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LLMS.txt

Following the llms.txt standard, this plain-text file gives AI agents and language models a quick, reliable index of the site: every tool, API endpoint and article with a short description. Point your agent to https://csr.plus/llms.txt to get started.

# CSR.plus

> Free, privacy-first online SSL/TLS certificate tools. All cryptographic operations run locally in your browser — private keys never leave your device. Available in 13 languages (en, zh, zh-Hant, es, fr, de, ja, ko, ru, it, ar, vi, th).

## Tools

- [CSR Generator](https://csr.plus/tools/csr-generator): Create CSR (RSA 2048/4096, ECDSA P-256/P-384) with optional SANs, directly in the browser.
- [CSR Decoder](https://csr.plus/decoder): Parse CSR subject, public key and full X.509v3 extensions.
- [SSL Certificate Checker](https://csr.plus/check): Check certificate validity, expiry, chain and hostname coverage for any domain.
- [Bulk SSL Checker](https://csr.plus/bulk): Check up to dozens of domains in one request.
- [SSL Monitor](https://csr.plus/monitor): Track certificate expiry and renewal health over time.
- [SSL/TLS Tracer](https://csr.plus/tools/ssl-tracer): Trace the exact TLS handshake, protocols and cipher suites.
- [Certificate Inspector](https://csr.plus/tools/cert-inspector): Inspect a full certificate chain, key usage and extensions.
- [OpenSSL Trace](https://csr.plus/openssl-trace): Simulate and explain OpenSSL commands step by step.
- [Uptimeless](https://csr.plus/uptimeless): Browser-based website uptime monitoring with local history.
- [SSL Toolkit](https://csr.plus/tools): Growing set of free SSL/TLS utilities.

## API

- [CSR Generation API](https://csr.plus/api): Free REST API to generate CSRs programmatically. No signup, no API keys.
- [API Reference](https://csr.plus/docs/api): POST /api/generate endpoint, parameters, response format, error codes and rate limits.

## Articles

- [SSL/TLS Statistics 2026](https://csr.plus/articles/ssl-tls-statistics-2026): Report with TLS 1.3 adoption, CA market share and certificate trends. (13 languages)
- [What is OCSP Stapling](https://csr.plus/articles/what-is-ocsp-stapling): Guide to OCSP stapling, handshake latency and how to enable it. (13 languages)
- [TLS 1.2 Deprecation 2026](https://csr.plus/articles/tls-1-2-deprecation-2026): News: Apple/Google/Mozilla cutover timeline and what site owners must do. (13 languages)
- [How to Generate a CSR](https://csr.plus/articles/how-to-generate-csr)
- [SSL Certificate Guide 2026](https://csr.plus/articles/ssl-certificate-guide)
- [RSA vs ECDSA](https://csr.plus/articles/rsa-vs-ecdsa)
- [Common SSL Errors](https://csr.plus/articles/common-ssl-errors)
- [SSL Security Best Practices](https://csr.plus/articles/ssl-security-best-practices)
- [Ultimate Guide to CSR and SSL Certificates](https://csr.plus/articles/ultimate-guide-csr-plus-ssl-certificate)
- [Why Website Security Matters](https://csr.plus/articles/why-website-security-matters)
- [CSR.plus vs Traditional Methods](https://csr.plus/articles/csr-plus-vs-traditional-methods)
- [Common SSL Certificate Problems Solved](https://csr.plus/articles/common-ssl-certificate-problems-solved)

## Pages

- [Home](https://csr.plus/)
- [About](https://csr.plus/about)
- [Privacy Policy](https://csr.plus/privacy)
- [Terms of Service](https://csr.plus/terms)

## Facts

- Domain: csr.plus
- All tools are free and run client-side; no private key data is ever uploaded.
- Contact: support [at] csr [dot] plus