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Many tools process your input entirely in the browser instead of sending it to an application server.
Free security tools for builders
Security tools for developers, engineers, and security teams.
Inspect certificates, decode JWTs, generate hashes, analyze TLS, work with keys, and troubleshoot security data directly from your browser.
40+ toolsNo signup requiredPrivacy-consciousBuilt for practical workflows
Popular tools
Start with the tools developers use most
Jump directly into common security workflows without creating an account or installing additional software.
Web Security
SSL/TLS Checker
Inspect live TLS configuration, certificate chains, protocols, ciphers, HSTS, and security findings.
Open toolPKI
Certificate Decoder
Decode X.509 certificates and inspect subject, issuer, validity, algorithms, key details, and fingerprints.
Open toolAuthentication
JWT Inspector
Decode and inspect JWT headers, payloads, claims, timestamps, and common security issues.
Open toolCryptography
Hash Generator
Generate SHA-256, SHA-384, SHA-512, and other cryptographic hashes locally in your browser.
Open toolWeb Security
Website Security Scanner
Review public websites for HTTPS, security headers, TLS configuration, redirects, and common issues.
Open toolPKI
CSR Decoder
Decode PKCS#10 certificate signing requests and inspect subjects, SANs, public keys, and extensions.
Open toolBrowse by category
A toolbox for everyday security work
Explore tools by workflow, from PKI and cryptography to authentication, web security, encoding, and network utilities.
PKI & Certificates
Inspect certificates, CSRs, OCSP, CRLs, certificate chains, PKCS#7, PKCS#12, and key material.
Explore toolsCryptography
Generate hashes, HMACs, keys, fingerprints, integrity values, and other cryptographic outputs.
Explore toolsAuthentication
Decode and inspect JWTs, validate tokens, generate TOTP codes, and work with JWK and JWKS data.
Explore toolsWeb Security
Analyze TLS, security headers, CSP, SRI, HTTP behavior, and public website security configuration.
Explore toolsEncoding & Data
Encode and decode Base64 and URLs, format JSON, convert timestamps, and work with common developer data.
Explore toolsNetwork & Recon
Run DNS lookups, inspect IP and CIDR information, and review public network-related data.
Explore toolsWhy Security Toolbox
Practical security utilities without unnecessary friction
Tools designed for quick investigation, troubleshooting, development, and security workflows.
Built for real workflows
Inspect certificates, verify hashes, decode tokens, review TLS, and troubleshoot security configurations.
No account required
Open a tool and start working immediately without registration, onboarding, or unnecessary setup.
Useful context
Results include structured details, findings, and practical context instead of only raw output.
Certificate workflow
Working with an X.509 certificate?
Decode the certificate, inspect its chain, review revocation information, and test the live TLS endpoint using connected tools.
Start with Certificate DecoderSecurity guides
Learn the workflow behind the tools
Practical guides for certificates, TLS, PKI, and website security, with direct links to the tools used in each workflow.
Guide
How to Decode an X.509 Certificate Online
Learn how to inspect certificate subjects, issuers, SANs, validity, public keys, fingerprints, and extensions.
Read guideGuide
How to Check an SSL/TLS Certificate Online
Learn how to inspect certificate validity, TLS protocols, ciphers, trust chains, HSTS, and expiry.
Read guideGuide
How to Decode a CSR Online
Understand PKCS#10 certificate signing requests, subjects, SANs, public keys, signatures, and extensions.
Read guideGuide
How to Check Website Security Headers
Review CSP, HSTS, MIME protection, referrer policy, permissions policy, and clickjacking controls.
Read guideFAQ
Frequently asked questions
What is Security Toolbox?
Security Toolbox is a collection of practical browser-based utilities for developers, engineers, and security teams working with certificates, TLS, JWTs, cryptography, encoding, and web security.
Do I need an account?
No. The tools are designed to be opened and used directly without creating an account.
Is my data uploaded?
Many tools process data entirely in your browser. Tools that require live network inspection clearly indicate when a server-side request is required.
Are the tools free?
Yes. Security Toolbox provides free utilities for practical security and developer workflows.
Find the security tool you need
Explore 40+ free tools for certificates, cryptography, authentication, web security, encoding, networking, and everyday developer workflows.
Free to use · No account required · Privacy-conscious