Redaction that's actually permanent
Removes the underlying text, not just a black box on top of it — a redacted page won't turn up in search.
About
A PDF editor built like software, not a viewer
ZPDF Pro edits text and images in place, redacts for real, fills and flattens forms, and signs documents with a signature that gets re-issued automatically whenever a signed file changes — a full editing pipeline, not a handful of tools bolted onto a viewer.
Who's behind it
Zeltosoft
Zeltosoft is a small team of three.
We're not a large company — we're a small, focused team building one product well rather than spreading across many products loosely. That's a deliberate choice: it's why ZPDF Pro's editing pipeline is built end-to-end rather than assembled from a viewer plus bolted-on plugins.
Why it exists
What makes it different
Three things we think actually matter in a PDF editor, and that most viewers-with-extra-tools get wrong.
Signatures that survive edits
A genuine PKCS#7 / CMS signature is re-issued automatically every time you edit a previously signed file — not a static stamp that goes stale.
Encrypted at rest, by design
Every file is stored as AES-256-GCM ciphertext, per account, decrypted only in memory after you sign in.
Questions about the product?
Get in touch — we read everything ourselves.