Windows 10: Compress PDF files

Discus and support Compress PDF files in Windows 10 Support to solve the problem; Hello, Have lot of pdf files on my disk, I have read about software to compress these files. 1. Is there some program (free if possible) to do it ?... Discussion in 'Windows 10 Support' started by Motim, Feb 14, 2017.

  1. Motim Win User

    Compress PDF files

    Have lot of pdf files on my disk, I have read about software to compress these files.
    1. Is there some program (free if possible) to do it ?
    2. Is the compression effective (in percent), so to start installing the program ?
    3. After compression, are the files still readable ?
    Answers will be appreciated

    Motim, Feb 14, 2017

  2. Why are files printed with "Print to PDF" so huge?

    Hi Anthony,

    Sorry for the misunderstanding. I will be glad to answer your query.

    Please be informed that Adobe has a compression options to compress images in PDF documents it creates while Microsoft Print to PDF does not compress the files. This is the reason why the file size differs between the two.

    Hope this answers your query.

    If you have any Windows related queries, do let us know. We will be glad to help.
    Wungraileng Vashi, Feb 14, 2017
  3. windows 10 - how to scan docs as pdf


    You may scan a document as a PDF file if you have a program installed that allows you to create PDF's from the scanner. However, you may also

    zip or compress a file or a folder
    that you'd like to attach to an email to take up less storage space.

    Do let us know should you have further queries.
    Rachelle Gra, Feb 14, 2017
  4. tonez Win User

    Compress PDF files

    Its possible to compress pdf's I assumed PDF' files are designed to use the least amount of space possible there are lots of "FREE" services online most are average. personally i wouldn't use them, all tho i have used some to convert files
    tonez, Feb 14, 2017
  5. RolandJS Win User
    RolandJS, Feb 14, 2017
  6. Bree New Member
    Do you want to compress without loosing any quality, or would you accept a lower quality and/or resolution?

    Images in pdfs can be saved in a lossless form or use jpeg compression, for jpegs the level of compression can be increased at the cost of some loss of quality. The image resolution could also be reduced to save space. Any compression software would likely use these techniques to reduce the size of the file. Whether you notice the difference would depend on how heavily the compression was applied.

    For compression that leaves the original file untouched there are two options in Windows itself - ntfs file compression or 'send to a compressed (zipped) folder'. If you have Libre Office or similar you already have software that can open a pdf for editing and export it in a lower quality form.

    As an experiment I downloaded an illustrated manual in pdf form. The original file size was 17.2MB.

    ntfs compression:
    Right-click on file, select properties, click the 'Advanced...' button and tick 'compress contents to save disk space'.
    After compression File Explorer still shows the original file size, but its Properties shows 'size on disk: 16.4MB'. The data in the file is unaltered and the file can be opened as normal.

    Send to zipped folder:
    The zip folder produced was 14.7MB. Windows can open a zipped folder like any other folder so you can still easily read the pdf in its original form.

    Reduced resolution and increased compression with Libre Office:
    Opened in Libre Office Writer and exported to pdf, image resolution reduced from 300dpi to 150dpi, jpeg compression quality lowered to 33%. The exported pdf was 5.32MB. The loss of image quality was unnoticeable but some formatting changes were introduced, particularly in the alignment of the table of chapters. Such problems may be found in other pdf compression software, so beware.
  7. Motim Win User
    Thanks for the answer.
    I tried the "ntfs compression" technique, the pdf file was almost not changed in size, I will try to 'zip' all pdf files and see what I get.
    2. For the first time I got in my mail a private message from the forum, it was very strange for me. After solving the message, my answer to this is thanks for the message, but I say thanks-no.
    Motim, Feb 14, 2017
  8. Bree New Member

    Compress PDF files

    File Explorer will still show the original size of the file. To see how much it has shrunk, right-click on it and select 'Properties'. This shows two sizes, the important one is the 'Size on disk' which should now be smaller that the file size. How much smaller depends on how easy it is to compress that pdf, some will compress more than others.
  9. pparks1 Win User
    PDF's are usually in a compressed format to start with. I don't think most are going to compress well, if at all.
    pparks1, Feb 15, 2017
  10. Berton Win User
    Even though a compressed file into a .zip format will not show much shrinkage it is important to me as some forums or sites allow only certain formats and .zip is pretty much universal, useful to meet those requirements.
    Berton, Apr 4, 2018

Compress PDF files

  1. Compress PDF files - Similar Threads - Compress PDF files

  2. Copying Compressed Files

    in Windows 10 Backup and Restore
    Copying Compressed Files: Greetings, I already tried asking this in Microsoft Answers. I would like to use the compact command before copying files to an external drive. However, I've run into two problems: First, it seems that Windows automatically decompresses files before copying them, and tries...
  3. Copying Compressed Files

    in Windows 10 Network and Sharing
    Copying Compressed Files: Greetings, I would like to use the compact command on my laptop, and then copy the file to an external hard drive. However, the external drive doesn't support NTFS. Will this cause any problems? I'm using the external drive as a backup, so I wouldn't try to uncompress it...
  4. Cannot Compress Files

    in Windows 10 Network and Sharing
    Cannot Compress Files: Hi, I am not able to send a folder full of .oog audio files (297mb total) to be compressed by righting clicking & sending to compressed folder, I get the error "file not found or have no read permissions" I have another folder with audio files roughly the same size, I can...
  5. Compressed Files

    in Windows 10 Customization
    Compressed Files: Hello, I was wondering if there was any way to automatically compress all files on my pc without having to go and manually compress all of them. Please and thank you.
  6. Windows Compressing Files

    in Windows 10 Network and Sharing
    Windows Compressing Files: Whenever I download a file windows is automatically compressing it. I can't seem to find any settings to turn this off. I have plenty of room on my hard drive. Anyone know what's going on?...
  7. How to compress PDF file size?

    in Windows 10 Software and Apps
    How to compress PDF file size?: I have generated pdf's using rdlc and then combine multiple pdf files to single document using itextsharp pdfsmartcopy class. But my pdf size is large, i want to reduce the size of pdf. I have tried compression using itextsharp but that's unable to compress. When i upload the...
  8. Automatic file compression

    in Windows 10 Network and Sharing
    Automatic file compression: Today my laptop seems to have automatically compressed all the files and folders on my desktop. I've been able to decompress them with no problems but now every time I save a new file, windows compresses it. Does anyone know how to turn this automatic compression off? I have...
  9. Compressed files and notepad

    in Windows 10 Network and Sharing
    Compressed files and notepad: I'm attempted to download a file that was downloading as a notepad text. This file is supposed to be a compressed file with a program that runs after it's unzipped however I can't get the file to revert back to it's original state from the site....
  10. PDF Files

    in Windows 10 Support
    PDF Files: I have downloaded windows 10 and since then have been unable to amend or type in existing PDF files. Has anyone else experienced this problem. 38213