How do I convert a PDF document to a preview image in PHP?

Question

What libraries, extensions etc. would be required to render a portion of a PDF document to an image file?

Most PHP PDF libraries that I have found center around creating PDF documents, but is there a simple way to render a document to an image format suitable for web use?

Our environment is a LAMP stack.

Answer 1

You need ImageMagick and GhostScript

<?php
$im = new imagick('file.pdf[0]');
$im->setImageFormat('jpg');
header('Content-Type: image/jpeg');
echo $im;
?>

The [0] means page 1.

Answer 2

For those who don't have ImageMagick for whatever reason, GD functions will also work, in conjunction with GhostScript. Run the ghostscript command with exec() to convert a PDF to JPG, and manipulate the resulting file with imagecreatefromjpeg().

Run the ghostscript command:

exec('gs -dSAFER -dBATCH -sDEVICE=jpeg -dTextAlphaBits=4 -dGraphicsAlphaBits=4 -r300 -sOutputFile=whatever.jpg input.pdf')

To manipulate, create a new placeholder image, $newimage = imagecreatetruecolor(...), and bring in the current image. $image = imagecreatefromjpeg('whatever.jpg'), and then you can use imagecopyresampled() to change the size, or any number of other built-in, non-imagemagick commands

Answer 3

You can also get the page count using

$im->getNumberImages();

Then you can can create thumbs of all the pages using a loop, eg.

'file.pdf['.$x.']'

Answer 4

Use the php extension Imagick. To control the desired size of the raster output image, use the setResolution function

<?php    
$im = new Imagick();
$im->setResolution(300, 300);     //set the resolution of the resulting jpg
$im->readImage('file.pdf[0]');    //[0] for the first page
$im->setImageFormat('jpg');
header('Content-Type: image/jpeg');
echo $im;
?>

(Extension on Paolo Bergantino his answer and Luis Melgratti his comment. You need to set the resolution before loading the image.)

Answer 5

If you're loading the PDF from a blob this is how you get the first page instead of the last page:

$im->readimageblob($blob);
$im->setiteratorindex(0);

Answer 6

You can also try executing the 'convert' utility that comes with imagemagick.

exec("convert pdf_doc.pdf image.jpg");
echo 'image-0.jpg';

Answer 7

I'm the author of PDFlib which is a GhostScript wrapper for php, advantage of using this library is, it is already tested and it does not require ImageMagic

Always GhostScript commands are faster than ImageMagic when it comes to pdf so you should either go for a GhostScript wrapper or pure GhostScript commands

$pdflib = new ImalH\PDFLib\PDFLib();
$pdflib->setPdfPath($pdf_file_path);
$pdflib->setOutputPath($folder_path_for_images);
$pdflib->convert();

Answer 8

Think differently, You can use the following library to convert pdf to image using javascript

http://usefulangle.com/post/24/pdf-to-jpeg-png-with-pdfjs

Answer 9

I install finished! It's worked!

You may be do base install imagemagick on windows.

In php (local) use call exec(<command line>) ex:

<?php
$pdf = "filename.pdf";
$info = pathinfo($pdf);
$file_name =  basename($pdf,'.'.$info['extension']);
echo $file_name;
$pdf = "filename.pdf[0]";
exec("convert $pdf convert-img/$file_name.jpg");    
?>

Besides, you may be use class imagick in PHP Imagick class

Thanks all helped me!

Answer 10

Here is a simple class I've written and used on a couple of projects. It just wraps imagick and handles writing each page out to disk. If anyone is still looking for an easy way to do this, this link might be helpful.