PDF Diego

A high-accuracy PDF-to-drawing-compatible-file converter, built by an engineer-designer for engineers and designers. It removes the common quirk of converting an exported PDF back to DWG: a wide line or polyline that plots as two parallel edges instead of one, which comes back as two separate lines instead of a single line with its original width. Diego finds those doubled pairs and merges them back into a single centerline — then exports a clean DXF you can open directly in AutoCAD or any CAD software.

1. Choose a vector PDF

This only works on PDFs with real vector line work (e.g. exported/plotted from AutoCAD or similar) — not scanned or rasterized drawings. Nothing is uploaded; everything runs in your browser.

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Drop your PDF here or click to browse

2. Set the doubling gap

Only pairs of parallel lines (or concentric circles) closer together than this are treated as a doubled single line and merged. Keep this small and close to your original line weight — a large value risks merging things that were meant to be two separate lines (like the two faces of a wall).

PDF points (1 pt = 1/72 inch, at the drawing's plotted scale)

What was found

Please review before trusting this for real work: this is a geometric best-effort fix, not a certified CAD conversion. It can misfire in both directions — merging two lines that were genuinely meant to be separate (like wall faces or double borders), or missing a doubled pair that's tilted, has an inconsistent gap, or barely overlaps. Open the resulting DXF and spot-check it, especially anywhere lines look important, before relying on it.

Frequently asked questions

Want the longer version? Read our full guide: How to Fix Doubled Lines When Converting a PDF to DXF.

What kind of PDFs work with Diego?

Only PDFs with real vector line work — typically exported or plotted directly from AutoCAD or similar CAD software. Scanned or rasterized drawings don't contain the vector line data Diego needs to analyze.

What exactly is a "doubled line" and why does it happen?

When a CAD drawing with wide-width lines is exported to PDF, the plotter sometimes represents that width as two thin parallel lines (the two edges of the stroke) instead of one line with a width property. Converting that PDF back to DXF then produces two separate lines instead of the original single line.

How does the "max gap to merge" setting work?

Only parallel line pairs (or concentric circles) closer together than this gap are treated as a doubled line and merged into one centerline. Keep it close to your drawing's actual line weight — too large a gap risks incorrectly merging lines that were meant to stay separate, like the two faces of a wall.

Is any AI involved in the conversion?

No. Diego is pure deterministic geometry — it detects parallel/concentric pairs using distance and angle math, with no AI or external service involved at any step.

Can I trust the output for real engineering work?

Treat it as a best-effort geometric fix, not a certified CAD conversion. Always open the resulting DXF and spot-check it, especially in areas where line accuracy matters, before relying on it professionally.