ComPDFKit

Professional PDF SDK/API empowers your apps with powerful PDF viewing capabilities, bringing a smooth and comfortable reading experience to your application. It provides zooming, reading modes, rotation, and other features that adapt to the reading habits on different platforms.

Rich PDF annotation library enables your application to support adding, setting, importing, exporting, flattening, commenting, replying, managing, displaying/hiding dozens of annotations, including text, stamps, highlights, underlines, strikethroughs, wavy lines, shapes (rectangles, circles, etc.), arrows, lines, freehand pens, links, voice notes, etc.

Provide electronic signatures and digital signatures, support multiple types of signatures for signing documents such as image signatures, font-based signatures, touch pen or handwriting pen signatures, as well as digital signatures that include the signer's identifying information. Meet all your sign needs for your application. Easily sign and verify PDF documents and ensure the integrity and authenticity of the documents.

Edit PDF text and images flexibly like editing Word documents. Integrate PDF Content Editor SDK/API to make it possible to add, delete, replace, or move text and images in PDF documents in your app and support viewing and setting properties such as font, color, size, etc.

Our PDF SDK provides a complete PDF form function that allows your application to easily create and fill out PDF forms. Provide various form field tools such as text field, push button, check box, radio button, combo box, list box, signature fields, and barcode (PDF417, QRCode, DataMatrix) to make it easy for your app users to design and layout forms.

Provide convenient PDF page management functions that support easy operation and editing of PDF pages such as moving, adding, deleting, merging, splitting, replacing, and rotating PDF pages.

Provide password protection functions for your apps/systems. Easily set different encryption levels of encryption methods for documents such as RC4 and advanced encryption algorithms AES-128 & AES-256. You can even set different document permissions for different roles such as reading, printing, copying, sharing, etc. Support adding watermarks, headers, footers, and bates numbers to PDF documents in batches.

Integrate PDF Compare Documents function to perform accurate comparison by keyword and list all the changes like added, replaced, and deleted the text of the documents. Provide overlay comparison methods to effectively compare drawing documents.

Based on AI's PDF conversion library it has higher conversion accuracy. Quickly and efficiently convert PDF files to other formats or convert other formats of files to PDF documents. Supported formats include Word, Excel, PPT, PNG, JPG, RTF, CSV, HTML, etc.

Provide powerful OCR SDK/API that allows you to easily recognize text in images or scanned files with your application. Support file layout analysis and image preprocessing functions to improve the recognition effect of low-quality images. Support recognition of dozens of languages such as commonly used English, Chinese, Spanish, French, etc.

Integrate the redaction function to easily cover and remove sensitive information or confidential text or image information in PDF documents with your application. Support setting the style, color, and text description of the redaction. Once applied, the erased information cannot be recovered and accessed.

Excellent document compression SDK/API that allows you to easily compress or optimize one or more PDF files in your application. Delete redundant data, and reduce file storage and transmission pressure. Provide different levels of document compression for users to choose from.