PDF guides
Merging, splitting, compressing, protecting and signing PDF documents.
6 guides
How to Merge PDF Files Without Uploading Them
Combine several PDFs into one document: how merging works, how to control page order and orientation, what breaks bookmarks and forms, and how to do it without uploading files.
How to Compress a PDF Without Wrecking the Quality
Understand what actually makes a PDF large, which compression settings matter, how much size you can realistically save, and how to compress a PDF privately in your browser.
Compress PDF Without Losing Quality
Honest guide to shrinking a PDF without wrecking it: Lossless (small safe savings), Compress images (re-encode photos, keep text selectable), and Rasterize (biggest savings, flattens pages). Pick the mode that matches your file.
Why Won't My PDF Unlock? (Password Types Explained)
Why a PDF opens in a viewer but still fails merge or unlock: Password to open vs Owner / permissions lock vs None. What Unlock PDF can remove (RC4, AES-128, AES-256) — and what it cannot (lost passwords, certificate encryption, rare /V3).
Merge Password-Protected PDFs Online
Mergers cannot read encrypted page streams. Unlock each PDF first (user password vs owner/permissions lock), then combine the unlocked copies. Locked files are skipped with a named error, not a silent batch failure.
Protect PDF: User Password vs Owner Password (What Permissions Actually Mean)
User (open) password vs owner (permissions) password in PDFs: what Protect PDF sets with AES encryption, how permission toggles map to allowed actions, and why owner locks are etiquette — not real secrecy.
All PDF guides
6 published
How to Merge PDF Files Without Uploading Them
Combine several PDFs into one document: how merging works, how to control page order and orientation, what breaks bookmarks and forms, and how to do it without uploading files.
How to Compress a PDF Without Wrecking the Quality
Understand what actually makes a PDF large, which compression settings matter, how much size you can realistically save, and how to compress a PDF privately in your browser.
Compress PDF Without Losing Quality
Honest guide to shrinking a PDF without wrecking it: Lossless (small safe savings), Compress images (re-encode photos, keep text selectable), and Rasterize (biggest savings, flattens pages). Pick the mode that matches your file.
Why Won't My PDF Unlock? (Password Types Explained)
Why a PDF opens in a viewer but still fails merge or unlock: Password to open vs Owner / permissions lock vs None. What Unlock PDF can remove (RC4, AES-128, AES-256) — and what it cannot (lost passwords, certificate encryption, rare /V3).
Merge Password-Protected PDFs Online
Mergers cannot read encrypted page streams. Unlock each PDF first (user password vs owner/permissions lock), then combine the unlocked copies. Locked files are skipped with a named error, not a silent batch failure.
Protect PDF: User Password vs Owner Password (What Permissions Actually Mean)
User (open) password vs owner (permissions) password in PDFs: what Protect PDF sets with AES encryption, how permission toggles map to allowed actions, and why owner locks are etiquette — not real secrecy.