pdf.io

Pdf.io

pdf.io is a PDF editor that allows you to view, edit, sign, and comment on PDF documents online. Its key features include annotation tools, form filling, e-signatures, and collaboration features.
pdf.io image
pdf editor annotate view edit sign comment form-fill esignature collaboration

pdf.io: View, Edit, Sign & Comment on PDFs Online

A PDF editor with annotation tools, form filling, e-signatures, and collaboration features for online PDF viewing and editing.

What is Pdf.io?

pdf.io is an online PDF editor that provides a suite of tools for working with PDF documents without requiring any downloads or installations. Some key features of pdf.io include:

  • Viewing, editing, and commenting on PDFs directly in the browser
  • Annotation tools like highlights, text boxes, shapes, freehand drawing
  • Form filling and e-signatures to collect data and signatures digitally
  • Collaboration features to share and discuss PDFs with team members
  • Converting between PDFs and other document formats like Word, Excel, PowerPoint
  • Basic editing like inserting, deleting, or rotating pages
  • Secured storage for your PDF documents in the cloud

As an online app, pdf.io makes it easy to access your PDF tools from anywhere via web browser. It works on all major platforms without requiring software downloads or plug-ins. With strong collaboration features and versatile PDF editing tools, pdf.io is a convenient choice for teams and individuals aiming to streamline their document workflows.

Pdf.io Features

Features

  1. View, edit, annotate, and sign PDFs online
  2. Add text, highlights, shapes, stamps
  3. Fill out and save PDF forms
  4. E-sign documents
  5. Collaborate in real-time
  6. OCR to make PDFs searchable
  7. Password protect PDFs
  8. Redact sensitive info
  9. Compare documents
  10. Convert PDF to Word, Excel, PPT
  11. Create PDFs from files or scanner

Pricing

  • Freemium
  • Subscription-Based

Pros

Easy to use web interface

Good selection of PDF editing tools

Real-time collaboration

Affordable pricing

No software download required

Cons

Limited free plan

Lacks some advanced features like Bates numbering

Mobile apps have fewer features than web


The Best Pdf.io Alternatives

Top Office & Productivity and Pdf Tools and other similar apps like Pdf.io


Adobe Acrobat Reader icon

Adobe Acrobat Reader

Adobe Acrobat Reader is a free software application developed by Adobe Systems for viewing, printing, signing, and annotating Portable Document Format (PDF) files. It is the most popular PDF viewer and one of the most widely used free software downloads with over 2 billion installations across platforms and devices.Acrobat Reader...
Adobe Acrobat Reader image
SumatraPDF icon

SumatraPDF

SumatraPDF is a free and open-source document viewer that supports many file formats. It was originally designed as a replacement for the Windows PDF reader while being much lighter, faster, and more customizable.Some key features of SumatraPDF include:Support for PDF, EPUB, MOBI, CHM, XPS, DjVu, CBZ, CBR file formatsMinimal design...
SumatraPDF image
Okular icon

Okular

Okular is a feature-rich document viewer application designed for the KDE desktop environment on Linux operating systems. It can open and display a wide variety of document formats including PDF, EPUB, PostScript, DjVu, CHM, XPS, ODT, FictionBook, ComicBook, Plucker, and others.Some of the key features of Okular include:Smooth scrolling and...
Okular image
Foxit Reader icon

Foxit Reader

Foxit Reader is a free, fast and lightweight PDF viewer that allows you to view, annotate, sign, and print PDF documents. Developed as an alternative to Adobe Acrobat Reader, Foxit offers the essential PDF features without the large file size and system resource usage of Acrobat.Key features of Foxit Reader...
Foxit Reader image
Xodo icon

Xodo

Xodo is a feature-rich PDF reader and annotator that allows you to view, edit, sign, share and collaborate on PDF documents across devices and platforms. It is offered as a free app for Windows, Linux, Android, iOS and as a web app that works in all major browsers.Some of the...
Xodo image
Evince icon

Evince

Evince is a lightweight document viewer application designed for the GNOME desktop environment. It supports the most common document formats including PDF, PostScript, DjVu and TIFF. Some key features of Evince include:Fast and efficient, optimized for GNOMESmooth scrolling and responsive UIThumbnails and two-page layout for easy browsingAnnotations and form-filling supportMinimalistic...
Evince image
MuPDF icon

MuPDF

MuPDF is an open source software library and set of tools for rendering PDF documents. Developed by Artifex Software, MuPDF is designed to be lightweight, fast, and efficient.As a PDF viewer, MuPDF allows users to quickly open and scroll through PDF files while using minimal system resources. It renders PDF...
MuPDF image
Preview icon

Preview

Preview is the default document viewer and simple image editor software included with macOS. It enables users to quickly view and print various file formats including images, PDFs, webpages, Office documents like Word, Excel, and PowerPoint, as well as media files.Some of the key features of Preview include:Fast previewing of...
Preview image
PDFgear icon

PDFgear

PDFgear is a powerful PDF software suite for Windows that enables users to easily work with PDF documents. It includes a variety of tools for creating, editing, converting, annotating, securing, and optimizing PDFs.Key features of PDFgear include:Intuitive PDF Editor - Add or edit text, images, shapes in PDFs. Redact sensitive...
PDFgear image
Firefox PDF Viewer (PDF.js) icon

Firefox PDF Viewer (PDF.js)

Firefox PDF Viewer (PDF.js) is an open source PDF viewer that is built into Firefox web browser. It was launched in 2012 as part of the Firefox web browser and allows users to view PDF documents directly within the browser, without needing any external PDF viewer plugins.PDF.js uses HTML5canvas and...
Firefox PDF Viewer (PDF.js) image
Qoppa PDF Studio icon

Qoppa PDF Studio

Qoppa PDF Studio is a versatile PDF editing and creation application for Windows. It provides a wide range of tools for working with PDF files.With Qoppa PDF Studio, you can make modifications to existing PDFs, such as adding or editing text, images, links, bookmarks, and form fields. It also allows...
Qoppa PDF Studio image
MJ PDF Reader icon

MJ PDF Reader

MJ PDF Reader is a free PDF viewer for Windows that provides a lightweight yet full-featured alternative to Adobe Acrobat Reader. Developed by Software995, it aims to balance functionality, speed, and ease of use.Some key features of MJ PDF Reader include:Tabbed document interface for opening multiple PDFsFast page loading and...
MJ PDF Reader image
PDF Colorizer icon

PDF Colorizer

PDF Colorizer is a Windows software application used to add color to PDF documents. It provides an easy way for users to customize and enhance the look of their PDF files.The key features of PDF Colorizer include:Colorizing text - users can change font colors to create more visually engaging documentsColorizing...
PDF Colorizer image
OpenViewerFX icon

OpenViewerFX

OpenViewerFX is a free, open-source image viewing and editing software for Windows. It can open and convert between over 50 raster and vector image formats including JPEG, PNG, GIF, BMP, TIFF, RAW formats from various cameras, SVG, PDF and more.As an image viewer, OpenViewerFX provides a clean and intuitive interface...
OpenViewerFX image
Docs PDF/PowerPoint Viewer icon

Docs PDF/PowerPoint Viewer

Docs PDF/PowerPoint Viewer is a free, open-source program for viewing, printing and annotating PDF and PowerPoint documents on Windows, Mac and Linux systems. Developed by a small team of engineers, it focuses on providing a clean, easy-to-use interface for reading PDFs and PPTs without unnecessary bells and whistles.Key features include:Intuitive...
Docs PDF/PowerPoint Viewer image