SREKit — Free Online Tools for Site Reliability Engineers

Privacy-focused utilities for SREs. Most tools run entirely in your browser — your data never leaves your machine.

Available Tools

• Base64 — Encode and decode Base64 strings online. Supports Unicode text and runs entirely in your browser.
• JWT Decoder — Decode and inspect JSON Web Tokens (JWT) online. View header, payload, and expiration — client-side only.
• JSON Formatter — Format, validate, and minify JSON online. Pretty-print with custom indentation — runs in your browser.
• YAML ↔ JSON Converter — Convert between YAML and JSON formats online. Bidirectional conversion with validation — client-side.
• Timestamp Converter — Convert Unix timestamps to human-readable dates and vice versa. Supports multiple date formats.
• Text Diff — Compare two texts side by side and highlight differences. Character-level diff — runs in your browser.
• UUID Generator — Generate UUID v1 (timestamp) and v4 (random) identifiers online. Bulk generation supported.
• DNS Lookup — Look up DNS records for any domain. Query A, AAAA, MX, TXT, CNAME, and NS records.
• WHOIS Lookup — Look up WHOIS information for any domain. View registrar, expiry date, name servers, and more.
• SSL Checker — Check SSL/TLS certificates for any domain. View certificate chain, expiry, and validity status.