Software Alternatives, Accelerators & Startups

Sejda VS PDFluent SDK

Compare Sejda VS PDFluent SDK and see what are their differences

Sejda logo Sejda

Split, merge and other powerful PDF tools.

PDFluent SDK logo PDFluent SDK

Pure Rust PDF SDK โ€“ zero C deps, 2.5MB brotli WASM, tested on 50k PDFs.
  • Sejda Landing page
    Landing page //
    2023-04-25
  • PDFluent SDK Landing page
    Landing page //
    2026-08-28

PDFluent is a PDF SDK built on a pure Rust core (48 crates, zero C or C++ dependencies). This means no native library to link and a single dependency to vendor. The Rust core is reached from Python, .NET, Java and Node.js through native bindings, and is compiled to WebAssembly for the browser (2.5 MB brotli-compressed over the wire).

You can integrate PDFluent from Rust, Python, .NET, Java, and Node.js, with packages published on crates.io, PyPI, NuGet, Maven Central, and npm. The SDK covers the full spectrum of PDF operations:

  • Rendering, text and image extraction
  • AcroForm forms and PAdES digital signatures
  • PDF/A conversion and validation, redaction, OCR
  • Document manipulation: merge, split, watermark, compress
  • XFA form rendering and flattening (experimental)

PDFluent has been tested on 50,000 real PDFs with zero crashes. In a rendering fidelity benchmark of 5,000 PDFs, 94% achieved SSIM 0.95 or better against the reference renderer mutool.

Run the SDK with no licence key at all and you get every feature plus a Producer watermark on output. Take the 30-day evaluation, no credit card required, and the watermark is gone for those 30 days. Buy a perpetual licence (paid once from EUR 699 โ€“ no subscription) and it stays gone.

A companion desktop editor for macOS and Windows is free for everyone, including commercial use. It runs entirely on the device, requires no account, and sends no telemetry. The company behind PDFluent is Innovation Trigger B.V., based in the Netherlands.

PDFluent SDK

$ Details
freemium โ‚ฌ699 / One-off (Start free for 30 days โ€” full SDK, no watermarks)
Platforms
Linux MacOS Windows Web Browser Online
Startup details
Country
Netherlands
Employees
1 - 9

Sejda features and specs

  • User-Friendly Interface
    Sejda features an intuitive and easy-to-navigate interface, making it accessible for users with varying levels of tech-savviness.
  • Wide Range of PDF Tools
    Sejda offers a comprehensive set of tools for editing, merging, splitting, compressing, and converting PDFs, catering to diverse user needs.
  • Cloud Integration
    Sejda allows users to import and export files directly from popular cloud storage services like Google Drive, Dropbox, and OneDrive, enhancing workflow efficiency.
  • Security Features
    The platform provides options for adding passwords and encryption to PDFs, ensuring that sensitive information remains secure.
  • Free Usage Tier
    Sejda offers a free version that allows users to perform basic PDF tasks without any cost, making it accessible to budget-conscious individuals and small businesses.

Possible disadvantages of Sejda

  • Limited Free Version
    The free plan comes with limitations such as a cap on the number of tasks performed per day and restrictions on the size of files that can be processed, which may not be sufficient for heavy users.
  • Subscription Cost
    The premium plans, while offering more features, can be relatively costly, which might be a concern for individual users or small businesses.
  • Internet Dependency
    As an online tool, Sejda requires a stable internet connection for optimal performance, which might be a limitation in areas with poor connectivity.
  • Limited Advanced Features
    While Sejda covers a wide range of basic to intermediate PDF functionalities, it may lack some advanced features that professional users might require, such as advanced form filling and data extraction.
  • Performance on Large Files
    Users may experience slower performance or occasional glitches when working with very large files, which could disrupt the user experience during critical tasks.

PDFluent SDK features and specs

  • Engine
    Pure Rust core, 48 crates, no C or C++ dependencies
  • Language surfaces
    Rust, Python, .NET, Java, Node.js, WebAssembly
  • Distribution
    crates.io, PyPI, npm, NuGet, Maven Central
  • WebAssembly build
    2.5MB brotli-compressed, runs in the browser
  • Licence
    Perpetual, paid once from EUR 699, no subscription
  • Evaluation
    30 days, no credit card required
  • Unlicensed output marking
    Adds Producer watermark to output, all features enabled
  • Stability test
    Zero crashes on 50,000 real PDFs
  • Rendering quality
    94% of 5,000 PDFs at SSIM 0.95+ vs mutool
  • Document operations
    Rendering, text and image extraction, forms, redaction, OCR, merge, split, watermark, compress
  • Standards & compliance
    PAdES digital signatures, PDF/A conversion and validation
  • XFA support
    Renders and flattens legacy XFA forms, experimental
  • Desktop editor
    Free for macOS and Windows, commercial use, runs entirely on device

Analysis of Sejda

Overall verdict

  • Yes, Sejda is generally considered a good tool for PDF editing.

Why this product is good

  • User-Friendly Interface: Sejda offers an intuitive interface that is easy to navigate, making it accessible for users of all experience levels.
  • Comprehensive Features: It includes various features such as PDF editing, merging, splitting, compressing, converting, and protecting with passwords.
  • Cross-Platform Support: Sejda is available online and has desktop versions for both Windows and macOS, allowing flexibility in how you access its tools.
  • Free and Paid Options: Sejda offers a helpful free tier that allows users to perform tasks without a subscription, while the paid version unlocks additional features and removes usage limitations.
  • Fast and Efficient: Users often report that tasks are completed quickly and with minimal hassle.

Recommended for

  • Individuals who need to perform occasional PDF edits without installing heavy software.
  • Small businesses looking for an affordable PDF management solution.
  • Students who need a tool for editing and organizing academic materials.
  • Professionals requiring an efficient tool for document workflow.

Sejda videos

Sejda PDF Editor Tutorial

More videos:

  • Review - Sejda Free PDF Tools~My Pick Of The Week & Free Shout Out

PDFluent SDK videos

No PDFluent SDK videos yet. You could help us improve this page by suggesting one.

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Category Popularity

0-100% (relative to Sejda and PDFluent SDK)
PDF Tools
99 99%
1% 1
HTML To PDF
0 0%
100% 100
PDF Editor
100 100%
0% 0
PDF Conversion API
0 0%
100% 100

Questions & Answers

As answered by people managing Sejda and PDFluent SDK.

How would you describe the primary audience of your product?

PDFluent SDK's answer:

This fits developers who need to process real-world PDFs that include XFA forms - often from government or banking sources - and want a single SDK that works consistently across Python, Node.js, Java, C, Rust, and WebAssembly without managing native binaries for each platform.

What makes your product unique?

PDFluent SDK's answer:

PDFluent SDK parses XFA, a 1,000-page specification that almost every modern PDF library ignores. It evaluates FormCalc scripts and flattens XFA forms to standard PDF, validated against an internal corpus of 1,150 enterprise documents including US, Canadian, IRS, GSA, and VA government forms plus banking documents. XFA support is experimental and has no published fidelity claim.

Why should a person choose your product over its competitors?

PDFluent SDK's answer:

Because the SDK is pure Rust with no C or C++ dependencies, there is no FFI boundary inside the engine, no C++ exceptions to catch, and no platform binary to ship per OS. This eliminates the deployment complexity of dragging in a full PDFium build.

What's the story behind your product?

PDFluent SDK's answer:

The team got tired of PDF libraries that crashed on real-world documents, ignored XFA entirely, or shipped 80 MB of C++ just to read a form field. They started building a parser in Rust from scratch, then added an XFA engine, a renderer, and a PDF/A converter. The company is Innovation Trigger B.V., based in the Netherlands.

Which are the primary technologies used for building your product?

PDFluent SDK's answer:

PDFluent is built in pure Rust with no C or C++ dependencies. It provides bindings via PyO3 for Python, napi-rs for Node.js, JNI for Java, a cdylib header for C, native Rust, and WebAssembly (2.5 MB brotli-compressed). The same engine runs across all surfaces.

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Sejda and PDFluent SDK

Sejda Reviews

The 13 Best Free PDF Editors (February 2024)
Sejda PDF Editor is one of the very few PDF editors that actually lets you edit pre-existing text in the PDF without adding a watermark. Most editors only let you change the text you add yourself, or they support text editing but then throw watermarks all over the place.
8 Best Adobe Acrobat Alternatives In 2022 [Updated List]
Answer: You can use Sejda to convert a PDF to Word without Adobe. On Sejda, you can convert documents of any file format to another in a few clicks easily.
Top 6 best free pdf editors
Sejda provides online services and desktop editors, capable of operating dozens of functions, such as: editing, form creation and modification, Bates, encryption and decryption, etc. But it has a daily limit for non-subscribers.
30 Best Adobe Acrobat Alternatives in 2020
Sejda PDF Editor is a free online PDF tool. It also provides direct links to open PDF documents with the editor. You can also use this editor to fill and sign PDF. The editor is alternative to other PDF creating and editing software such as Adobe acrobat. Use this software to compress PDF files.
Source: www.guru99.com
15 PDF editors quick review
An online service with basic PDF editing functionality and a desktop app. Sejda is obviously different from Adobe Acrobat and other popular PDF editors similar to it, which might be somewhat startling at the beginning. Sejda does not allow you to scan documents or create docs from other files. Though, if all you need is to make some slight amendments to a PDF file, it is...

PDFluent SDK Reviews

We have no reviews of PDFluent SDK yet.
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Social recommendations and mentions

Based on our record, Sejda seems to be more popular. It has been mentiond 6 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Sejda mentions (6)

View more

PDFluent SDK mentions (0)

We have not tracked any mentions of PDFluent SDK yet. Tracking of PDFluent SDK recommendations started around Aug 2026.

What are some alternatives?

When comparing Sejda and PDFluent SDK, you can also consider the following products

iLovePDF - Premium online PDF tool set

Apryse - Integrate document processing capabilities into any software applications. Generate, convert, view, edit, and sign pdf and documents easily.

Smallpdf - PDF document management and conversion suite

Adobe - Creativity doesnโ€™t just open doors.

Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.

PSPDFKit - PSPDFKit is the best framework for working with PDF files. Our SDK provides first-rate PDF solutions for your application with features like annotating, signing, and form filling. We power successful projects for businesses across the globe.