In daily work, if it is a PDF document transfer, it will take a little longer, but if you need to transfer dozens or hundreds of documents, it will take a lot of time, and for multiple PDF files to be compressed, the volume becomes smaller, and the transmission The efficiency will be greatly improved, saving time.

Common Methods of PDF Compression

This article takes "Thinking Records (Method) Pascal. 2014-Tianjin People, Original Size 298 M" as an example to test common methods on the Internet

online compression

Online compression is generally limited to 2 M ~ 200 M range.
At present, the N multi-PDF online compression tested, the limit point is 200M, and there are several places where there are no logins.

1. iLovePDF | An online PDF file processing tool for PDF lovers
https://www.ilovepdf.com/zh-cn

Test Results

Upload is fast, compression is fast, download is slow, and the sample file compression is only 1%.

2. PDF24 Tools: Free and easy-to-use online PDF tools
https://tools.pdf24.org/zh/

Test Results

The upload is fast, the compression is slower than the previous one, the download is slow, and the compression of the sample file is only 0.05%.

3. PDF compression_PDF online compression_Free PDF online compression tool-PDF88
https://pdf88.cn/compress_pdf/

Test Results

The upload is fast, the download is slow, and the compression of the sample file is only 0.17%.

Reader's own functions

Take Adobe Acrobat PDF Reader as an example of its four built-in functions

1. [Reduced Size PDF®]

After opening the file, select [File] –> [Save As Other] –> [Reduced Size PDF®] to shrink the PDF. The compression function will vary according to the version compatibility of the software, and the size of the adaptive compression will also be different.

2. 【Optimized PDF(O)】

After opening the file, select [File] - [Save As Other] - [Optimized PDF] to open the file optimization interface.
You can choose the image quality and file content by yourself to reduce the size of PDF files.

3. [Adobe Virtual Printing]

After opening the file, press Ctrl+P–>[Print Settings], select the Adobe PDF printer, –>[Properties]–>[Adobe PDF Settings], replace [Default Settings] with [Minimum File Size], and click “OK” to print and compress PDF document size.

Comparing the results of the above three tests

is of little use.
4. 【Save as】

This type is only applicable to files whose original files are non-scanned, and most of the texts are converted into PDF files. Many files will be much smaller if they are saved directly.

Note:

The sample files are scanned files, and Article 4 does not apply to scanned files. There are no ready-made sample files here.

Foxit PhantomPDF Suite also has similar functions, so I won’t repeat them here.

professional compression tool

PDFShrink

Test Results

Size comparison: 45% compression for the sample file .

Definition comparison (upper is the original file, lower is after compression)

PDFCompressor

Test Results

Size comparison: 64% compression for the sample file .

Definition comparison (upper is the original file, lower is after compression)

hint

The sample file in this article may not be built by the same PDF software as other blog post files. The latter two software are the software I often use to compress PDF, and they are for readers' reference only.

Small program in the text

PDFShrink
PDFCompressor

Link: https://pan.baidu.com/s/1XsOU0wqqZ28F2l7euVQpmA?pwd=viqm

PDF Sharpness Adjustment —— PDF "Severe Weight Loss"

Instead of using a professional compression tool, introduce another method of processing the sample file, and "slim down" the original size of 298 M to 13.2 MB.

This article belongs to the original author, please indicate the source for reprinting.

Comparison of Common Methods of PDF Compression