Masking is the least glamorous part of a document pipeline and the one that tends to be discovered late — usually when someone asks why a full Aadhaar number is sitting in a support ticket attachment. The requirement is narrow: keep the document useful, remove the identifiers.
Most document pipelines start the same way. A user picks a 14 MB scan, the browser uploads all 14 MB, a queue picks it up, a worker compresses it to 1.2 MB, and the original is deleted. You paid for the bandwidth, the queue, the worker and the storage — to end up with a file you could have had before the upload started. The alternative is to compress first and upload the result.
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