AirZip Accelerator Image
image/vnd.airzip.accelerator.azv
Released 1999
· by AirZip, Inc.
The image/vnd.airzip.accelerator.azv MIME type represents a proprietary image format developed by AirZip, Inc. for their Web Accelerator software. Popular during the dial-up internet era (late 1990s to early 2000s), it heavily compressed standard web images (like JPEG and GIF) on the fly via a proxy server to dramatically speed up page loading times for low-bandwidth users.
Technical Specifications
.azv
AirZip Proprietary Compression
Magic Bytes & HTTP Headers
Unknown
Browser Support Matrix
| Browser | Status | Min Version |
|---|---|---|
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Not Supported | — |
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Not Supported | — |
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Not Supported | — |
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Not Supported | — |
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Not Supported | Legacy |
Advantages & Limitations
- Historically allowed internet users to browse the web up to 5x faster over 56k dial-up modems by drastically reducing image payload sizes
- Officially registered in the IANA vendor tree, preventing MIME type conflicts on early web proxy servers
- Completely obsolete in the modern broadband era
- Closed-source and proprietary, meaning no modern image manipulation libraries (like ImageMagick or libvips) can decode it
- Zero support in standard web browsers
Developer Code Snippets
File Detection Steps
How to programmatically detect a image/vnd.airzip.accelerator.azv
file by reading its raw bytes:
- 1 Due to its proprietary nature and obscurity, file detection relies almost entirely on the .azv file extension or examining the HTTP Content-Type header from legacy server logs.
Software Support
Share & Embed
[](https://freewebptojpg.com/mime/image/azv)
<iframe src="https://freewebptojpg.com/mime/image/azv/embed" width="100%" height="280" style="border:1px solid #cbd5e1;border-radius:8px;" title="AZV Specs"></iframe>
JSON API
All data on this page is available as a free, open JSON API. Use it in your project, documentation, or tooling.
GET https://freewebptojpg.com/mime/image/azv.json
Open JSON
Frequently Asked Questions
What is an AZV file?
An AZV file is a proprietary compressed image generated by the legacy AirZip Web Accelerator. A proxy server would intercept standard web images, compress them into the AZV format, and send them to the user's AirZip client software to decode, saving bandwidth over slow dial-up connections.
Can I open an image/vnd.airzip.accelerator.azv file today?
No modern web browsers or image viewers support the AZV format natively. Opening it would require the original, obsolete AirZip Web Accelerator client software running on a legacy operating system.
Why does the MIME type start with 'vnd.'?
The 'vnd.' prefix indicates that this is a vendor-specific MIME type officially registered with IANA by a commercial entity (AirZip, Inc.). It ensures that their proprietary software could handle these files without conflicting with standard web MIME types.