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.HTM file extension

To open .HTM files on Windows, right-click the .htm file and choose open with..

.HTM files are typically opened with software that supports HTM Document File. Open with web browsers, code editors, or build tools for web development. Avoid renaming the extension directly, because renaming does not convert the actual file format.

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Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .HTM files

Use these platform-specific instructions to open .HTM files safely.

Windows

  1. Right-click the .HTM file and choose Open with.
  2. Select a trusted Windows app that supports .HTM files.
Full Windows guide

Mac

  1. Control-click the .HTM file and choose Open With.
  2. Pick a compatible Mac application to open the file.
Full Mac guide

Linux

  1. Open the .HTM file from your file manager with Open With.
  2. Choose an installed Linux app that supports this format.
Full Linux guide

iOS

  1. Open the .HTM file from Files and tap Share.
  2. Send it to a compatible iOS app if Quick Look cannot preview it.
Full iOS guide

Android

  1. Open the .HTM file from Files or Downloads.
  2. Choose a trusted Android app that supports the format.
Full Android guide

Can't open this file?

These are the most common causes and fixes when .HTM files fail to open.

Common reasons

  • .HTM file does not open

Fix steps

  1. Install or update a compatible application.
  2. Verify the file came from a trusted source and was fully downloaded.
  3. Try opening the file in an alternative app on another platform.

OS-specific troubleshooting

What is a .HTM file?

.HTM is a HTM Document File format used for web pages, browser rendering, and front-end assets. Web formats can include markup, styling, structured data, scripts, and resource references. Common MIME type: text/html. If the file does not open, check that you are using a compatible app and a complete, trusted file source.

Common MIME types: text/html

Common .HTM issues

.HTM file does not open

This usually means the required app is missing or the .HTM file is incomplete.

  1. Install or update a compatible application.
  2. Verify the file came from a trusted source and was fully downloaded.
  3. Try opening the file in an alternative app on another platform.

Security notes

  • Only open .HTM files from trusted senders.
  • Scan downloaded files before opening them.
  • Avoid running embedded scripts or macros unless you trust the source.

FAQ

Can I convert a file by renaming it to .HTM?

No. Renaming changes only the suffix. Use a proper conversion tool or export function.

Is .HTM safe to open?

It can be safe when the file comes from a trusted source and is opened in reputable software.

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