SVF

Simple Vector Format

image/vnd.svf Released 1995 · by SoftSource & NCSA (National Center for Supercomputing Applications)

The image/vnd.svf MIME type officially represents the Simple Vector Format, an early 2D vector graphics format co-developed in 1995 by SoftSource and the National Center for Supercomputing Applications (NCSA). It was one of the first concerted efforts to bring scalable vector graphics (like CAD blueprints and schematics) to the World Wide Web, requiring a browser plugin to view. Ultimately, W3C's SVG (Scalable Vector Graphics) won the standards war, rendering this original SVF format obsolete. Note: Modern developers often encounter the '.svf' extension in relation to Autodesk's 'Simple Viewing Format' (used in Autodesk Platform Services / Forge), which is an entirely different, ZIP-based 3D/2D web viewing format that happens to share the same acronym and extension.

CAD & Legacy Vectors Transparency Production Ready

Technical Specifications

MIME Type

image/vnd.svf

Extensions

.svf

Container

Custom Binary/Text (Legacy) or ZIP (Autodesk Forge)

Compression

Uncompressed & Deflate (in modern Autodesk SVF implementations)

Algorithms

None

Color Depth

Vector Data (Not Applicable)

Metadata

None

Capabilities

Transparency

Animation

Progressive Loading

Alpha Channel

HDR Support

Official Specification

Aliases: application/x-svf

Magic Bytes & HTTP Headers

File Signature (Magic Bytes)

Unknown (SoftSource SVF)

ASCII: Unknown

HTTP Headers

Content-Type: image/vnd.svf

HTML Accept Attribute

accept="None"

Browser Support Matrix

Browser	Status	Min Version
Chrome	Not Supported	—
Firefox	Not Supported	—
Safari	Not Supported	—
Edge	Not Supported	—
Internet Explorer	Not Supported	Legacy

Advantages & Limitations

Advantages

Acted as a crucial pioneering stepping-stone in proving that scalable, zoomable vector graphics were viable and necessary for the World Wide Web

Limitations

Completely obsolete and unsupported by modern web standards
Required end-users to install bulky, proprietary browser plugins
Causes significant developer confusion today due to Autodesk adopting the exact same acronym and file extension for a completely different technology

Developer Code Snippets

import magic
# Libmagic lacks definitions for historical SoftSource SVF.
# If it's an Autodesk Forge SVF, it will be detected as a ZIP file.
print(magic.from_file('drawing.svf', mime=True)) # May output 'application/zip' or 'application/octet-stream'

const mime = require('mime');
// Many JS MIME libraries map .svf to image/vnd.svf purely based on the historical IANA registry string match
console.log(mime.getType('drawing.svf')); // Likely outputs 'image/vnd.svf'

import "net/http"
// The standard net/http library cannot detect historical SVF. Autodesk SVF will be detected as 'application/zip'.

$mime = mime_content_type('drawing.svf');
echo $mime; // Standard server environments will map this to application/octet-stream or application/zip

File Detection Steps

How to programmatically detect a image/vnd.svf file by reading its raw bytes:

1 If the file is a legacy SoftSource SVF, it lacks a universally recognized standard magic byte in modern sniffers.
2 If the file is a modern Autodesk Forge SVF, it is actually a ZIP archive, meaning its first 4 bytes will be the standard ZIP magic number: 50 4B 03 04 (PK\x03\x04).

Software Support

S

SoftSource SVF Plug-in (Legacy)

A

Autodesk Forge Viewer (For the modern Autodesk SVF format)

Conversion Tools

Share & Embed

Markdown Badge

[![SVF Format](https://freewebptojpg.com/mime/image/svf/badge.svg)](https://freewebptojpg.com/mime/image/svf)

Interactive iframe Widget

<iframe src="https://freewebptojpg.com/mime/image/svf/embed" width="100%" height="280" style="border:1px solid #cbd5e1;border-radius:8px;" title="SVF 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/svf.json Open JSON

Free to use

No auth required

CORS enabled

Use from any domain

Cached 24h

Cache-Control headers set

Frequently Asked Questions

What is a Simple Vector Format (SVF) file?

Historically, an SVF file is an early web-based 2D vector graphic format created in 1995 by SoftSource. It was designed to display CAD drawings and schematics in web browsers via a specialized plugin before standard formats like SVG existed.

What is the difference between SVF and SVG?

SVF (Simple Vector Format) was a mid-1990s proprietary attempt at web vector graphics that ultimately failed to gain universal adoption. SVG (Scalable Vector Graphics) is the open XML-based W3C standard that succeeded it and is natively supported by all modern web browsers.

Does this MIME type apply to Autodesk Forge SVF files?

Technically, no. The official IANA registration for image/vnd.svf belongs to the 1995 SoftSource format. Autodesk's modern 'Simple Viewing Format' (also using the .svf extension) used in the Autodesk Forge/APS viewer is actually a packaged ZIP container holding JSON metadata, 3D meshes, and textures. However, some web servers might lazily map Autodesk .svf files to this legacy MIME type.