NASJI

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Free DWG Viewer Online

Open a .dwg file in your browser and see every layer, block and dimension the way the drafter left it — no viewer to install, no account, and the file never leaves your device. It is a complete CAD, so you can measure, print, edit and save as well.

The NASJI CAD web application with a floor plan open, showing layers and the command line

This is what opens

Not a picture of your drawing — the drawing, in a real CAD

  • Every layer, block and dimension

    The file is decoded on your device and drawn as CAD geometry: freeze a layer, snap to an endpoint, read a dimension the way the drafter left it.

  • Measure, print, edit, save

    DIST and AREA in the drawing's own units, PLOT to a PDF at scale, and if something needs fixing the full toolset is already open. Save back as DWG or DXF.

  • Nothing installed, nothing uploaded

    The page is the whole install. Close the tab and nothing is left behind — no copy of your drawing anywhere but your own device.

Open a DWG now

How the online DWG viewer works

1

Drop the .dwg on this page

Or tap the button and pick it from your Files app. The page keeps the file in your browser's own storage — it never goes to a server, and the viewer is not waiting on an upload.

2

The CAD opens in this tab

The drawing is decoded on your device, on a background thread, so a 50 MB plan does not freeze the page while it loads. Layers, blocks, dimensions and hatches come up exactly as they were saved.

3

Look, measure — or keep working

Zoom to a detail, read a dimension, turn a layer off. If you need to change something, this is a full CAD: edit it and save the file back as DWG or DXF. Close the tab and nothing is left behind.

What you can do in the viewer

Most DWG viewer online tools stop at a picture you can zoom. This one opens the drawing in a real 2D CAD, which changes what a “viewer” can be.

Zoom and pan

Mouse wheel, trackpad or pinch. Zoom Extents brings the whole sheet back in one keystroke; a window zoom takes you to a corner detail.

Measure distances, angles and areas

DIST between two snapped points, AREA of a room outline, and the coordinates of any point — in the drawing's own units, so a metric plan reads in millimetres.

Layers on and off

Freeze the furniture to read the structure, isolate the dimensions, or switch the electrical layer back on. Colours and linetypes follow the layer table in the file.

Print to PDF

PLOT writes a PDF of the sheet or a window of it at a chosen scale, straight from the browser. For a quick page-fit PDF without opening the drawing, the DWG to PDF converter is one step.

Edit and save

Move a wall, retype a label, add a note, offset a line. It is the same program you would draft in — not a viewer with a pen tool — and it saves native DWG (2018) or DXF.

Any device, installable

Runs in Chrome, Edge, Safari and Firefox on Windows, Mac, Linux, iPhone, iPad and Android. Install it from the address bar and it opens like an app, offline too.

Works with

DWG R12 to 2018
Every version word from AC1009 to AC1032 — files from 1992 and files saved last week. Version 2019 to 2026 releases still write the 2018 format, so they open as well.
DXF, ASCII or binary
The same viewer reads DXF, so a laser-cutter export opens next to the plan it came from. There is a DXF viewer page if that is what you have.
Blocks, xref-style nesting, hatches, dimensions
Nested inserts, attribute text, associative hatches, dimension blocks, multileaders, splines, ellipses and 3D polylines all render; ACIS solids show their wireframe.
Phones and tablets
Touch mode: one finger pans, two fingers pinch, and a tap-and-drag picks points through a loupe so your finger does not hide the snap.
Install as an app
On desktop, the install icon in the address bar; on iPhone, Share ▸ Add to Home Screen. Once installed it opens offline and keeps a recent-files list.
Large files
Up to 100 MB in the browser. Past that, the desktop version for Windows and macOS has the memory to spare.

Why open DWG files online instead of installing a viewer

The traditional route to a .dwg viewer is a download: several hundred megabytes, administrator rights, an e-mail address to get the link, and a program that can look but not touch. It is a lot of ceremony to read a dimension off a plan a contractor just sent you — and it is no help at all on the phone the plan arrived on.

This free DWG viewer takes the other approach. The page you are on is the whole install: pick the file, it opens in a second in the same tab, and the decoding happens on your machine, so there is no upload to wait for and no server that has seen your drawing. Because it is the NASJI CAD rather than a stripped-down dwg reader, the moment you need more than a look — measure a run, hide a layer, fix a label, print a sheet — the tools are already there. If you do want something on disk for offline work or very large files, the same program is a free desktop app for Windows and macOS.

One thing it is not: a document management system. Nothing is stored, shared or versioned here. You view DWG online, you save if you changed something, and you keep your own file.

Cold start in a browser, no cuts.

From a new tab to a drawn line, uncut

  • Opens in a second

    A few megabytes of script and a canvas — no download wizard, no administrator prompt, no e-mail address to get a link.

  • Works on the phone the plan arrived on

    Pinch to zoom, one finger to pan, a loupe for picking points. Add it to the home screen and it opens like an app.

  • A full CAD when you need one

    The viewer is the NASJI CAD with your file open. Free for personal and commercial use, no watermark, no limits.

DWG viewer — frequently asked questions

Is my DWG file uploaded when I use this viewer?

No. The file is written into your browser's own storage (IndexedDB) and read from there by the CAD running in the same tab. Nothing is sent to a server, no copy is kept anywhere but your device, and closing the tab is the end of it. That is different from most online DWG viewers, which upload the file and render it on their servers.

Which DWG versions can it open?

R12 (AC1009) through 2018 (AC1032), which covers every release since 1992 — including drawings from 2019 to 2026 releases, which still save in the 2018 format. R13, R14, 2000, 2004, 2007, 2010 and 2013 are all read natively; nothing has to be re-saved first.

Can I measure in the viewer?

Yes. DIST measures between two points with object snaps (endpoint, midpoint, centre, intersection), AREA returns the area and perimeter of a boundary, and ID reads a point's coordinates. Measurements are in the file's units — if the plan was drawn in millimetres, you read millimetres.

Can I edit the DWG, not just view it?

Yes — this is the full NASJI CAD, opened with your file. Lines, polylines, arcs, circles, text, hatches, dimensions, trim, extend, offset, mirror, layers: all there. Save As writes a native 2018-format DWG or a DXF you can download. If you only wanted to look, ignore the tools.

Is the DWG viewer really free?

Completely. No account, no trial period, no watermark, no file-count limit and no paid tier that unlocks measuring or printing. The CAD is free; the only paid thing on this site is the optional AI drafting agent, which the viewer does not need.

Does it work on an iPhone or Android phone?

Yes. Open this page in Safari or Chrome, tap Open a file and pick the DWG from Files, Drive or an email attachment. The CAD switches to touch mode — pinch to zoom, one finger to pan — and can be added to the home screen as an app. A 30 MB site plan opens fine on a recent phone; very large files are more comfortable on a tablet or laptop.

Open your DWG now.

Open a DWG file Get the desktop app

Free, no account, nothing uploaded. Works on phones and tablets too.

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