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Free cybersecurity tools, calculators, and resources for IT professionals across security, network, developer, planning, media, compliance, and assessment categories
Encrypt and decrypt text or files with AES-256-GCM, AES-CBC, or AES-CTR. Runs in your browser.
Encrypt and decrypt with affine cipher (ax + b mod 26). Includes brute force mode and modular inverse calculator
Ancient Hebrew reverse alphabet cipher (A↔Z, B↔Y). Self-inverse cipher with visual alphabet mapping
Encode and decode Base64, Hex, Binary, and other formats with file support
Self-reciprocal polyalphabetic cipher similar to Vigenère. Same operation encrypts and decrypts with C = (K - P) mod 26
Interactive FAR/FRR curves with sensitivity slider, CER calculation, and modality comparison for CISSP Domain 5 (IAM)
Detect and analyze CORS misconfigurations, security vulnerabilities, and policy issues
Generate Content Security Policy headers with nonce/hash support and validation
Search CVEs, visualize vendor trends, analyze response times, and calculate CVSS scores
Calculate CVSS v3.1 vulnerability scores with Base, Temporal, and Environmental metrics. Generate vector strings and ...
Calculate CVSS v3.1 vulnerability scores with Base, Temporal, and Environmental metrics. Generate vector strings and ...
Look up Common Weakness Enumeration entries from MITRE with detailed mitigations and Top 25 list
Encrypt and decrypt text with Caesar cipher (ROT-N), frequency analysis, auto-detection, and visual cipher wheel
Decode and encode Caesar cipher text online. Brute force all 25 shifts, frequency analysis, auto-detection, and inter...
Generate CSRs, convert between PEM/DER/PFX/P7B formats, and verify certificate chains - 100% client-side
Build complete SSL/TLS certificate chains automatically. Upload your certificate and fetch missing intermediate CA ce...
Search Certificate Transparency logs for SSL/TLS certificates and subdomains
Auto-detect cipher types from ciphertext using frequency analysis, Index of Coincidence, and pattern matching
Collection of classical cipher tools for encryption, decryption, and cryptanalysis including Caesar, Vigenère, and su...
Analyze HTTP cookies for security issues and privacy concerns
See why ECB encryption mode is insecure through pixel-level visualization. Compare ECB vs CBC with interactive Canvas...
Generate DMARC records with step-by-step wizard, preset templates, and deployment roadmap
Query DNS records with email security analysis and health scoring
Educational simulator demonstrating how database inference and aggregation attacks work, and how countermeasures prot...
Comprehensive domain security scan: SSL/TLS, security headers, email authentication, DNS health, HTTPS enforcement, b...
Detect homograph attacks and typosquatting. Analyze suspicious domains or generate protective variants
Validate SPF, DKIM, and DMARC records with security grading and recommendations
Analyze email headers for SPF/DKIM/DMARC validation, routing, and security threats
Generate professional email templates for incident response, disaster recovery tests, maintenance notifications, secu...
Validate email syntax, MX records, disposable domains, and provider risk scoring
Detect and decode nested encodings (Base64→Hex→URL→ROT13). Visualize decoding chains for CTF and forensics
Interactive WWII Enigma cipher machine simulator with authentic rotors (I-V), reflectors, plugboard, and signal visua...
Calculate Shannon entropy to detect packed, encrypted, or obfuscated malware in binary files
Select the right federation protocol (SAML, OIDC, OAuth, Kerberos) with visual auth flow diagrams, protocol compariso...
Identify true file types by analyzing magic numbers and detect extension spoofing
Check emails and passwords against known data breaches
Interactive developer tool for constructing, sending, and analyzing HTTP requests directly from the browser
Generate cryptographic hashes (MD5, SHA-256, SHA-512) for files and text. Check malware with VirusTotal integration.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text and files. Check malware hashes with VirusTotal integration.
Look up hash values to identify known malware and file signatures
Binary file viewer and editor with hex/ASCII display, search, bookmarks, and byte editing
Matrix-based polygraphic cipher using linear algebra. Supports 2×2 and 3×3 key matrices with inverse calculator
Extract indicators of compromise (IPs, domains, URLs, hashes) from threat intel
Look up geographic location, ISP, and threat intelligence for IP addresses
Check IP reputation, geolocation, and threat intelligence with fraud detection
Create customized IR playbooks aligned with NIST SP 800-61 for ransomware, data breaches, DDoS, supply chain compromi...
Decode and analyze JSON Web Tokens with security validation
Decode and inspect JWT tokens instantly. View header, payload, and verify signatures with security validation.
Validate K8s manifests against CIS Kubernetes Benchmark security checks. Detect privileged containers, missing resour...
Explore MITRE ATT&CK tactics and techniques for threat hunting
Disassemble x86/ARM/RISC-V machine code with assembler, shellcode detection, call graphs, and performance analysis
Multi-technique deobfuscation tool for malware analysis with auto-detection and chaining
NIST SP 800-88 decision-tree wizard that recommends Clear, Purge, or Destroy methods based on media type, data sensit...
Visual Metasploit command generator with module presets, payload selector, and console command reference
Map NIST Cybersecurity Framework 2.0 controls to CIS Controls v8, ISO 27001:2022, and SOC 2 Trust Services Criteria
Visual Nmap command generator with preset templates and intelligent results parser
Debug OAuth 2.0 and OpenID Connect flows with JWT decoder, PKCE generator, flow tester, and error troubleshooting
Extract OCSP responder URLs and CRL distribution points from X.509 certificates. Check certificate revocation status
Theoretically unbreakable cipher with random key generation. XOR encryption with perfect secrecy when used correctly
Test regular expressions online with live matching, pattern explanations, and a built-in regex library. Supports Java...
Generate PGP/GPG key pairs (Curve25519, RSA, NIST curves) with fingerprints and QR codes - 100% client-side
Generate secure random passwords with customizable options
Check how strong your password is with entropy analysis, crack time estimates, and breach database checks via Have I ...
Digraph substitution cipher using 5×5 keyword matrix. Includes visual matrix and encoding rules
Understand public/private key cryptography through visual analogies - padlock, color mixing, and mailbox demos. No ma...
Encode and decode text using ROT13 and Caesar cipher
Decode ROT13 instantly or crack Caesar ciphers with brute force solver. Encode with custom shifts (1-25). Free online...
Interactive RSA encryption with small primes. See key generation, encryption, decryption step-by-step. Break RSA to u...
Transposition cipher that writes text in zigzag pattern. Visual diagram and brute force mode included
Trace HTTP redirect chains and analyze response headers for debugging
Test regular expressions with pattern library and explanations
Generate Software Bill of Materials (SBOM) in CycloneDX and SPDX formats for supply chain security and EO 14028 compl...
Build detection queries for Splunk SPL, Elastic KQL, and Microsoft Sentinel. Includes presets for authentication, net...
Generate SPF records with automatic DNS lookup counter and optimization
Generate Subresource Integrity hashes for scripts and stylesheets
Generate SSH key pairs (Ed25519, RSA, ECDSA) with fingerprints and randomart visualization - 100% client-side
Generate SSH key pairs (Ed25519, RSA, ECDSA) with fingerprints and randomart visualization. 100% client-side — keys n...
Run quick or deep SSL scans to verify certificate chains, protocol support, and common configuration issues
Detect exposed API keys, tokens, private keys, and database credentials in code. 100% client-side scanning.
Test HTTP security headers and get security scores with actionable recommendations
Evaluate which formal security model (Bell-LaPadula, Biba, Clark-Wilson, Brewer-Nash) best fits your requirements wit...
Extract ASCII and Unicode strings from binary files for malware analysis with IOC pattern detection
Monoalphabetic substitution cipher with interactive solving assistant, frequency analysis, and pattern finder
Desktop app for filesystem analysis and security auditing with SSH scanning (macOS, Windows, Linux)
Aggregate IOCs from multiple feeds, deduplicate indicators, and export collections for investigations
Build complete threat models with STRIDE decomposition, DREAD scoring, auto-generated threat libraries, and prioritiz...
Defang and refang URLs, IPs, and domains for threat intelligence
Expand shortened URLs safely and analyze redirect chains with security checks
Polyalphabetic cipher with Kasiski examination, Index of Coincidence analysis, key recovery, and Tabula Recta visuali...
Query domain registration information, expiration dates, and nameservers
Decode and analyze SSL/TLS certificates with security validation
Free XOR encryption and decryption online. Encrypt text, decode XOR ciphertext, brute force cryptanalysis
Parse and analyze robots.txt files with path testing and security checks
Generate .env files with templates for Next.js, Express, Django, Laravel, AWS, Stripe, Firebase, and other platforms
Generate customized .gitignore files by combining templates for languages, frameworks, IDEs, and operating systems
Generate aws s3 sync, cp, and mv commands with the right flags. Build complex S3 CLI commands without memorizing syntax
Generate Microsoft Graph PowerShell commands for Azure AD user management, group operations, MFA status, and license ...
Calculate AWS Bedrock costs for Claude, Llama, Titan, and other AI models. Estimate input/output token costs for your...
Calculate optimal RTO/RPO targets, analyze downtime costs, and compare backup strategies with cost-benefit analysis
Conduct a Business Impact Analysis (BIA) to identify critical functions, assess impact by category, calculate recover...
Estimate cloud emissions by provider and region, then model rightsizing and greener deployment scenarios to reduce ca...
Assess CI/CD pipeline security across secrets management, SAST/DAST, artifact signing, SLSA framework, and deployment...
Interactive cloud security benchmark for AWS, Azure, and GCP with instant remediation guidance and compliance insights
Evaluate your security posture across 9 domains and get a personalized improvement roadmap
Build data classification policies with Government or Commercial schemas, handling rules per level, compliance overla...
Look up BGP Autonomous System information by ASN or find which AS an IP address belongs to
Build firewall rulesets, test packets against rules, compare stateful vs stateless filtering, and analyze rule orderi...
Convert between IPv4 and IPv6 address formats instantly. Supports IPv4-mapped, 6to4, Teredo, and format conversion.
Convert between IPv4 and IPv6 address formats. Supports IPv4-mapped, 6to4, and format conversion between compressed a...
Convert CSV files to JSON format instantly with browser-based processing
Convert between JSON, YAML, XML, TOML, and CSV with real-time validation
Convert Excel spreadsheets to JSON with multi-sheet support and custom formatting options
Convert YAML to JSON or JSON to YAML with full support for comments and anchors
Convert text and images to ASCII art. Text-to-ASCII with 200+ FIGlet fonts, image-to-ASCII with color output, edge de...
Generate placeholder text and images for designs. Create Lorem Ipsum in 6 themes plus placeholder images from 7 provi...
Generate realistic fake test data (names, emails, addresses, credit cards, UUIDs) with JSON, CSV, and SQL export
Convert page counts between book trim sizes (8.5×11 to 6×9), calculate words per page, estimate spine width, and veri...
Compare cloud computing costs across AWS, Azure, and Oracle Cloud. Get instant pricing estimates for compute instance...
Find out if your small business needs basic antivirus, EDR, or managed MDR with personalized recommendations
Advanced MAC address analyzer with instant OUI lookup, batch processing, vendor search, duplicate detection, binary v...