Can someone remove the black mask box after I download the file?

No. Aadhaar Masker renders the page and the black mask onto a single flat bitmap canvas before generating the output file. The original pixels and text strings underneath the mask are permanently overwritten in memory.

What is the default password to open a downloaded e-Aadhaar PDF?

UIDAI encrypts downloaded e-Aadhaar PDFs with an 8-character password consisting of the first 4 letters of your name in CAPITAL letters followed by your 4-digit year of birth (for example, AARA1994).

Should I also mask the QR code on the back of the Aadhaar card?

If you are submitting the copy to an untrusted third party such as a hotel desk, masking or omitting the high-density QR code is good practice because the signed QR payload contains demographic fields.

Is my Aadhaar card uploaded anywhere during masking?

Never. All rendering and pixel masking run inside your browser tab using the HTML5 Canvas API and local JavaScript.

How to Mask the First 8 Digits of Aadhaar Locally

Why UIDAI recommends masking the first 8 Aadhaar digits

Every file format and statutory compliance rule has a deterministic structure underneath the user interface. When teams rely on manual spreadsheet edits or generic cloud converters, subtle structural details get lost: page coordinate boxes reset, check digits go unverified, or rounding rules drift by several hundred rupees across a financial year. Understanding the exact specification behind Aadhaar Masker lets you verify every output before it enters an audit file or government portal.

The reference table below summarizes the core technical and statutory parameters enforced by the local engine:

Parameter / Rule	Specification / Formula	Practical Audit Impact
Mask Pattern	`First 8 digits masked (XXXX XXXX 1234), last 4 visible`	Matches UIDAI Masked Aadhaar visual format
Destruction Method	`Canvas pixel overwrite + raster flattening`	Underlying text stream and original pixels are discarded
Both Appearances	`Top letter portion + bottom cut-out card portion`	Ensures the 12-digit number is not left exposed on the upper half
Network Exposure	`100% client-side execution in browser RAM`	Your unmasked Aadhaar never touches an external server

Because each rule above is evaluated directly in your browser tab using typed JavaScript arrays and WebAssembly workers, there is no server queue, no file-count cap, and zero external data retention. Every byte of the source document or ledger table is parsed inside volatile browser memory and released as soon as the tab closes.

How pixel-level canvas destruction prevents copy-paste leaks

Running this workflow in Local Aadhaar Masker takes four deterministic steps from raw input to verified output:

Open Local Aadhaar Masker and select your Aadhaar PDF or JPG/PNG scan (open it first if it has an 8-character e-Aadhaar password).
Position the opaque masking boxes over the first 8 digits (two groups of 4 digits) on both the main card and the upper tear-off stub if present.
Optionally mask the VID (16-digit Virtual ID) or QR code if your verifier only needs visual last-4-digit confirmation.
Export the flattened PDF or PNG and test by attempting to highlight or copy text over the masked area.

Note: All inputs, uploaded files, and intermediate calculations remain in volatile browser RAM. Closing or refreshing the tab clears the memory buffer immediately.

When you process recurring monthly batches, keeping the input schema consistent across runs ensures that downstream checks in related guides such as permanently redact sensitive text in pdf files, strip xmp and author metadata from pdf files, remove exif metadata gps photos online match to the exact rupee or byte. Before starting a large batch, verify that your source file is not locked by an unknown password and that column headers or page indices match the expected range.

Step-by-step: masking an e-Aadhaar PDF or scan in ShiftTools

Masking Both Number Locations on a Full-Page e-Aadhaar Letter

A downloaded full-page e-Aadhaar PDF displays the 12-digit number in two separate places: once near the middle enrollment summary and once at the bottom front card panel, plus a high-density QR code. In Aadhaar Masker, placing solid black redaction blocks over the first 8 digits ("5482 9103") in both locations while leaving the trailing "4829" untouched, and flattening the page into a single raster layer, produces a 410 KB KYC document where zero underlying text glyphs survive.

TEXT

Original String on Card:  5482  9103  4829
Masked Output (Flat Pixel): ■■■■  ■■■■  4829
Underlying Text Stream:     [NONE, Flattened Raster Image]

You can reproduce this exact calculation at any time by pasting the sample values above into Aadhaar Masker and comparing the generated summary row against your internal workpaper. Recording the input parameters alongside the output file creates a self-contained audit trail for statutory or peer review.

Worked example: preparing a compliant KYC copy for hotel or HR onboarding

In production accounting and document engineering workflows, edge cases appear when inputs combine multiple conventions in a single batch. For example, a merged PDF bundle may mix portrait A4 text pages (/MediaBox 595.28 × 841.89 pt) with wide environment annexures, or a quarterly ledger export may combine April-to-September transactions with October-to-March entries after a mid-year threshold revision.

To prevent silent errors across those boundaries, always inspect the per-item diagnostic status before exporting the final file:

Verify unit consistency: Confirm whether input figures represent monthly vs annual amounts, GST-exclusive vs GST-inclusive values, or 1-based physical page indices vs printed document numbers.
Check boundary conditions: Pay close attention to exact threshold cutoffs, leap-year day counts, and page rotation multiples (0, 90, 180, 270 degrees) where off-by-one errors commonly occur in manual spreadsheets.
Preserve audit trails: Save the exported summary CSV or processed PDF alongside the raw source file so any reviewer can trace the transformation step by step without re-keying data.
Cross-check neighbour utilities: Pair Aadhaar Masker with companion tools in the PDF Suite suite (permanently redact sensitive text in pdf files, strip xmp and author metadata from pdf files, remove exif metadata gps photos online) when a task spans multiple stages.

When organizations still require full e-Aadhaar XML or OTP verification

A visually masked Aadhaar is intended for offline photo-ID proof (hotels, travel, private employers, landlords). Regulated entities performing statutory e-KYC under the PMLA (such as banks opening a new savings account or SEBI brokers) may require an official UIDAI-signed Masked e-Aadhaar, DigiLocker share, or OTP verification rather than a user-masked scan.

Limit: Client-side browser execution verifies mathematical formulas, statutory rules, and binary file structures offline. Where a regulation requires live portal authentication (such as checking active GST registration status on the GSTN portal or verifying operative PAN-Aadhaar linkage on TRACES), perform that portal check alongside your local calculation.

By separating deterministic local computation from external portal lookups, your team eliminates manual formatting and calculation errors while keeping sensitive client files off third-party cloud servers.