关于Adobe Acrobat DC自动修改PDF、只读模式设置及纯PDF查看软件推荐的技术问询

Hey there, let's walk through your questions step by step—this is a super common quirk with Adobe Acrobat DC, so you're not alone!

What changes are being made to my PDF? #

You didn't actually edit the blood analysis content, but Acrobat DC often makes tiny behind-the-scenes tweaks that it flags as "changes." These usually include:

• Metadata updates: Things like the last-opened timestamp, which pages you viewed, or your zoom level get saved to the file's metadata.
• Compatibility adjustments: If the PDF has minor rendering or font embedding issues, Acrobat might make subtle internal fixes to improve viewing, even without you interacting with the content.
• Temporary state saves: Sometimes the app saves session data (like scroll position) as part of the file, which triggers the save prompt.

Pro tip: These changes don't alter the actual blood analysis content—they're just the app's way of tracking your viewing session or optimizing the file for its own viewer.

How can I tell "Adobe Acrobat DC" to open my files in read-only? #

You've got a few solid options to lock things down:

• Global setting for all PDFs: Open Acrobat DC, press Ctrl+K to open Preferences. Go to the Documents tab, then check the box labeled "Open documents in read-only mode" under the Document Opening section. Click OK, and all future PDFs will open in read-only by default.
• Per-file quick open: Right-click any PDF in Windows Explorer, hover over Adobe Acrobat DC in the context menu, then select "Open as Read-Only". This is great for one-off cases.
• System-level read-only: Right-click the PDF, go to Properties > General tab, check the "Read-only" box at the bottom, then click Apply and OK. Acrobat will respect this Windows permission and won't let you save changes at all.

Opinionated: What software should I use if I want quality viewing and no editing features? #

If you're done with Acrobat's bloat and unnecessary save prompts, here are my top picks for Windows 10:

• Microsoft Edge: It's pre-installed, fast, handles large PDFs smoothly, and supports all basic viewing needs. It has annotation tools if you ever need them, but you can totally ignore them. Plus, it gets regular security updates automatically.
• Sumatra PDF: A lightweight, open-source viewer that's lightning-fast. It has a minimal, distraction-free interface and uses almost no system resources—perfect for just reading PDFs without extra frills.
• Foxit Reader (Free Version): If you want a bit more control than Edge but still don't need editing, the free Foxit Reader has clean viewing tools, supports form filling (though you said you don't need that), and is way lighter than Acrobat DC.

备注：内容来源于stack exchange，提问作者Notinlist