Local AI Plugin for PDF Processing in .NET

Free plugin for Spire.PDF for .NET

Local AI Plugin for
PDF Processing in .NET

Extend Spire.PDF for .NET with local AI capabilities to translate, redact, summarize, and review PDF documents. Process sensitive files with a ready-to-use AI model that runs entirely in your own environment— without relying on cloud AI services.

Explore the Plugin See how it works

100% local & private Runs entirely on your own machine — nothing is uploaded.

Ready out of the box A ready-made model is built in — just install and start processing.

Light on hardware Runs on an ordinary CPU — no high-end hardware required.

◈ Optional plugin download • Works with commercial & free Spire.PDF for .NET
components • Used through API calls from your .NET code

See Spire.Office.EdgeAI.PDF in Action

Explore PDF translation, redaction, summarization, and compliance review through
input-to-output workflow examples.

Share a Project Report with an International Team

A project report needs to be shared with English-speaking colleagues,
but the original document is written in another language.

C# API Example

var pdf = new PdfDocument();
pdf.LoadFromFile("input.pdf");
await pdf.TranslateAsync(TranslateLanguage.English);
pdf.SaveToFile("output.pdf");

Input: English .pdf

Output: multiple languages

More Than Passing PDF Text to an AI Model

PDF documents contain more than text. Page layouts, formatting, and content
positioning also matter when making changes. Spire.Office.EdgeAI.PDF combines local AI capabilities with
Spire.PDF for .NET to support processing within existing PDF workflows.

Process PDF Page
Content

Work with text within PDF pages instead of treating the entire file as plain text alone.

Preserve Layout and Formatting

Help maintain the original structure and visual layout when translating or modifying PDF content.

Integrate with Existing PDF Operations

Use AI features alongside Spire.PDF for .NET document loading, editing, and saving operations.

How Spire.Office.EdgeAI.PDF
works in Spire.PDF for .NET

One plugin connects your .NET code to a ready-to-use local AI model and adds AI document
processing to the Spire components you already use — a ready-made model built in, no cloud, no GPU.

Your environment

Your .NET app

Spire.PDF loads and manages the PDF document, ready for AI-powered processing.

Local AI plugin

Add the plugin to your .NET project to enable AI-powered PDF processing.

Local AI model

Process PDF documents locally on a standard CPU—no cloud services or dedicated GPU required.

100% local private AI • Ready-made model built in • Runs on a standard CPU
• Nothing leaves your machine

AI Features Built for
PDF Workflows

Each one runs locally, inside the
Spire component that already holds your file.

Translate PDFs into
Other Languages

Translate PDF text into other languages while maintaining the existing document structure as far as possible.

Mask Sensitive
Information

Mask sensitive details, such as phone numbers and email addresses, by replacing selected characters with asterisks before sharing PDF documents.

Extract Key
Information

Extract details such as contract parties, payment amounts, and listed items from PDF documents without manually searching through every page.

Review PDFs for
Compliance

Review PDF documents against custom compliance rules to identify potential issues and content that may need further attention.

And more: text expansion and simplification for PDF, topic-based document generation for PDF. New features are added continuously.

100% local private AI for documents
that stay inside your network.

Contracts, financial records and internal reports are among the most sensitive files a business holds —
so everything is processed on your own machine, with nothing sent outside.

100% Local, No Upload

The model runs on your own machine or server. Document
content is never sent to an outside AI service.

Ready-made model, runs on CPU

The plugin ships with a ready-to-use model and runs
well on a standard CPU — no high-end hardware needed.

Built for strict environments

Fits enterprise document work with tight information security
rules, where files cannot leave the internal environment.

Cloud AI service

Local AI plugin

Where the file
is processed

On a provider's
servers

On your own
machine or server

What leaves
your network

Your document
content

Nothing —
no upload at all

Who can see
the content

Depends on the
provider's terms

Only you —
100% local

What you need
to run it

Cloud subscription
& GPU
infrastructure

A standard CPU is
enough —
no high-end
hardware needed

Add EdgeAI to
Your Existing PDF Toolkit

Spire.Office.EdgeAI.PDF adds local AI functionality to applications
built with Spire.PDF for .NET. It is an extension of the PDF library,
not a standalone PDF processing tool.

No separate plugin license purchase

The local AI add-on is available without buying an additional EdgeAI license.

Spire.PDF library dependency

Add Spire.PDF for .NET to your .NET application to use the EdgeAI plugin.

C# example: Translate a PDF

using Spire.Office.EdgeAI;
using Spire.Office.EdgeAI.Pdf;
using Spire.Pdf;

var pdf = new PdfDocument();
pdf.LoadFromFile("input.pdf");
await pdf.TranslateAsync(TranslateLanguage.English);
pdf.SaveToFile("output.pdf");