11 Best PDF Checker Tools (2025) [FREE]

PDF Solutions, Software Reviews April 18, 2024

1. Introduction

In the digital age, Portable Document Format (PDF) documents have become a universal standard for sharing information across various platforms. Whether they are reports, eBooks, invoices or forms, such documents need to be accurate, accessible, and compliant with specific standards. This is where PDF Checker tools come into play.

1.1 Importance of PDF Checker tool

PDF Checker tools analyze PDF files for errors and potential issues, discuss their accuracy, accessibility, and compliance with standards such as PDF/A. PDF/A is designed for the long-term storage of electronic documents and ensures that those documents will appear the same way on any device, at any time in the future. The importance of these tools is manifold. They guarantee the PDF’s consistency and legibility for future reference, help in detection and correction of any structural and syntax issues and further ensure the document’s compliance with global accessibility standards. This is essential to make content readable by people with disabilities and complying with legislation like the ADA (American Disabilities Act) and Section 508 in the US, or EN 301 549 in the EU. Such tools hence play a significant role in enhancing the user experience, ensuring optimum accessibility and maintaining document quality and integrity.

1.2 Repair PDF Files

You also need a professional tool to repair PDF files if they are corrupt. DataNumen PDF Repair is widely used:

1.3 Objectives of this Comparison

The primary objective of this comparison is to educate readers about the various PDF Checker tools available and help them choose the right fit for their needs. It aims at presenting an unbiased evaluation of the strengths and weaknesses of each tool, thus aiding in informed decision making. By shining light on the different features, ease of use, pricing, and performance, this comparison aims to save the reader’s time and efforts that would otherwise be spent in trial-and-error. Besides elementary introductions of each tool, it offers a detailed study of their Pros and Cons, backed by firsthand user experiences and expert opinions.

2. PDFEN

PDFEN is a versatile PDF/A validator tool that tests your PDF files for compliance with the PDF/A standard. It’s a simple online tool where users can drag and drop their files for quick validation. Its strength lies in recognizing and validating a PDF/A document’s constituents and structures, making sure that it adheres to the set standards for long-term archiving.

2.1 Pros

User-friendly interface: The drag and drop features make it easy for users of all levels to navigate through the tool.
Quick Performance: The tool is known for its speedy PDF/A validation, making it a time-efficient choice.
High Accuracy: PDFEN is admired for its high accuracy in identifying and resolving potential PDF/A conformity issues.

2.2 Cons

Limited Free Version: Though it offers a free version, some advanced features are exclusively available for premium users only.
Online only: PDFEN is an online tool which might restrict its functionality for users who prefer an offline tool due to internet issues or security concerns.
No Bulk Validation: The tool lacks the batch processing feature, which can be a disadvantage for users dealing with numerous documents.

3. PDF2Go Validate PDF/A

PDF2Go is a robust online PDF/A validator, offering a wide selection of PDF editing and conversion features. It checks the conformity of PDF files to PDF/A standards, which is crucial for long-term archiving. Its easy-to-use interface and the ability to process files directly in the browser, make the tool more accessible and convenient to use.

3.1 Pros

No Installation Needed: Being an online tool, it doesn’t require software installation and can be used from any device with internet connection.
Additional Features: Apart from validation, PDF2Go provides several other features such as PDF conversion, compression, and editing.
High-quality Output: The tool takes care of the quality of the PDF document while processing, ensuring a high-quality result.

3.2 Cons

Internet Dependent: Since it’s an online-based tool, its functionality stands hindered without a digital connection.
Limited File Size: The free version permits a certain file size limit, restricting its usage for larger files.
Listing: Ads and diversions are part of the interface as it’s free, possibly disrupting workflow.

4. AvePDF PDF/A Validation

AvePDF PDF/A Validation is a well-designed online tool that aims at inspecting PDF/A compliance in documents. It’s not just a validator, but a complete toolkit that offers file conversions, compressions, and other PDF management features. Its intuitive interface and support for multiple languages make it a global favorite.

4.1 Pros

Multi-lingual Support: AvePDF is advantageous for non-English speakers, as it provides multiple language support.
Additional Features: It offers an array of useful features beyond PDF/A validation, like file conversions, and electronic signature insertion.
Secure: It ensures data security by automatically deleting uploaded files after a certain duration.

4.2 Cons

Usage Limit: The tool’s free version imposes a limit on the number of usages per hour.
Internet Dependent: As it is an online tool, it can’t function without a stable internet connection.
Pop-up Ads: Some users may find the tool’s pop-up advertisements disruptive.

5. veraPDF

veraPDF is a highly-regarded, open source-based PDF/A Validator, ensuring that PDF files adhere to the PDF/A standard for long-term archiving. It is a comprehensive tool with a wide array of capabilities, including repair of non-compliant PDF files, and validation reports for easy analysis.

5.1 Pros

Open Source: As an open source software, veraPDF is freely accessible and continually updated by the developer community, ensuring continuous development and improvement.
Detailed Reports: Unlike many other validators, it provides detailed reports of issues identified, allowing users to understand about any compliance issues found.
Command Line Interface: For tech-savvy users, it directly functions through command line interface, making batch processing and automation possible.

5.2 Cons

User Interface: The interface might not be user-friendly for non-technical users, especially those who are unaccustomed to command line interface.
Installation Required: Unlike online validators, it’s software that needs to be installed, which might not be convenient for every user.
Learning Curve: Incipient users might find a steep learning curve due to complex advanced features.

6. pdfforge Validate PDF/A

pdfforge is a widely recognized tool for validating PDF/A compliance. Convenient and straightforward, this online tool allows users to upload their PDF files directly from their computer, Dropbox or even Google Drive. Apart from validating, it also provides options for editing, converting, merging, and splitting PDF files.

6.1 Pros

Cloud Integration: The tool integrates with Dropbox and Google Drive, allowing for seamless uploading and saving of files.
Multi-Functional Features: Beyond validation, pdfforge provides an array of PDF management tools which includes editing, splitting, merging, and conversion of documents.
User-friendly: Its simple and intuitive interface makes it highly user-friendly and suitable for both beginners and advanced users.

6.2 Cons

Limitations in Free Version: The free version of pdfforge has notable limitations, including restricted access to advanced features and limited file sizes.
Online Only: Being an online tool, the absence of the internet renders it non-functional.
Ads in Free Version: The tool’s free version includes ads, which can be a distraction for some users.

7. Visual Paradigm PDF/A Validator

Visual Paradigm PDF/A Validator is a proficient tool that validates whether a PDF complies with the PDF/A standard for long-term document archiving. Offering a host of additional functionalities such as PDF editing and conversion, it is a comprehensive on-the-go solution for many PDF-related tasks.

7.1 Pros

Comprehensive tool: It not only validates the PDF/A compliance, but also provides a suite of other document-related tools, offering an all-in-one functionality.
User-friendly Interface: The tool features a simple and modern user interface that is easy to navigate, making it user-friendly for all levels.
Online Convenience: Since it’s a web-based interface, it allows for remote operations without the need for any software installation.

7.2 Cons

Reliance on Internet: Being an online tool, it requires a stable internet connection to operate, limiting its use in areas with poor connectivity.
Limitation on File Size: A certain limitation on file size exists, which might not be adequate for users dealing with huge documents.
Ads: The tool displays occasional advertisements that might disrupt the working experience.

8. DocShifter PDFValidator

DocShifter PDFValidator is a comprehensive solution designed to verify and ensure that your PDFs comply with PDF/A standards. It is built to flawlessly integrate with various content repositories, operational systems, or cloud storage, making it a versatile tool for businesses of all sizes.

8.1 Pros

Integrations: It readily integrates with numerous operational systems and cloud storage providers for smoother workflow.
Scalability: The tool offers great scalability, and is suited to both small businesses and large enterprises.
Advanced features: Includes high-end features like automatic correction of non-compliant documents, adding value to its performance.

8.2 Cons

Complex Setup: The tool might require technical expertise during the initial setup and integration period.
Price: Due to its advanced features and capability, it might be expensive for small businesses or individual users.
Learning Curve: It might have a steeper learning curve due to the advanced and complex functionalities it offers.

9. Validata

Validata is an advanced PDF testing solution designed for businesses of all sizes. It not only validates PDF/A standard compliance but also thoroughly tests the entire structure and contents of your PDFs, providing quality assurance and aspire to be the final word in PDF analysis and compliance auditing.

9.1 Pros

In-depth analysis: Validata offers a thorough analysis of PDFs, including structure, contents, and standard compliance, providing comprehensive insights not seen in other validators.
Automation Features: The tool excels in automating PDF compliance and analysis, freeing your employees for more critical tasks.
Customizable: It provides the ability to customize the tool’s functionality according to the business’s unique needs.

9.2 Cons

High cost: Given its advanced capabilities, the cost of this solution might be relatively higher than other validators.
Complex Interface: Some users report a complex user interface, making it less suitable for casual users or small projects.
Technical Knowledge: To fully utilize Validata’s advanced options and customizations, a good amount of technical knowledge would be required.

10. Xodo Validate PDF/A

Xodo Validate PDF/A is a remarkable and efficient tool to check for a PDF document’s conformity to the PDF/A standard. This tool is a part of the Xodo suite that presents diverse solutions such as PDF reader, annotator, and editor – a productive kit right at your fingertips.

10.1 Pros

Feature-Rich: Apart from validation, the tool offers an array of features including reading, editing, signing, and sharing PDFs.
Cross-Platform Support: Xodo is available across Android, iOS, and Windows platforms, ensuring seamless operation across devices.
Collaboration Feature: Xodo allows users to collaborate and work together on the same PDF at the same time.

10.2 Cons

Interface: The interface might seem overwhelming with a multitude of options and might be complicated for basic users.
Share needs improvement: Some users have reported issues while sharing documents, suggesting there could be some room for improvement in this area.
Ads: The free version of Xodo includes ads, which can be a minor distraction for users.

11. AD Scan

AD Scan, brought to you by AbleDocs, is a competent tool designed to validate the PDF/A standard and broader accessibility aspects of a PDF file. It serves as a complete PDF accessibility and compliance solution, assisting in delivering accessible digital content to everyone.

11.1 Pros

Accessibility Focus: The tool prioritizes accessibility and validates PDF documents for adherence to standards such as PDF/UA (Universal Accessibility).
Intuitive Interface: AD Scan offers a straightforward and user-friendly interface, making it easy to use even for beginners.
Educational Resources: AbleDocs provides a wealth of educational resources and guidance on PDF accessibility and compliance.

11.2 Cons

High Cost: Given its advanced features and the niche area it serves, it might be significantly more expensive than other basic PDF Validator tools.
Specialized Scope: As it focuses heavily on accessibility compliance, it may not be the best choice for users looking for a simple PDF/A validator.
Limited Free Resources: The tool may have limited utility for non-paying users due to restricted access to free resources.

12. 3-Heights PDF Validator Online Tool

3-Heights PDF Validator Online Tool is a specialized instrument designed to validate the compliance of PDFs and PDF/A documents. It provides a fast and comprehensive compliance check and highlights any inconsistencies in the document structure, making it a highly popular choice in the world of PDF validators.

12.1 Pros

Detailed Reports: It stands out for the detail of its compliance reports, helping users to diagnose and fix any discrepancies.
High Accuracy: The tool is widely recognized for its high accuracy in identifying the conformity and structural issues in the PDF file.
Fast Processing: 3-Heights prides itself on quick analysis and validation, enabling users to maintain a high pace in their workflows.

12.2 Cons

Limited Free Use: The tool’s free usage is limited to a certain number of validations per day.
Professional Features: Some of the tool’s more advanced and technical features may be beyond the needs of a casual or infrequent user.
Internet Dependence: As an online validation service, its use depends on the stability and speed of the internet connection.

13. Summary

13.1 Overall Comparison Table

Tool	Features	Ease of Use	Price	Customer Support
PDFEN	PDF/A validation, quick processing	User-friendly interface	Free version available, premium edition requires purchase	Email Support
PDF2Go Validate PDF/A	PDF/A validation, PDF conversion, compression, editing	Intuitive interface	Free with limitations, premium plan available	Email and FAQ page
AvePDF PDF/A Validation	PDF/A validation, file conversions, electronic signature	Easy to use	Free with usage limitations	Email Support
veraPDF	PDF/A validation, detailed reports, command line interface	Technical-oriented interface	Free (Open Source)	Community Support on Github
pdfforge Validate PDF/A	PDF/A validation, PDF management tools	Intuitive interface	Free with limitations, premium plan available	Email and Online Forum
Visual Paradigm PDF/A Validator	PDF/A validation, PDF editing and conversion	User-friendly interface	Free with limitations, premium plan available	Support ticket, Video Guides, FAQs, and Online Forum
DocShifter PDFValidator	PDF/A validation, integration with various systems	Technical-oriented interface	Custom pricing	Email and Live Chat
Validata	PDF/A validation, in-depth analysis, automation	Technical-oriented interface	Custom pricing	Email and Phone Support
Xodo Validate PDF/A	PDF/A validation, reading, editing, signing, sharing PDFs	User-friendly interface	Free with advertisements	Email
AD Scan	PDF/A validation, accessibility compliance	User-friendly interface	Custom pricing	Email, Phone and Live Chat
3-HEIGHTS PDF VALIDATOR ONLINE TOOL	PDF/A validation, comprehensive compliance checks	User-friendly interface	Free for certain validations per day	Email and Phone Support

13.2 Recommended Tool Based on Various Needs

If cost-effectiveness is a priority, PDFEN and PDF2Go offer a significant range of features in their free versions. For detailed compliance reports and technical robustness, veraPDF and Validata stand out. For in-depth accessibility themes, AD Scan is the top recommendation. Finally, for multifunctionality and user-friendly experience, pdfforge and Xodo provide one-stop solutions for PDF management along with validation.

14. Conclusion

14.1 Final Thoughts and Takeaways for Choosing a PDF Checker Tool

When choosing a PDF Checker Tool, it’s essential to understand the specific requirements and constraints of your task. If keeping costs low is crucial, consider a tool offering a substantial feature range in a free version such as PDFEN or PDF2Go. For high-quality, detailed compliance reports, veraPDF and Validata may be preferable, though they may be more technologically complex. If accessibility checking is a concern, AD Scan is worth considering.

Moreover, it is also worth checking into each tool’s support and customer service resources. Tools like DocShifter and AbleDocs’ ADScan offer multiple support channels, which can be a crucial factor in timely problem resolution.

Ultimately, the decision should hinge on understanding your specific needs and what features are most supportive of those needs within your budget constraints. This comparison provides a launching pad for you to explore, trial, and choose the most fitting solution for your PDF validation needs.

Author Introduction:

Vera Chen is a data recovery expert in DataNumen, which provides a wide range of products, including a good tool to recover OST files.