HTML File Format (.html): What It Is and How to Open It

HTML at a glance#

Full name	HyperText Markup Language
File extension	.html
Category	Documents
Developer	Tim Berners-Lee
First released	1993
MIME types	text/html
Other extensions	.htm
Compression	Uncompressed
Specification	HTML Living Standard
FileFlip support	FileFlip reads and writes this format

What a .html file can hold#

These are the things a HTML file either supports or does not, and they are what decides whether a conversion keeps everything or quietly drops something.

Embedded metadata	Yes
Selectable text	Yes
Audio	Yes
Video	Yes
Human readable	Yes

Strengths and limitations of HTML#

What HTML does well

Reflows to any screen size because it describes structure rather than fixed page geometry
Opens in every web browser on every platform without installing a dedicated reader
Readable as plain text, so its markup can be inspected or edited without special software
Expresses headings, lists, tables and links in a way almost every document format can import

Where HTML falls short

A single HTML file does not carry its images; it only references them by URL unless they are inlined as data URIs
Has no fixed page size, so it does not reproduce a print layout the way PDF does
Rendering can vary between browsers when a page relies on newer CSS or JavaScript features

Use HTML when a document needs to reflow in a browser or serve as a structured intermediate step between other document formats.

Convert HTML to PDF when the page needs to keep one fixed layout for printing or archiving, or convert it to DOCX to keep editing it in a word processor.

How to open a .html file#

A .html file opens in the programs below, grouped by the platform you are on. If you would rather not install anything, FileFlip converts HTML into a format your machine already opens, and it does it in the browser tab rather than on a server.

Platform	Programs that open it
Windows	Google Chrome, Microsoft Edge, Firefox
macOS	Safari, Google Chrome, Firefox
Linux	Firefox, Google Chrome
iOS	Safari, Google Chrome
Android	Google Chrome, Firefox
Web	FileFlip

HTML questions people ask#

What is an HTML file?

An HTML file is a plain-text document written in HyperText Markup Language, tagging content as headings, paragraphs, links, tables or images so a browser knows how to lay it out. Tim Berners-Lee created it in 1993, and it remains the markup every web browser renders.

Does an HTML file include its images?

Not by default. An HTML file normally references images by file path or URL rather than storing the image data itself, so moving the HTML file alone leaves those images behind unless they are copied along with it or embedded directly as base64 data URIs.

Is HTML a fixed-layout or reflowable format?

HTML is reflowable: it describes a page's structure and lets the browser decide how to lay it out for the available screen width, rather than pinning text to an exact position the way a fixed-layout PDF page does. That is also why the same HTML file looks different on a phone than on a desktop monitor.

Can I open an HTML file without an internet connection?

Yes, an HTML file on a local disk opens directly in any browser without a network connection, though anything it references by URL, such as an externally hosted image, font or script, will not load unless a copy exists locally too.

Why convert an HTML file to PDF?

Converting HTML to PDF locks the reflowable page into one fixed layout, which matters for printing, archiving or sending a document that has to look the same on every screen instead of adapting to it.

Converting HTML files#

Every conversion runs inside your browser. The file is read from your disk, the work happens on your own machine, and nothing is uploaded. How FileFlip works names the engine behind each family and how to verify that for yourself.

HTML File Format (.html)