UC Mode (Undetected Chromedriver)

UC Mode launches Chromium with stealth flags and applies JavaScript evasions that mask navigator.webdriver, plugins, WebGL, and other fingerprints. Removing the automation markers from the chromedriver binary itself is a separate step that you run yourself (below).

Quick enable#

Set the driver mode to Uc in BrowserConfig:

use seleniumbase_rs::{BaseCase, BrowserConfig, DriverMode};#[tokio::main]async fn main() -> Result<(), Box<dyn std::error::Error>> {    let mut sb = BaseCase::new(        BrowserConfig::default().with_mode(DriverMode::Uc),    ).await?;    sb.open("https://example.com").await?;    sb.quit().await?;    Ok(())}

sbrs --uc open https://example.com

Binary patching#

Even in UC mode, a stock chromedriver may inject cdc_ variables into every page.

Patch the executable before launch to strip those signatures:

cargo run --bin sbrs -- patch-chromedriver --path /path/to/chromedriver

use seleniumbase_rs::stealth::patcher::patch_chromedriver;# fn main() -> Result<(), seleniumbase_rs::SeleniumBaseError> {patch_chromedriver("/path/to/chromedriver")?;# Ok(())# }

See Binary Patching for the full API, backup/restore, and safety notes.

Engine spoofing arguments#

The engine_spoofing_args() helper returns Chromium flags that disable automation features such as --disable-blink-features=AutomationControlled. Pass them through BrowserConfig or StealthOptions:

use seleniumbase_rs::{engine_spoofing_args, BrowserConfig, DriverMode};let config = BrowserConfig::default()    .with_mode(DriverMode::Uc)    .with_extra_args(engine_spoofing_args());

Still detected?#

If a site still flags the browser:

Troubleshooting#

Next steps#