What browser-local file processing actually means
Understand which file operations can stay inside the browser, what still uses the network, and how to verify a privacy-first file workflow.
ZAMAZY
File knowledge: PDFs, images, privacy and verification
Technical explanations about PDF structure, secure redaction, compression, metadata, browser-local processing and output verification.
These pages explain technical properties behind ZAMAZY tools. Each article covers a distinct technical question and links to relevant focused tools.
Secure PDF redaction versus drawing a black box
Learn why visual concealment is not the same as removing information, what a secure redaction workflow must verify, and what is lost when pages are rebuilt.
Why a valid PDF can still be unsupported by a file tool
A PDF can open correctly and still contain structures that a bounded browser tool cannot safely preserve, transform or verify.
PDF compression: lossless structure versus lossy image reduction
Understand why some PDFs shrink dramatically while others barely change, and why an exact target size usually requires quality tradeoffs.
How PDF merging can preserve page quality and geometry
Learn the difference between combining PDF page objects and rasterizing pages, including page boxes, rotation, mixed page sizes and verification.
JPEG, PNG and WebP compression are not the same problem
Compare lossy JPEG recompression, lossless PNG repacking and WebP re-encoding, including transparency, metadata and verification.
File metadata, privacy and what transformations really preserve
Understand document metadata, image EXIF and GPS data, why re-encoding can remove metadata, and why privacy claims must distinguish file contents from telemetry.
Why file tools should verify their own output
A successful function call does not prove that a generated PDF or image is correct. Learn how independent verification catches structural, visual and format errors.
PDF digital signatures, encryption and why file tools treat them differently
Understand why rewriting a signed PDF can invalidate trust and why encrypted PDFs require explicit decryption support instead of guesswork.
Why file uploads fail: format, size, structure and portal rules
A file can look correct and still fail an upload because portals validate technical properties beyond the filename extension.