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.AVCI file extension

To open .AVCI files on Windows, try opening the file in GIMP if you have a version that includes AVCI still-image import support, such as the 3.1.2 development line or newer.

To open a .AVCI file, first try an Apple device or an image application with AVCI/HEIF support. On Windows or Linux, use a tool such as a supported GIMP development release or GraphicsMagick built with libheif and H.264/MPEG-4 AVC support.

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Last updated: April 29, 2026 · Reviewed by Julian Stricker

Open on your device

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

How to open .AVCI files

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

Windows

  1. Try opening the file in GIMP if you have a version that includes AVCI still-image import support, such as the 3.1.2 development line or newer.
  2. Alternatively, use GraphicsMagick only if your build includes libheif and H.264/MPEG-4 AVC support; for example, test it with a command such as "gm identify file.avci".
  3. If neither tool recognizes the file, transfer it to an Apple device or ask the sender to export it as PNG or JPEG.
Full Windows guide

Mac

  1. Double-click the .AVCI file or press Space in Finder to try Quick Look, since Apple platforms document support for the AVFileType.avci format.
  2. If it does not preview, Control-click the file, choose Open With, and try an Apple image viewer or photo application available on your Mac.
  3. If macOS still cannot open it, try GIMP with AVCI import support or convert it with a compatible GraphicsMagick build.
Full Mac guide

Linux

  1. Try GIMP if your installed version includes AVCI still-image import support.
  2. For command-line use, try GraphicsMagick built with libheif and H.264/MPEG-4 AVC support, such as "gm identify file.avci" or converting to PNG.
  3. If your distribution's image viewer does not recognize the file, install/update shared-mime-info and a compatible decoder stack, or convert the file on another system.
Full Linux guide

iOS

  1. Open the file from Files and try previewing it directly; Apple platforms document .avci as a supported high-efficiency image file type.
  2. If it does not preview, use the Share button to send it to an installed app that can import Apple-supported image formats, or convert it on a desktop computer.
Full iOS guide

Android

  1. Android support for .AVCI is not reliably documented; try opening it from Files or Downloads only if you have an image viewer that explicitly supports AVCI/HEIF with H.264.
  2. If the file is not recognized, transfer it to macOS/iOS or a desktop tool such as compatible GIMP or GraphicsMagick, then export to PNG or JPEG.
Full Android guide

Security notes

  • .AVCI files are image files and are not expected to contain macros or executable scripts, but malformed image files can still target bugs in HEIF or H.264 decoders.
  • Open untrusted .AVCI files in fully updated software, especially because the format depends on relatively complex container and video-decoding components.
  • Be cautious when sharing converted copies: image containers can include metadata, so remove metadata first if location, device, or workflow details are sensitive.

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Can't open this file?

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

Common reasons

  • The file is not recognized as an image
  • A HEIF-capable app still cannot open it
  • Conversion fails or produces a blank image
  • The file was renamed but still will not open

Fix steps

  1. Try opening it on an Apple device first.
  2. On Windows or Linux, use GIMP with AVCI import support or GraphicsMagick built with libheif and H.264 support.
  3. Ask the sender to export the image as PNG, JPEG, or another widely supported format.

OS-specific troubleshooting

What is a .AVCI file?

.AVCI is registered as the image/avci media type. It represents an Advanced Video Coding Image: a still image compressed with AVC/H.264 and encapsulated using the High Efficiency Image File Format defined by ISO/IEC 23008-12. The format is related to HEIF, but the .avci extension specifically indicates AVC-coded still images rather than a generic .heic or other HEIF variant.

Background

An .AVCI file is a still-image format based on AVC/H.264 video compression inside a HEIF container. The freedesktop shared MIME database describes it as an AVC-encoded image encapsulated in HEIF, and identifies files using the .avci extension and an AVCI file type brand.

Common MIME types: image/avci

Further reading

Authoritative resources for more details on the .AVCI format.

Common .AVCI issues

The file is not recognized as an image

.AVCI is less common than JPEG, PNG, or HEIC, so many default image viewers do not associate the extension with a supported decoder.

  1. Try opening it on an Apple device first.
  2. On Windows or Linux, use GIMP with AVCI import support or GraphicsMagick built with libheif and H.264 support.
  3. Ask the sender to export the image as PNG, JPEG, or another widely supported format.

A HEIF-capable app still cannot open it

Not every HEIF reader supports every HEIF-based coding format. AVCI uses AVC/H.264 compression, so a program may support HEIC or AVIF but not AVCI.

  1. Check whether the application specifically mentions AVCI, image/avci, H.264 in HEIF, or AVC-coded still images.
  2. Update the application and its HEIF/H.264 decoding libraries.
  3. Try a different tool rather than renaming the file to .heic or .avif.

Conversion fails or produces a blank image

The converter may have been built without the required HEIF or H.264/MPEG-4 AVC support, or the file may be incomplete.

  1. Verify the file size and re-download or re-copy the file if it may be truncated.
  2. Test the file with a diagnostic command such as "gm identify file.avci" in a compatible GraphicsMagick build.
  3. If possible, open the original file on the device or application that created it and export a new copy.

The file was renamed but still will not open

Changing the extension does not change the internal image format. A real .AVCI file must contain the correct HEIF/AVCI structure.

  1. Restore the original filename extension if it was changed.
  2. Use a real export or conversion tool to create PNG, JPEG, or another target format.
  3. If you are unsure what the file is, inspect it with a file identification tool rather than guessing by extension.

FAQ

Is .AVCI the same as .HEIC?

No. Both are related to HEIF-style image storage, but .AVCI specifically identifies AVC/H.264-coded still images. A program that opens HEIC files may not necessarily support AVCI.

Can I convert .AVCI to PNG or JPEG?

Yes, if you use software that can read AVCI first. Compatible GIMP builds or GraphicsMagick builds with libheif and H.264 support may be able to import or convert the file.

Can I make a file open by renaming .avci to .jpg or .heic?

No. Renaming only changes the filename suffix. The image data remains AVCI and still requires software that understands that format.

Why does my phone not open an .AVCI file?

Support varies by platform and app. Apple platforms document .avci support, while Android support is not reliably documented; if it fails, convert the file on a compatible desktop or Apple device.

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