilities
16Text Diff
Compare two text files for differences.
Regex Studio
Visualize, explain, and test regular expressions with real-time diagrams.
Cron Builder
Visual cron editor with human-readable descriptions and next-run preview.
Markdown Editor
Split-pane Markdown editor with sync scroll and GFM support.
Log Viewer
Analyze large log files locally with filtering and visualization.
Curl Studio
Parse and generate curl commands.
Mermaid Studio
Live Mermaid.js diagram editor.
JSON Schema Studio
Generate JSON Schema from JSON.
Caffeinate
Keep your device screen awake using the Wake Lock API. No downloads, fully client-side.
Token Counter & Cost Estimator
Estimate token counts for GPT, Claude, and Llama families and calculate cost with your pricing.
Prompt Template Builder
Generate a clean, reusable prompt template optimized for GPT, Claude, and other chat models.
Public Repos YAML Builder
Generate repos.yml inventories and audit snippets for public repo automation.
Public Repos Not Automation
Decide which public repository tasks should stay manual and generate a no-automation decision record.
Review Description Generator
Generate structured PR review and comment descriptions from commits, diffs, or notes.
Pipe Mode
Chain tools together. Your data never leaves your browser.
Changelog
Release history and recent changes to SimpleTool.
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