HEIC, HEIF and AVIF Info Viewer
Drop in a HEIC, HEIF, or AVIF file to see how the container is built. The tool reads the ftyp box to show the major brand and compatible brands, walks the top-level ISO-BMFF boxes (meta, mdat, moov and more), and reports the image dimensions when it can find them. The file is parsed entirely in your browser and never leaves your device.
How to inspect a HEIC or AVIF file
- Drag a .heic, .heif, or .avif file onto the box, or click to browse.
- Read the detected format, brands, and pixel dimensions at the top.
- Scan the box list to see the ftyp, meta, and mdat structure inside.
Examples
An iPhone photo
IMG_5099.heic (a photo from a recent iPhone)
HEIC, major brand heic, compatible mif1/heic, 4032 x 3024
Frequently asked questions
Is my file uploaded anywhere?
No. The file is read and parsed entirely in your browser using JavaScript. Nothing is sent to a server, so private photos stay on your device.
What is HEIC?
HEIC (High Efficiency Image Container) is the format Apple uses for photos since iOS 11. It wraps HEVC-compressed images in an ISO Base Media File Format container, the same box structure used by HEIF and AVIF, which is why this tool can read all three.
Can it convert HEIC to JPEG or PNG?
No. This tool only inspects the file, it does not convert it. It reads the container brands, box layout, and dimensions so you can understand what the file contains, without decoding or re-encoding any pixels.
What is the difference between HEIC, HEIF, and AVIF?
All three share the ISO-BMFF container. HEIF is the umbrella format (brand mif1); HEIC is the HEVC-coded variant Apple uses (brand heic); AVIF stores AV1-coded images (brand avif). The major and compatible brands in the ftyp box are how the tool tells them apart.
Why does it show width and height for some files but not others?
Dimensions come from an ispe (image spatial extents) box nested inside the meta box. Reading it is best effort: most still images include one, but some sequences or unusual files do not, in which case the dimensions are left blank.
What are major and compatible brands?
The ftyp box at the start of the file lists a major brand (the format the file was authored as) and a set of compatible brands (other specs the file conforms to). Together they identify whether you are looking at HEIC, HEIF, or AVIF.
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