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LLMS.txt

Theo chuẩn llms.txt, tệp văn bản thuần này cung cấp cho tác nhân AI và mô hình ngôn ngữ một chỉ mục nhanh chóng, đáng tin cậy về trang web: mọi công cụ, điểm cuối API và bài viết kèm mô tả ngắn. Trỏ tác nhân của bạn tới https://csr.plus/llms.txt để bắt đầu.

# 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