Free Developer Tools

SSL Checker

Verify SSL certificate validity and expiration for any domain.

Is It Down?

Check if a website is accessible from our servers right now.

HTTP Status Checker

Check what HTTP status code any URL returns.

DNS Lookup

Query DNS records (A, AAAA, CNAME, MX, TXT) for any domain.

Test Endpoints

HTTP endpoints that return specific status codes for testing.

HTTP Headers Checker

View all HTTP response headers from any URL.

JSON Validator

Validate, format, and minify JSON with syntax highlighting.

Base64 Encoder/Decoder

Encode and decode Base64 strings instantly.

URL Encoder/Decoder

URL encode and decode strings for safe transmission.

UUID Generator

Generate random UUIDs (v4) for your applications.

Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Cron Expression Generator

Build and validate cron expressions with a visual editor.

Subnet Calculator

Calculate network address, broadcast, and host ranges from CIDR.

CIDR Calculator

Convert between CIDR notation and IP ranges.