{"id":2683,"date":"2016-03-22T15:44:53","date_gmt":"2016-03-22T22:44:53","guid":{"rendered":"https:\/\/www.autodesk.com/blogs\/autocad\/?p=2683"},"modified":"2020-04-07T14:51:24","modified_gmt":"2020-04-07T21:51:24","slug":"pdf-import-guidance-working-with-pdf-and-autocad-dwg-data","status":"publish","type":"post","link":"https:\/\/www.autodesk.com/blogs\/autocad\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\/","title":{"rendered":"AutoCAD PDF Import: Guidance for Working with PDF and AutoCAD DWG Data"},"content":{"rendered":"<p><i>This article was updated on\u00a0<span class=\"m_5799246948768235664m8504860066908434141m-5233524698325788272gmail-aqj\">October 26, 2018<\/span>\u00a0to reflect the recent enhancements and bug fixes made to this feature.<\/i><\/p>\n<p>AutoCAD-based products can import data directly from PDF files into your drawing files, but are there any practical limitations to know about?<\/p>\n<p>The answer depends on your intended use.<\/p>\n<p>For example, if you\u2019re simply importing catalog items, a schedule, or a landscape plan for visual reference, the answer is No, there are no practical limitations. You can stop reading right here. Enjoy the rest of your day.<\/p>\n<p>On the other hand, if you require higher precision, plan to use object snaps\u00a0and\u00a0offsets, and will be\u00a0duplicating objects imported from PDFs, you need to understand the limitations intrinsic to the imported data.<\/p>\n<p>Let\u2019s compare the differences in the data stored in a PDF with the data stored in a\u00a0<a href=\"http:\/\/www.autodesk.com\/products\/dwg\" target=\"_blank\" rel=\"noopener noreferrer\">DWG&#x2122;<\/a>\u00a0file, and see how that affects your results.<\/p>\n<div id=\"attachment_2689\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/res.cloudinary.com\/dnngwl1yi\/image\/upload\/v1572908985\/autocad-2017-pdf-import-floor-plan_pbvw40.png\" rel=\"attachment wp-att-2689\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2689\" class=\"size-medium wp-image-2689\" src=\"https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-floor-plan_pbvw40-300x291.png\" alt=\"Floor plan in AutoCAD 2017 imported from a PDF.\" width=\"300\" height=\"291\" srcset=\"https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-floor-plan_pbvw40-300x291.png 300w, https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-floor-plan_pbvw40.png 458w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2689\" class=\"wp-caption-text\">Floor plan imported from a PDF<\/p><\/div>\n<h2 id=\"comparing-pdf-and-dwg-formats\">Comparing PDF and DWG Formats<\/h2>\n<p>There\u2019s a profound difference between PDF and DWG files in data content, format, and structure.<\/p>\n<p>The data in PDF format supports the following:<\/p>\n<ul>\n<li>Real numbers that are usually represented with single-precision floating-point accuracy in recent versions<\/li>\n<li>Five graphical object types: path (line segments and B\u00e9zier curves), shading, TrueType&#x2122; text, inline image, and external<\/li>\n<li>Several properties that include primarily colors, layers, and line widths<\/li>\n<\/ul>\n<p>In contrast, the data in AutoCAD DWG format supports a far richer data set including the following:<\/p>\n<ul>\n<li>Real numbers that are represented with double-precision floating-point accuracy, which is several orders of magnitude more precise than single precision<\/li>\n<li>More than 60 types of geometric objects, including compound objects such as dimensions, hatches, and blocks<\/li>\n<li>More than 50 types of properties<\/li>\n<li>Object associativity such as is available with hatches, blocks, and dimensions<\/li>\n<\/ul>\n<p>Due to the difference in precision between PDF and DWG formats, the values for coordinates, angles, distances, and widths are rounded off in PDF format. As a result, objects will be modified slightly when you output geometric data to a PDF file. These differences are most noticeable when working with large distances and dynamic ranges, as is common with large maps.<\/p>\n<p><strong>Note:<\/strong> The accuracy that\u2019s lost is difficult to restore without employing inferences. More about inferences later.<\/p>\n<p>Behavioral losses when converting a drawing to PDF include the following:<\/p>\n<ul>\n<li>Block references become geometric objects as if exploded<\/li>\n<li>By default, non-continuous linetypes become separate collinear objects<\/li>\n<li>Hatch patterns become many individual objects without associativity<\/li>\n<li>Dimensions become individual lines, 2d solids, and mtext objects<\/li>\n<li>TrueType text will maintain its fidelity when the same fonts are available on your computer<\/li>\n<li>PDF files generated from AutoCAD drawings store SHX-font text as geometric objects<\/li>\n<\/ul>\n<h2 id=\"truetype-fonts\">TrueType Fonts<\/h2>\n<p>PDF automatically includes Courier-, Helvetica-, Times-, Symbol, and ZapfDingbats fonts. It will also use any TrueType fonts available on your computer, or it will use a substitute font with similar parameters.<\/p>\n<h2 id=\"converting-data-to-and-from-pdf\">Converting Data To and From PDF<\/h2>\n<p>To convert data to and from PDF requires <em>direct translators<\/em> that interpret and try to reconcile the data. These direct translators are included in each AutoCAD product and are usually called \u201cdrivers\u201d depending on the context.<\/p>\n<p><strong>Note:<\/strong> PDF drivers, which are the responsibility of each company that uses them, can vary in capability and quality. These differences will affect PDF import or export operations between products. For example, dpi (dots-per-inch) output resolution can be set to different values in some products. In AutoCAD, you can specify a maximum of 4800 dpi.<\/p>\n<div id=\"attachment_2692\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/res.cloudinary.com\/dnngwl1yi\/image\/upload\/v1572908984\/autocad-2017-pdf-import-vector-output_m9lhwh.png\" rel=\"attachment wp-att-2692\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2692\" class=\"size-medium wp-image-2692\" src=\"https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-vector-output_m9lhwh-300x184.png\" alt=\"Dialog box for changing the vector output quality. PDF Import in AutoCAD 2017.\" width=\"300\" height=\"184\" srcset=\"https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-vector-output_m9lhwh-300x184.png 300w, https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-vector-output_m9lhwh-768x470.png 768w, https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-vector-output_m9lhwh.png 921w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2692\" class=\"wp-caption-text\">Changing the vector output quality<\/p><\/div>\n<p>Using a lower output resolution decreases the PDF file size but increases the round-off errors.<\/p>\n<h2 id=\"understanding-the-role-of-inference\">Understanding the Role of Inference<\/h2>\n<p>After the PDF data is imported, the biggest challenge is <em>inference<\/em>. This is a process by which AutoCAD starts with the equivalent of exploded data (what we affectionately call \u201cgrass clippings\u201d) and makes some best guesses to reconstruct more precise locations, object types, and associations.<\/p>\n<p>For example, AutoCAD must deal with questions such as the following:<\/p>\n<ul>\n<li>Is this line supposed to be exactly horizontal?<\/li>\n<li>Should the length of this line be rounded to exactly 10.00000000?<\/li>\n<li>Should these two endpoints be made coincident?<\/li>\n<li>Should these four arc-shaped objects be combined into a circle, or are they closer to an ellipse or a closed spline?<\/li>\n<li>Are these objects part of a block?<\/li>\n<li>Are these objects part of a hatch object?<\/li>\n<li>Are these collinear line segments part of a non-continuous linetype?<\/li>\n<li>Is this geometry and text supposed to be an associative dimension object?<\/li>\n<li>Is this geometry a text object that was created with an SHX font?<\/li>\n<li>And so on . . .<\/li>\n<\/ul>\n<p>Currently, AutoCAD supports the following inferences:<\/p>\n<ul>\n<li>Circles are inferred from objects that closely approximate a circle<\/li>\n<li>Ellipses are inferred if the elliptical geometry was represented in the PDF as a sequence of lines rather than B\u00e9zier curves<\/li>\n<li>B-splines are inferred from B\u00e9zier curves<\/li>\n<li>Polylines optionally are inferred from a contiguous series of lines and arcs<\/li>\n<li>Solid hatches optionally are inferred from filled areas in the PDF<\/li>\n<li>Lines with a dashed linetype optionally are inferred from a series of collinear lines that approximate a dashed line (this option is not always desirable)<\/li>\n<\/ul>\n<p><strong>Note:<\/strong> Text objects that originally used SHX fonts can be reconstructed with the PDFSHXTEXT command<br \/>\nThe important concept? The inference process is imperfect and will often require cleanup.<\/p>\n<div id=\"attachment_2695\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/res.cloudinary.com\/dnngwl1yi\/image\/upload\/v1572908984\/autocad-2017-pdf-import-options_lmqywf.png\" rel=\"attachment wp-att-2695\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2695\" class=\"size-medium wp-image-2695\" src=\"https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-options_lmqywf-300x202.png?cld_params=q_auto,w_auto:100:744\/w_300\" alt=\"Import PDF dialog box options available. AutoCAD 2017 PDF Import.\" width=\"300\" height=\"202\" srcset=\"https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-options_lmqywf-300x202.png 300w, https:\/\/www.autodesk.com/blogs\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-options_lmqywf.png 744w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-2695\" class=\"wp-caption-text\">Options available in the Import PDF dialog box<\/p><\/div>\n<h2 id=\"conclusion\">Conclusion<\/h2>\n<p>When it comes to PDF to DWG conversion, it\u2019s best to think of PDF as a form of electronic plot output that\u2019s great for visual reference, embedded hyperlinks, and limited transfer of information between different functional groups and audiences.<\/p>\n<p>Here are some tips:<\/p>\n<ul>\n<li>When you need to maintain precision, be careful about mixing data from different sources that do not maintain the same level of precision.<\/li>\n<li>Some PDFs are generated with the dpi output deliberately set low to provide only a visual representation with low precision.<\/li>\n<li>Similarly, some PDFs contain only a raster scan of a drawing. AutoCAD doesn\u2019t support raster-to-vector conversion. Converting raster images to vector data with specialized software cannot provide the same level of precision as objects created directly with AutoCAD.<\/li>\n<\/ul>\n<p>When you understand the underlying limitations inherent in PDF files, you can set reasonable expectations and get the maximum benefit from this valuable capability in AutoCAD.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article was updated on\u00a0October 26, 2018\u00a0to reflect the recent enhancements and bug fixes made to this feature. AutoCAD-based products can import data directly from PDF files into your drawing files, but are there any practical limitations to know about? The answer depends on your intended use. For example, if you\u2019re simply importing catalog items, [&hellip;]<\/p>\n","protected":false},"author":122,"featured_media":2689,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[893],"tags":[11,418,14,433,266],"class_list":["post-2683","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learning","tag-autocad","tag-autocad-2017","tag-autocad-lt","tag-autocad-lt-2017","tag-pdf","dhig-theme--light"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>AutoCAD | PDF Import and DWG Data | Guidance<\/title>\n<meta name=\"description\" content=\"AutoCAD PDF Import is very useful. But be aware of the limitations to working with PDF and DWG data, depending on how much precision you require.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.autodesk.com/blogs\/autocad\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AutoCAD PDF Import: Guidance for Working with PDF and AutoCAD DWG Data\" \/>\n<meta property=\"og:description\" content=\"AutoCAD PDF Import is very useful. But be aware of the limitations to working with PDF and DWG data, depending on how much precision you require.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.autodesk.com/blogs\/autocad\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\/\" \/>\n<meta property=\"og:site_name\" content=\"AutoCAD Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/autocad\" \/>\n<meta property=\"article:published_time\" content=\"2016-03-22T22:44:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-04-07T21:51:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/i0.wp.com\/blogs.autodesk.com\/autocad\/wp-content\/uploads\/sites\/35\/2020\/04\/autocad-2017-pdf-import-floor-plan_pbvw40.png?fit=458%2C445&ssl=1\" \/>\n\t<meta property=\"og:image:width\" content=\"458\" \/>\n\t<meta property=\"og:image:height\" content=\"445\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Dieter Schlaepfer\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@autocad\" \/>\n<meta name=\"twitter:site\" content=\"@autocad\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dieter Schlaepfer\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\\\/\"},\"author\":{\"name\":\"Dieter Schlaepfer\",\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/#\\\/schema\\\/person\\\/f924dae2e89d5e1a3986cdbe418492a1\"},\"headline\":\"AutoCAD PDF Import: Guidance for Working with PDF and AutoCAD DWG Data\",\"datePublished\":\"2016-03-22T22:44:53+00:00\",\"dateModified\":\"2020-04-07T21:51:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\\\/\"},\"wordCount\":1068,\"publisher\":{\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/wp-content\\\/uploads\\\/sites\\\/35\\\/2020\\\/04\\\/autocad-2017-pdf-import-floor-plan_pbvw40.png\",\"keywords\":[\"AutoCAD\",\"AutoCAD 2017\",\"AutoCAD LT\",\"AutoCAD LT 2017\",\"PDF\"],\"articleSection\":[\"Learning\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\\\/\",\"url\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\\\/\",\"name\":\"AutoCAD | PDF Import and DWG Data | Guidance\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/pdf-import-guidance-working-with-pdf-and-autocad-dwg-data\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.autodesk.com/blogs\\\/autocad\\\/wp-content\\\/uploads\\\/sites\\\/35\\\/2020\\\/04\\\/autocad-2017-pdf-import-floor-plan_pbvw40.png\",\"datePublished\":\"2016-03-22T22:44:53+00:00\",\"dateModified\":\"2020-04-07T21:51:24+00:00\",\"description\":\"AutoCAD PDF Import is very useful. 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