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Questions tagged [pdf]

Portable Document Format (PDF) is a platform-independent standard developed by Adobe System in 1993 for document exchange.

PDF (Portable Document Format) is a file format created in 1993 by Adobe Systems. PDF was meant to be Adobe's successor to .

Popular questions

Programs and applications

Modern browsers are also able to view PDFs directly from a tab.

3786 questions
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15 answers

How Can I Convert Github-Flavored Markdown To A PDF

I have recently started learning Markdown for use with documentation, and need to print out a few of my Markdown pages. I would like to use a command-line, Terminal, etc. utility that allows me to convert Github-flavored Markdown to PDF. It needs to…
dillmo
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233
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19 answers

How to compare the differences between two PDF files on Windows?

Do you know a good way to compare PDF files side-by-side and show the modifications between the two? I'm looking for Windows software to accomplish this. It would be great if you can post both free and not-free products.
Nelson Reis
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166
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11 answers

How to convert a PDF document to PNG?

Is there a free way to convert a PDF document to a PNG image?
Raymond
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162
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9 answers

Combine/merge PDF files in Windows?

Is there a painless way to combine/merge PDF files in Windows? I understand that pdftk will do it on Linux.
user1413
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150
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3 answers

Why does Chrome sometimes download a PDF instead of opening it?

When I go to certain addresses of PDF files, Chrome downloads the PDF instead of opening it using its built-in PDF viewer. The page is then blank white. There is no problem with my Chrome settings: I try addresses of other PDF files, and Chrome…
Rgrthat
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149
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15 answers

How to know which fonts are used in selected part of a PDF document

I'm using Foxit Reader as default PDF viewer. How can I see what type of font is used for a selected part of a PDF document? (If this can only be done with another software, I'd prefer a freeware as I don't want to pay for just viewing selected…
Mehper C. Palavuzlar
  • 55,953
127
votes
6 answers

How can I fix/repair a corrupted PDF file?

Does anyone have any recommendation or procedures for repairing a corrupt PDF? When I open the file I get "There was an error opening this document. the file is damaged and cannot be repaired." There seems to be a myriad of tools out there but…
user15968
122
votes
16 answers

How to remove security from a PDF file?

I am trying to fill out some docs, but the provided PDFs are "SECURED", meaning I can't use FoxIt's typewriter tools. Is there any way to remove the security?
AngryHacker
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108
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4 answers

Convert a PDF to greyscale on the command line in FLOSS?

I have a colour PDF file, and I'm going to print it out and then photocopy it in black and white. I'd like to know what it's like in B&W before photocopying it. Is it possible to 'greyscale' a PDF on the command line using free software? I'm using…
Amandasaurus
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99
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3 answers

Can't convert PDF into image, because of 'no images defined' error

I've the following PDF file: http://www.fmwconcepts.com/misc_tests/pdf_tests/test.pdf But when I'm trying to convert it via: $ convert test.pdf test.png I've the following error: convert: no images defined `test.png' @…
kenorb
  • 26,615
98
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12 answers

What's the back button of Adobe PDF Reader after clicking a hyperlink whose target is on the same document?

PDF documents have hyperlinks to the contents on the same document (analogous to "#section" hrefs for an HTML document). Where's the back button to go back to the page I was on (where I clicked the hyperlink)? Let's say I'm on the index of a PDF…
Srikanth
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98
votes
12 answers

Count the number of words in a PDF file

How can I get the word count of a PDF file? I think that most pdf files for which I want to get total word count have text layer embedded, so I need no OCR. The task was arisen from searching for some scientific papers of known size, e.g. 15000…
osgx
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92
votes
6 answers

Split PDF document from command line in Linux?

I would like to extract page ranges from a PDF document into a new PDF document using the command line in Linux. Note that: PDFtk - The PDF Toolkit fails for me with: $ pdftk input.pdf cat 1 verbose output output.pdf Error: Failed to open PDF…
sdaau
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92
votes
8 answers

How do I convert a DjVu document to PDF in Linux using only command line tools?

I've got some documents in DjVu which I'll like convert to PDF. Is there a way to do this using command line OSS tools?
GeneQ
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86
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6 answers

How can I split in half a double-page scanned PDF in a single pass?

I have a scanned course and it has two pages, consecutive are showing as one page. How can I automatically split all the pages in one pass? Usually this is done by cropping odd and even pages and then merge them back together but this could take…
Eduard Florinescu
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