Nutrient DWS Accessibility API
Nutrient DWS Accessibility API automatically tags PDF files and checks their accessibility conformance.
What Nutrient DWS Accessibility API is
Nutrient DWS Accessibility API automatically tags PDF files and checks their accessibility conformance. Send it a PDF and it returns a tagged version with PDF/UA metadata, targeting PDF/UA-1 (ISO 14289-1). Its tagging identifies 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. The API accepts HTTP requests from any programming language, with quickstarts for Java, C#, JavaScript, Python, and PHP. It has a free plan at no cost, which includes 20 auto-tagged pages and 100 validations per month. Monthly page and validation quotas do not roll over, and requests in a category stop once its quota is reached unless you move to a larger plan or pay as you go. All plans include auto-tagged pages and validation quotas; a validation-only plan is not offered. Auto-tagging can reduce manual work, but Nutrient recommends QA because it does not guarantee full accessibility compliance, particularly for legally sensitive or high-stakes documents.
Good
- Returns tagged PDFs with PDF/UA metadata
- Detects headings, lists, tables, and reading order
- HTTP access works with any programming language
- Free plan includes 20 pages and 100 validations monthly
Watch out
- Monthly quotas do not roll over
- Requests stop after a quota is reached
- No validation-only plan is available
- Auto-tagging does not guarantee full compliance
Who it suits
It suits developers and organizations that need PDF tagging and accessibility validation through an HTTP API. The free plan covers limited monthly page and validation quotas; high-stakes documents still need QA.
Verdict
Nutrient DWS Accessibility API combines automatic PDF tagging with validation, and offers a free plan for smaller volumes. Check the monthly quotas and keep QA in the workflow, especially for high-stakes documents.
Plans and prices
From Nutrient DWS Accessibility API's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | 20 auto-tagged pages/month · 100 validations/month |
| Starter | $79 a month | 200 auto-tagged pages/month · 1,000 validations/month · Billed monthly |
| Professional | $249 a month | 1,000 auto-tagged pages/month · 5,000 validations/month · Billed monthly |
| Business | $499 a month | 3,000 auto-tagged pages/month · 15,000 validations/month · Billed monthly |
| Custom | Priced on request | 10,000+ auto-tagged pages/month · unlimited validations · tailored quotas · dedicated support |
The facts
Each one read from Nutrient DWS Accessibility API's own pages, with the date it was checked.
What it does
- 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.checked 4 Oct 2026
- Benchmark
- Nutrient reports 96.5% PDF/UA conformance across a 3,157-file validation corpus.checked 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.checked 4 Oct 2026
- Output
- The workflow accepts a PDF and returns a tagged PDF with PDF/UA metadata.checked 4 Oct 2026
- Payment security
- Payments are processed by Paddle, and Nutrient says it does not access payment data.checked 4 Oct 2026
- Purpose
- The cloud API automatically tags PDF files and validates accessibility conformance.checked 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.checked 4 Oct 2026
- Security
- Nutrient says its infrastructure is SOC 2 Type 2 audited and GDPR-compliant, and API requests must use HTTPS.checked 4 Oct 2026
- Standards
- The API targets PDF/UA-1 (ISO 14289-1) conformance.checked 4 Oct 2026
- Support
- All plans include documentation and developer support, with additional support options depending on plan.checked 4 Oct 2026
- Tagging features
- It detects H1–H6 headings, ordered and unordered lists, table rows and cells, reading order, annotations, and decorative artifacts.checked 4 Oct 2026
- Validation-only
- A validation-only plan is not currently offered; all plans include both auto-tagged pages and validation quotas.checked 4 Oct 2026
The company
- Company
- Nutrient says it serves thousands of organizations in more than 80 countries, including Fortune 500 companies and governments.checked 4 Oct 2026
- Founded
- 2011checked 28 Sep 2026
- Headquarters
- Vienna, Austriachecked 28 Sep 2026
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