![]() If you convert that PDF to a JPG, however, you can upload it directly to those social networks! If you wanted to share that advertisement on social media, you wouldn’t be able to, because most social media sites - Twitter, Facebook, Instagram, etc. As an example, let’s say you have a print advertisement for your restaurant in PDF. Having a JPG version of a PDF allows you to do more with that document. You can’t upload a PDF to Instagram, for example, because Instagram only accepts image files. ![]() This means you can’t upload PDF files to image-based systems. However, PDF files are classified as documents, not images. This may make PDF files seem similar to images. In other words, you can draft a PDF file on a Windows PC and it will look the same on an iPhone, a MacBook, or even a television. They usually have text, links, and sometimes images, but they are viewed universally on all systems. ![]() PDF files are like snapshots of document files. Common image file formats are JPG, PNG, and TIFF, for example. I don't trust any online service for anything.Images are files that contain graphical information, usually of a photograph, drawing, or another kind of visual media. To answer the question in the thread title: No. That dissects the file and identifies every segment present. Unfortunately there's no way for a user to find this data, except to run a program like the one I wrote This is where malware can hide, if properly formed. PDF files can also contain binary information that does not contribute to the printed output. In doing so you lose the text search capability. The graphics are already effectively compressed, so the only thing they can shrink is the images.Īlternatively, they can print the document (in the computer memory), then re-code it entirely PDF files can contain three specific types of content (multiples of each, in any order):Ģ) simple graphics, like line drawings, charts, etc., I will confess that I've never tried to shrink a PDF file, so I can't vouch for that functionality. I've used it for various manipulations for several years, with excellent results. The full version with no added text is only like $15. There's a freebie versions that puts some text at the bottom of the (?first?) page. How would I know if a PDF is malformed or contains malware? If I send a blank PDF to the service, is there a way to examine the file to see if it's safe? I've decided not to trust this service until I get confirmation it's safe. Fewer know that javascript is turned on by default in most PDF readers a PDF that contains javascript can be used to take over one's computer (hint: turn off javascript in your PDF reader! It's just not needed.) ![]() Many of us are aware that malformed PDFs can trivially be used to trigger Adobe Reader exploits, taking over one's computer. I know that shouldn't in itself be a suspicious attribute, but it did cause me to wonder just how safe any online service would be that would take your document and send it back altered. I did a Whois search and found it to be a Chinese company. I simply uploaded the PDF and then clicked Download, and here it came, looking good.īut I'm not endorsing this product yet. I tried it and it works, shrinking a 16MB document to 3.6 MB. Until now, the least expensive solutions I've found are PDFShrink ($39), and NovaPDF ($49). That simple setting will result in PDFs about 25% the default size, and of good quality.Īdobe Acrobat will compress PDFs, but not everyone can spend $400. This results from the sender scanning them using the scanner's default resolution rather than optimizing it for size at 144 or 150 dpi. I often receive PDFs of unnecessarily huge file size. ![]()
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