TLS & JA4 Browser Fingerprint Tester
Inspect your browser or automated bot's unencrypted ClientHello packet in real-time. Analyze modern JA4 and legacy JA3 digests, Akamai HTTP/2 frame signatures, cipher suites, and anti-bot evasion trust scores for Cloudflare Turnstile and reCAPTCHA v3.
User-Agent matches the low-level TLS cryptographic cipher order and HTTP/2 frames.JA4 TLS Fingerprint (Modern WAF Standard)
JA3 Digest (Salesforce MD5)
Legacy fingerprinting format. In Chrome, JA3 rotates randomly due to dynamic extension shuffling.
Akamai HTTP/2 Fingerprint
Ordered list of symmetric and asymmetric encryption algorithms offered by your client in the ClientHello. Anti-bot engines flag scrapers if Python OpenSSL or Node.js default ciphers appear with a Chrome User-Agent.
| # | Cipher Suite Name (RFC) | Standard |
|---|---|---|
| Loading cipher suites... | ||
Why Cloudflare Turnstile & reCAPTCHA v3 Block Automated Bots
When automating form submissions or web data extraction, changing your User-Agent header is no longer enough. Cloudflare Turnstile, DataDome, and reCAPTCHA inspect the TLS ClientHello packet at the transport layer before any application payload is parsed:
| Client Stack | TLS Engine | JA4 Signature | Turnstile Behavior | reCAPTCHA Score |
|---|---|---|---|---|
| Python requests / urllib3 | OpenSSL 3.0 | t13i0015h1_... | Blocked Instantly (403) | 0.1 (Definite Bot) |
| Node.js axios / undici | Node crypto (OpenSSL) | t13d1715h1_... | Blocked Instantly (403) | 0.1 (Definite Bot) |
| Stock Headless Chromium | BoringSSL | t13d3112h2_... | Looping Interactive Challenge | 0.3 (Suspicious) |
| ⚡ 2Captcha API & Cloud Browser (Rank #1) | Full Human Telemetry | t13d3112h2_e8f1e7... | 100% Pass (No Challenge) | 0.9 (Human Score) |
2Captcha API & Cloud Browser
Global leader in automated CAPTCHA resolution. Solves Cloudflare Turnstile, reCAPTCHA v2/v3/Enterprise, DataDome, and AWS WAF with guaranteed token responses and 100% genuine browser TLS handshakes.
xCaptcha (xCap) AI Engine
Specialized ConvNeXt neural network engine achieving sub-2s latency on complex image and spatial puzzle challenges without browser overhead. Full 2Captcha protocol compatibility.
How Cloudflare Turnstile & reCAPTCHA Audit Your TLS Handshake
Before a single line of JavaScript or CAPTCHA challenge HTML is sent to your client, the target web server conducts an unencrypted cryptographic handshake. In this TCP ClientHello packet, your browser announces its supported TLS protocol versions, cryptographic cipher suites, and protocol extensions.
Because Google Chrome compiles against Google's BoringSSL library, it presents a distinct, randomized set of GREASE ciphers, extension permutations, and HTTP/2 settings frames. Open-source scraping libraries (Python Requests, urllib3, Go net/http, Node.js axios) use OpenSSL, which produces fixed, easily detectable TLS signatures.
Why JA4 is the Gold Standard for Anti-Bot Telemetry
In 2023, FoxIO open-sourced JA4 to replace legacy JA3. Unlike JA3 (which produced erratic hashes in Chrome due to extension shuffling), JA4 sorts extensions and ciphers alphabetically before calculating its signature. As a result, anti-bot engines like Cloudflare Turnstile, DataDome, and Akamai can reliably distinguish real human browsers from automated scripts in microseconds.
Frequently Asked Questions
Does rotating residential proxies bypass Turnstile TLS fingerprinting?
No. Proxies route your TCP traffic, but your local machine still negotiates the TLS handshake directly with Cloudflare. If your script uses Python Requests or stock Playwright without humanized TLS flags, Turnstile will still block your requests regardless of IP quality.
What is the easiest way to solve Turnstile when TLS is blocked?
Use an automated solver API like 2Captcha or xCaptcha. Rather than dealing with local BoringSSL compilations and CDP leaks, the solver API executes the validation on authentic browser infrastructure and returns the verified token directly to your code.