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Conformance

Standards you can verify

For every standard NextPDF targets, here is the edition, a reader-runnable check, and its precise scope. Generate a file in the free trial and run the named validator on your own machine.

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Validator matrix

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Six standards. Six commands. Each result carries its scope.

  • PDF 2.0

    ISO 32000-2:2020
    Core

    Documents built on the PDF 2.0 object model with valid file structure and cross-reference data.

    Verify it yourself
    qpdf --check invoice.pdfParses the file and reports structural and stream-encoding check results.
    Evidence today
    Download a sample →
    Engine nextpdf/core@d5311d799Generated 2026-08-17SHA-256 2df276fe0644c466f683fde3aee2c382e6270dbe17db7849e9b8708e6bbfef55Audit tools/pdf-audit@site-e3fab9f (G1-G4 geometry, T1-T2 text fidelity, F1 font embedding, S1-S2 structure, SSIM visual regression)
    Spec reference
    ISO 32000-2 §7.5 (file structure — cross-reference table / streams)

    ScopeConfirms structural validity. A specific conformance profile (PDF/A, PDF/UA) is a separate check, below.

  • Tagged accessibility (PDF/UA-2)

    ISO 14289-2:2024
    CoreRegulated

    Tagged real content in the logical structure tree, with figure alternative text and a document language, carries meaning with the rendered content.

    Verify it yourself
    verapdf --flavour ua2 accessible-report.pdfChecks the file against the PDF/UA-2 profile and lists each rule result.
    Evidence today
    Download the tagged sample →
    Engine nextpdf/core@d5311d799Generated 2026-08-17SHA-256 3bf9149f498c7b260e3724b48b6c230b4d50d0908e749425809cd68076583ef1Audit tools/pdf-audit@site-e3fab9f (G1-G4 geometry, T1-T2 text fidelity, F1 font embedding, S1-S2 structure, SSIM visual regression)
    Spec reference
    ISO 14289-2 (PDF/UA-2); real content tagged in reading order; Alt + Lang carried per ISO 32000-2 §14.7–14.8

    ScopeThe sample exposes its structure tree, document language, heading hierarchy, figure alternative text, and artifact-marked furniture. veraPDF determines the file-level profile result.

  • Archival (PDF/A-4)

    ISO 19005-4:2020
    EnterpriseRegulated

    Archival output with a PDF/A OutputIntent + embedded ICC profile, the pdfaid identification schema, and embedded fonts.

    Verify it yourself
    verapdf --flavour 4 archival.pdfValidates against the PDF/A-4 rule set and lists the result for every evaluated clause.
    Evidence today
    Download the archival sample →
    Engine nextpdf/core@d5311d799Generated 2026-08-17SHA-256 a07b4fc7bab32ef4315ca3299df31a9310dca95fc3e00c5e10c7796dbc855f2eAudit tools/pdf-audit@site-e3fab9f (G1-G4 geometry, T1-T2 text fidelity, F1 font embedding, S1-S2 structure, SSIM visual regression)
    Spec reference
    ISO 19005-4 §6.2.3 (OutputIntent); §6.7.3 (pdfaid identification); §6.2.10 (fonts)

    ScopeA passing validator confirms the file conforms; long-term archival suitability also depends on your inputs.

  • Print production (PDF/X-4)

    ISO 15930-7
    Pro

    A PDF/X-4 output configuration on PDF 1.6 with a GTS_PDFX output intent and an embedded Coated FOGRA39 CMYK ICC v2 profile.

    Verify it yourself
    python -m pdf_audit audit print-ready.pdf --spec print-ready.json --rule ST6Checks the declared GTS_PDFX output intent and the embedded ICC v2 profile structure.
    Evidence today
    Download the print sample →
    Engine nextpdf/core@d5311d799Generated 2026-08-17SHA-256 0f5ba1eb66d6cfe9bf7af9f635876ffc216277a811aff1f087d88ea586041804Audit tools/pdf-audit@site-e3fab9f (G1-G4 geometry, T1-T2 text fidelity, F1 font embedding, S1-S2 structure, SSIM visual regression)
    Spec reference
    ISO 15930-7 (PDF/X-4 target; PDF 1.6 exchange)

    ScopeThe sample records the selected output configuration and measured output-intent structure. A PDF/X preflight validator determines the complete file-level result.

  • Digital signatures (PAdES)

    ETSI EN 319 142-1
    Core → EnterpriseRegulated

    PAdES B-B and B-T signatures in Core and Pro, with B-LT / B-LTA long-term and archival workflows in Enterprise.

    Verify it yourself
    pdfsig signed-agreement.pdfReports signature validity, certificate-chain validation, and available revocation data using the local trust configuration.
    Evidence today
    Download a signed sample →
    Engine nextpdf/core@d5311d799Generated 2026-08-17SHA-256 a03f07dfed357512a360d7e7da193a5b628ceaa26090cb17d85c12088ad7aefeAudit tools/pdf-audit@site-e3fab9f (G1-G4 geometry, T1-T2 text fidelity, F1 font embedding, S1-S2 structure, SSIM visual regression)
    Spec reference
    ETSI EN 319 142-1 clause 6 (§6.1 levels; Table 1); ISO 32000-2 §12.8 (signatures), §12.8.4.3 (DSS)

    ScopeThe published AATL PAdES B-LTA chain includes the document-signing certificate, RFC 3161 timestamps, and DSS validation material. EU DSS 6.4 validated the published set as PAdES-BASELINE-LTA.

  • E-invoicing (ZUGFeRD / Factur-X)

    EN 16931-1
    EnterpriseRegulated

    A hybrid invoice: the readable PDF plus an embedded structured XML targeting the EN 16931 core invoice model, in a PDF/A-3 container.

    Verify it yourself
    pdfdetach -saveall e-invoice.pdfExtracts the embedded XML (poppler-utils); validate it against the EN 16931 schematron, or submit to your buyer / tax-authority portal — the recipient’s validator is the real test.
    Evidence today
    Download the e-invoice sample →
    Engine nextpdf/core@d5311d799Generated 2026-08-17SHA-256 1b693d0a51d20bb1249b06ff63f8473810c5894e8adc3db9193518dacb219697Audit tools/pdf-audit@site-e3fab9f (G1-G4 geometry, T1-T2 text fidelity, F1 font embedding, S1-S2 structure, SSIM visual regression)
    Spec reference
    EN 16931-1 §7 (core invoice semantic data model)

    ScopeNextPDF builds output that targets the model; acceptance is determined by the recipient’s validator and the correctness of your data.

  • AES-256 encryption

    ISO 32000-2 §7.6
    Core

    AES-256 (AESV3, R6 security handler) encryption of strings and streams.

    Verify it yourself
    qpdf --show-encryption encrypted.pdfReports the encryption algorithm and key length in use.
    Evidence today
    Download the encrypted sample →
    Engine nextpdf/core@d5311d799Generated 2026-08-17SHA-256 a9f424024eaaf0fd267b0adfb3786b3d81b2dcd6e88c1445458141831eda8027Audit tools/pdf-audit@site-e3fab9f (G1-G4 geometry, T1-T2 text fidelity, F1 font embedding, S1-S2 structure, SSIM visual regression)
    Spec reference
    ISO 32000-2 §7.6 (encryption); AES-256 per FIPS 197 / ISO/TS 32004

    ScopeEncryption protects content at rest in the file; key management and distribution remain yours.

Evidence

What the result establishes

File conformance comes from the validator. Broader outcomes also depend on your content, data, certificates, and process.

  • Source

    Primary sources are recorded by clause. Each spec reference is checked against its named primary standard (ISO, ETSI, CEN, or IETF).

  • Provenance

    Samples are NextPDF engine output. The downloadable PDFs are pinned by SHA-256 in the provenance manifest.

  • Verdict

    Conformance is your validator’s verdict. A passing veraPDF / qpdf / OpenSSL run confirms the file meets the format rules. The published AATL PAdES B-LTA chain carries the document-signing certificate, RFC 3161 timestamps, and DSS validation material; EU DSS 6.4 validated the published set as PAdES-BASELINE-LTA. Legal accessibility, archival suitability, and authority acceptance also depend on your content, certificates, and process.

    Read Validate your PDF output yourself.

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