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

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140
votes
15answers
244k views

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

Do you know a good Windows software to compare PDF files side-by-side and show the modifications between the two? It would be great if you can post both free and not-free products.
79
votes
10answers
109k views

Combine/merge PDF files in Windows? [closed]

Is there a painless way to combine/merge PDF files in Windows? I understand that pdftk will do it on Linux.
64
votes
13answers
153k views

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 ...
62
votes
10answers
57k views

How to convert a PDF document to PNG?

Is there a free way to convert a PDF document to a PNG image?
62
votes
9answers
63k views

Stop PDFs from displaying inside Google Chrome

When I click on a PDF link in Chrome, it opens automatically inside the browser window. How can I get it to download instead and open with an external viewer? Update: I implemented djhowell's ...
60
votes
2answers
6k views

Why are PDFs generated from MS Word so large?

I created a simple MS Word document containing just this sentence: This is a small document. Nothing else. Then I've saved this document as DOCX and a PDF. Here are the file sizes: DOCX: 12 kB ...
53
votes
2answers
57k views

Export PowerPoint to PDF with each animation on a separate slide

I have a PowerPoint presentation where I extensively use simple animations, only appear/disappear effects triggered by the mouse (not time based), without any smooth transitions. Is it possible to ...
52
votes
1answer
3k views

How does less display PDFs?

I have tried several programs: pdftotext, pdf2txt.py, ... All of them can extract text from PDFs, but the one which is doing the better job is good ol' less: the text from the PDF has a proper layout. ...
44
votes
4answers
57k views

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." ...
40
votes
3answers
18k views

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 ...
39
votes
14answers
2k views

PDF Viewer on Windows [closed]

I've tried Foxit and Adobe's reader, but I'm not satisfied with either. Foxit has update nagging for non-critical junk. Adobe PDF reader is bloatware. Are there other options you people like?
39
votes
7answers
23k views

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 ...
37
votes
5answers
30k views

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 ...
33
votes
17answers
3k views

How to print documents to pdf [closed]

I like to print PDFs of my documents. I've been using PDFCreator. Is this a good choice, are there any better solutions?
32
votes
4answers
13k views

Make Chrome always open PDFs itself

I'm looking for a way to make Google Chrome always open PDFs with its internal viewer when I click a link, as opposed to downloading it to the default location. It works with most URLs, but some ...
31
votes
10answers
41k views

How to extract text with OCR from a PDF on Linux?

How do I extract text from a PDF that wasn't built with an index? It's all text, but I can't search or select anything. I'm running Kubuntu, and Okular doesn't have this feature.
30
votes
5answers
34k views

How to search inside PDFs with Windows Search?

I'd like to use Windows Search for searching through multiple PDFs in one go, but I see that in the Indexing Options' Advanced Options screen, PDF files don't have a registered IFilter: What is an ...
29
votes
9answers
79k views

How to convert Word (doc) to PDF in linux?

I have a set of files in .doc format, that need to be converted to .pdf format. I am using Ubuntu linux.
28
votes
7answers
23k views

How to extract image from PDF file

I currently use Foxit's PDF reader, and I recently downloaded an image from the Internet, but it is inside a PDF file. How do I extract this image? Operating system is Windows 7.
28
votes
1answer
13k views

Acrobat Reader & saving last page I read?

I like to read eBooks, but I tend to have a hard time keeping track on which page I am in which file. Is there a bookmark function or something similar that I'm not aware of?
27
votes
9answers
135k views

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?
27
votes
7answers
6k views

Stop Microsoft Word 2010 from smoothing screenshots?

When I insert JPEG screenshots into Microsoft Word, it smoothes them instead of preserving the original pixels from the bitmap. When I then print to PDF (using Acrobat Distiller), depending on my ...
26
votes
9answers
97k views

Batch convert Word documents to PDFs

How do I batch convert many Word documents and have them saved as [originalfilename].pdf?
26
votes
14answers
255k views

How to save a rotated Adobe PDF file

I received an Adobe PDF scan of a document that displays upside-down. I rotated it inside Adobe Acrobat and chose Save As to make a new document, however, the rotation is not saved and when I open ...
26
votes
4answers
21k views

How can I split a PDF's pages down the middle?

Does anyone know of a good way to split a pdf's pages down the middle into two new pages? To be clear, I'm not trying to split out already existing pages from a pdf; I am trying to create two new ...
26
votes
1answer
30k views

Two-page view in full screen for Adobe Acrobat

Since i'm using a wide screen, i want to view two page in full screen while reading PDF. I can view two page in Reading Mode or normal view. however, whenever i switch to full screen mode, acrobat ...
24
votes
9answers
70k views

Can't copy text from a pdf file

I am using foxit PDF reader to view my text book. I would like to copy the text from the pdf file into a word document but it won't let me. I can select the text fine but the option to copy text is ...
24
votes
2answers
21k views

How to extract vectors from a PDF file?

I have a PDF file with vector images inside it. (I downloaded it from the internet, so I do not have any originals.) I wish to extract the vectors so that I can overlay them on some other images; use ...
23
votes
5answers
57k views

How to remove a watermark from a PDF file?

I thought this would be a simple task, but it turned out the other way. The watermark is the very same (overlapping, but transparent) image on every single page. I created the PDF file myself (so no ...
23
votes
4answers
35k views

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?
23
votes
8answers
3k views

How to change internal page numbers in the meta data of a PDF?

I have a pdf document I created through non-Acrobat means (printing to pdf, then merging a bunch of pdfs), but I'd like to manually change the page numbers (i.e. the first several pages are simply ...
23
votes
12answers
55k views

How can I sign a PDF document quickly and cheaply?

I need to sign a PDF document. However, Adobe Reader does not let me sign documents. I just need to sign the document, not edit it. Do I need to buy the full Acrobat software? Or is there a better, ...
22
votes
12answers
78k views

How do I save an image PDF file as an image?

I have a PDF that contains a scan image of a document. I want to save the contents of this PDF as an image so that I can then run it through an OCR program that only accepts .jpg, .png, and .gif type ...
22
votes
2answers
16k views

adobe acrobat reader - how to save your place?

I'm trying to read an ebook in adobe acrobat reader and I want to save the position I'm at between computer reboots / closing reader. How can I save the page I'm at, or even better auto save? Is ...
22
votes
4answers
68k views

How to disable automatic opening of PDF files in chrome [duplicate]

Possible Duplicate: Stop PDFs from displaying inside Google Chrome Chrome is opening the PDF files automatically and don't give option to save the file. How can i change this behavior?
21
votes
4answers
22k views

How to open two independent instances of Foxit Reader?

I'm trying to open two PDF files simultaneously, in order to compare their contents, one on the right (Win→) and another on the left (Win←) side of my screen. Unfortunately I'm trying ...
20
votes
6answers
28k views

How to merge pdf:s using Imagemagick (resolution problem)

When I try to merge two .pdf files using Imagemagick convert pdf1.pdf pdf2.pdf temp.pdf the resulting temp.pdf file seems to have very low resolution. How can I keep the resolution same as in the ...
20
votes
8answers
132k views

How to copy text out of a PDF without losing formatting?

When I copy text out of a PDF file and into a text editor, it ends up mangled in a variety of ways. Formatting like bold and italics are lost; soft line breaks within a paragraph of text are converted ...
20
votes
5answers
23k views

How to convert a multi-page PDF file to PNG files, with one PNG file per page of the PDF document?

How do I convert a multi-page PDF file to PNG files, and automatically save one PNG file per page of the PDF document (for Windows 7)? I have tried virtual printers (CutePDF, Bullzip PDF Printer) and ...
20
votes
6answers
4k views

Convert PDF to Word document? [closed]

Any software/idea how to convert pdf document to word document?
20
votes
3answers
10k views

How to automatically open “saved” pdfs in system viewer on chrome?

As discussed in ghacks and slashdot Chrome no longer lets you automatically open downloaded pdfs in your System viewer. In general, I like using the built-in Chrome PDF viewer, but for some longer ...
19
votes
5answers
25k views

How to open 2 Adobe Reader instances?

I would like to see simultaneously pages in the beginning of the document and at the end. I can do that by opening the same document on different windows. But when I try to do so, the first instance ...
19
votes
6answers
35k views

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 ...
19
votes
2answers
8k views

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 ...
19
votes
6answers
24k views

Are there tools available for trimming PDF margins?

I have an ebook I'm trying to read in PDF format on a Kindle. Unfortunately, the page headers and footers have some content (page number and copyright info, respectively) preventing the device from ...
19
votes
5answers
10k views

How to take notes in PDFs in Linux

In Adobe Acrobat Pro you can do things like put little sticky notes in PDFs, highlight text, and create bookmarks. I have found this very useful for learning. In school you learn better when you put ...
19
votes
7answers
70k views

How to crop permanently in Acrobat?

After cropping anything by using the crop tool in Adobe Acrobat, how do I ensure that the cropped area is fixed and can't be seen even when I increase the crop margin? For example: how would I crop ...
19
votes
5answers
78k views

How to open pdf in Chrome's integrated viewer without downloading it

So I was really excited about the new integrated pdf viewer in chrome. However when I click on a pdf file link, chrome offers to download it instead of opening it inside its viewer. How do i get it ...
19
votes
7answers
43k views

How to merge multiple PDF files onto one page with pdftk?

I have a range of PDF files 1.pdf, 2.pdf, etc. that I would like to merge into one file, with all the PDFs tiled on one page. Currently, I have tried pdftk to merge these files, but they are put on ...
19
votes
1answer
5k views

How do I automatically convert academic papers (PDF) for reading on a Kindle?

I got a Kindle for Christmas and I'd like to read some academic papers on it. Almost all of those papers are in either PostScript or the PDF format and made for A4-sized paper. See the example here. ...