How to open .HTM files on Windows
To open .HTM files on Windows, double-click the .htm file to open it in your default web browser.
Step-by-step instructions
- Double-click the .htm file to open it in your default web browser.
- If it opens in the wrong app: right-click the file → Open with → choose a web browser (or a text editor to edit the source).
- For troubleshooting, open it from a browser using File → Open (or drag the file into the browser window).
Common issues
The .htm file opens as plain text instead of a web page
The file is being opened in a text editor, or the system’s file association for .htm isn’t set to a browser.
- Use Open with to select a web browser and (if offered) set it as the default for .htm.
- Alternatively, drag the .htm file into an open browser window.
The page looks broken (missing images/CSS) when opened locally
The .htm file may depend on additional files (images, stylesheets, scripts) that weren’t saved or aren’t in the expected relative paths.
- Verify that any referenced files (e.g., folders for images or CSS) are present alongside the .htm file as expected.
- If it was exported or downloaded, re-export/re-download ensuring “complete webpage” (HTML plus assets) was saved, not just the HTML file.
Browser warns about blocked scripts or mixed/unsafe content
HTML can include or reference script content; browsers may restrict scripts or local file access for safety, especially for local files.
- If you don’t trust the source, do not bypass the warning—view the file as text instead.
- If it is your own page, test by serving it from a local web server rather than opening via file://, which can change security and loading behavior.
Double-clicking does nothing or opens the wrong app
The default application mapping for .htm may be missing or misconfigured.
- Manually open it in a browser using Open with.
- Reset the default app association for .htm to a web browser in your system settings.
Security note
Treat .htm files as potentially active content: they can include scripts and load external resources, so opening untrusted .htm files may expose you to phishing-style interfaces or unexpected network requests.