How to reduce the size of a PDF file

　　reducing the size of Adobe PDF files will improve their display, especially if they are accessed on the network without changing their appearance. Sometimes you can reduce the size of Adobe PDF files by simply using the Save As command. this saves the file again, but does not require access to the source files used to generate the Adobe PDF file.

If you receive a larger PDF document, you can use the reduce file size command to try to reduce the file size by resampling and decompressing the image, removing the embedded font, compressing the document structure, and organizing the elements, such as duplicate background images and invalid bookmarks. This command does not work if the file size is already small enough.

　　Note: reducing the number of digitally signed documents without destroying the validity of the signature reduces the file size of the digitally signed document, which invalidates the signature.

You can also reduce file size by restricting compatibility with older versions of Adobe Acrobat. This method is recommended if you can ensure that all users use Acrobat 7.0.

　　To reduce the file size:

1. Please select "file" > "Reduce File Size".

2. Please select the compatible version you want, and then click OK.

Note: If you select Acrobat 4.0 and newer versions, and the document contains transparency, transparency will be flattened.

PDF documents from some databases are often large in size, such as the APS download a EAM article http://prola.aps.org/abstract/PRB/v29/i12/p6443_1

Because the file is an image, not text content, so only 11 pages, size is up to 2.46M. Storage, transmission is not convenient. Here are some ways to reduce the size.

I'm using Acrobat3d v8.1, first to open the PDF, the main menu to select DOCUMENT-OCR text recoginition-recognize text using OCR

dialog box, select All Pages,primary OCR language:english,pdf Output style:searchable image,downsample:lowest (600dpi), and then OK

Acrobat to the document content OCR recognition, becomes the searchable text form, then may save first, saw the file to become 1.79MB, explained that the OCR recognizes besides the function, but also reduces the file size the effect.

Then Document-reduce File Size, due to the general use of more than 7.0 readers, so choose 7.0 and more. Look at the saved new file, reduced to 368KB. Selecting 8.0 and above does not make the file smaller.

If compressed into a RAR, can also be reduced to 336KB, but not much significance

Reduced from 2.46MB to 336KB, the results are obvious, and there is no loss of quality of the display, the text has also become searchable, copied form.

The order is critical if you reduce the File Size first, then OCR, and the result is 2.46mb->940kb->832kb

Acrobat also has a function, Document-optimize scanned PDF, can also reduce the size, but for this kind of text is very clean and clear PDF file, the effect is very small, and make the display quality drop.

Literature database those documents PDF, basically is the format neat, clear text specification, this kind of all can OCR, I have an article Slater 1931 years of articles, from 4MB to more processing to 700KB.

Only the text OCR recognition effect is not good, not as Violet, although the violet light is not how.

As for optimize scanned PDF, the size of the processing, see the slider to focus on quality or file size, at the same time can eliminate the low noise, correcting fonts, the literature on such databases is basically meaningless. To this kind of database literature, pull to the most biased size, probably can reduce about 15% size, but the text effect is also poor, not worth.

Literature database those documents PDF, basically is the format neat, clear text specification, this kind of all can OCR, I have an article Slater 1931 years of articles, from 4MB to more processing to 700KB.

Only the text OCR recognition effect is not good, not as Violet, although the violet light is not how.

As for optimize scanned ...

　　Discussion: How do I reduce the size of a PDF file?

Some of the output of the PDF file size exceeds our requirements, then we need to compress it, I tried a few ways:

1. Starting with Adobe Acrobat 7, the PDF Optimizer (Advanced tab) is available, which we can use to compress PDF files.

2, the use of PDF enhancer compression, adjustment.

3, your PDF file to use the PDF virtual printer printing, under normal circumstances can compress the PDF size to 30%-70%, depending on the composition of your PDF file.

PDF Virtual printer, I've tried Adobe Acrobat Pro with the Bullzip PDF printer,pdf Factory. Feel at this time with Bullzip PDF Printer best.

Sometimes the above method can be a maximum of 200M or so compressed 70M,