JOHLEM

security tools & cheatsheets

61 tools available. No registration required.

🌐

DNS Mapper

Map DNS infrastructure with visual network graphs, subdomain discovery, and ASN lookup

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Phishing Checker

Analyze URLs, domains, and content for phishing indicators and typosquatting

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Email Header Analyzer

Analyze email headers for phishing indicators, spoofing, and security threats

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Hash Generator & Verifier

Generate and verify cryptographic hashes (MD5, SHA-256, SHA-512, and more)

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File Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes from files for VirusTotal lookups

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CIDR Calculator

Calculate IP ranges, subnets, and network addressing for infrastructure planning

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IOC Defanger

Safely defang and refang malicious indicators for secure SOC sharing

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JWT Decoder

Decode and analyze JSON Web Tokens for security issues and debugging

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Password Generator

Generate cryptographically secure passwords and passphrases with entropy analysis

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Base64 Converter

Encode and decode Base64 text and files with URL-safe variant support

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JSON Formatter

Validate, format, and beautify JSON with syntax highlighting and tree view

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IP Info

Analyze IPv4/IPv6 addresses with binary representation and range detection

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Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa

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Regex Tester

Test regular expressions with highlighting, pattern library, and ReDoS protection

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HTTP Request Builder

Build HTTP requests and export as cURL, fetch, Python, PHP, and more

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Diff Tool

Compare two texts with side-by-side diff and unified format output

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CSV Converter

Parse CSV/TSV data and convert to JSON, SQL, HTML, or Markdown tables

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Character Encoder

Encode text to Hex, Binary, URL, HTML entities, and Unicode escapes

QR Code Generator

Generate QR codes for URLs, WiFi, contacts, and more with custom colors

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Color Converter

Convert colors between HEX, RGB, HSL, CMYK with WCAG contrast checker

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Markdown Preview

Write Markdown with live preview and export as HTML or Markdown file

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Text Statistics

Analyze text for word count, readability scores, and keyword density

Cron Parser

Parse cron expressions, see next run times, and build schedules visually

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Certificate Decoder

Decode SSL/TLS certificates to view subject, issuer, validity, and extensions

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SQL Formatter

Format, beautify, and minify SQL queries with syntax highlighting

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Unix Permissions Calculator

Calculate Unix/Linux file permissions (chmod) with visual editor

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User Agent Parser

Parse browser user agent strings to extract browser, OS, and device information

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UUID Generator

Generate and validate UUIDs (v1, v4) with bulk generation support

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URL Parser

Parse URLs into components, encode/decode, and build URLs from parts

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Bcrypt Generator

Hash passwords with bcrypt and verify existing hashes securely

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MAC Address Lookup

Look up MAC address vendor/manufacturer from OUI database

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Security Headers Checker

Analyze HTTP security headers of any website with scoring and recommendations

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Robots.txt Analyzer

Parse and analyze robots.txt files with URL testing and validation

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CSP Builder

Build Content-Security-Policy headers with visual interface and presets

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String Case Converter

Convert text between camelCase, snake_case, kebab-case, PascalCase, and more

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MIME Type Lookup

Look up MIME types by file extension for correct Content-Type headers

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Subnet Calculator

Calculate subnet information from IP/CIDR with network address, broadcast, and host range

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Favicon Generator

Generate favicons from text, emojis, or solid colors in multiple sizes

.htaccess Generator

Create Apache .htaccess files with security, caching, and rewrite rules

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Server Config Validator

Validate Apache and Nginx configuration syntax with best-practice checks

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Mod_Rewrite Tester

Test Apache mod_rewrite rules and see URL transformations

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Port Lookup

Look up network port information, security status, and common usage

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Binary/Hex/Decimal Calculator

Convert between number bases with step-by-step explanations and arithmetic

📰

Security Feeds

Aggregated security news, CVEs, and threat intel from 40+ sources (CISA, NVD, CERTs, vendors)

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Link Extractor

Extract and list all links from any webpage with filtering and export options

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SSL Certificate Checker

Analyze SSL/TLS certificates with trust score, expiration alerts, and legitimacy indicators

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NATO Phonetic Converter

Convert text, hex, UUIDs, and hashes to NATO phonetic alphabet for clear verbal communication

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Meeting Time Zone Converter

Convert meeting times across timezones with business hours visualization and calendar export

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ICS Calendar Generator

Create .ics calendar event files compatible with Apple Calendar, Google Calendar, Outlook, and Thunderbird

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HTTP Status Code Reference

Complete searchable reference of HTTP response status codes with descriptions and use cases

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ASCII Table

Complete ASCII character reference with decimal, hex, octal, and binary values

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Slug Generator

Generate URL-friendly slugs from text with SEO options and bulk mode

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Lorem Ipsum Generator

Generate placeholder text for design mockups in various formats and lengths

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Epoch Batch Converter

Convert multiple Unix timestamps at once with timezone support and CSV export

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Hash Identifier

Identify cryptographic hash algorithms from hash strings (MD5, SHA, bcrypt, etc.)

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Encoding Detector

Detect and decode text encodings (Base64, URL, Hex, HTML entities, Unicode)

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Email Security Checker

Check SPF, DKIM, and DMARC records to validate email authentication

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WHOIS Lookup

Look up domain registration information using RDAP (registrar, dates, nameservers)

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ASCII Banner Generator

Generate ASCII art text banners for MOTD, scripts, and terminal displays

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IP Geolocation & Privacy Checker

Geolocate any IP address, view your browser fingerprint, and detect VPN/proxy usage with privacy analysis

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SecOps Response Generator

Generate professional security operations response emails and ticket descriptions from 100+ templates across 13 categories

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Free security tools provided as-is for educational and professional use. No warranty provided. These tools query publicly available information - use responsibly and in accordance with applicable laws.
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