DWG viewer for iPhone and iPad
This DWG viewer for iPhone and iPad opens DWG and DXF files in Safari with no App Store download and no account. Small and medium drawings render well on an iPhone; an iPad handles larger ones. The file stays on the device.
Open a DWG on an iPhone without an app
iOS cannot preview a .dwg. Mail shows it as a gray attachment, Files shows a generic icon, and Quick Look declines. What iOS can do is hand the file to a web page: Safari supports WebAssembly and WebGL, so this viewer converts and renders the DWG on the phone's chip without any native app.
The one habit to learn is saving the attachment to the Files app first. Tap the attachment in Mail or Messages, choose Save to Files, then pick it from the viewer. AirDropped files land in Downloads inside Files and work the same way. The file picker inside Safari can also reach iCloud Drive, Google Drive, Dropbox, and OneDrive directly, as long as the matching app is installed and signed in.
iPhone vs iPad: memory is the limit
Safari gives each tab a memory budget, and on an iPhone that budget is smaller than on an iPad. A few-megabyte architectural plan opens in seconds on either. A dense 30 MB mechanical drawing may cause Safari on a phone to reload the tab, while the same file opens on an iPad Pro. Files over 60 MB are skipped by design. Closing other Safari tabs before opening a heavy drawing frees memory and can make the difference on an older iPhone.
If a drawing will not open on the phone, the options are an iPad, a laptop, or asking for a PDF version, which iOS previews natively. The mobile DWG viewer page has a more general note on phone limits.
Touch controls and tools on iOS
Pinch to zoom, drag to pan, tap fit to view to recenter. The layers panel lets you hide dimension and text layers, which is often the difference between readable and unreadable on a 6-inch screen. Measure the distance between two points by tapping them.
Export PDF produces a vector file you can share from Safari to Mail, Messages, or Files. Export PNG grabs the current view, useful for marking up in Photos. Print uses Safari's print dialog, so AirPrint printers appear directly. The dark theme is available and helps on a bright site.
Layers are also the trick for finding small text: hide hatches first, then zoom in on the note you need. Exported PDFs keep the vector lines, so pinching into the PDF later in Files stays sharp at any zoom.
View a DWG file on iPhone in three steps
- Save the .dwg to Files (from Mail, Messages, AirDrop, or iCloud Drive).
- Open this page in Safari, tap the drop zone, and pick the file from Files.
- Pinch and pan, toggle layers, measure, then share a PDF or PNG if you need to pass it on.
Chrome and Firefox on iOS use the same Safari engine underneath, so they behave identically. A longer walkthrough is in how to open a DWG file on iPhone.
DWG viewer for iPhone and iPad: apps compared
| Option | Install | Account | Offline | Best for |
|---|---|---|---|---|
| DWG Viewer (this site) | None, runs in Safari | No | File stays on device; page loads once | One attachment, right now, privately |
| AutoCAD mobile app (Autodesk) | App Store | Autodesk account | Yes, with sync | Daily site review, markup, light editing |
| DWG FastView | App Store | Optional | Yes | Offline viewing with a free tier |
| Autodesk Viewer (web) | None | Autodesk account | No, uploads the file | Sharing a view link |
If you review drawings on site every day, the AutoCAD app with its offline sync is worth installing. For the occasional attachment, the browser route saves the install and keeps the drawing off the cloud.
Supported files and privacy on iOS
DWG from AutoCAD R14 through 2018 and newer opens; DXF opens from any version in ASCII or binary; DWG R12 and older open partially; DWF and DWFX do not open. The viewer never writes a DWG. The 9 MB WebAssembly module that converts DWG is fetched the first time a DWG opens in a session and cached by Safari afterward; on cellular data that is the only noticeable download.
Nothing is uploaded. The file is read by JavaScript inside the Safari tab and discarded when the tab closes, which is the right default for an NDA drawing opened from a client's email on a personal phone. For DXF-only work on iOS, see the DXF viewer for iPhone page.
Frequently asked questions
Can I view DWG files on an iPhone for free?
Yes. Open this page in Safari and pick the file from Files. No app, no account, no watermark on exports.
Is there a built-in DWG viewer on iOS?
No. Files, Mail, and Quick Look do not render DWG. You need a browser viewer or an app such as AutoCAD mobile.
What is the best DWG viewer for iPad?
For occasional files, Safari with this viewer; the iPad's larger memory budget handles bigger drawings than an iPhone. For daily project work with offline folders, the AutoCAD mobile app.
Can I open a DWG attachment directly from Mail?
Save it to Files first (tap the attachment, then Save to Files), then pick it in the viewer. Mail cannot hand the file to a web page directly.
Why does Safari reload the page when I open a big DWG?
The tab ran out of memory. iPhones give each tab less memory than iPads, so a dense DWG can exceed it. Use an iPad or laptop, or ask for a PDF.