CONVERT
AVIF → MIFF
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Fast, secure AVIF to MIFF conversion. No registration required.
Setup: AVIF is the AV1-based next-gen image codec, extremely efficient with full HDR and alpha support. Goal: an interchangeable MIFF. A AVIF to MIFF conversion is almost always about making an image land cleanly in another piece of software. AVIF Image is well-suited to its original niche, but ImageMagick MIFF opens on more platforms or fits better into a publishing pipeline. Upload a AVIF file above, pick any quality knobs, and download a ready-to-use MIFF. Worth knowing: AVIF is the AV1-based next-gen image codec, extremely efficient with full HDR and alpha support. Meanwhile MIFF is a raster image format with its own balance of compression, colour depth, and software support.
AVIF Image
Source formatAVIF 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.
ImageMagick MIFF
Target formatMIFF (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.
Why convert AVIF to MIFF
Converting keeps the picture recognisable end-to-end while changing the container that ships it. MIFF typically wins on one of three fronts: broader software support, smaller files for the same visual quality, or features like transparency that AVIF cannot express. The conversion itself is fast because both sides are raster formats.
HOW TO CONVERT
AVIF → MIFF
Upload your AVIF
Start by dropping the AVIF onto the uploader. Files up to 100 MB go through on the free tier without registration.
Conversion happens server-side
Our imagemagick-based pipeline reads the AVIF pixel grid, preserves resolution and colour profile, and encodes a clean MIFF.
Grab the result
A download button appears as soon as the MIFF is ready. Save locally or share the short-lived URL.
Common Use Cases
Cross-platform previews
Windows, macOS and Linux file browsers all render MIFF thumbnails; AVIF support varies by OS version.
Mobile galleries
iOS Photos, Google Photos and Samsung Gallery index MIFF instantly — AVIF sometimes falls back to a generic file icon.
Stock photography uploads
Shutterstock, Adobe Stock and similar marketplaces require MIFF in their contributor guidelines.
Archive migration
Converting legacy AVIF archives to MIFF future-proofs the collection against declining codec support.
AVIF vs MIFF — Strengths and limitations
What each format does best, and where it falls short.
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.
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.
MIFF Strengths
- Preserves ImageMagick's full fidelity.
- Arbitrary bit depth + color profile.
- Streaming pipeline intermediate.
Limitations
- ImageMagick-only.
- Not a delivery format.
- Large files.
AVIF vs MIFF — Technical specifications
Side-by-side comparison of the technical details.
AVIF
- MIME type
- image/avif
- 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
MIFF
- MIME type
- image/x-miff
- Extension
- .miff
- Native tool
- ImageMagick
- Bit depths
- Any (ImageMagick-supported)
| 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) |
AVIF vs MIFF — Typical file sizes
Approximate file sizes for common scenarios.
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
Quality & Compatibility
Converting keeps resolution, aspect ratio and colour profile identical to the source. Metadata (EXIF, XMP) transfers where MIFF supports it; otherwise it is dropped. If the AVIF contained an alpha channel and MIFF does not support transparency, the background is flattened to white by default.
Tips for Best Results
- When uploading to Retina / high-DPI contexts, render the MIFF at 2× the CSS pixel size; the crispness gap over 1× is noticeable on modern screens.
- Strip EXIF metadata from the MIFF before publishing if the AVIF came from a phone camera — it often contains GPS coordinates and device IDs.
- If the AVIF is a screenshot of text or UI, prefer a lossless MIFF target to avoid the JPEG-style ringing around glyph edges.
Frequently Asked Questions
It depends on the codecs involved. If both AVIF and MIFF are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If MIFF is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded AVIF exactly, but cannot recover detail that AVIF had already compressed away.
Often yes, especially when MIFF is lossless. AVIF tuned for efficient web delivery will usually produce smaller files than MIFF's default settings. If file size matters, drop the quality in Advanced or pick a more compressed target format instead.
KaijuConverter uploads over HTTPS, processes the image in an isolated container and deletes both the source and the output within two hours. No account is required, file contents are never logged, and we do not use uploads to train any model. For confidential material, the paid plan includes a data-processing agreement.
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Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.