Batch Convert DWG to PDF: Sheets and Plot Scale

Learn how to batch convert DWG files to PDF, keep every sheet at the right plot scale, and check a drawing set before you issue it to clients.

Short answer: to batch convert DWG files to PDF you need two things that single-file conversion lets you ignore: a consistent way of choosing which sheet (layout) each drawing exports, and a plot scale that is set in the layout rather than guessed by the converter. If you have AutoCAD, the PUBLISH command is the batch tool and it reads the page setup saved in each layout. If you do not, PDFWalle's DWG to PDF converter handles one drawing per run with no daily cap, and Merge PDF stitches the results into a single drawing set. Either way, the scale problems people blame on batch conversion are page-setup problems, and this guide shows how to fix them once so every sheet comes out right.

Why batch conversion is harder than it looks

Converting one DWG is forgiving. You look at the result, notice the title block is cut off, change a setting, and try again. Converting forty is not. A setting that is wrong for one drawing is wrong for all of them, and nobody checks sheet 27 before issuing.

Three things vary from drawing to drawing and decide whether a batch comes out usable:

• Which space is exported. Model space holds the geometry at real-world units. Paper space layouts hold the framed, scaled sheet with a title block. A converter that exports model space gives you an unscaled drawing with no border.
• Which layout is active. A DWG can have several layouts. Most converters export the layout that was current when the file was saved, which is whichever tab the last person happened to have open.
• What page setup is saved. Paper size, plot area, plot scale and plot style live in the layout's page setup. If it was never saved, the converter falls back to defaults that fit the drawing to an arbitrary sheet.

Sheet and plot scale, explained once

In CAD you draw at full size. A ten-metre wall is ten thousand millimetres long in model space. Paper is not ten metres wide, so a layout contains a viewport, a window onto model space, and that viewport has a scale such as 1:100. At 1:100 the ten-metre wall is drawn one hundred millimetres long on the sheet.

The layout itself then has a plot scale, which is almost always 1:1, meaning "print the sheet at the size it was laid out". The two are separate. Viewport scale controls how big the drawing is inside the frame. Plot scale controls how big the frame is on the paper.

Batch conversion goes wrong when one of these is not what you think:

• A viewport scale set by zooming rather than typed in, so it is 1:97.3 rather than 1:100.
• A plot scale of "Fit to paper" instead of 1:1, so every sheet is rescaled by a different amount.
• A paper size in the page setup that does not match the title block, so the frame is cropped or floats in white space.
• A converter that ignores the page setup entirely and exports model space to A4.

Only the last one is the converter's fault. The rest travel with the file and will produce the same wrong result in every tool.

What breaks and how to fix it

Every PDF is a different size

The page setups are inconsistent, or some drawings have none saved. Fix: in AutoCAD open the Page Setup Manager on one correct layout, name the setup, then use PSETUPIN or the Sheet Set Manager to import and apply it to every layout in every drawing. Save all files before converting.

Dimensions measure wrong on the printed sheet

The plot scale was "Fit to paper", or the printer added its own scaling. Fix: set plot scale to 1:1 in each page setup. When printing the PDF, set the print dialog to "Actual size", never "Fit". Check with a scale rule on a known dimension before issuing.

Model space came out instead of the sheet

The drawing was saved with the Model tab active, or the converter only exports model space. Fix: open each file, click the layout tab you want, save, and convert again. If you cannot open the files, ask the sender to do this or to issue PDFs directly.

The wrong layout was exported

Drawings with several layouts export whichever was active. Fix: for batch work, standardise one layout name per drawing (for example "Sheet") and delete or rename stray layouts, or use PUBLISH where you pick layouts explicitly.

Line weights look wrong or everything is thin

The plot style table (CTB or STB) was not applied, or the converter does not read it. Fix: embed the plot style in the page setup and confirm "Plot with plot styles" is ticked. Online converters typically render colours and widths from the drawing's own layer settings rather than a CTB, so if a specific CTB matters, plot from CAD.

Text is replaced by boxes or a different font

SHX fonts are AutoCAD-specific and are substituted by most converters. Fix: switch text styles to TrueType fonts (Arial, for example) before a batch, or accept the substitute for internal copies.

Xrefs are missing from some sheets

The referenced files were not supplied or were moved. Fix: bind xrefs before converting, or eTransmit the set so paths are resolved.

Step by step: batch with AutoCAD or DWG TrueView

1. Fix page setups first using the method above. This is the step that makes everything else work.
2. Run PUBLISH. Add the drawings, and in the sheet list remove any model-space entries and any layouts you do not want.
3. Set "Publish to" to PDF and choose a preset. "High quality print" keeps vectors and embeds fonts; "Web and mobile" is smaller.
4. Choose one multi-sheet PDF or one file per sheet. For issue, one multi-sheet file is easier to check and to send.
5. Publish, then open the result and spot-check the first, last and one middle sheet against the DWG at 100% zoom.

DWG TrueView is free and includes the same batch publish, so you do not need an AutoCAD licence for this route, only a Windows machine.

Step by step: batch without AutoCAD using PDFWalle

PDFWalle converts one DWG per run. There is no daily limit and no account, so a set of twenty drawings takes a few minutes of clicking, and this route works on any operating system with a browser.

1. Prepare the set. Ask the sender to save each drawing with the correct layout tab active and a saved page setup. If that is not possible, expect to check each output more carefully.
2. Open the DWG to PDF converter. This is a server-assisted tool: each file is sent over an encrypted connection, converted, and deleted automatically within an hour. The limit is 25 MB per file. Use DXF to PDF for .dxf files.
3. Convert drawings one at a time. Name the downloads with the sheet number in front (01-site-plan.pdf, 02-ground-floor.pdf) so they sort correctly later.
4. Check scale on the first sheet. Open the PDF, measure a known dimension with Acrobat's measuring tool or by printing at actual size, and compare against the drawing. If it is off, the page setup or viewport scale in the DWG needs fixing before you do the rest.
5. Combine the set. Drop all the PDFs into Merge PDF, which runs in your browser without uploading anything, and download one drawing set in sheet order.
6. Add page numbers if the title blocks do not carry them with Add Page Numbers, also browser-only.

Checking a batch before you issue it

Whichever route you used, check these five things on at least three sheets:

1. Paper size matches the title block (no cropping, no floating frame).
2. A known dimension measures correctly at actual size.
3. Every discipline's layers are present. Missing content is usually a non-plotting layer; see our guide on keeping layers in a DWG to PDF export.
4. Text reads correctly and fonts are not substituted with boxes.
5. The sheet count matches the drawing register.

Frequently asked questions

Can PDFWalle convert several DWG files at once?

Not in a single run. Each conversion handles one DWG, but there is no daily limit, so you can convert a set back to back and then combine the PDFs with Merge PDF. For hundreds of drawings on a regular basis, AutoCAD or DWG TrueView's PUBLISH command is the better fit.

Does the online converter read the plot scale from the drawing?

It renders the active layout as saved, so a layout with a saved page setup and a 1:1 plot scale comes out at the right sheet size. A drawing saved on the Model tab exports model space fitted to a page, with no fixed scale.

Why do my PDFs print at the wrong scale even though the sheet looks right?

Almost always because the print dialog is set to "Fit to page" or "Shrink oversized pages". Set it to "Actual size" or 100% and make sure the paper tray matches the PDF page size.

Should a drawing set be one PDF or one file per sheet?

One multi-sheet PDF for issue and review, because it is easier to check, number and send. One file per sheet when the recipient's document system expects it, or when sheets are revised independently.

Are my drawings stored after conversion?

No. The DWG converter is server-assisted, so the file is processed on our server, and both the input and the output are deleted automatically within an hour. Merge PDF and Add Page Numbers run entirely in your browser and never upload anything.

Ready to start? Convert each sheet with the DWG to PDF converter, then combine the set with Merge PDF.