Practical guides for comparing, reviewing and working with documents — written for people who deal with contracts, official documents and PDFs every day.
Understand what a SHA-256 hash is (the "fingerprint" of a file), how to calculate the hash of a PDF on Windows, Mac or directly in your browser, and how to use this technique to prove a document was never modified.
Read articleThe professional step-by-step for comparing PDF documents from start to finish — organizing the files, running the automatic comparison with difference highlighting, generating a report with SHA-256 hashes and preparing the final document for systems with size limits.
Read articleA complete guide to cryptography applied to documents, for non-technical readers — the difference between a SHA-256 hash, a digital signature and a trusted timestamp, what each mechanism proves, and the mistakes that silently invalidate a digital signature.
Read articleA practical guide to finding every change between two versions of a PDF contract — modified clauses, altered deadlines and added passages — right in your browser, without sending your files to the internet.
Read articleAn amendment to the tender, RFP or official notice just came out? Learn how to compare the original version with the amended one and find every change — deadlines, requirements and annexes — in minutes, without rereading the whole document.
Read articleMost online PDF tools send your documents to third-party servers. Understand the risks — professional secrecy, GDPR, confidentiality — and how 100% local processing in the browser works.
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