Are you using Acrobat/Reader XI? See Display PDF in browser | Acrobat XI, Reader XI.
You can open PDFs on a web page either within your web browser, or in Acrobat or Reader. Find instructions specific to each browser below.
Each browser has its own settings to control how PDFs open from a web page. Acrobat DC and Acrobat Reader DC do not include a preference setting to open web-based PDFs. To change the display behavior, follow the instructions below for your browser, or see the browser documentation on how to control plug-ins or add-ons.
Internet Explorer 8 and later
Click the Enable or Disable button (it toggles depending on the status of the selected add-on):
Enable sets the Adobe PDF Reader add-on to open PDFs in the browser.
Disable turns off the add-on so it does not open PDFs in the browser.Select Adobe PDF Reader, and click the Enable/Disable button.
For more information, see the Internet Explorer help topic: Manage add-ons in Internet Explorer - http://windows.microsoft.com/en-IN/internet-explorer/manage-add-ons#ie=ie-11
Microsoft Windows 10 will ship with two browsers - Internet Explorer 11 and the new Edge browser.
The Edge browser will be the default browser and Internet Explorer 11 will be available to support legacy workflows. The new Edge browser will not have any support for ActiveX plug-ins. Therefore, Acrobat/Reader plug-in won't work with Edge. For more information, see Change in support for Acrobat and Reader plug-ins in modern web browsers.
Use Internet Explorer 11 to open PDFs. To enable the Acrobat/Reader plug-in in Internet Explorer, see the steps in the previous section.
Choose an appropriate option in the drop-down list next to the name of the plug-in.
Always Activate sets plug-in to open PDFs in the browser.
Ask to Activate prompts you to turn on the plug-in while opening PDFs in the browser.
Never Activate turns off the plug-in so it does not open PDFs in the browser.Select the Acrobat or Reader plugin in the Add-ons Manager.
For more information, see the Mozilla Firefox help topic Using a PDF Reader Plug-in.
Chrome and Acrobat are no longer compatible. Acrobat/Reader plug-in for Google Chrome is based on the Netscape Plug-In API (NPAPI) technology. Google announced that in April 2015 NPAPI plug-in support will be disabled by default in the Google Chrome web browser with an override capability for advanced users. In September 2015, NPAPI support in the Google Chrome web browser will be removed entirely.
For more information, see Change in support for Acrobat and Reader plug-ins in modern web browsers.
To view PDFs with Safari, you can do one of the following:
- Set Safari preferences to use Adobe Reader plug-in
- Disable AdobePDFViewer plug-in to use the default Safari PDF viewer
You must have root user privileges to change Safari plug-ins. To display PDFs using the Safari PDF viewer, you must disable the Adobe PDF Viewer.
Log in as the root user. The root user privileges aren't enabled by default because the root user can change system files. For more information and instructions, see one of the following Apple documents: Enabling and using the "root" user in Mac OS X or OS X Mountain Lion: Enable and disable the root user.
Open the Internet Plug-ins folder, and move both the AdobePDFViewer.plugin and the AdobePDFViewerNPAPI.plugin into the new Internet Plug-ins Disabled folder.
If both AdobePDFViewer plug-ins are still in the Internet Plug-ins folder, drag them now to the trash. You may be asked for your name and password.