When flattening an annotation, the annotation is removed from the document, while its visual representation is kept intact. Flattening streamlines the document to basic PDF specifications, improving the usability of PDF files.Īnnotation flattening refers to the operation that changes annotations into a static area that is part of the PDF document, just like the other text and images in the document. An overused PDF file that will start to crash or show signs of corruption. It is normal that paper documents are gradually worn out over time. Flattening PDFs will make a printer read the transparent layers and hidden data clearly, therefore being able to print without any problems. In such a case, printers will only print the visible layer. PDF documents often contain transparent layers or hidden data that printers can’t detect. This allows users to spend less time sharing a file even if it is large-sized. Flattening can simplify the file and reduce its size, so the file can be rendered quickly and to be viewed and sent easily. The more information a document contains, the longer it takes to render and view it. The speed of opening a PDF file is related to the information it contains. So you’d better flatten your PDF files to add protection, preventing others from easily altering the information to commit fraud. It can be extremely dangerous if PDF forms that contain important information can be changed arbitrarily, especially when it comes to the government, financial industry, legal industry, etc. SecurityĪ flattened PDF file is more secure than a normal PDF file as it’s not so easy to change annotations and forms in the flattened PDF file. We already know the meaning of flattening, but why should we use this function? Hope you can find the answer here. The flatten feature is frequently used to lock in the content of annotations and forms to prevent anyone from changing the information after a user completes the content. Multiple layers like text, images, and page numbers are merged into a single layer. Annotations are converted to native texts to remove transparency effects. The interactions of the fillable forms are no longer fillable, such as push button, check box, radio button, text field, and more. There are some changes after flattening PDFs: ![]() ![]() Removes the transparency and all interactive elements, combines all of the document’s elements into a single layer, which is the process of flattening a PDF. The layers might include annotations, text, images, and fillable forms. So in this blog, we will introduce the flatten feature and help you make better use of it with our ComPDFKit.Ī PDF document consists of several layers, each of which can contain separate elements. However, it is difficult to tell what this function is used for from the name. You may notice the flatten feature when using a PDF processor.
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