PDFThe PDFMax Blog
Guides, explainers and troubleshooting for everyday PDF work.
Most PDF problems are not really PDF problems — they are the result of a format that hides a lot of machinery behind a page that looks like paper. These articles open the hood: what actually makes a file huge, why an attachment bounces, and why a black rectangle over a name protects nobody.
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Why Is My PDF So Big? A Look Inside the File
A single scanned page can weigh more than a hundred pages of text. Here is what is really taking up the space in your document — and how much of it you can get back without ruining the quality.
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Email Attachment Size Limits — and What to Do When Your PDF Won't Fit
Your file is 24 MB, the limit is 25 MB, and the message still bounces. The reason is a 30-year-old encoding rule that quietly inflates every attachment by about a third.
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Black Boxes Are Not Redaction: How to Actually Remove Sensitive Text From a PDF
Draw a black rectangle over a name, save, send — and anyone can select the text underneath it. A practical workflow for removing information instead of merely covering it, plus a checklist to verify it worked.
Every tool referenced in these articles is free and needs no account. Start from the PDFMax home page or browse the full tool list.