How to Convert a Scanned Floor Plan to DXF, Free, in Your Browser

Use a flat, evenly lit scan with readable dimensions. Around 300 DPI is a practical starting point for paper scanning, not a universal accuracy threshold; inspect whether the smallest relevant line and text survives. Higher resolution cannot restore detail absent from the original.

For a photographed plan, reduce skew and shadows before conversion. For PDFs, the current Atlasly import processes the first page into an image; split or select the intended page beforehand. Browser processing also limits decoded image size, so do not assume every source pixel is preserved.

The drawing-mode path processes linework in the browser. Photo-classified inputs automatically receive a cloud drafting pass after the local preview. Classification is automatic, so a photograph of a paper plan must not be assumed to stay local. Check the current tool disclosure and input classification before supplying confidential material.

For a facade photograph rather than a plan, use the separate Vector and Elevation guide. A drawing-mode result and a photo drafting result have different assumptions.

Inspect long walls, corners, door swings, stairs and tightly spaced hatching against the scan. Tracing can fragment a line, bridge a gap or convert a annotation into unwanted geometry. Review uncertain fragments rather than accepting every stroke.

The current drawing path can recognize text and add CAD TEXT entities. Recognition does not prove that a dimension is correct. Check characters, decimal points, units and placement. Some confirmed repeated-opening groups can export as blocks; the converter does not recreate the original author’s complete block structure or BIM objects.

Calibrate against a measured dimension or a reliable dimension on the original drawing. Never treat a typical door width or guessed storey height as a known measurement. Check a second, independent dimension after import. One calibration cannot correct perspective, paper stretch or unequal distortion in two directions.

Illustrative check: a dimensioned line is 5,000 mm. Calibrate across its actual endpoints, then measure a separate 3,000 mm dimension in the receiving CAD application. If the second check is wrong, investigate distortion or endpoint selection rather than stretching the drawing to make one value look right. These numbers illustrate a check, not a conversion accuracy result.

CAD downloads require a free account. The current download path supports DXF, SVG and vector PDF. Confirm the selected output in the receiving application; a successful download is not a compatibility or measurement certificate.

Open the DXF in your chosen CAD application. Confirm units, overall extents, a second dimension, layer visibility and representative text. Remove duplicate or stray lines, close boundaries deliberately where needed, and redraw critical details from reliable evidence. Import into a BIM application as an underlay where supported; it does not arrive as native walls, doors or rooms.

An unclear scan, an assumed scale or a changed building can make the reconstructed drawing unsuitable for measurement. Use it to scope the next survey and early options, and retain a visible note of its source and limitations. If the original CAD file is available, inspect that before reconstructing its plotted image.

For why ordinary PDF extraction can fail, see scanned PDF conversion limits.