PDF Export 'Preserve Illustrator Editing Capabilities' Behavior Change in CC 2023

Direct Answer

The Preserve Illustrator Editing Capabilities toggle does not exclude raster effects from the embedded editing data. Raster effects (drop shadows, blurs, etc.) are always rasterized into the PDF content stream at the document’s Document Raster Effects Settings resolution. When the toggle is on, the original live effect parameters and hidden layer content are stored in private Illustrator data so the file can be reopened in Illustrator with full editability. When the toggle is off, that private data is omitted; hidden layers may still appear in the PDF content stream depending on the active PDF preset.

Hidden layer inclusion with the toggle on is consistent with the round‑trip design intent—preserving the complete document structure for re‑editing—not a CC 2023 defect or inconsistency. The reported default preset shift from “High Quality Print” to “Smallest File Size” in CC 2023 is unconfirmed; verify the active preset in your version. Server‑side connection‑pool exhaustion attributed to hidden layer bloat is an infrastructure hypothesis; PDF content size alone does not directly cause pool exhaustion.

Confirmed Behavior

• Toggle on: Embeds private Illustrator data (layers, live effects, hidden objects) for full round‑trip editing. Increases file size.
• Toggle off: Omits private editing data. The PDF contains only the flattened/rasterized content stream defined by the chosen PDF preset.
• Raster effects: Always rasterized in the content stream at the document’s DRES resolution. The toggle controls whether the source parameters travel in the private data, not whether the effects are rasterized.

Likely Explanation (Not Version‑Specific Defect)

• Hidden layers are preserved in the private data when the toggle is on because the export is intended as a complete Illustrator document snapshot.
• When the toggle is off, hidden layer visibility in the PDF depends on the preset (e.g., “Smallest File Size” may discard non‑printing content; “High Quality Print” may retain it).
• No Adobe documentation limits the flag to vector content only; it governs the entire private editing payload.

Verification Steps for Your File

1. Open the document in Illustrator CC 2023.
2. Note the active PDF preset (File → Save As → Adobe PDF → Preset) and Document Raster Effects Settings resolution (Effect → Document Raster Effects Settings).
3. Export two PDFs: one with Preserve Illustrator Editing Capabilities checked, one unchecked. Keep all other settings identical.
4. Compare file sizes; the toggle‑on version should be larger.
5. Reopen both PDFs in Illustrator. Confirm which layers and live effects remain editable in each.
6. (Optional) Inspect the PDF structure with a tool like pdftk or Adobe Preflight to see whether hidden layer objects appear in the content stream when the toggle is off.

One Missing Diagnostic Detail

Does your external processing service actually parse and retain hidden layers from the PDF content stream? If it only reads the visible content stream, hidden layer bloat in the private data (toggle on) will not affect it. If it ingests the full PDF including private data, then toggle‑off or a preset that strips non‑printing content may reduce payload size. Confirm this before adjusting server pool sizing.

Assumptions & Uncertainty

• Assumes Illustrator CC 2023 (version 27.x) behavior matches the general round‑trip model; no verified CC 2023‑specific change to the toggle’s scope.
• Default preset change from CC 2022 to CC 2023 is unconfirmed; check your preset list.
• Connection‑pool exhaustion should be diagnosed as a server‑side resource issue (connection limits, timeouts, request size handling) separate from export settings.