Our proven approach to PDF/UA-1 compliance.
We combine heuristic audits, AI-powered remediation, and independent veraPDF validation to deliver PDF/UA-1 conformant output that screen readers actually use and legal teams can verify.
AI-Powered Remediation
Inject a real struct tree with MCID-linked marked content, embed fonts, set metadata, and generate alt text with Claude — automatically, no manual tagging.
Real PDF/UA-1 Structure
Every output ships /StructTreeRoot with /Document, /ParentTree, XMP pdfuaid identifier, and /Scope on TH cells — every fixable ISO 14289-1 clause.
Independent veraPDF Proof
Each file is re-validated by veraPDF — the canonical open-source validator used by Adobe and Foxit. You get a pass/fail verdict you can hand to legal.
Audit it. Fix it. Prove it.
Audit your PDF
We run every page through veraPDF and a heuristic auditor. You see every failed ISO 14289-1 clause and its severity before we touch a byte.
Fix it automatically
We inject a real struct tree with MCID-linked marked content, embed fonts, set metadata, and call Claude to write specific alt text for every image.
Ship with proof
Every output is re-validated by veraPDF before you see it. You get a 106/106 conformance report and a remediated PDF ready to hand to legal.
Deadline
ADA Title II compliance begins April 2026.
Title II of the Americans with Disabilities Act requires state and local government digital content — including public-facing PDFs — to meet WCAG 2.1 Level AA. Large entities must comply by April 24, 2026; small entities by April 26, 2027. Start remediating now — with proof.
AI Image Analysis
Describe every image with AI — not placeholder text.
Claude analyzes each image in your PDF and writes specific, screen-reader-ready alt text. A bar chart gets described as a bar chart — not 'Image 1'. Every description is embedded directly in the /Figure tag's /Alt attribute.
"A bar chart titled 'Quarterly Issue Counts' displaying five bars of varying heights, with the third quarter showing the highest count."
Structural Remediation
Build a real tag tree — not just metadata patches.
We inject marked content with MCIDs into every content stream, build a /StructTreeRoot with /ParentTree, and tag tables as /Table → /TR → /TH|/TD with proper /Scope. Headings are promoted by font size. Every page gets /StructParents. Real structure, not shortcuts.
Compliance Proof
Ship with veraPDF proof — not your own checker.
Every remediated PDF is independently validated against ISO 14289-1 by veraPDF before you see it. 106/106 rules, 2038 checks passed — the same open-source validator Adobe and Foxit use. Hand the report to legal.
How We Stand Out
from Manual Remediation.
Most teams still hand-tag PDFs in Acrobat or hire consultants. Alto delivers PDF/UA-1 compliant output automatically — with proof — in seconds.
Manual / Other Tools
Frequently Asked Questions.
Ready to make your PDFs compliant?
Upload any PDF and get a PDF/UA-1 conformant version in seconds — with an independent veraPDF proof you can hand to legal.