Check implementation details
Header, HMAC, token, and encoding tools help verify small pieces of security-sensitive configuration before they are copied into code or documentation.
16 tools
Security tools for passwords, tokens, headers, and network ranges
Use these tools to check entropy, inspect tokens, work through CIDR math, generate headers, and handle common security-related implementation tasks faster.
Entropy and token utilitiesNetwork and addressing mathHeader and transport helpers
Practical guide
How to use these security tools
Security utilities on Utiluno focus on implementation support: entropy estimates, tokens, network ranges, headers, and encoding helpers. They can improve day-to-day checks, but they do not replace threat modeling, code review, audits, or organization-specific security requirements.
Reason about entropy and lifetime
Password, token, nonce, and session tools make length, randomness, and expiration assumptions explicit.
Inspect network ranges
CIDR and IP tools are useful when reviewing allowlists, subnet plans, firewall rules, or cloud networking changes.
Before you rely on a result
- Do not paste real private keys, production secrets, or sensitive customer data into any browser utility.
- Verify generated values and headers against your framework, browser support, and deployment environment.
- Treat entropy and TTL outputs as planning signals, not as a complete security assessment.
Common mistakes to avoid
- Confusing encoding with encryption or signing.
- Using a generated example value as a long-term production secret.
- Assuming a header recommendation fits every application without testing it in context.
Tool library
Choose a calculator or utility
Password Entropy Calculator
Estimate password entropy from length and character set assumptions.
Open
Bcrypt Cost Estimator
Estimate the relative work factor increase created by changing bcrypt cost rounds.
Open
HMAC Generator
Generate an HMAC signature from a message, secret, and algorithm in the browser.
Open
CIDR Subnet Calculator
Inspect an IPv4 CIDR block and calculate its subnet mask, network address, broadcast address, and usable host range.
Open
Subnet Mask to CIDR Converter
Convert an IPv4 subnet mask into its CIDR prefix length.
Open
IP Range Calculator
Calculate the size of an IPv4 range between a starting IP address and an ending IP address.
Open
Base64URL Encoder
Encode text into URL-safe Base64 using the Base64URL character set used by JWTs and other web-safe formats.
Open
Base64URL Decoder
Decode a Base64URL string into readable plain text.
Open
Basic Auth Header Generator
Generate the HTTP Basic Authorization header value from a username and password.
Open
HSTS Max-Age Converter
Convert HSTS max-age values between seconds and longer time units for easier policy review.
Open
Session TTL Calculator
Convert session lifetime settings into multiple time units and calculate expiry from a duration.
Open
Random Token Generator
Generate a cryptographically random token in hex, Base64URL, or UUID-style formats.
Open
API Key Entropy Calculator
Estimate the entropy of an API key format from its length and character set size.
Open
Password Generator
Generate a random password with configurable length and character set options.
Open
SRI Hash Generator
Generate a Subresource Integrity hash string from script or style content.
Open
CSP Nonce Generator
Generate a random Content Security Policy nonce value for inline script or style allowlisting.
Open