Guides

Turning Photos or Scans into a Single PDF for a Submission

Getting a phone-photographed document accepted by a portal that wants one PDF

PNG or JPEG? Choosing a Format and DPI When Exporting PDF Pages

Which format suits text, which suits photos, and what DPI actually buys you

Merging PDFs: Getting the Page Order Right the First Time

Filename sorting traps, mixed page sizes, and what merging does to bookmarks

PDF Page Sizes Explained: A4, Letter, and Why Your Pages Come Out Wrong

Points, DPI and paper sizes — why a converted PDF prints at the wrong scale

How to Fix a Sideways or Upside-Down Scanned PDF

Why rotation sometimes doesn't stick, and how to make it permanent

Password-Protected PDFs: What Browser Tools Can and Can't Do

The two kinds of PDF password, and why an encrypted file won't open in most tools

Why Hiding Text in a PDF Usually Doesn't Remove It

Black boxes and highlighter tools don't delete anything — what actually redacts a document

How to Reorder and Delete PDF Pages Without Uploading Them

Restructure a PDF — reorder, remove, duplicate, and splice in pages — without sending it to a server

Why Your PDF Is So Large — And What Actually Makes It Smaller

What takes up space inside a PDF, and which size-reduction methods genuinely work

Scanned vs Text-Based PDFs: How to Tell, and Why It Changes Everything

A five-second test, and why the answer determines what every PDF tool can do

How to Split a PDF Without Uploading It

Extract pages from a PDF without sending the file to a server

Why Client-Side PDF Tools Are Safer for Sensitive Documents

What actually happens to your file when a tool asks you to upload it

Client-Side vs Upload-Based PDF Tools

The real tradeoffs between browser-based and server-based PDF tools

Hidden Metadata in PDFs: What Your File Reveals About You

Author names, software, timestamps and edit history travel with the file