JA3 Fingerprint: Your TLS Identity

Detect your browser's unique cryptographic signature. See your JA3 MD5 hash and the TLS parameters that websites use to identify bots vs humans.

AI Overview

A JA3 Fingerprint is a unique string generated from your browser's TLS handshake. It combines your TLS version, cipher suites, and extensions into an MD5 hash. Unlike an IP address, this signature stays the same even if you use a VPN, making it a primary tool for bot detection and security monitoring.

TLS Version

TLS 1.2

Ciphers Offered

11 Groups

SSL Extensions

15 Active

CRYPTO_ID_CHECK

Your JA3 Hash (MD5)

5c38df56e8eb8728afac571bdcd847e1

Raw JA3 String

771,4865-4866-4867-49195-49199-49196-49200-52393-52392-49171-49172,0-23-65281-10-11-35-16-5-13-18-51-45-43-27-21,29-23-24,0

What is a JA3 Fingerprint?

A JA3 Fingerprint is an invisible way to identify your browser or application. When you connect to an encrypted website, your browser sends a Client Hello packet. This packet lists your cryptographic preferences. JA3 takes these details and creates a consistent MD5 hash that serves as your digital fingerprint.

Privacy Alert: A VPN does not change your JA3 fingerprint. The server still sees the same browser handshake, meaning your identity can be tracked across different IP addresses.

How the JA3 Hash is Generated

The JA3 algorithm extracts five specific fields from the TLS handshake to create a unique identifier:

  • TLS Version: The protocol version your browser supports.
  • Cipher Suites: The list of encryption algorithms offered.
  • SSL Extensions: Extra features like Server Name Indication (SNI).
  • Elliptic Curves: Mathematical groups used for secure key exchange.
  • Curve Formats: How the elliptic points are encoded.

JA3 for Bot Detection

Modern security systems use JA3 fingerprinting to stop bots. If a request claims to be a Chrome browser but its JA3 hash matches a Python script, the server knows it is a bot and blocks it. This is highly effective for preventing web scraping and brute-force attacks.

Frequently Asked Questions

Does my JA3 fingerprint change?
Yes. Your fingerprint will change if you update your browser, switch to a different one (like Firefox), or update your operating system.

Is JA3 a unique personal ID?
No. Millions of people using the same version of Chrome on the same OS will share the same JA3 hash. It identifies your browser type, not your name.

What is JA4?
JA4+ is the newer version of this protocol. It is more accurate for TLS 1.3 and modern HTTP/2 or HTTP/3 connections.