Plain English, no lawyer padding. If something here is unclear or looks wrong, tell us and we will fix the wording or the behaviour, whichever is broken.
Last updated November 6, 2026. Operated by Quantum Armadillo, LLC.
This is the part that matters most, and the honest answer differs by file type, because the formats genuinely differ.
Parsed, rendered and written entirely in your browser. The file itself is never uploaded (the exceptions: a signed-in request to Dillo that does not complete, and a set you send to 3Dillo, both described below), and we never capture an image of your drawing. If you export a DXF, PNG or SVG, that file is generated on your own machine and saved straight to your disk — it does not pass through our servers at any point.
When you open a drawing we do record a short description of its shape, to learn which kinds of drawing the product needs to handle: how many entities and of what kinds, standard layer names (A-WALL, M-DUCT), the overall width and height, and the room names and their arrangement. Room names travel only when every word is a recognised room word — “KITCHEN”, “BEDROOM 2”, “CONFERENCE 101”. A label we do not recognise is dropped whole rather than guessed at, which is how a title block, a client name, an address or a permit number never leaves your machine. Positions are measured from your drawing's own corner and rounded to the foot, so the arrangement is recorded and the site location is not. Never the filename, never the dimension text, never the drawing.
There is no practical way to read or write the binary DWG format inside a browser, so DWG conversion runs on our server. When you convert a DWG:
If a file fails to convert or display, we keep that one file privately for up to 30 days so we can find and fix the cause. It has no name or email attached, is reviewed anonymously and only by our engineers, is used for nothing else (never shared with or given to any third party, sold, or used to train AI), and is deleted once the bug is fixed, or automatically after 30 days. Files that convert successfully are never kept: the upload and the output are deleted immediately.
We do not archive, index, inspect or train on drawings you convert. We do not keep a copy "just in case." If you send us a file for a support ticket we obviously have that file — but only because you deliberately sent it, and you can ask us to delete it at any time.
These are stored, because storing them is the point — you asked us to keep them so you can come back to them. They are yours. We do not read them for marketing, sell them, or use their contents to train anything. Delete a drawing and it is gone from our systems, except a set you already sent to 3Dillo (see below).
Separately, when Dillo draws or edits a plan for you, we keep a private copy of the final drawing of that request (the drawing file and a preview image) for 30 days, so that we can see what you received if you contact us for support. Only our team can read it, and we do not sell it or use it to train AI. Each night a backup copy is made on computers we own; after 30 days, once that backup has been checked, we delete the copy from our servers. The backup is kept until we remove it, and you can ask us to delete it at any time.
If you are signed in and a request to Dillo does not complete (Dillo declines it, it is stopped, the change cannot be applied, it fails on our side, or the drawing it makes does not match what you asked), we keep a private copy of the file you had open (the DWG or DXF you opened, while it is still open in your browser) and of the drawing as it stood when the request ended, together with what you asked and how the request ended, for up to 30 days. We keep files from requests that did not complete so we can fix the problem and send you the drawing you asked for without asking you to upload anything again. Only our team can read them; they are never shared with or given to any third party, sold, or used to train AI. They are deleted automatically within 30 days of the request, backups included, and you can ask us to delete them sooner through the contact form.
If you are signed in and press "Ask us to fix this" (after a request, an export, or a file that would not open), we keep a private copy of the drawing you had open and of the DWG or DXF file it came from, or of the file that would not open, together with your note, for up to 30 days, so we can see exactly what you saw and fix it. These copies follow the same rules as the paragraph above: only our team can read them, they are never shared, sold, or used to train AI, and they are deleted automatically within 30 days, backups included. If you are not signed in, we receive your report but keep no copy of your drawing.
3Dillo is our 3D rendering product, made by the same company as CADdillo. When you send a set to 3Dillo, we share your email and the set with 3Dillo so you can open it there. Nothing is sent until you choose to send it. To build the 3D model, the set's sheets pass through our converter and are deleted as soon as the model is built. What 3Dillo receives is your email address, your CADdillo account number, the drawing's id and name, and that 3D model (the set's buildings, rooms, openings, site and parking), not your DWG or DXF file. 3Dillo handles it as described in the 3Dillo privacy policy. Once 3Dillo has the set, we delete our copy of the 3D model. If 3Dillo cannot take it, we keep that copy privately for up to 30 days so we can fix the problem, then delete it. Deleting the drawing here does not delete the copy on 3Dillo: to have it deleted there, ask us through the contact form.
We store, for as long as your account exists:
We record metadata about what you did, never the contents of your drawings (the one exception is the support copy of a drawing Dillo made for you, described above). Concretely, when you export a file we log:
That is the whole list. Not the geometry, not the text in the drawing, not the title block, not the file name, not the layer names. A row in that table says "this account exported a DXF with about 5,000 entities on Tuesday" — and nothing that could reconstruct or identify the drawing itself.
We use it for two things: enforcing the free-tier export allowance, and working out which features are actually worth building. We also count AI assistant usage separately, for the same reasons.
We use Cloudflare Web Analytics to count visits to this site and to the app. It is a small script served by Cloudflare, so Cloudflare processes this data on our behalf. We are naming it here rather than burying it, because it is a third-party script and you deserve to know it is in the page.
What it records is deliberately thin:
What it does not do is the part that matters. It sets no cookies, does not fingerprint your device, does not build a profile of you, and cannot follow you to any other website. There is no advertising network involved and the data is never sold or shared for marketing. Cloudflare does not use it to track people across the sites it serves.
We use it to answer questions we would otherwise be guessing at — which pages people actually arrive on, and whether a feature we shipped got used. If you would rather not be counted at all, any ad blocker or privacy extension will block the script, and the site works exactly the same without it.
We set two cookies, both first-party (they belong to caddillo.com, are readable only by us, and are never sent to an advertising network or any other third party):
cad_src — how you found us. Set the first
time you arrive, on caddillo.com and app.caddillo.com. It records the
site that referred you (unless that was us), the page you landed on, the
time you arrived, and any utm_source,
utm_medium or utm_campaign tags in the link
you clicked. It is written once and not overwritten on later visits,
and it expires after 30 days.
That is the complete list. If you block cookies, sign-in will not persist and we simply will not know how you found us; everything else works the same.
cad_src, described in
the cookies section.Running this thing requires a few third parties. They are:
You can ask us to show you what we hold about you, correct it, delete it, or send you a copy. Use the contact form and we will action it. Deleting your account removes your email, your saved drawings and your usage history here. A set you sent to 3Dillo is deleted there when you ask for it in the same request.
If you are in the UK or EU, the lawful bases we rely on are contract (running the account you signed up for) and legitimate interests (keeping the service working and preventing abuse).
CADdillo is a professional drafting tool and is not directed at children under 13. We do not knowingly collect their data.
If we change what we collect, we will update this page and change the date at the top. For anything material — particularly anything that would mean keeping more of your drawing data than described above — we will tell you before it takes effect, not after.
Use the contact form. A real person reads it.