很多时候PDF文件的大小比预期的要大。由于不同的字体、过高的图像分辨率、彩色图像、压缩不良的图像等因素， PDF(PDF)文件大小会增加。由于这些因素，您在将它们上传到政府网站或将它们作为邮件附件发送时通常会遇到问题，因为大小限制。因此，您需要减小PDF文件的大小才能上传它们。现在，您可能在想：如何在不损失质量的情况下减小 pdf 文件的大小(how to reduce pdf file size without losing its quality)。是的，可以在不损失质量的情况下减小PDF文件的大小。(PDF)我们为您带来一份完美的指南，教您如何减少PDF文件大小而不损失质量。我们为Windows和Mac用户提供减小PDF文件大小的解决方案。所以，继续阅读！
如何在不损失质量的情况下减小 PDF 文件大小(How to Reduce PDF File Size Without Losing Quality)
无论您使用的是Windows还是Mac，都必须避免将文档扫描为 PDF(avoid scanning docs as PDF)，因为这会使您的文件变得不必要地大。这里提到的所有方法都非常简单，除非您选择付费版本，否则不需要任何付款。您可以根据自己的要求和便利性选择这些方法中的任何一种。
方法 1：在 MS Word 中减小 PDF 文件大小(Method 1: Reduce PDF File Size in MS Word)
当您有需要转换为PDF的(PDF)Word文档时，此方法是最佳选择。请按照以下步骤在Windows PC上的MS Word中减小(MS Word)PDF文件大小：
1.打开Word文档(Word document)，按F12键
2. 展开另存为类型(Save as type)下拉菜单。
3. 选择PDF选项并点击保存。(Save.)
注意：(Note:)此过程使PDF文件的大小比(comparatively smaller)使用第三方转换软件转换的文件要小。
4. 要将PDF文件大小减小到最小大小，请在优化选项中选择(Optimize for)最小大小（在线发布）(Minimum size (publishing online))。
5. 单击保存(Save)以减小 PDF 文件大小。
方法 2：在 Adobe Acrobat 中减小 PDF 文件大小 (Method 2: Reduce PDF File Size in Adobe Acrobat )
您还可以使用Adobe Acrobat Reader在不损失质量的情况下减小PDF文件大小，如下所示：
注意：(Note:)您不能在此方法中单独分析单个元素。
1.在Adobe Acrobat中打开PDF 文件。(PDF file)
2. 转到文件(File)>另存为其他(Save as Other)>缩小尺寸的(Reduced Size) PDF...，如突出显示的那样。
3.根据您的需要选择Acrobat 版本兼容性，然后单击(Acrobat Version Compatibility)确定。(OK.)
4. 接下来，单击保存(Save)将文件保存在所需位置，如下图所示。
5. 您将看到一个黑框，显示缩小 PDF 大小(Reducing PDF size)，如图所示。
完成所有步骤后，这将减小PDF 文件大小(PDF File Size)，而不会损失文件中内容和图像的任何质量。
另请阅读：(Also read:) 修复无法从 Adobe Reader 打印 PDF 文件(Fix Can’t Print PDF Files from Adobe Reader)
方法 3：使用 Adobe Acrobat PDF Optimizer(Method 3: Use Adobe Acrobat PDF Optimizer)
通过使用Adobe Acrobat PDF Optimizer，您可以通过自定义减小PDF文件的大小。Adobe Acrobat Pro DC允许您查看影响其大小的PDF文件的所有元素。(PDF)您还可以查看每个元素占用了多少空间，以便您可以根据自己的喜好自定义文件的大小。这样做的方法如下：
1.在Adobe Acrobat Pro DC中打开您的PDF 文件。(PDF file)
2. 进入文件(File)>另存为其他(Save as Other)>优化PDF(Optimized PDF) …，如下图。
3. 现在，单击下一屏幕右上角的审核空间使用...按钮。(Audit space usage…)
4. 在出现文件中占用空间的元素列表(list of elements consuming space)的弹出窗口中，单击“确定”。(OK.)
5. 选择左侧窗格中给出的元素(elements )以查看每个元素的详细信息，如图所示。
按照上述步骤，您将能够减小PDF文件的大小。(PDF)如果您没有Adobe Acrobat Pro DC软件，那么您可以使用任何第三方软件来减小Windows或Mac上的(Mac)PDF文件大小。按照(Follow)后面的方法做同样的事情。
方法四：使用第三方软件(Method 4: Use Third-Party Software)
有许多第三方软件可以减小PDF文件的大小。您可以使用其中任何一种来减小PDF文件大小而不会降低质量。如果您不确定要使用哪个软件，请使用4dots Free PDF Compress，如下所述：
1. 下载4dots Free PDF Compress并将其安装在您的 PC 上。
注意：(Note:) 4dots Free PDF Compress软件仅适用于Windows。如果您是Mac用户，那么您可以下载任何其他第三方软件。
2. 安装完成后，启动(launch)它并单击添加文件(Add file(s))，如下所示。
3. 选择您的PDF 文件(PDF file)并点击打开(Open)。
4. 您的文件将被添加，文件的所有详细信息将显示在表格中，即文件名、文件大小、文件日期和(Filename, File size, File date, and File location)设备上的文件位置。使用屏幕底部“压缩图像”(Compress Images)选项下方的滑块(slider)调整(Adjust)图像质量。
5. 单击屏幕顶部的压缩，然后单击(Compress)确定(OK)，如突出显示的那样。
6.可以看到压缩前后的PDF大小(PDF)对比。(Comparison)单击确定(OK)以完成该过程。
另请阅读：(Also Read: )在 Android 上编辑 PDF 的 4 个最佳应用(4 Best Apps to Edit PDF on Android)
方法五：使用在线工具(Method 5: Use Online Tools)
如果您不想下载任何软件或使用Adobe Acrobat，那么您可以简单地使用在线工具来减小PDF文件大小而不会损失质量。您只需要在互联网上搜索此类工具并上传您的文件。它将立即被压缩。此后，您可以下载它以供进一步使用。您可以在任何网络浏览器中搜索在线 PDF 压缩工具(online PDF compressing tools)，您会发现很多选项。Smallpdf和Best PDF是最受欢迎的。
注意：(Note:)我们在这里以Smallpdf为例。Smallpdf提供7 天免费试用(7-day free trial) ，如果您是第一次使用。您还可以使用付费版本获得更多选项和工具。
1. 进入Smallpdf 网页(Smallpdf webpage)。
2. 向下滚动查看最流行(Most Popular PDF tools )的 PDF 工具并选择压缩 PDF( Compress PDF)选项。
3. 点击选择文件(CHOOSE FILES)按钮，从您的设备中选择一个文件，如图所示。
注意：(Note:)或者，您可以将PDF 文件拖放到(drag and drop)红色框中。(red colored box.)
4. 如果您想稍微压缩文件，请选择Basic Compression，否则选择Strong Compression。
注意：(Note:)后者需要付费订阅(paid subscription)。
5. 做出选择后，您的文件将被压缩。单击(Click)下载 (Download )以下载压缩的PDF文件。
方法 6：在 Mac 上使用内置压缩器(Method 6: Use In-built Compressor on Mac)
如果您是Mac用户，那么您很幸运，因为Mac预装了一个内置的PDF压缩器以减小PDF文件的大小。使用预览应用程序(Preview App)，您可以减小PDF文件大小并用新文件替换原始文件。
注意：(Note:)确保在减小文件大小之前复制文件。(copy your file)
1.启动预览应用程序(Preview App)。
2. 单击文件(File)> Export To > PDF，如下图所示。
2. 根据需要重命名文件，然后单击保存(Save)将压缩文件保存在所需位置。
另请阅读：(Also read:) 无需打印和扫描即可对 PDF 文档进行电子签名(Electronically Sign PDF Documents Without Printing And Scanning Them)
专业提示：(Pro Tip:)当您想从不同的PDF制作合并的(PDFs)PDF文件时，您不需要打印输出然后扫描它们。不同的 PDF(Different PDF)文件也可以以电子方式合并为一个文件。您可以使用Adobe或在线提供的选项。与通过扫描文档的物理副本制作的PDF相比，以电子方式组合的(PDF)PDF将占用更少的空间。
常见问题 (FAQ)(Frequently Asked Questions (FAQs))
Q1。如何减小 PDF 的大小？(Q1. How do I reduce the size of a PDF?)
答。(Ans.)有很多选项可以减小PDF的大小，但最简单和最常用的是Adobe Acrobat Pro。由于大多数人使用Adobe Acrobat来阅读PDF(PDFs)，所以这种方法将是可行的。按照上述方法 2在(Method 2)Adobe Acrobat Pro中减小PDF文件大小。
Q2。如何减小 PDF 的大小以便可以通过电子邮件发送它？(Q2. How do I reduce the size of a PDF so that I can email it?)
答。(Ans.)如果您的PDF太大而无法邮寄，您可以使用Adobe Acrobat或在线工具(online tools)对其进行压缩。Smallpdf 、ilovepdf 等(Smallpdf)在线(Online)工具使用起来非常简单快捷。完成后，您只需要搜索在线PDF压缩工具，上传文件并下载即可。
Q3。如何免费减小 PDF 文件的大小？(Q3. How do I reduce the size of a PDF file for free?)
答。(Ans.)本文中提到的所有方法都是免费的。因此，您可以选择适用于 Windows PC 的Adobe Acrobat（方法 3）和适用于 MacBook 的内置 PDF 压缩器(inbuilt PDF compressor)（方法 6）。
受到推崇的：(Recommended:)
我们希望本指南对您有所帮助，并且您能够减小 pdf 文件的大小而不会降低 Windows 和 Mac 上的质量(reduce pdf file size without losing quality on both, Windows & Mac)。让我们知道哪种方法最适合您。如果您对本文仍有任何疑问，请随时在评论部分提出。
How to Reduce PDF File Size Without Losing Quality
A lot of times PDF files turn out to be larger in size than expected. РDF file size increases due to factors like differеnt fontѕ, excessive image resolution, colored images, poorly compressed images, etc. Due to these factors, you usually face iѕsues while uploading them on government websiteѕ or while sending thеm as attachments in the mail because of the size limit. So, you need to reduce PDF file size to υpload thеm. Now, уоu may be thinking: how to reduce pdf file size without losing its quality. Yes, it is possible to reduce PDF file size without losing quality. We bring to you a perfect guide that will teach you how to reduce PDF file size without losing quality. We have solutions for both Windows and Mac users to reduce PDF file size. So, continue reading!
How to Reduce PDF File Size Without Losing Quality
Whether you are using Windows or Mac, you must avoid scanning docs as PDF as it makes your file unnecessarily large. All the methods mentioned here are very easy and do not require any payment unless you opt for the paid versions. You can choose any of these methods according to your requirement & convenience.
Method 1: Reduce PDF File Size in MS Word
This method is the best option when you have a Word document that you need to convert to PDF. Follow the steps given below to reduce PDF file size in MS Word on Windows PC:
1. Open the Word document and press F12 key
2. Expand the Save as type dropdown menu.
3. Select PDF option and click on Save.
Note: This process makes the size of PDF files comparatively smaller than the file converted using third-party conversion software.
4. To reduce PDF file size to its minimum size, choose Minimum size (publishing online) in the Optimize for option.
5. Click Save to reduce your PDF file size.
Method 2: Reduce PDF File Size in Adobe Acrobat
You can also use Adobe Acrobat Reader to reduce PDF file size without losing quality, as follows:
Note: You cannot analyze individual elements separately in this method.
1. Open the PDF file in Adobe Acrobat.
2. Go to File > Save as Other > Reduced Size PDF…, as highlighted.
3. Choose Acrobat Version Compatibility as per your needs, and click OK.
4. Next, click on Save to save your file in the desired location, as illustrated below.
5. You will see a black box stating Reducing PDF size as shown.
Once all the steps are completed, this will reduce PDF File Size without losing any quality of the content and images within the file.
Also read: Fix Can’t Print PDF Files from Adobe Reader
Method 3: Use Adobe Acrobat PDF Optimizer
By using Adobe Acrobat PDF Optimizer, you can reduce PDF file size with customization. Adobe Acrobat Pro DC allows you to see all the elements of the PDF file which are affecting its size. You can also see view how much space is being consumed by each element so that you can customize the size of the file, according to your preferences. Here’s how to do so:
1. Open your PDF file in Adobe Acrobat Pro DC.
2. Go to File > Save as Other > Optimized PDF… , as shown below.
3. Now, click on Audit space usage… button on the top-right corner of the next screen.
4. in the pop-up that appears with the list of elements consuming space in the file, click on OK.
5. Choose elements given in the left pane to view details of each element, as illustrated.
You will be able to reduce PDF file size by following the above steps. If you do not have Adobe Acrobat Pro DC software then you can use any third party software to reduce PDF file size on Windows or Mac. Follow the succeeding methods to do the same.
Method 4: Use Third-Party Software
There are many third party software to reduce PDF file size. You can use any of these to reduce PDF file size without losing quality. If you are not sure which software to use, use 4dots Free PDF Compress, as explained below:
1. Download 4dots Free PDF Compress and install it on your PC.
Note: 4dots Free PDF Compress software is only available for Windows. If you are a Mac user then you can download any other third party software.
2. Once installation is complete, launch it and click on Add file(s) as shown below.
3. Select your PDF file and click on Open.
4. Your file will be added and all the details of the file will be shown in a table viz Filename, File size, File date, and File location on your device. Adjust image quality using the slider at the bottom of the screen, below the Compress Images option.
5. Click on Compress from the top of the screen and click OK, as highlighted.
6. Comparison of PDF size before and after compression will be visible. Click OK to finish the process.
Also Read: 4 Best Apps to Edit PDF on Android
Method 5: Use Online Tools
If you do not want to download any software or use Adobe Acrobat, then you can simply, use online tools to reduce PDF file size without losing quality. You just need to search the internet for such tools & upload your file. It will be compressed in no time. Thereafter, you can download it for further use. You can search for online PDF compressing tools in any web browser and you will find a lot of options. Smallpdf and Best PDF are the most popular ones.
Note: We have used Smallpdf as an example here. Smallpdf offers a 7-day free trial if you are a first-time user. You can also use the paid version for more options and tools.
1. Go to the Smallpdf webpage.
2. Scroll down to view Most Popular PDF tools and choose the Compress PDF option.
3. Select a file from your device by clicking on CHOOSE FILES button as shown.
Note: Alternatively, You can drag and drop the PDF file in the red colored box.
4. If you want to compress your file slightly, then choose Basic Compression, or else choose Strong Compression.
Note: The latter would require a paid subscription.
5. After you have made your choice, your file will be compressed. Click on Download to download the compressed PDF file.
Method 6: Use In-built Compressor on Mac
If you are a Mac user, you are lucky because Mac comes pre-installed with an inbuilt PDF compressor to reduce PDF file size. Using the Preview App, you can reduce PDF file size and replace the original file with the new one.
Note: Make sure to copy your file before reducing its size.
1. Launch Preview App.
2. Click on File > Export To > PDF, as illustrated below.
2. Rename the file as you wish and click Save to save the compressed file at the desired location.
Also read: Electronically Sign PDF Documents Without Printing And Scanning Them
Pro Tip: When you want to make a consolidated PDF file from different PDFs, you do not need to take a printout and then scan those. Different PDF files can be combined into one file electronically as well. You can either use Adobe or the options available online. PDF combined electronically will consume lesser space than the PDF made by scanning physical copies of documents.
Frequently Asked Questions (FAQs)
Q1. How do I reduce the size of a PDF?
Ans. There are a lot of options to reduce the size of PDF, but the easiest & most commonly used is Adobe Acrobat Pro. As most people use Adobe Acrobat to read PDFs, so this method will be feasible to use. Follow the above Method 2 to reduce PDF file size in Adobe Acrobat Pro.
Q2. How do I reduce the size of a PDF so that I can email it?
Ans. If your PDF is too large to mail, you can either use Adobe Acrobat or online tools to compress it. Online tools like Smallpdf, ilovepdf, etc are very easy and quick to use. You just need to search for online PDF compression tools, upload your file and download it, when done.
Q3. How do I reduce the size of a PDF file for free?
Ans. All the methods mentioned in this article are free. So, you can opt for Adobe Acrobat (method 3) for Windows PC and an inbuilt PDF compressor (method 6) for MacBook.
Recommended:
We hope that this guide was helpful and you were able to reduce pdf file size without losing quality on both, Windows & Mac. Let us know which method worked for you the best. If you still have any queries regarding this article, then feel free to ask them in the comments section.
