How to export your Construct 3 game for the web

What you need

• A Construct 3 project, in the browser-based editor or the desktop app. There is no separate SDK to install: Construct compiles your project in the cloud when you export.
• An internet connection while you export. Construct's script minifier runs as a cloud service, so exporting with Minify script on needs you to be online, even if you built the whole game offline.

Your build runs inside an iframe on naughty.games, behind the site's own age gate, so nothing extra is needed inside the project for that.

Export for the web

1. Open the Export dialog. From the main menu, choose Project > Export.
2. Choose Web (HTML5). Construct also exports to Android, iOS and desktop wrappers from the same dialog; pick Web (HTML5) for naughty.games.
3. Turn on the shared optimisation options. Enable Deduplicate images, Optimize images, and Minify script in Advanced mode. These make exporting take a little longer but produce a smaller, harder to copy build, and Construct's own documentation recommends leaving them on for a finished release, only turning them off to speed up a quick test export.
4. Turn off Offline support. The web export has a separate Offline support checkbox, on by default. See the box below for why to turn it off before uploading to naughty.games.
5. Export. Click Export and wait for Construct to compile the project and hand you a zip to download.

Why to turn off Offline support

Construct's Offline support option is on by default for web exports. Once a player has loaded the game once, it keeps working without an internet connection by installing a service worker that caches the build in the browser. That is a good feature on your own site, but naughty.games does not allow hosted builds to register a service worker at all: a request to install one is refused outright. Leaving Offline support on will not break your upload, but the service worker registration will fail in every player's browser and log an error. Turn the checkbox off so the build does not try.

Construct's Export Manager keeps track of your last few exports, so if you need to grab the same zip again later, or compare a new export against the one you already uploaded, you do not have to export from scratch. It is worth checking there before re-exporting a large project just to re-download a build.

Test it locally

Opening the exported index.html straight from your file system will not work reliably: Construct's HTML5 export loads its scripts and assets in ways that browsers restrict on file:// pages, the same restriction that affects every other engine's web export.

Serve the exported files over HTTP instead. From inside the unzipped export folder, run:

python -m http.server 8000

Then open http://localhost:8000 and play through the game before you upload it anywhere.

Zip it for upload

• Construct's own export zip already places index.html at the top level, so in most cases you can upload the zip Construct gave you without repacking it.
• If you unzip it to make manual changes, keep index.html at the top when you re-zip. A build with index.html nested inside a subfolder will not be recognized.
• Stay under 250 MB unpacked and 2,000 files. Construct projects usually stay well under this unless you are shipping a lot of full-resolution video or voice audio; Optimize images and a lossy image format for background art help if you are getting close.

Common problems

1. The browser console shows a service worker registration error. Offline support was left on. The game still runs, but turn Offline support off and export again for a clean build.
2. The export fails partway through or times out. Minify script depends on a cloud service, so a dropped connection mid-export can fail it. Just export again once you are back online.
3. A scripted (JavaScript) feature works in preview but breaks only in the exported build. Advanced minification renamed something your script relied on. Switch Minify script to Simple mode, or check the Construct documentation's guide to advanced minification for how to keep specific names.
4. The zip is too big to upload. Turn on Optimize images and pick a lossy format for background art or photos, and enable Deduplicate images if the same artwork appears in more than one object.
5. No sound plays until the player interacts. Browsers block autoplaying audio until a click or tap. This is expected, not a bug in your project.

Publish it

Once the export runs cleanly from a local server with Offline support turned off, zip it with index.html at the top level (up to 250 MB unpacked and 2,000 files) and upload it to naughty.games, or send us an https URL if you would rather embed it. Review is usually about 2 working days, listing is free and non-exclusive, and any Patreon, Ko-fi, Steam or itch links inside the game earn you 100% of what they bring in. Head to /submit when you are ready.