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Nutrient DWS Accessibility API
What Nutrient DWS Accessibility API is
Nutrient DWS Accessibility API is a cloud API that automatically tags PDF files and checks accessibility conformance. A request with a PDF returns a tagged file with PDF/UA metadata, targeting PDF/UA-1 (ISO 14289-1). Its tagging covers H1–H6 headings, ordered and unordered lists, table rows and cells, reading order, annotations, and decorative artifacts. Nutrient reports 96.5% PDF/UA conformance across a validation corpus of 3,157 files. Any programming language that can make HTTP requests can call the API; quickstarts are available for Java, C#, JavaScript, Python, and PHP. The free plan costs nothing and includes 20 auto-tagged pages and 100 validations per month. Starter costs $79 a month, Professional costs $249 a month, and Business costs $499 a month. Monthly quotas do not roll over, and requests in a category stop when its quota is reached unless the customer moves to a larger plan or pay-as-you-go. All plans include tagging and validation quotas; a validation-only plan is not offered. Auto-tagging does not guarantee full accessibility compliance, so QA remains important, particularly for high-stakes documents.
Who it suits
This API suits developers and organizations that need automated PDF tagging and validation within an HTTP-based workflow. Teams handling legally sensitive or high-stakes documents should plan for additional QA.
What it does well
- Targets PDF/UA-1 conformance
- Detects headings, lists, tables, reading order, and annotations
- Works with any language that can make HTTP requests
- Free plan includes 20 tagged pages monthly
What to know first
- Monthly quotas do not roll over
- Requests stop when a category quota is reached
- No validation-only plan is offered
- Auto-tagging does not guarantee full accessibility compliance
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | 20 auto-tagged pages/month · 100 validations/month | Free |
| Starter | Billed monthly · 200 auto-tagged pages/month · 1,000 validations/month | $79 a month |
| Professional | Billed monthly · 1,000 auto-tagged pages/month · 5,000 validations/month | $249 a month |
| Business | Billed monthly · 3,000 auto-tagged pages/month · 15,000 validations/month | $499 a month |
| Custom | 10,000+ auto-tagged pages/month · unlimited validations · tailored quotas · dedicated support | On request |
As nutrient.io lists them, read 4 Oct 2026. The maker's own page has the final word.
Verdict
The API combines PDF tagging and validation, with language quickstarts and a free monthly allowance. Its quota limits and the need to QA outputs are important considerations for production workflows.
Facts from Nutrient DWS Accessibility API's own pages
- API access
- The API can be called from any programming language that can make HTTP requests, and Nutrient provides quickstarts for Java, C#, JavaScript, Python, and PHP. · nutrient.io, 4 Oct 2026
- Benchmark
- Nutrient reports 96.5% PDF/UA conformance across a 3,157-file validation corpus. · nutrient.io, 4 Oct 2026
- Company
- Nutrient says it serves thousands of organizations in more than 80 countries, including Fortune 500 companies and governments. · nutrient.io, 4 Oct 2026
- Compliance caveat
- Nutrient says auto-tagging reduces manual work but does not guarantee full accessibility compliance, and recommends validating outputs in QA, especially for legally sensitive or high-stakes documents. · nutrient.io, 4 Oct 2026
- Founded
- 2011 · nutrient.io, 28 Sept 2026
- Headquarters
- Vienna, Austria · nutrient.io, 28 Sept 2026
- Output
- The workflow accepts a PDF and returns a tagged PDF with PDF/UA metadata. · nutrient.io, 4 Oct 2026
- Payment security
- Payments are processed by Paddle, and Nutrient says it does not access payment data. · nutrient.io, 4 Oct 2026
- Purpose
- The cloud API automatically tags PDF files and validates accessibility conformance. · nutrient.io, 4 Oct 2026
- Quota behavior
- Monthly page and validation quotas do not roll over, and requests in a quota category are blocked after that quota is reached unless the customer moves to a larger plan or uses pay-as-you-go. · nutrient.io, 4 Oct 2026
- Security
- Nutrient says its infrastructure is SOC 2 Type 2 audited and GDPR-compliant, and API requests must use HTTPS. · nutrient.io, 4 Oct 2026
- Standards
- The API targets PDF/UA-1 (ISO 14289-1) conformance. · nutrient.io, 4 Oct 2026
- Support
- All plans include documentation and developer support, with additional support options depending on plan. · nutrient.io, 4 Oct 2026
- Tagging features
- It detects H1–H6 headings, ordered and unordered lists, table rows and cells, reading order, annotations, and decorative artifacts. · nutrient.io, 4 Oct 2026
- Validation-only
- A validation-only plan is not currently offered; all plans include both auto-tagged pages and validation quotas. · nutrient.io, 4 Oct 2026
Where Nutrient DWS Accessibility API stands on Freedom251
- PDF Accessibility Software#8 of 26