ZIP site checker

What the checker looks for

A static website is just files that point at other files. When a single reference is wrong — a typo, a capital letter, a folder that was not included in the ZIP — the browser quietly gets a 404 and the page loses its styles, images or scripts. This tool reads every HTML and CSS file in your ZIP or folder, extracts each src, href, url() and @import, resolves it the way a browser would, and checks that the target exists exactly.

• Missing start page. A link has to open something; that something is index.html at the top of the upload.
• Missing files. Referenced in the code but not in the ZIP — usually a folder you forgot to select when zipping.
• Wrong case. Images/Logo.PNG versus images/logo.png: identical on Windows and macOS, two different files on a Linux web server.
• Local paths and backslashes. C:\Users\… or file:/// references that can only ever work on your computer.
• Size, file count and blocked types. The HTMLtoLink limits are 2 MB per site on Free (25–75 MB on paid plans) and 1,000 files (ZIP uploads up to 2 MB); executables and installers are refused.

How to make a ZIP that publishes cleanly

1. Open the folder that contains index.html.
2. Select everything inside it (not the folder itself — although a single wrapping folder is handled automatically here).
3. Compress: right-click → Compress on macOS, Send to → Compressed (zipped) folder on Windows.
4. Drop the ZIP above, fix anything red, then publish it from the home page.

The ZIP website guide walks through folder structure, absolute vs relative paths and single-page apps in more detail.