Facebook groups allow group members to post documents such as PDF and DOCX files, but there is no option for you to upload a document in a regular post in a Facebook profile. As a workaround, convert the PDF file to an image using the file conversion tool in apps such as Adobe Acrobat or GIMP and post the file as an photo.
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Upload a PDF File to a Facebook Group
Step 1: Log into your Facebook account and locate the Groups section on the left sidebar. Choose one of your groups. In this example, the group is called "Share your wisdom."
Step 2: Click the Add File tab in the post editing section.
Step 3: Click the Choose File button to upload a PDF file from your computer.
Step 4: Navigate to the PDF file you want to upload to your Facebook group and click Open.
Step 5: Note that the PDF file appears in the post editing box and click Post to publish your post.
Convert a PDF File to an Image to Upload to Facebook with GIMP
Step 1: Open the PDF file you want to upload to your Facebook account in GIMP. Click Export As in the File menu.
Step 2: Choose an image file type, such as PNG, and name the file. Click Export.
Step 3: Leave the default selections in the Export Image as PNG window and click Export. The image can now be posted as an attachment in any Facebook post.
Convert a PDF File to an Image to Upload to Facebook with Adobe Acrobat
Step 1: Open the PDF file you want to upload to your Facebook account in Adobe Acrobat. Choose Save As from the File menu.
Step 2: Choose an image type in the Save as Type box, such as JPEG or PNG, and click Save to convert the PDF file to an image.
Step 3: Post the image to Facebook as an attachment in any post.
Convert a PDF to an Image to Upload to Facebook with PDF2JPG.net
Step 1: Open a Web browser and go to PDF2jpg.net.
Step 2: Choose the quality for the JPG from the drop-down menu and click Choose a PDF file.
Step 3: Choose the PDF file to upload and click Open.
Step 4: Click Convert PDF to JPG.
Step 5: Click Download to download the JPG file or files. There is one JPG file for each page of the PDF that you converted.
Step 6: Select Save File and click OK. The image can now be posted as an attachment in any Facebook post.