Java Captcha

A mature, object-oriented language and virtual machine used worldwide for portable enterprise, web and embedded software.TrustCaptcha integrates seamlessly into any Java stack, delivering privacy-friendly, GDPR-compliant protection through proof-of-work and an adaptive bot-score.

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TrustCaptcha is the privacy friendly and user focused CAPTCHA for Java

Security & Bot-ScoreTrustCaptcha combines a proof-of-work with a bot score — similar to the reCAPTCHA score — and custom security configurations for maximum security. Learn more about the CAPTCHA security concept

Privacy Friendly & GDPR-CompliantTrustCaptcha is a privacy-first CAPTCHA solution with a clear focus on data protection and GDPR compliance. Learn more about the GDPR-compliant CAPTCHA

CustomizationAll features of the CAPTCHA widget are fully customizable such as translations or design. The branding or the entire widget can also be hidden. Learn more about the customization

AccessibilityThe CAPTCHA completely dispenses with puzzles or image marking tasks. The CAPTCHA works fully automated and complies with international accessibility standards. Learn more about the accessibility

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Integrate TrustCaptcha in Java

Integrate TrustCaptcha with Java quickly and easily into your website, application or platform in just a few steps and effectively protect your online presence and services from bot abuse.

1 – Sign in or sign up
The first thing you need to do is sign in to your Trustcomponent account. If you do not yet have a Trustcomponent account, you can register with us quickly and easily in just a few steps. After that, go to your dashboard. Here you will see all existing CAPTCHAs and can create new CAPTCHAs.
2 – Choose existing CAPTCHA or create a new CAPTCHA
If you already have a CAPTCHA that you want to use, skip this step. If you don't have a CAPTCHA yet, create a new CAPTCHA now.Create a new CAPTCHADuring the creation process, select the “TrustCaptcha” product category and choose your preferred pricing plan. If you are not yet sure which pricing plan to choose, no problem! The plan can be extended at any time. Then decide whether you want to start with the 30-day trial version or go straight to a paid subscription. If you want to start directly with a paid CAPTCHA, all you have to do is add your billing details and optionally a payment method and you're ready to go.30-day trail periodIf you opt for the 30-day trial period, you can test CAPTCHA for 30 days risk-free. At the end of the 30-day trial period, CAPTCHA locks itself. During the 30-day trial period or up to 30 days after the end of the trial period, you can unsubscribe from CAPTCHA at any time for a fee or delete it with immediate effect. If you neither subscribe to the CAPTCHA for a fee nor delete it within 30 days of the end of the free trial period, it will be deleted automatically.Non-Commercial PlanIn addition to our standard plans, we also offer a permanently free “Non Commercial“ plan with 1 website and up to 500 free verifications for non-commercial websites and projects.
3 – Add your websites and check your credentials
On the dashboard of your CAPTCHA you will find all the important information, statistics and setting options. Here you will also find your site-key, the secret-key and, if available, the license-key. You will need these later on when integrating your CAPTCHA.Add your websitesYour CAPTCHA may only be accessed by websites that you explicitly authorise. To allow websites to access the CAPTCHA, enter all the websites on which you want to integrate the CAPTCHA in the settings.
4 – Solve the CAPTCHA in your frontend
Integrate the CAPTCHA widget into your website or app. You can find detailed instructions for the frontend integration in our documentation. The CAPTCHA widget will then be displayed on your website or app.
Prebuild frontend integrationsYou can use one of our pre-built integrations to integrate the CAPTCHA widget into your website or application. If there is no pre-built integration from us for your preferred frontend technology, your software developers can integrate the CAPTCHA themselves using our documentation or ask our support-team for a pre-built integration solution.
5 – Validate the CAPTCHA result in your backend
When the CAPTCHA has finished, take the verification token and send it to your backend. Then retrieve the verification result from our servers and determine your next steps. You can find detailed information on backend integration in our documentation.Basic steps for JavaThe basic steps for your Java integration are as follows. For detailed instructions, please read our documentation.Install Dependency
Select a tab
MavenGradle GroovyGradle KotlinGradle Sbt
Fetch Result
Select a tab
Fetch Result
Handle Result
Select a tab
Handle Result
Other backend technology instead of Java?If you do not want to use Java or have several backend services you can select a different language or framework here. If there is no pre-built integration from us for your preferred backend technology, your software developers can integrate the CAPTCHA themselves using our documentation or ask our support-team for a pre-built integration solution.
6 – Congratulations 🎉
You are now protected by TrustCaptcha - congratulations!

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Frequently Asked Questions

What is a Java CAPTCHA?

A Java CAPTCHA is a challenge-response test that you embed in a Java-powered website or API to confirm a visitor is human before your code continues. It combines a short client-side task (or an automatic proof-of-work puzzle in TrustCaptcha’s case) with a server-side verification routine written in Java.

What is the best Java CAPTCHA?

The best choice balances security, privacy, speed and flexibility, and TrustCaptcha excels by uniting a dynamic proof-of-work, an AI-driven bot-score and fine-grained security policies in one widget. It is fully EU-hosted and GDPR-compliant out of the box, sparing you the complex data-transfer assessments other tools require. Pure proof-of-work competitors such as FriendlyCaptcha focus on slowing bots rather than detecting them, so they miss threats that TrustCaptcha’s layered approach can flag.

How does a Java CAPTCHA work?

In TrustCaptcha the browser silently solves a cryptographic puzzle whose difficulty adapts to the visitor’s risk profile, while parallel algorithms collect device and behaviour signals to calculate a bot-probability score. Your Java backend then posts the token to TrustCaptcha’s API and receives a signed verdict (human, suspicious or bot) that you can act on in milliseconds. This two-step design gives stronger security than puzzle-only CAPTCHAs without adding friction for legitimate users.

Do I need a Java CAPTCHA?

If your Java application accepts form submissions, registrations, payments or API calls exposed to the public internet, a CAPTCHA is the fastest way to block credential-stuffing, spam and scraping bots. Industry data shows bots routinely bypass simple rate limits, so a dedicated human-verification layer is recommended for risk-sensitive flows. TrustCaptcha can be added in minutes and runs fully automatically, so genuine users rarely notice it.

Is TrustCaptcha GDPR-compliant?

Yes—TrustCaptcha is designed according to Privacy-by-Design principles, stores and processes all data exclusively in EU datacentres and offers an online Data-Processing Agreement (DPA) and SLA that you can sign in seconds. Unlike reCAPTCHA, no personal data is sent to third-country servers, and the widget sets no cookies by default, keeping your consent banners simple.

How does TrustCaptcha stop bots better than proof-of-work-only CAPTCHAs?

Proof-of-work alone merely slows automated scripts, but sophisticated bots with GPU power can still slip through. TrustCaptcha layers an AI bot-score and custom rules (IP allowlists, geo-blocking, difficulty scaling) on top of the puzzle, giving you multiple independent signals to act on and pushing bot costs far higher. The result is measurably higher detection rates than single-layer solutions.

Can I customise TrustCaptcha in my Java app?

Absolutely—the widget supports 35+ languages, light/dark/auto themes, full colour overrides and even complete white-labelling, so it blends seamlessly with any Java-powered UI. You can toggle visibility, auto-start behaviour, size and custom privacy links via simple HTML attributes or Java config, and all options are WCAG 2.2 accessible.