AVIF vs MIFF
A detailed comparison of AVIF Image and ImageMagick MIFF — file size, quality, compatibility, and which format to choose for your workflow.
AVIF Image
Raster & Vector ImagesAVIF is a next-generation image format based on the AV1 video codec. It offers significantly better compression than JPEG and WebP while maintaining excellent visual quality, including HDR and wide color gamut support.
About AVIF filesImageMagick MIFF
Raster & Vector ImagesMIFF (Magick Image File Format) is the native format of ImageMagick, supporting all of its internal features including multiple image layers, color profiles, and arbitrary metadata. It serves as a lossless interchange format within ImageMagick processing chains.
About MIFF filesStrengths Comparison
AVIF Strengths
- Best-in-class compression efficiency — 30-50% smaller than JPEG for the same quality.
- Royalty-free and patent-unencumbered (unlike HEIC).
- Supports alpha transparency, HDR, wide gamut (BT.2020), and up to 12-bit color.
- Progressive decoding: a blurry preview appears while the file is still downloading.
- Supported in all major browsers since late 2022 — no polyfills needed.
MIFF Strengths
- Preserves ImageMagick's full fidelity.
- Arbitrary bit depth + color profile.
- Streaming pipeline intermediate.
Limitations
AVIF Limitations
- Encoding is CPU-expensive — an AVIF export can take 10-30× longer than JPEG.
- Older software (pre-2022) cannot open AVIF without plugins.
- Email clients still largely ignore it — stick to JPEG for attachments.
- Metadata support (EXIF, XMP) exists but tooling is less mature than for JPEG.
MIFF Limitations
- ImageMagick-only.
- Not a delivery format.
- Large files.
Technical Specifications
| Specification | AVIF | MIFF |
|---|---|---|
| MIME type | image/avif | image/x-miff |
| Container | HEIF (ISOBMFF) | — |
| Codec | AV1 (intra-only) | — |
| Max dimensions | 65 536 × 65 536 px | — |
| Color depth | Up to 12-bit per channel | — |
| Color spaces | sRGB, Display-P3, BT.2020, arbitrary ICC | — |
| Extension | — | .miff |
| Native tool | — | ImageMagick |
| Bit depths | — | Any (ImageMagick-supported) |
Typical File Sizes
AVIF
- Thumbnail (400px) 10-30 KB
- Web photo (1920px) 80-300 KB
- 4K photo (3840px) 300 KB - 1.2 MB
- Lossless copy of 24MP photo 8-15 MB
MIFF
- 1920×1080 8-bit MIFF ~6 MB
- 1920×1080 32-bit float ~25 MB
Ready to convert?
Convert between AVIF and MIFF online, free, and without installing anything. Encrypted upload, automatic deletion after 2 hours.
Frequently Asked Questions
AVIF (AV1 Image File Format) is a cutting-edge image format derived from the AV1 video codec, backed by the Alliance for Open Media. It delivers up to 50% smaller files than JPEG with equal or better visual quality, plus HDR and transparency support.
MIFF (ImageMagick MIFF) is an image format used to store raster graphics — a two-dimensional grid of pixels describing a picture. It is part of the raster & vector images family and designed around a specific trade-off between file size, visual fidelity, and feature support (transparency, colour depth, compression type). Photographers, web designers, and content creators choose MIFF when its particular strengths match the publishing target.
AVIF files open in Chrome, Firefox, Safari (from macOS Ventura), Edge, and GIMP 2.10+. Support is growing rapidly, but some older image editors may not yet handle AVIF natively.
Most desktop photo viewers (Windows Photos, macOS Preview, GIMP, Photoshop, Affinity Photo) open MIFF natively. On mobile, iOS Photos and Google Photos display MIFF in the gallery when supported by the OS. If the format is rare or new, convert to JPG or PNG first — both are universally readable — using our MIFF to JPG or MIFF to PNG converter.
AVIF provides better compression and quality than WebP, especially for photographs. However, WebP has broader software support today. Use AVIF for maximum performance on modern browsers and WebP as a reliable fallback.
Upload the MIFF to KaijuConverter and pick a target format (JPG, PNG, WebP, HEIC, TIFF, BMP, SVG, PDF). The conversion runs in the browser via ImageMagick and returns a download in seconds. No account or installation required; both input and output delete automatically within two hours.