Industrial Automation
Secure Document Verifier

Document Verifier

Instantly check whether an hjLabs.in tax invoice or PDF has been altered. It runs entirely inside your browser — your document is never uploaded, stored, or transmitted.

1 File checksum · MD5 / SHA‑256 2 Content fingerprint · field‑level
1 File checksum

The MD5 / SHA‑256 of the exact bytes. Compare it to the value hjLabs.in published (the document's .md5 sidecar). Change a single byte → a completely different hash.

2 Content fingerprint

For the HTML invoice, the MD5 of its data fields (parties, items, HSN/SAC, amounts) is recomputed here and matched to the code printed on the invoice. Any edit flips it to TAMPERED.

How to use this

  1. Get the file you received — the invoice PDF, or its HTML original — plus the checksum hjLabs.in gave you.
  2. Drop it above. Read the MD5 / SHA‑256, paste the expected value, hit Compare → match = byte‑identical to what was issued.
  3. For the HTML invoice you also get a green/red content verdict with every field decoded — so you can see the exact parties and amounts the seal was computed over.

A whole‑file self‑hash is mathematically impossible (adding the hash changes the file), which is why the checksum is published separately. Any public MD5/SHA‑256 tool yields the same file hash — this page just does it privately, in your browser.