如今,许多PDF 文件(PDF files)不可搜索,因此很难在文档中找到特定文本。幸运的是,一些在线工具让您可以使用OCR(光学字符识别(Optical Character Recognition))技术和文本识别
来搜索PDF 。
这些工具是免费的,但功能有限,但比您只能使用一两次的昂贵PDF 软件(PDF software)更实惠。您可以简单地上传文件,按一两个按钮,然后下载可搜索的文档。
我的 PDF 可搜索吗?
查看您的PDF是否可搜索的最简单方法之一是查找您知道文档中存在的特定文本。根据您使用的PDF工具或平台,您可能有几种搜索文本的方法(ways to search for text)。
这里有些例子:
- (Adobe Acrobat Reader)Windows或Mac上的Adobe Acrobat Reader:从菜单中
Select Edit > Find
- Windows 上的 PDFelement:选择左侧的搜索(Search)图标。
- 在 Mac 上预览(Preview on Mac):从菜单栏中选择Edit > Find查找(Find)。
- 键盘(Keyboard)快捷键:在Windows上,按Ctrl + F,或在Mac上,按Command + F。
当搜索框打开时,输入您的文本并按Enter、Return或搜索按钮。如果您看到无法找到文本的消息,并且您知道它应该是,则您的PDF文档不可搜索。
确认无法搜索文档后,请查看这些在线文件转换器之一。您可以使用 OCR 技术(using OCR technology)快速轻松地制作可搜索的PDF文件。
您可以访问 PDF2Go工具直接创建可搜索的 PDF(tool for creating searchable PDFs) ,或从顶部的下拉菜单中
选择所有Tools > Make PDF Searchable
- 将文件拖放(Drag)到红色框中或使用其他选项选择文件、输入URL或从(URL)Dropbox或Google Drive上传。
- 文件上传后,您会看到它显示。选择开始(Choose Start)进行转换。
- 该过程完成后,您将看到一条成功(Success)消息。如果文件自动在新选项卡中打开,请转到那里。如果没有,请选择“下载(Download)”将其打开。
- 在新选项卡中,使用下载(Download)图标(或其他下载选项,具体取决于您的浏览器)将文件保存到您的计算机。
请注意,使用PDF2Go(PDF2Go)进行免费转换的大小限制为 100 MB 。
创建可搜索PDF的另一个不错的选择是Online2PDF。直接转到PDF 转换器(the PDF converter),或确保选择可搜索PDF作为转换器主页面上的输出(如下所示)。
- 将文件拖放(Drag)到灰色框中,或选择选择文件以从您的计算机上传文件。
- 文件上传后,它将显示在文件 1 旁边。确认在转换为框中选择了可搜索PDF ,然后选择(PDF)转换(Convert)。
- 该过程完成后,您将在浏览器的默认下载(Downloads)文件夹中看到该文件。如果您没有看到它,您可以使用手动(Manual)下载链接。打开包含文件的文件夹以访问它。
请注意,使用Online2PDF(Online2PDF)进行免费转换的大小限制为 100 MB 。
免费在线PDF(Free PDF Online)
使用Free PDF Online,您可以轻松制作可搜索的PDF。直接转到转换器(the converter)或选择OCR PDF从主页打开它。
- 选择选择文件(Pick Choose File)以浏览您计算机上的文件,并在需要时输入密码。当您看到 #1 旁边的文件名显示时,它已被上传。
- 或者,选择#2 旁边的转换语言,然后选择#3 旁边的开始(Start)来转换文件。
- 该过程完成后,选择“下载(Download)”,然后从浏览器的“下载(Downloads)”文件夹中获取文件。
请注意,使用Free PDF Online(Free PDF Online)进行免费转换的大小限制为 5 MB 。
三明治PDF(SandwichPDF)
最后一个免费检查工具是SandwichPDF,它专门创建可搜索的 PDF(creates PDFs)。
- 选择浏览(Select Browse)以上传您的文件或使用URL框输入其链接。
- (可选)选择一种源语言并选中该框以提高质量(如果您愿意)。选择开始(Select Start)。
- 该过程完成后,您将看到带有文件链接的结果。(Result)选择链接以在新选项卡中打开它,然后根据您的特定浏览器下载文档。
请注意,使用SandwichPDF(SandwichPDF)进行免费转换的大小限制为 10 MB 。
搜索您的 PDF
使用上述文件转换器之一后,使用您的(file converters)PDF阅读器打开文件,并使用本操作方法开头的说明搜索一些文本。您的阅读器现在应该可以识别文本,使其成为可搜索的PDF文档。
此外,您应该能够选择文本,以便可以将其复制并粘贴到其他地方。
有关相关文章,请查看适用于 Chrome 的 PDF 编辑器插件(PDF editor add-ons for Chrome)或最好的 PDF 编写器和打印机(best PDF writers and printers)。
How to Make a PDF Searchable
Many PDF files these days are not searchable, making it hard to find specific text in a document. Fortunately, several online tools let you make a PDF searchable with OCR (Optical Character Recognition) technology and text recognition.
These tools are free with limited features but are more affordable than costly PDF software you may only use once or twice. You can simply upload your file, press a button or two, and download the searchable document.
Is My PDF Searchable?
One of the easiest ways to see if your PDF is searchable is to look for particular text that you know exists in the document. Depending on the PDF tool or platform you’re using, you may have a few ways to search for text.
Here are some examples:
- Adobe Acrobat Reader on Windows or Mac: Select Edit > Find from the menu.
- PDFelement on Windows: Select the Search icon on the left.
- Preview on Mac: Select Edit > Find from the menu bar and choose Find.
- Keyboard shortcuts: On Windows, press Ctrl + F, or on Mac, press Command + F.
When the search box opens, type your text and press Enter, Return, or the search button. If you see a message that the text could not be found, and you know it should be, your PDF document is not searchable.
Once you confirm that you’re unable to search the document, check out one of these online file converters. You can quickly and easily make searchable PDF files using OCR technology.
You can visit the PDF2Go tool for creating searchable PDFs directly or select All Tools > Make PDF Searchable from the drop-down menu at the top.
- Drag and drop your file into the red box or use the other options to choose your file, enter the URL, or upload it from Dropbox or Google Drive.
- Once your file uploads, you’ll see it display. Choose Start to convert it.
- When the process completes, you’ll see a Success message. If the file automatically opens in a new tab, go there. If not, select Download to open it.
- In the new tab, use the Download icon (or other download option depending on your browser) to save the file to your computer.
Note that there is a 100 MB size limit for free conversions with PDF2Go.
Another good option for creating a searchable PDF is Online2PDF. Go directly to the PDF converter, or be sure to select Searchable PDF as the output on the main converter page (shown below).
- Drag and drop your file into the gray box or choose Select files to upload one from your computer.
- Once your file uploads, it will display next to File 1. Confirm that Searchable PDF is selected in the convert to box and pick Convert.
- When the process completes, you’ll see the file in your browser’s default Downloads folder. If you don’t see it, you can use the Manual download link. Open the folder containing the file to access it.
Note that there is a 100 MB size limit for free conversions with Online2PDF.
With Free PDF Online, you can make a searchable PDF easily. Go directly to the converter or select OCR PDF to open it from the main page.
- Pick Choose File to browse for the file on your computer and enter the password if required. When you see the file name display next to #1, it’s been uploaded.
- Optionally, pick a language for the conversion next to #2 and select Start next to #3 to convert the file.
- When the process completes, select Download and then obtain the file from your browser’s Downloads folder.
Note that there is a 5 MB size limit for free conversions with Free PDF Online.
One final free tool to check out is SandwichPDF which specifically creates PDFs that are searchable.
- Select Browse to upload your file or use the URL box to enter its link.
- Optionally, pick a source language and check the box to enhance the quality if you like. Select Start.
- When the process finishes, you’ll see the Result with a link to your file. Select the link to open it in a new tab and then download the document per your particular browser.
Note that there is a 10 MB size limit for free conversions with SandwichPDF.
Search Your PDF
After using one of the above file converters, open the file with your PDF reader and search for some text using the instructions at the beginning of this how-to. Your reader should now recognize text, making it a searchable PDF document.
In addition, you should be able to select the text so that you can copy and paste it elsewhere.
For related articles, look at PDF editor add-ons for Chrome or the best PDF writers and printers.