NASJI

Free conversion · No account · Windows, Mac & Linux

Convert DWG to an older version without losing your original.

Start with the recipient’s CAD release. This guide explains the common 2018-to-2010, 2018-to-2013 and 2007 compatibility requests, with a converter and a short verification checklist.

What format will you receive?

NASJI’s available output encodings are shown below. A compatible older file is different from a native file of the selected year.

Receiving AutoCAD releaseNative familyNASJI output
2018–2026AC1032AC1032 · Native format
2013–2017AC1027AC1018 · 2004-compatible
2010–2012AC1024AC1018 · 2004-compatible
2007–2009AC1021AC1018 · 2004-compatible
2004–2006AC1018AC1018 · Native format
2000–2002AC1015AC1015 · Native format
R14AC1014AC1014 · Native format
Format compatibility reference: Autodesk

Three steps to a compatible drawing

  1. 1

    Upload a copy

    Choose a DWG or DXF up to 100 MB. Files are sent to NASJI’s server for conversion. Keep your original.

  2. 2

    Choose the receiving release

    Pick the DWG version from the selector. For 2007, 2010 and 2013, read the compatibility note before converting.

  3. 3

    Download, open and verify

    Download the DWG. The adjacent Open in CAD button opens that same converted file. Check a known dimension, units, layers and critical objects.

Modern DWG → AutoCAD 2007, 2010 or 2013

Select the recipient’s release below. NASJI writes these three targets as AutoCAD 2004-format AC1018, which those releases can read. This is compatible output, not native AC1021, AC1024 or AC1027 encoding. If a deliverable specification explicitly demands one of those native formats, use the original application’s Save As or Autodesk’s conversion tools.

AutoCAD 2024 → 2018 may need no downgrade

Both use the 2018 DWG format family. If a file still will not open, investigate corruption, missing dependencies and unsupported custom objects rather than repeatedly converting the same format. Use a copy and ask the sender to audit the original when needed.

Sending to AutoCAD 2000 or Release 14

Choose the oldest release the recipient genuinely needs: 2000 produces AC1015; R14 produces AC1014. Very old formats have fewer entity features. Check the simplified result in the target application before handing it over, especially complex blocks and annotations.

Try a known drawing before your project

Download our original 200 × 120 mm test plate with four Ø10 holes, supplied in four actual DWG encodings. These synthetic sample files are CC0 and contain no customer drawings.

Sample DWG 2018Sample DWG 2004Sample DWG 2000Sample DWG R14

DWG version conversion questions

Is the converter free?

Yes. File conversion and manual CAD editing are free without an account. AI drafting is a separate optional paid feature, with two free generated files on the AI CAD page.

Can I convert on a Mac or Ubuntu?

Yes. The converter works through a modern browser on Windows, macOS and Linux. No AutoCAD installation is required.

Will it preserve every object?

No converter should be assumed to preserve every application-specific feature. NASJI converts supported entities and reports skipped types when available. Compare the output with the original, including layouts, linked files, fonts and any specialist objects.

Can changing .dwg to another extension fix the version?

No. Renaming changes the filename, not the DWG encoding. Use a real conversion and verify the resulting file.

Your file opens. Now finish the drawing.

Open the converted DWG in free web CAD to measure or edit it. For drafting from a prompt, try two free AI files, then view your personal Unlimited AI offer.

Open free web CADTry the AI CAD generatorView Unlimited AI offer

AutoCAD is an Autodesk trademark. NASJI is an independent product.