|Internet media type||image/png|
|Description:||PNG pronounced ping is a format for storing bitmapped (raster) images on computers. It was created originally to replace the GIF file format when it was announced that the companies who created the GIF format wanted royalties. PNG uses indexed colors and lossless compression (like a .GIF file), but without those copyright limitations; it cannot be animated like a GIF image.|
|Technical Details:||PNG images are in many ways better than .GIF as they also include an 8-bit transparency channel, which allows the colors in the image to fade from opaque to transparent; GIF images only support fully opaque or fully transparent pixels. PNG supports palettes of 24-bit RGB colors, RGB images or greyscale or RGB images. PNG was intended to be able to transfer images on the Internet, not professional graphics, and so does not support other colour spaces (such as CMYK).|
|Developed by||PNG Development Group (donated to W3C)|
|Useful links:||Further information on PNG Files. How can I open a PNG file?|
If a PDF document is password protected, you’ll have to enter the password each time you want to view the document. Password protecting a document is necessary for many reasons. For controlling access to the information specified in the document. Say for example, your file is on a publicly-accessible source but contains confidential data that only certain individuals should have access to. In this case, you share the password you have specified for the document with a limited number of people. Another reason could be that establishing limited access to the document means protecting it from any possible changes. If you’re sending a contract to your stakeholders, you’ll want it to be printed and signed but not altered. You can let your partner peruse the document and be sure that it remains in its original form. One more case is locking forms that are used for filling via a link. Any user may accidentally or deliberately alter a form if it’s not locked.
Although locking files is definitely considered to be very useful, what are you going to do if something changes? You want to provide access to your document’s content and coding is no longer needed. Specifying a password is now one more unnecessary step. Accessing PDFs in a secure location is inconvenient. It goes without saying, that protected files are unavailable for editing or formatting. The solution is simple: just remove the password-protection. Now you have the ability to use a powerful brand new tool to unlock PDF files.
AltoUnlockPDF gives you the ability to remove password-protection in a few clicks. Use any internet connected device to instantly upload a PDF to the server. To avoid the useless jumble of words and expressions, here is a list of the main features of this service:
To begin unlocking and editing PDF contracts, agreements, invoices, medical or tax forms, follow these steps:
If you’ve unlocked PDF file for editing, open your PDF editor and click anywhere on the document to start adding text. Change the font, size and color of your text to your preference.