ThumbmarkJS is a privacy-conscious and equitable fingerprinting library crafted specifically with developers in mind. Licensed under MIT, it is easily accessible through NPM or via jsDelivr, and with just a few lines of JavaScript, you can import the UMD bundle and utilize tm.get() to obtain a reliable 32-character thumbmark fingerprint. For smaller applications that demand enhanced accuracy, there is a complimentary API version available, while the Pro version offers scalable and economical solutions for extensive applications. With no complicated installation processes or intrusive tracking methods, ThumbmarkJS has successfully been adopted by over 60,000 websites, facilitating more than 1 billion identifications and enjoying around 200,000 downloads each month. The library is not only free and open source but also serves as a viable alternative to FingerprintJS. It effectively creates unique, enduring device fingerprints by leveraging web APIs like canvas, audio, and fonts, enabling the recognition of browsers across different sessions. This functionality makes it a powerful tool for developers seeking a straightforward and effective way to implement browser identification without sacrificing user privacy.