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Convert your PNG images and combine them into a single PDF document. Like it? Share it! 1To start the conversion, upload one or more PNG images. You can also upload images via the link or from file storage. 2After uploading, click the "Convert" button and wait for the conversion to complete. Remember that you can edit the list of images by deleting or adding them. 3Now your PDF is ready! You can download the combined PDF document or separate PDF for each PNG image. The PNG (Portable Network Graphics) format was created as an alternative to GIF, which at that time had a number of significant limitations. In particular, it is the need for a license to use that did not meet the requirements of the time. The PNG format has become completely open and patent-free. Another significant difference is in technical specifications. First, PNG allowed the use of a significantly larger number of colors (up to 16.7 million in PNG-24).

Secondly, support for full-fledged multi-level transparency with the use of so-called alpha channels. Hence the possibility of working with layers. All this led to the great popularity of the format among users. With the growing popularity of PNG images, people often use conversion services, and our converter is a great tool to convert PNG images to a PDF document. PDF (abbreviation for Portable Document Format) is a format created for the convenient presentation and use of electronic documents. PDF was developed by Adobe in 1993 and has since gone a long way before gaining popularity. Initially, it was a closed format with a lot of restrictions, which is why it practically was not used widely. However, at this point, Adobe has eliminated many shortcomings. An official free reading program (Adobe Reader) was released, PDF is supported on most operating systems, the functionality was noticeably expanded, the file size was optimized, and much more.

The professional and free versions are the same program. Features in the free version, such as adding comments and highlighting, can be used without any watermark being added. The professional features are also available in the free version, but documents are saved with a watermark until it is registered. A warning dialog is shown if you attempt to use the professional features in the free version. Either cancel the action, or don’t save the document to avoid adding watermarks. In the Viewer, security options can be changed in Preferences, in the Editor, they can be changed in Document Properties, Security. When a secure document is open in the Editor, a padlock icon is shown on the Tab Bar indicating that there are some restrictions on modifying the content. No preview thumbnail is shown for PDF files that need a password to be opened. Open the Search Pane to find text in the current document, all open documents, or documents in folders on your hard drive.

In my tests, PDF-XChange Editor is much faster than the latest Adobe Reader DC. My personal collection of PDF documents, some of which may contain the search string several times, while others may not contain it at all. Most of the test set doesn’t change. F) of multiple PDF documents as the menu on the right shows. The Proximity search lets the user specify whether to find only adjacent words, words in the same paragraph, page, or document. To highlight the first, second, and subsequent words in the search string that have been found, the Coloured Search Results option displays them in different colours. This may be overkill for ordinary users, but for those who have to trawl through large collections of PDF files it may be very useful. It’s certainly a big improvement on the Advanced Search in Adobe Reader, though the colours need some refinement. Shortcuts F4 and Shift F4 will find the next and previous search results. These can be customised if you prefer to use the Adobe Reader defaults of Ctrl G and Ctrl Shift G. Personally, I find F4 more intuitive since F3 and Shift F3 are used for find in page.

I never noticed the Adobe Reader shortcuts before. PDF-XChange can find ligatures used in OpenType fonts. There is an option in Preferences, Page Text to preserve ligatures on copy. If the checkbox is cleared, æ (for example) will be copied as ae. The Editor can read selected text using a computer generated voice with a male or female American accent, or a female British accent. It works well on standard English text, but it fails to recognise non-standard ligatures, and foreign words are hard to understand. K) and shortcuts can be assigned to "Read Select Text Out Loud" and "Stop Reading." I assigned shortcuts "r," and "Shift R" respectively for easy of use. The process takes a few minutes - perhaps 15 seconds per page - but the resulting document is then searchable without any obvious visible change to the document, and without much increase in file size. A typical 20 page PDF of 5.18 Mbytes was 5.4 Mbytes after OCR and saving as a new document.

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