We opened a two-page print PDF from CorelDRAW 2019 in Illustrator 2026. The file carries six layers, and its first page uses four of them: Print, Clear, Cuts / Bigs and Info. Illustrator showed one layer, “Layer 1”, with 1,125 objects. The artwork, the cut lines and the job notes sat mixed together on it. The varnish shapes from the Clear layer were missing altogether. The file has Clear switched off by default, and Illustrator leaves out any layer that is off when it opens a PDF. Nothing on screen warned us.
A 42 x 30 inch construction sheet from a public drawing set went the same way. Its PDF carries 43 CAD layers, among them A-WALL, A-DOOR and Hatching. Illustrator put all 27,020 paths on one layer.
Adobe knows about this. The Illustrator feature request “Keep Layers from PDF when opening the file in Illustrator” had 39 votes and no answer from Adobe when we checked in September 2026. Until that changes, you have four ways to get the layers back, and one check to do first.
First check: does the PDF still have layers?
Open the file in Acrobat or Acrobat Reader and choose View > Show/Hide > Side Panels > Layers. Switch each layer off and on and watch the page.
The list alone can fool you. The public drawing set has 44 sheets, and its PDF defines 190 layers under 80 names. Only 4 of the 44 sheets have any artwork assigned to those layers. On the other 40, switching a layer off changes nothing. The set was put together through a Windows PostScript printer driver, which most likely stripped the assignments on those sheets. Nobody can extract layers from them, with any tool.
A layer that disappears from the page when you switch it off holds real content, and you can extract it.
Option 1: get the source file
If the PDF came out of Illustrator with Preserve Illustrator Editing Capabilities switched on, Illustrator reopens it with its layers. Ask the sender how they saved it.
For CAD drawings, ask for the DWG or DXF. Illustrator imports both, and its import dialog only merges the layers if you tick Merge Layers. Adobe’s help page says Illustrator reads files from AutoCAD 2.5 through 2007, so ask the sender to save a 2007 DXF.
Option 2: Acrobat Pro, one layer at a time
The eye icon in Acrobat’s Layers panel won’t do it. It changes the view, and Acrobat throws that change away when you save. Each layer’s Default State survives the save, so use that:
- In the Layers panel, right-click a layer you don’t need and choose Properties.
- Set Default State to Off. Repeat for every layer except the one you want.
- Save a copy and open it in Illustrator.
We checked the result on the CorelDRAW file. With every layer except Cuts / Bigs set to Off by default, Illustrator opened 20 paths: the cut and fold lines and their clipping paths, nothing else. Repeat the steps for each layer, then paste each result in place into one document.
This costs nothing. You save one copy per layer per page, which is fine for a label with four layers and slow for a drawing with forty.
Option 3: a script, if you write code
Python libraries such as pikepdf and PyMuPDF can read PDF layers and write each one to its own file. A public GitHub gist, “Extract all the layers of a PDF file into their own files”, shows the approach.
Keep the graphics state when you split. A simple split deletes everything inside the other layers, including the commands that set line widths and save and restore the drawing state. We ran a split like that on the construction sheet. Illustrator refused to place 61 of the 62 files, and 16.5% of the lines came out at the wrong width. When the split kept those state commands and removed only the marks, Illustrator opened all 62 files and every line kept its width.
Option 4: PDFLayerExtract
PDFLayerExtract reads the layers in your PDF, writes each one to its own PDF at the original page size and position, and adds an Illustrator script that builds one document with a named layer for each. The split is shown file by file, on a five-layer label and a 43-layer CAD sheet, in Split PDF layers into separate PDF files.
On the CorelDRAW file:
- The free check found all six layers, including the Clear layer that Illustrator had left out.
- We rendered each of the six files next to the original PDF with only that layer switched on. At 150 dpi in colour they matched pixel for pixel.
- The script built a six-layer Illustrator document in 1.7 seconds, with one artboard per page and layers named “Print p1”, “Clear p1”, “Cuts / Bigs p1” and so on.
Each layer arrives as a linked PDF. Select the linked files and click Embed, in the Properties panel or in the Links panel menu, to turn them into editable paths. Embedding all six took under a second. Afterwards the Cuts / Bigs layer held its 18 cut and fold lines, Print p1 held 919 paths and 183 compound paths, and the Info layer held its 5 text frames as live text you can edit. Illustrator puts each layer’s artwork inside a clipping group; release it if it gets in your way.
The check is free and lists every layer it finds before you pay. The price depends on the file and appears after the check.
When the PDF has no layers
If the Layers panel is empty, or switching layers changes nothing on the page, the file has no separation left in it. Rebuild the artwork or ask for the source. The free check shows the same result, so you find out before you pay.