HEIF to AVIF conversion is the process of re-encoding image files stored in the High Efficiency Image File (HEIF) container into AV1 Image File Format (AVIF) images. This conversion transfers image data (single images or image sequences) from a HEIF/HEIC-encoded HEVC-based or other codec-based container into AVIF’s AV1-based encoding to improve compression efficiency, compatibility, or web delivery.
Related guides
Practical guides to help you choose formats, preserve quality, and avoid common conversion problems.
WebP has quietly become the default image format of the modern web, delivering 25-35% smaller files than JPG and PNG with universal browser support. This 2026 guide covers current adoption stats, browser compatibility, WordPress integration, conversion workflows, and when to choose WebP over AVIF for optimal Core Web Vitals performance.
Read guide →Not sure whether to save your image as PNG or JPG? This detailed comparison covers compression, transparency, file size, web performance, and real-world use cases so you can pick the right format every time — with conversion links when you need to switch.
Read guide →Learn how to convert HEIC to JPG for maximum compatibility. This guide explains what HEIC is, why iPhones use it, the key differences between HEIC and JPG, and walks through every conversion method including online tools, iPhone settings, Windows, and Mac.
Read guide →Drag your .HEIF file from your computer or use the browse function.
Confirm .avif as the selected destination format.
Click "Convert" and download your converted .AVIF file once ready.
HEIF files use the MIME type image/heif and typically employ the HEVC codec for compression. AVIF files use the MIME type image/avif and rely on the AV1 codec, known for superior compression efficiency. HEIF is common in photography and mobile devices, whereas AVIF is gaining traction for web use due to its open standard and royalty-free licensing.
The AVIF (.AVIF) format is commonly used for image. Understanding its characteristics can be helpful when converting to or from other formats like HEIF.
While specific technical details aren't available here, AVIF files generally serve the purpose of storing image effectively within their domain.
Our Online HEIF to AVIF Converter provides a fast, reliable, and free solution to convert your HEIF images into the highly efficient AVIF format. Designed for photographers, designers, and everyday users, this tool enhances image compression while maintaining quality. Experience seamless conversion without installing software or compromising on speed.
HEIF and AVIF are both modern image formats focused on efficient compression. While HEIF is widely used primarily in Apple devices, AVIF provides better compression and broader compatibility across browsers and devices. AVIF is considered the next-generation format offering enhanced features and improved performance over HEIF.
Keep target file sizes moderate: for web use aim for 50–200 KB for typical 12MP images; use higher sizes for detailed photography to preserve detail.
Preserve quality: convert using lossless or high-quality settings (low CRF / high quality preset) when archiving or when images will be edited further; use chroma subsampling awareness for color-critical work.
Batch conversion advice: process large batches with a command-line tool or server-side encoder that supports parallel jobs and preserves filenames/metadata; test one representative image first.
Format-specific limitations: AVIF decoding support varies across browsers and older devices — provide fallback JPEG/PNG for maximum compatibility; some HEIF variants may contain proprietary codecs not supported by every converter.
Love this tool! It made converting HEIF files to AVIF effortless and fast.
Sarah T.
Designer
The quality retention during conversion was impressive. Highly recommend this HEIF converter.
Mike R.
Photographer
This online converter improved my workflow and optimized images for the web perfectly.
Linda K.
Web Developer
Start your free HEIF to AVIF conversion now.
Drag your file here to to upload.
Up to 250MB
Metadata & alpha: not all converters preserve all EXIF/XMP fields or layered/auxiliary images in HEIF, so verify metadata preservation if it matters.