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What is PDF9.Ai?

PDF9.Ai is a free, AI-powered PDF platform that integrates 68 different tools into a single browser-based environment. It includes features such as a PDF reader, a robust editing suite, conversion utilities, electronic signature capabilities, and enterprise governance controls. Most of its functionalities function seamlessly in the browser, making sure that files stay on the user's device for security. With the support of nine AI models, users can have conversations about documents, obtain summaries, and translate content into more than 50 languages without incurring extra fees. Key features encompass merging, splitting, compressing, and organizing PDFs, as well as converting files to and from various formats like Word, Excel, PowerPoint, HTML, CAD, and numerous image types; conducting OCR; using PAdES/PKCS#7 digital signatures with comprehensive audit trails; performing intelligent PII redaction; completing U.S. government forms; and comparing different documents. PDF9.Ai is designed to serve a wide range of users, including students, freelancers, legal professionals, accountants, HR teams, and corporations. Collaborative teams can utilize features such as single sign-on (SSO), role-based access control (RBAC), audit logs, and a compliance-oriented infrastructure, while desktop applications are also available for Windows and macOS, thus increasing accessibility and user convenience. This versatility makes PDF9.Ai a valuable tool for anyone needing efficient PDF management and collaboration.

What is BoostPDF?

BoostPDF is an online PDF editor with more than 30 tools in one place. It runs in the browser on Windows, Mac, Linux, Chromebook, phones and tablets, and there is an Android app that adds a document scanner. What it does - Edit the existing text in a PDF, and add text, images, drawings, highlights, stamps, QR codes and barcodes - Sign documents with a drawn signature and fill in forms - Merge, split, rotate, reorder, crop, add and remove pages - Compress PDFs, including to a target size such as under 1 MB - Convert PDF to and from Word, JPG and PNG - OCR scanned PDFs in 19 languages - Permanently redact sensitive text, with optional withholding grounds - AI summaries, translation into 37 languages, quizzes and chat with page references Where your file goes Signing, annotation, form filling, redaction and page tools work in the browser without uploading the file. Compression, conversion, OCR and password protection use BoostPDF's servers, which delete uploads right after processing; result links expire within an hour. AI tools send the document text to an AI provider. Pricing The free plan has daily limits per tool and a 10 MB file limit. BoostPDF Pro is US$6.49 per month or US$62.30 per year, with no daily limits (OCR and AI tools keep fair-use caps) and files up to 100 MB.

Media

Media

Integrations Supported

Claude
Claude Duet
Claude for Legal
Gemini
Google Cloud AI Infrastructure
OpenAI
Stripe
Wasabi

Integrations Supported

API Availability

Has API

API Availability

Pricing Information

$12 per month
PDF9 AI offers a free version with access to core PDF tools. Paid plans are available for additional features.
Free Version

Pricing Information

$6.49/month
Free: daily limits per tool, files up to 10 MB. Pro: US$6.49 per month or US$62.30 per year; no daily limits (OCR and AI tools keep fair-use caps), files up to 100 MB.
Free Version

Supported Platforms

SaaS
Windows
Mac

Supported Platforms

SaaS
Android

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

9 Rank LLC

Date Founded

2025

Company Location

United States

Company Website

pdf9.ai/

Company Facts

Organization Name

BoostPDF

Date Founded

2025

Company Location

New Zealand

Company Website

boostpdf.com

Categories and Features

AI PDF

Not specified

Categories and Features

PDF

Annotations
Convert to PDF
Encryption
Merge / Append
PDF Reader
Watermarking

PDF Compressors

Not specified

PDF Converters

Not specified

PDF Editors

Annotations
Commenting / Notes
Delete Pages
Electronic Signature
Forms Management
Merge / Append
Optical Character Recognition (OCR)
Rearrange Pages
Rotate Pages
Watermarking

PDF Merge

Not specified

PDF Splitters

Not specified

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