Choosing the best XBRL software for ESEF and CSRD reporting depends on your organisation’s size, technical capability, and the scope of your regulatory obligations. This article compares five certified XBRL tools — CFOUR Comply, CoreFiling, Workiva, Altova, and Lucanet — across criteria including CSRD digital tagging support, taxonomy coverage, team collaboration, and ease of use. CFOUR Comply is best suited to mid-sized organisations wanting a fast-to-deploy, user-friendly platform for both ESEF and CSRD. CoreFiling and Workiva suit larger enterprises with complex multi-framework requirements. Altova addresses organisations with diverse taxonomy needs including Solvency II and CRD IV. Lucanet is tailored to large enterprises with ERP integration requirements. All five hold XBRL International certification.When it comes to financial and sustainability reporting, XBRL software is an essential tool for organisations to meet compliance requirements under ESEF (European Single Electronic Format) and CSRD (Corporate Sustainability Reporting Directive). These tools automate the process of tagging and validating reports, reducing errors and ensuring deadlines are met.
This article compares the five leading XBRL software solutions for ESEF and CSRD reporting. For a broader framework on evaluating iXBRL tools, see our guide on how to choose iXBRL software.
When it comes to financial and sustainability reporting, the best XBRL software for ESEF and CSRD compliance automates tagging and validation, reducing errors and ensuring deadlines are met. For organisations subject to ESEF and CSRD reporting obligations, the right XBRL software automates tagging and validation, reducing errors and ensuring submissions meet regulatory deadlines.
ESEF and CSRD require structured digital reporting using iXBRL format.
The CFOUR team has been supporting organisations with ESEF reporting for more than three years and provides a solution for CSRD for companies in scope. The platform is certified by XBRL International, which confirms conformance with XBRL specifications. This guide reviews available solutions and the criteria to consider when selecting one.
We draw on first-hand experience and trusted sources to identify the best XBRL software options, covering the shift to Inline XBRL and the reporting requirements under CSRD.
What is XBRL and Why XBRL Software is Essential for Reporting?
XBRL software allows organisations to tag, validate, and submit structured data in compliance with ESEF and CSRD requirements. It replaces manual processes, ensuring financial and sustainability reports meet standards for accuracy and transparency.
Understanding ESEF and CSRD
- ESEF. Mandated by the European Union, ESEF requires listed companies to submit annual financial reports in iXBRL format to ensure consistency across member states. See guidance from the European Securities and Markets Authority (ESMA)” .
- ESMA published the ESEF Taxonomy 2025 on 21 April 2026, incorporating IFRS 18 entry points. Issuers should prepare FY2026 reports using the 2025 taxonomy.
- CSRD. Expanding on sustainability reporting, CSRD requires detailed ESG disclosures aligned with the European Sustainability Reporting Standards (ESRS), using the CSRD taxonomy for structured data submission. Read the CSRD legislative proposal for more details. Omnibus I (Directive (EU) 2026/470, published 26 February 2026, in force 18 March 2026 significantly narrowed CSRD scope: only companies with more than 1,000 employees and more than €450m turnover are now required to report (reduced from the previous 250-employee threshold). Wave 1 companies (those that began reporting in 2024) may skip CSRD filings in 2025–2026 under a transition exemption. Companies below the new threshold may follow the voluntary VSME standard.
Inline XBRL (iXBRL): The Current Standard
While “XBRL software” is still the commonly used term, most regulatory submissions now use Inline XBRL (iXBRL). This format integrates machine-readable XBRL tags into a human-readable HTML document, making reports accessible to both software and people. Regulators including ESMA mandate iXBRL for ESEF submissions. All five tools reviewed here support iXBRL.
CSRD Digital Tagging and Reporting Requirements
CSRD requires organisations to provide ESG disclosures aligned with the ESRS taxonomy for CSRD digital tagging. Under the Omnibus I simplification (effective March 2026), CSRD now applies to companies with more than 1,000 employees and more than €450m in turnover. Companies below this threshold may follow the voluntary SME standard (VSME). For in-scope companies, XBRL software automates the CSRD data tagging process, aligning ESG disclosures with the CSRD taxonomy while reducing manual error risk.
Key Challenges in Reporting and How XBRL Software Solves Them
1. Manual Errors and Validation Issues
Manual tagging is time-consuming and prone to mistakes, which can lead to submission rejections or regulatory queries. XBRL software automates this process, ensuring accurate and compliant reports.
2. Increased Reporting Complexity
CSRD introduces more complex taxonomies for ESG data. XBRL solutions address this with automated CSRD data tagging and built-in validation.
3. Meeting Tight Deadlines
Submission periods are high-pressure. A key advantage of XBRL tools is the ability to begin tagging on draft versions of reports before they are finalised. This allows teams to address potential tagging issues in advance, so that by the time the report is complete, most of the compliance work is done.
How to Choose the Best XBRL Software?
Look first for software that provides comprehensive support for the specific reporting frameworks you need, whether that is ESEF, CSRD report tagging, or both. Key criteria include:
- Taxonomy support. Confirm coverage of the frameworks required, including the ESEF 2025 taxonomy and the ESRS CSRD taxonomy.
- Ease of use. An interface accessible to non-technical finance teams reduces onboarding time and error rate.
- Automated tagging. Software with AI-assisted tag suggestions reduces manual effort.
- XBRL International certification. XBRL Certified Software™ has been independently reviewed to meet XBRL specifications, ensuring interoperability across certified tools.
- Team collaboration. Role-based access and multi-user workflows allow preparers, reviewers, and auditors to work on the same report simultaneously.
For further detail on evaluation methodology, see our guide on how to choose iXBRL software and ESMA’s ESEF guidelines.
Top 5 XBRL Software Solutions for ESEF and CSRD Reporting
1. CFOUR Comply
CFOUR Comply is certified by XBRL. Reporting frameworks supported: ESEF, UKESEF, CSRD.
Features:
- Automated iXBRL tagging powered by AI
- Roll-forward tags from previous years into new reports
- Validation tools for financial and CSRD reports
- Accessible interface designed for non-technical users
Strengths:
- User-friendly interface with flexible configuration
- Scalable across entity counts
- Short implementation time
Best for mid-sized organisations needing a robust, scalable solution for ESEF or CSRD reporting.
2. CoreFiling
Corefiling also has XBRL Certification. The software supports: ESEF, CSRD, UKSEF, UK iXBRL, SA CIPC, SASB iXBRL, CRD IV, Solvency II, national regulations, CbCR.
Features:
- Support for a broad range of XBRL frameworks
- High-quality validation tools
- Flexible options for custom taxonomies
Strengths:
- Suited for global organisations with diverse compliance obligations
- Multi-jurisdictional framework coverage
Best for enterprises managing multi-jurisdictional or complex reporting frameworks.
CoreFiling’s official page: https://www.corefiling.com/.
3. Workiva
Workviva is XBRL-certified software. It works for the following frameworks: ESEF/UKESEF and CSRD.
Features:
- ESEF and CSRD reporting support
- Source system integration
- Data lineage tracking from source to final report
- Validation tools
Strengths:
- Unlimited user seats
- Comprehensive collaboration and tracking
Best for mid-sized to enterprise organisations requiring unlimited platform access and detailed audit trail functionality. Workviva’s official page: https://www.workiva.com/solutions/esef-annual-reporting
4. Altova
XBRL-certified software. Supports reporting frameworks: ESEF/UKESEF, CSRD, IFRS, Solvency II, CRD IV.
Features:
- Multi-platform compatibility (Windows, Mac, Linux)
- Flexible mapping tools for converting legacy data formats to XBRL
- Integrated validation and advanced error checking
- Customisable templates for tagging and visualisation
Strengths:
- Broad taxonomy coverage across multiple regulatory frameworks
- Versatile platform compatibility
- Competitive pricing
Best for organisations with diverse reporting requirements or those requiring Solvency II and CRD IV coverage alongside ESEF and CSRD. Altova’s official page: https://www.altova.com/.
5. Lucanet (Amana)
XBRL-certified software. Supported reporting frameworks: ESEF/UKESEF and CSRD.
Features:
- Certified XBRL engine supporting current and historical taxonomies
- Comprehensive audit trail and custom validation rules
- Advanced data import options (SAP BW, SimCorp Dimension, Excel)
- Multi-user workflow support
Strengths:
- Robust validation and customisation for complex taxonomies
- Extensive ERP import/export flexibility
Best for large enterprises with complex taxonomy requirements and multi-system reporting workflows.
Official website of Lucanet: https://www.lucanet.com/.
Closing Thoughts on XBRL Software
As reporting requirements evolve, XBRL software has become a practical necessity for organisations subject to ESEF and CSRD obligations. Tools built to support iXBRL ensure accuracy, consistency, and transparency in both financial and sustainability reporting. The right choice depends on your organisation’s size, technical profile, and regulatory scope, but all five options reviewed here carry XBRL International certification and provide the features needed for compliant filings. For companies also subject to Dutch SBR requirements, see our comparison of SBR software for KVK filing .
To see how CFOUR Comply supports ESEF and CSRD reporting in practice, request a demo or watch a demo.
FAQs about XBRL software
- What is XBRL software?
XBRL (Extensible Business Reporting Language) software is a tool used to prepare, validate, and file financial and sustainability reports in structured format. It automates the tagging of financial and ESG data, ensuring reports comply with regulations such as ESEF and CSRD. Most modern tools produce iXBRL output, which is both machine-readable and human-readable.
- How do you open an XBRL file?
Opening an XBRL file requires dedicated XBRL software. Standard applications such as Excel cannot handle XBRL’s tagging and validation structure. Certified XBRL tools and platforms designed for ESEF or CSRD reporting allow you to view, validate, and edit the tagged content in a compliant environment.
- Is XBRL software free?
XBRL itself is an open standard, but the software required to generate, tag, and validate XBRL reports is not typically free. Most solutions are sold on a subscription or licence basis, with pricing based on features, user count, and reporting volume.
- How much does XBRL software cost?
Cost varies by provider and scope. Entry-level solutions may start from a few hundred euros per month for small reporting entities, while enterprise platforms with ERP integration, unlimited users, or multi-jurisdiction support cost substantially more annually. Contact vendors directly for pricing based on your entity count and filing volume.
- Is XBRL still used?
Yes. Most regulatory frameworks now specify Inline XBRL (iXBRL) as the required format. iXBRL integrates XBRL tags directly into an HTML document, making reports accessible to both people and automated processing systems. It is the mandated format for ESEF and the expected format for CSRD digital tagging.
- What is the difference between XBRL and iXBRL?
XBRL produces a machine-readable data file only. iXBRL embeds the same structured tags into a human-readable HTML document. Most regulators now require iXBRL because it eliminates the need to produce a separate document for humans and a separate data file for machines.
- How do XBRL taxonomies work?
A taxonomy is a structured dictionary that defines and standardises financial and ESG concepts. The ESEF taxonomy (currently ESEF 2025, published April 2026) defines the financial concepts that listed companies must tag in their IFRS annual reports. The CSRD/ESRS taxonomy defines the sustainability disclosure concepts required for CSRD report tagging. Software maps your report’s line items to these taxonomy concepts, producing a validated, regulatorily compliant output.
