agc

.agcApple Graphics Converter

Apple Inc. · 1984

Developer
Apple Inc.
Category
Images
MIME Type
image/x-apple-graphics-converter
First Released
1984
Open Format
No
File Signature
Not readily documented or consistent across all variations.
At a Glance
.agc
Apple Graphics Converter

An old Apple image format primarily used for graphics and icons on early Macintosh systems.

Reviewed on June 9, 2026
Compression
Uncompressed
Transparency
No
Editability
Low
Best for
Simple bitmap graphics

Key Features

  • Bitmap image storage
  • Simple structure for early systems
  • Limited metadata support
  • Primarily used for icons and UI elements

Best For

  • Historical preservation of early Apple graphics
  • Emulation of classic Macintosh environments
  • Files generated by very old Apple graphics software

Less Ideal For

  • Modern web graphics
  • High-resolution photography
  • Complex illustrations with many layers
  • Images requiring transparency or animation

Common Use Cases

  • Storing icons for early Macintosh applications
  • Representing simple graphics within Apple software
  • Archiving historical digital art from the 1980s
  • Preserving UI elements from classic Mac OS

How to Open It

  1. Use specialized retro computing emulators like Basilisk II or SheepShaver that can run classic Mac OS.
  2. Attempt to open with advanced image editors that support a wide range of legacy formats, though success is not guaranteed.
  3. Convert the file to a more common format using a dedicated file conversion tool if it has AGC support.

What is a .agc file?

The AGC file format was an early image format used by Apple computers, particularly during the Macintosh era. It was designed to store simple graphics and icons, often used for user interface elements. While it was common in its time, it has largely been superseded by more modern and versatile image formats. These files typically contain bitmap data and some basic metadata related to their display. Due to its age and limited feature set, direct support for AGC files is rare in contemporary software.

Programs That Open .agc Files

PlatformProgram
WindowsBasilisk IIFree
macOSSheepShaverFree
LinuxBasilisk IIFree

How to Convert .agc Files

FormatMethod
.PNGRetroArch, Specialized converters (if found)
.GIFRetroArch, Specialized converters (if found)

Common Problems with .agc Files

⚠️ File not recognized by modern software.
Use a classic Mac OS emulator or attempt conversion with a specialized tool.
⚠️ Lack of transparency support.
Manually edit the image in a graphics program to add transparency to a converted format if needed.

Frequently Asked Questions

Is AGC a common image format today?

No, the AGC format is obsolete and rarely used or supported by modern software.

Can I open AGC files on my current operating system?

Directly opening AGC files is difficult. You will likely need to use an emulator or convert the file if possible.

Technical Details

AGC files are essentially uncompressed bitmap images. They store pixel data directly, often with a fixed color depth. The file structure is relatively simple, containing image dimensions, color information, and the raw pixel data. Some variations might include rudimentary header information for the Macintosh operating system to interpret the image.

Did You Know?

The AGC format was one of the earliest image formats developed for personal computers.
It predates more well-known graphic formats like JPEG and PNG by many years.

Security Information

AGC files are generally considered safe as they are simple bitmap images and do not typically contain executable code or complex scripting. However, as with any file from an unknown source, exercise caution.

Related Extensions