> ## Documentation Index > Fetch the complete documentation index at: https://docs.filecheck.io/docs/llms.txt > Use this file to discover all available pages before exploring further. # PDF Structure > Structural and content-integrity checks in a PDF preflight profile — transparency, layers, interactivity, security, versions, and print standards. The **PDF Structure** section checks how the document is built — features that can break, change, or block print output. Many are detect-and-strip checks: the issue is the *presence* of something (a script, a layer, an attachment) that shouldn't be in a print file. Each check lists its **action**, **settings**, and the messages the customer sees. See the [profile overview](/configuration/preflight) for how actions work. ## Transparency & layers ### Transparency Detects live transparency effects that may not survive flattening on press. | Field | Detail | | :----------- | :-------------------------------------------------------------------------------------- | | **Action** | Warn (can auto-fix) | | **Settings** | None | | **Issue** | Your file uses live transparency, which can produce unexpected results on some presses. | | **Fix** | Flatten transparency and re-export your file. | | **Auto-fix** | We'll flatten the transparency automatically before printing. | ### Layers Detects optional content layers (OCGs) that may affect how the file prints. | Field | Detail | | :----------- | :--------------------------------------------------------- | | **Action** | Warn (can auto-fix) | | **Settings** | None | | **Issue** | Your file contains layers, which can change how it prints. | | **Fix** | Flatten all layers and re-export your file. | | **Auto-fix** | We'll flatten the layers automatically before printing. | ## Interactive & embedded content ### Annotations Detects comments, highlights, and sticky notes. | Field | Detail | | :----------- | :----------------------------------------------------------------------------------------------------------------- | | **Action** | Reject (can auto-fix) | | **Settings** | None | | **Issue** | Your file contains annotations such as comments, highlights, or sticky notes that must be removed before printing. | | **Fix** | Remove all annotations and re-export. | | **Auto-fix** | We'll remove the annotations automatically before printing. | ### JavaScript Detects embedded JavaScript actions, which can cause security or processing issues. | Field | Detail | | :----------- | :--------------------------------------------------------------------- | | **Action** | Reject (can auto-fix) | | **Settings** | None | | **Issue** | Your file contains embedded scripts, which aren't supported for print. | | **Fix** | Re-export your file without JavaScript. | | **Auto-fix** | We'll strip the scripts automatically before printing. | ### File Attachments Detects files embedded as attachments inside the PDF. | Field | Detail | | :----------- | :---------------------------------------------------------- | | **Action** | Reject (can auto-fix) | | **Settings** | None | | **Issue** | Your PDF has other files attached to it. | | **Fix** | Remove all attachments and re-export a clean PDF. | | **Auto-fix** | We'll remove the attachments automatically before printing. | ### Interactive Forms Detects interactive AcroForm fields. | Field | Detail | | :----------- | :----------------------------------------------------------- | | **Action** | Auto-fix | | **Settings** | None | | **Issue** | Your file contains interactive form fields. | | **Fix** | Flatten the form fields and re-export. | | **Auto-fix** | We'll flatten the form fields automatically before printing. | ### XFA Forms Detects XFA dynamic forms, which aren't supported in standard print workflows. | Field | Detail | | :----------- | :-------------------------------------------------------------------------- | | **Action** | Auto-fix | | **Settings** | None | | **Issue** | Your file contains an XFA dynamic form, which isn't supported for printing. | | **Fix** | Convert the XFA form to a standard PDF and re-upload. | | **Auto-fix** | We'll convert it to a standard PDF automatically before printing. | ### Digital Signatures Detects digital signatures that may prevent further processing. | Field | Detail | | :----------- | :------------------------------------------------------------------------------------ | | **Action** | Auto-fix | | **Settings** | None | | **Issue** | Your file contains a digital signature, and signed PDFs can't be processed for print. | | **Fix** | Remove the digital signature and re-upload. | | **Auto-fix** | We'll remove the signature automatically before printing. | ### NeedAppearances Flag Detects form fields that may render blank due to a missing appearance stream. | Field | Detail | | :----------- | :----------------------------------------------------------------- | | **Action** | Warn | | **Settings** | None | | **Issue** | Your file has a setting that may cause form fields to print blank. | | **Fix** | Flatten the form fields and re-export your file. | ## Security ### Encryption Detects password-protected or encrypted PDFs that block downstream processing. | Field | Detail | | :----------- | :-------------------------------------------------------------------- | | **Action** | Reject (can auto-fix) | | **Settings** | None | | **Issue** | Your file is password-protected or encrypted, so we can't process it. | | **Fix** | Remove the password protection and re-upload an unlocked PDF. | ### PDF Permissions Checks that the PDF's security settings don't block printing or processing. | Field | Detail | | :----------- | :------------------------------------------------------------------------------------------- | | **Action** | Reject | | **Settings** | Allow no-print restriction, Allow no-copy restriction, Allow no-modify restriction (toggles) | | **Issue** | Your file has security settings that prevent it from being printed. | | **Fix** | Remove the print restriction and re-upload. | ## Standards & versions ### PDF Version Sets the minimum and maximum accepted PDF version. | Field | Detail | | :----------- | :--------------------------------------------------------------------------------------------------------------------------- | | **Action** | Warn (can auto-fix) | | **Settings** | Min, Max (1.3 – 2.0; default 1.4 – 1.7) | | **Issue** | Your file uses PDF version `{actual.version}`, which may not be fully supported. We recommend `{target.min}`–`{target.max}`. | | **Fix** | Re-export as PDF `{target.min}`–`{target.max}` and upload again. | | **Auto-fix** | We'll convert it to a supported PDF version automatically before printing. | ### PDF/X Standard Checks conformance to a selected PDF/X print-production standard. | Field | Detail | | :----------- | :------------------------------------------------------------------------------------------------------ | | **Action** | Warn | | **Settings** | Standard (PDF/X-1a, X-3, X-4, X-5, X-6; default X-4) | | **Issue** | This product needs a `{target.standard}` compliant file — a standard built for reliable print exchange. | | **Fix** | Re-export using the `{target.standard}` setting in your application. | ### PDF/A Detects PDF/A archival-format files, which may restrict editing. | Field | Detail | | :----------- | :----------------------------------------------------------------------------- | | **Action** | Reject | | **Settings** | None | | **Issue** | Your file is saved as PDF/A, which is made for archiving rather than printing. | | **Fix** | Re-export as a standard print PDF and upload again. | ### PDF/VT Detects PDF/VT variable-data files. | Field | Detail | | :----------- | :------------------------------------------------------------------------------------- | | **Action** | Off | | **Settings** | None | | **Issue** | Your file uses the PDF/VT variable-data format, which isn't accepted for this product. | | **Fix** | Re-export as a standard print PDF and upload again. | ### PDF/UA Detects PDF/UA accessibility-tagged files. | Field | Detail | | :----------- | :------------------------------------------------------------------------------------ | | **Action** | Off | | **Settings** | None | | **Issue** | Your file includes PDF/UA accessibility tags, which aren't accepted for this product. | | **Fix** | Re-export as a standard print PDF without accessibility tags and upload again. | ### Tagged PDF Checks whether the PDF contains accessibility structure tags. | Field | Detail | | :----------- | :------------------------------------------------------------------------------------------- | | **Action** | Off | | **Settings** | None | | **Issue** | Your file doesn't include accessibility structure tags, which are required for this product. | | **Fix** | Re-export your file with tagged PDF enabled and upload again. | ## Integrity & origin ### Structure Integrity Detects internal PDF structure errors reported by the parser. | Field | Detail | | :----------- | :------------------------------------------------------------- | | **Action** | Auto-fix | | **Settings** | Max allowed warnings (default 0) | | **Issue** | Your file appears to be damaged or has internal errors. | | **Fix** | Re-export a fresh PDF from your design application. | | **Auto-fix** | We'll repair the file structure automatically before printing. | ### Linearized PDF Checks whether the PDF is structured for fast web delivery (linearized). | Field | Detail | | :----------- | :--------------------------------------------------------------------------------- | | **Action** | Off | | **Settings** | None | | **Issue** | Your file isn't linearized — a structure required by this store for fast delivery. | | **Fix** | Re-export with fast web view (linearization) enabled. | | **Auto-fix** | We'll linearize the file automatically before printing. | ### PDF Producer Filter Filters PDFs based on the application that created them. | Field | Detail | | :----------- | :------------------------------------------------------------------------------- | | **Action** | Off | | **Settings** | Whitelist, Blacklist (producer names) | | **Issue** | Your file was created with an application that may not produce print-ready PDFs. | | **Fix** | Re-export using recommended print settings and upload again. |