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For example, Preview doesn’t correctly handle editing documents containing stamp annotations, which results in stamps appearing differently or not at all when a document is opened again in Preview or any other PDF reader.
While - as long as an appearance stream is emitted - most annotations render correctly, there are issues related to rotated documents. Most documents render correctly or well enough to be usable. However, the above issues are edge cases. As of PSPDFKit 5 for iOS, we switched to a custom renderer because of these issues, and because Apple’s focus is clearly not on improving its PDF rendering engine. Most of these radars are unresolved to this day. It’s quite capable, but it is known to crash/ freeze or not show content on several files or certain API call combinations. Apple macOS High Sierra/Sierra (Safari/Preview/Quick Look)Īpple uses a custom PDF renderer (CGPDF) that’s part of Core Graphics. The default viewers that ship with operating systems are not always as capable. You can evaluate our compatibility via the free PDF Viewer apps for iOS, macOS, and Android and our PSPDFKit for Web demo instance.
(However, some icons, like notes, have been tweaked to better match their respective platforms.) Our shared core ensures that annotations created with PSPDFKit SDKs from multiple platforms are especially compatible and render similarly. In using standard compliant software, annotations can, for example, be created using PSPDFKit for iOS, edited in Adobe Acrobat for Windows, and later displayed and edited/deleted on PSPDFKit for Web or Android. Any ISO-compliant viewer (like Adobe Acrobat) will be able to display and edit such annotations and forms. PSPDFKit writes annotations in accordance with the standardized ISO 32000-1:2008 PDF specification.
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