Security and compliance APIs: Aadhaar masking, face match, fraud checks
Mask Aadhaar numbers to UIDAI norms, watermark documents, match a selfie to the ID and screen risk signals before you onboard.
Includes
- Protect sensitive Aadhaar details with instant masking.
- Secure documents with dynamic watermarks to prevent misuse.
- APIs that are lightweight, accurate, and easy to integrate.
What you can verify
2 APIs
- Face matchVerified
ID photo
Selfie
Faces matchedSimilarity confidenceVery high similarity91.4%Face Match
Verify customer identity by matching selfies with official ID photos in seconds.
- Compares two facial images and returns a similarity score.
- Prevent impersonation and identity fraud.

Watermark(Document Security)
Protect sensitive documents with secure watermarking.
- Prevent unauthorized sharing or tampering.
- Enhance trust in digital documents.
Why FastKYC
Simple and Secure Data Protection
Our Security & Compliance APIs safeguard sensitive identity information with Aadhaar Masking and Document Watermarking, ensuring privacy, compliance, and trust. Here’s why businesses rely on us:

Aadhaar Masking
Automatically hide Aadhaar numbers while retaining the last 4 digits, ensuring compliance with UIDAI guidelines and protecting user privacy.
Document Watermarking
Securely stamp documents with customizable watermarks to prevent duplication, forgery, and unauthorized use.
Fraud Prevention
Prevent identity misuse by ensuring that customer data is always protected and compliant with the latest regulations.
Secure Encryption & Compliance
Backed by enterprise-grade encryption and regulatory compliance, FastKYC ensures sensitive information stays private and tamper-proof at every step.
Know your business
In today’s compliance-driven landscape, protecting customer data is just as important as verifying it. With FastKYC Security & Compliance APIs, you can safeguard sensitive information, prevent misuse, and stay fully compliant with regulations.
Aadhaar Masking
Automatically hide Aadhaar numbers while keeping only the last 4 digits visible, ensuring UIDAI compliance and protecting customer privacy.
Watermarking Documents
Apply customizable watermarks on identity documents to prevent forgery, duplication, and unauthorized usage.
Prevent Data Misuse
Ensure that sensitive identity data cannot be exploited, keeping your onboarding process secure and trustworthy.
Stay Compliant with Confidence
Built with enterprise-grade encryption and aligned with regulatory frameworks, FastKYC ensures your business meets the highest security standards.
Security & Compliance APIs(Aadhaar Masking, Watermark)
Keep the identity data you collect safe to store and hard to misuse. Mask Aadhaar numbers on card images, watermark documents against reuse, match a selfie to the ID photo and screen applicants for risk signals before you onboard them.
Privacy Protection
Mask Aadhaar numbers to safeguard customer identity and meet UIDAI compliance standards.
Document Integrity
Apply watermarks to official IDs and documents to prevent forgery or unauthorized use.
Fraud Prevention
Screen mobile numbers, IP addresses and identity data for fraud and risk signals before approval
Secure Data Handling
Enterprise-grade encryption ensures customer information remains private and protected end-to-end
Common questions about Aadhaar Masking & Document Security APIs
What is Aadhaar masking?
Masking hides the first eight digits of the twelve-digit Aadhaar number on a card image and leaves the last four visible. The Aadhaar Masking API takes the document image and returns a redacted copy that is compliant to store.
Why should stored Aadhaar copies be masked?
UIDAI guidelines expect organisations that collect Aadhaar to keep the number out of stored copies, and a masked image is the accepted way to do that. Masking at upload time means an unmasked copy never reaches your storage in the first place.
How does face match work?
The Face Match API compares two facial images, such as a selfie and the photo on an ID document, and returns a similarity score. Pair it with the Face Liveness API, which checks that the selfie is a live person rather than a photo, video or mask.
What is document watermarking for?
A watermark stamps a document copy with text you choose, so a KYC document shared for one purpose cannot be passed off for another. It deters duplication, forgery and unauthorised reuse of the images you hold.
Which fraud and risk checks are available?
Risk Analyzer flags identity mismatches across a customer's data points and scores the application; I4C Check screens a mobile number against the cybercrime database; IP Quality Check detects proxies, VPNs and abusive addresses; the SEBI debarred-entity check and the MNRL disconnected-number check cover regulatory and telecom risk.
Is customer data retained after a call?
Processed data is discarded within 30 days, API access can be locked to your private network, and sensitive data is handled under ISO/IEC 27001 practices, as set out on the developer resources page.
How much does Aadhaar masking cost?
Pricing is per document or verification and depends on volume. Share your expected monthly volume and the team sends a rate card.
APIs
The APIs behind Security and compliance
Every check on this page is a catalogue API with its own page: request, response, use cases and FAQs.
API catalog
Every check we run, grouped two ways
By what the API verifies, or by who it is built for. The same APIs, reached from whichever direction you are starting.
Browse all APIs