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Image MIME Reference
AVIF

AV1 Image File Format

image/avif
VS

FastBid Sheet

image/vnd.fastbidsheet
FastBid

A complete technical comparison of AV1 Image File Format and FastBid Sheet — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

AVIF wins on browser support

Feature Support

Feature AVIF FastBid
Transparency (Alpha) Yes ✕ No
Animation Support Yes ✕ No
Progressive Loading ✕ No ✕ No
HDR Support Yes ✕ No
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
AV1 Image File Format
image/avif
Extension
.avif
Container HEIF / ISOBMFF
Compression AV1 Lossy / AV1 Lossless
Algorithm
AV1
Color Depth 8-bit, 10-bit, 12-bit
Developed by Alliance for Open Media (AOMedia)
Released 2019
Magic Bytes
XX XX XX XX 66 74 79 70 61 76 69 66
Full AVIF reference →
FastBid Sheet
image/vnd.fastbidsheet
Extension
.fbs
Container Proprietary FastBid Container
Compression Proprietary
Algorithm
Unknown
Color Depth Unknown
Developed by FastBid, Inc. (Scott Becker)
Released Late 1990s
Magic Bytes
Unknown (Proprietary)
Full FastBid reference →

Browser Support Comparison

Browser AVIF FastBid
Chrome Chrome
✓ 85+
 ✕
Firefox Firefox
✓ 93+
 ✕
Safari Safari
✓ 16+
 ✕
Edge Edge
✓ 121+
 ✕
IE IE (Legacy)
✕ ✕
AVIF

AVIF Strengths

  • Best-in-class compression — typically 20–50% smaller than WebP at equivalent quality
  • Native HDR and wide color gamut (BT.2020) support
  • Supports 8, 10, and 12-bit color depth
Limitations
  • Encoding is highly CPU-intensive — significantly slower than JPEG or WebP
  • Requires Edge 121+ (not supported in earlier Edge versions)
  • Limited support in native desktop image viewers
FastBid

FastBid Strengths

  • Historically allowed the FastBid application to securely associate and load proprietary construction plans within its ecosystem
Limitations
  • Completely obsolete and unsupported in modern software environments
  • The official IANA registration of the .fbs extension causes widespread false positives, breaking modern parsers, text editors, and AI SDKs attempting to read FlatBuffers schemas

When to choose which format

AVIF
Use AVIF when…
  • Next-Gen Websites
  • HDR Photography
  • High-Quality Web Images
FastBid
Use FastBid when…
  • Legacy Construction Blueprints
  • FastBid Estimating Software
  • Causing .fbs MIME Type Conflicts (FlatBuffers)

More comparisons

AVIF vs ACES → FastBid vs ACES → AVIF vs APNG → FastBid vs APNG → AVIF vs AVCI → FastBid vs AVCI → AVIF vs AVCS → FastBid vs AVCS → All comparisons →
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