CONVERT
MIFF → AVIF
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Fast, secure MIFF to AVIF conversion. No registration required.
MIFF is a raster image format with its own balance of compression, colour depth, and software support. Reaching a AVIF from there is one hop. A MIFF to AVIF conversion is almost always about making an image land cleanly in another piece of software. ImageMagick MIFF is well-suited to its original niche, but AVIF Image opens on more platforms or fits better into a publishing pipeline. Upload a MIFF file above, pick any quality knobs, and download a ready-to-use AVIF. Keep in mind MIFF is a raster image format with its own balance of compression, colour depth, and software support. And remember that AVIF is the AV1-based next-gen image codec, extremely efficient with full HDR and alpha support.
ImageMagick MIFF
Source 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.
AVIF Image
Target 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.
Why convert MIFF to AVIF
Converting keeps the picture recognisable end-to-end while changing the container that ships it. AVIF typically wins on one of three fronts: broader software support, smaller files for the same visual quality, or features like transparency that MIFF cannot express. The conversion itself is fast because both sides are raster formats.
HOW TO CONVERT
MIFF → AVIF
Upload your MIFF
Start by dropping the MIFF 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 MIFF pixel grid, preserves resolution and colour profile, and encodes a clean AVIF.
Grab the result
A download button appears as soon as the AVIF is ready. Save locally or share the short-lived URL.
Common Use Cases
Cross-platform previews
Windows, macOS and Linux file browsers all render AVIF thumbnails; MIFF support varies by OS version.
Mobile galleries
iOS Photos, Google Photos and Samsung Gallery index AVIF instantly — MIFF sometimes falls back to a generic file icon.
Stock photography uploads
Shutterstock, Adobe Stock and similar marketplaces require AVIF in their contributor guidelines.
Archive migration
Converting legacy MIFF archives to AVIF future-proofs the collection against declining codec support.
MIFF vs AVIF — Strengths and limitations
What each format does best, and where it falls short.
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 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 vs AVIF — Technical specifications
Side-by-side comparison of the technical details.
MIFF
- MIME type
- image/x-miff
- Extension
- .miff
- Native tool
- ImageMagick
- Bit depths
- Any (ImageMagick-supported)
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
| Specification | MIFF | AVIF |
|---|---|---|
| MIME type | image/x-miff | image/avif |
| Extension | .miff | — |
| Native tool | ImageMagick | — |
| Bit depths | Any (ImageMagick-supported) | — |
| 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 vs AVIF — Typical file sizes
Approximate file sizes for common scenarios.
MIFF
- 1920×1080 8-bit MIFF ~6 MB
- 1920×1080 32-bit float ~25 MB
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
Quality & Compatibility
Converting keeps resolution, aspect ratio and colour profile identical to the source. Metadata (EXIF, XMP) transfers where AVIF supports it; otherwise it is dropped. If the MIFF contained an alpha channel and AVIF 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 AVIF at 2× the CSS pixel size; the crispness gap over 1× is noticeable on modern screens.
- Strip EXIF metadata from the AVIF before publishing if the MIFF came from a phone camera — it often contains GPS coordinates and device IDs.
- If the MIFF is a screenshot of text or UI, prefer a lossless AVIF target to avoid the JPEG-style ringing around glyph edges.
Frequently Asked Questions
It depends on the codecs involved. If both MIFF and AVIF are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If AVIF is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded MIFF exactly, but cannot recover detail that MIFF had already compressed away.
Often yes, especially when AVIF is lossless. MIFF tuned for efficient web delivery will usually produce smaller files than AVIF'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.