Yes, simply open the .html file with Chrome or Firefox. These browsers have device mode.

You can change the screen size and see how it looks on mobile or tablet sized screens.

Answer from Hans on Stack Overflow
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CodeShack
codeshack.io β€Ί html-viewer
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πŸ’» Mobile and Desktop Site Options: Choose to view the mobile or desktop version of websites. πŸ“₯ File Import and Export: Import website addresses or HTML files from other apps and export the source code. πŸ“± Compatibility: Fully supports the latest Android 14. Why Choose HTML Viewer?
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Discussions

How to test html file for mobile responsiveness - Stack Overflow
I need to test an html file for mobile responsiveness, but all the resources I have found to do this need a URL or a localhost, is there any way to test responsiveness with just an html file? More on stackoverflow.com
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How to open local file from Android HTML Viewer? - Android Enthusiasts Stack Exchange
I am trying to make an html file that I can open with HTML Viewer and play a video stored locally on my phone. However, when I open the html with HTML Viewer I get this: It shows the video player,... More on android.stackexchange.com
🌐 android.stackexchange.com
December 17, 2024
Open a local HTML file on a phone?
Try this: https://play.google.com/store/apps/details?id=tech.sandeepkumar.stockfilesmanager Click on html file, then choose HTML viewer or any browser and chill. More on reddit.com
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5
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September 9, 2024
Html viewer
Web browsers are html viewers More on reddit.com
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June 18, 2023
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Is this HTML Viewer tool free?
Yes, this online HTML Viewer is completely free to use.
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apps.apple.com β€Ί us β€Ί app β€Ί html-viewer-q β€Ί id810042973
HTML Viewer Q App - App Store
HTML Viewer Q is a lite HTML file management tool. You can import files via ""iTune File sharing"" to it. And the tool will help you to edit & view them easily. ****************************************************** Feature ****************...
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How to open local file from Android HTML Viewer? - Android Enthusiasts Stack Exchange
December 17, 2024 - So "HTML Viewer" is a third party app? If yes please add a link in your question to it's Play Store site. App names can be totally different for different localizations. The linked question is about using the file protocol for accessing local files in the shared storage of Android.
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Reddit
reddit.com β€Ί r/androidquestions β€Ί open a local html file on a phone?
r/AndroidQuestions on Reddit: Open a local HTML file on a phone?
September 9, 2024 -

I considered it a no-brainer. I was wrong.

I wanted to take along some files to read when I'm out of network reach or in flight mode. The files happen to be quite plain HTML files, no script, just a CSS file defining the simple layout, and that's it. So I copied the HTML and the CSS files onto my phone and tried to open them.

First attempt was from a file manager. It told me that it no idea what to do with an HTML file. I then tried to look for an "open file" entry in Chrome. Nope. Same in Firefox. Then I tried to force-open the files by using a file:///path/to/file style URL - and it actually submitted the whole string to Google as a search string, as if Chrome (and Firefox) had been lobotomized of the file: protocol.

Now I'm at a loss - is there no way to open a simple HTML file on an Android 13 phone?