PDFerret Blog
Guides and explainers on merging, compressing and converting PDF files safely.
How to merge PDF files (without uploading them)
A step-by-step guide to combining multiple PDF files into one document, locally in your browser, with no uploads and no limits.
2026-08-31
How PDF compression actually works (lossless vs. strong)
Why some PDFs shrink by 80% and others barely move: an honest explanation of lossless optimization and rasterization.
2026-08-31
The hidden privacy risk of online PDF tools
Every time you upload a document to a 'free' converter, a copy lands on someone else's server. Here is what actually happens, and how to avoid it.
2026-08-31
Where Does Your PDF Go? How PDFerret Differs from Typical Online PDF Tools
You want to merge two PDFs. You open an online tool, drop your file, click a button. Simple. But have you ever stopped to think about where that file goes in between?
2026-09-01
PDF previews crashed on iPhone: the Safari bug we just fixed
A white screen, a missing Promise API, and a worker that needed a shim. The engineering story of making local PDF previews work on every iPhone back to iOS 15.
2026-09-14
How to password-protect a PDF (and what it actually protects)
Add an open password to any PDF in your browser, and understand the difference between encryption, permissions and wishful thinking.
2026-09-14
How to OCR a scanned PDF so you can search and copy the text
Turn flat scans into searchable documents in your browser: what OCR does well, where it struggles, and how to get the best results.
2026-09-14
How to sign a PDF on your phone without printing anything
The full loop, from emailed contract to signed return, done on a phone in a few minutes — no printer, no scanner, no drive to an office.
2026-09-14
How to delete pages from a PDF (and keep the rest intact)
A step-by-step guide to removing unwanted pages from a PDF. Everything runs locally in your browser — no uploads, no re-compression, and your original file stays untouched.
2026-10-05
Watermarking a PDF: when to do it, how to keep it readable (and why it won't stop a leak)
The honest guide to PDF watermarks: when they make sense, the settings that don't wreck readability, and what a watermark can and cannot actually protect.
2026-10-12
PDF to Word: why the layout always breaks
Columns merge, fonts change, breaks land mid-sentence. It's not your converter being lazy — an honest engineering look at why PDF to Word conversion can never be perfect.
2026-10-19
Repairing a damaged PDF: what can be saved and what can't
A truncated download is usually fixable; a zeroed-out disk sector isn't. How PDF damage actually works, which cases repair tools can fix, and a five-minute triage routine.
2026-10-26