Open Source Apps with 'Sign PDF files' feature

Open-source suite for editing documents, spreadsheets, presentations, forms, and PDF files with co-editing modes, plugin support, AI assistant, and integration across 40+ platforms.

Multi-platform document viewer supporting PDF, comics, EPUB, images, and Markdown with annotation tools, sidebar navigation, and text-to-speech features.

locally hosted web application that allows you to perform various operations on PDF files.

BentoPDF is a PDF Toolkit that works fully offline with no sign ups. It's fast, secure and forever free. In an era where data is a commodity, we take a different approach. All processing for BentoPDF tools happens locally in your browser.

DocuSeal allows you to create, fill, and sign digital documents. Use for free in the Cloud or on-premises. #1 Open source alternative to DocuSign, Pandadoc etc. Developer-friendly and can be integrated into apps.

Privacy-first PDF utility (Zero-Server Architecture). Merge, split, compress, and edit PDFs 100% locally on your device. No uploads, no servers, no tracking.

Free open-source web software for signing (alone or with others), organizing (merge, sort, rotate, delete, extract pages, ...), editing metadatas or compressing PDFs.

Open Scanner is a fast and simple-to-use paper-scanning app with AI features to speed up your scanning workflow:

OpenScan is an open source app that enables users to scan hardcopies of documents or notes and convert it to PDF or JPEG files. Its motto is "No ads. No data collection. We respect your privacy.".

Open-source PDF viewer/editor using Qt framework with C++ library, multithreading, hardware rendering, encryption, text layout, and form tools.

Open-source PDF e-signature solution with secure cryptographic signing, audit trails, completion certificates, API integration and multi-device support.

A PDF Editing tool that ensures your privacy. Open source, available on Windows, MacOS and Linux. Available in 4 Languages (English, Bengali, Chinese and Japanese). Ambient vibes are also included....

LibreSign is a web application for electronic signatures (e-Sign) that offer the possibility of signing documents online with security and agility.

jPDF Tweak is a Swiss Army Knife GUI application for PDF documents: combine, split, rotate, reorder (n-up, booklet), watermark, edit bookmarks/fileinfo/pagetransition, compress, encrypt, decrypt, sign, repair, edit attachments and more.

Bookworm is a document reader that allows you to read more than 15 document formats including PDF, EPUB, and MOBI using a versatile, yet simple, and highly accessible interface.

JSignPdf is a Java application which adds digital signatures to PDF documents. It can be used as a standalone application or as an Add-On in OpenOffice.org. The application uses the jsignpdf-itxt library for PDF manipulations (based on iText library in version 2.1.

PortableSigner is a signing (with X.509 certificates) program for PDF files. It's platform independent and runs (tested) under Windows (2000, XP, ...), Linux, and macOS.

Look Scanned is a pure frontend site that makes your PDFs look scanned! No need for printers and scanners anymore - everything you need to do is just a few clicks.

Subnoto is the only e-signature platform that keeps your documents confidential at all times, even during signature.

OpenSignature is an open source project for the digital signature of documents. It works with all cards supported by OpenSC and focuses on adding support for cards from accredited Italian CAs.

The Apache PDFBox™ library is an open source Java tool for working with PDF documents. This project allows creation of new PDF documents, manipulation of existing documents and the ability to extract content from documents.

This document scanner application is developed for windows only. Compatible with both WIA and TWAIN. Users can Rotate, crop, rearrange scanned images and identify texts using OCR module