Format & Conversion

HEIC to AVIF

Convert HEIC images to AVIF. HEIC is built for iPhone camera rolls, and very little outside Apple's ecosystem; AVIF for the web, where it generally beats both JPEG and WebP on size at matched quality. Both formats are lossy, so this is a re-encode and a little detail goes each time. Start from the best source you have rather than chaining conversions. Runs on your own Vistalyth Tools instance. Files never reach a third party.

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Features

  • Quality control over the AVIF encode, so you choose the size-versus-detail point
  • Batch conversion across a folder of HEIC files
  • Metadata and colour profile carried over wherever AVIF can hold them
  • Your HEIC files are processed on your own server and never uploaded anywhere

What you can do

  • Open iPhone photos in software that has never heard of HEIC
  • Batch a folder of HEIC files into AVIF in one pass
  • Satisfy an upload form or pipeline that takes AVIF and rejects HEIC

Self-hosted. Your files never leave your network.

Vistalyth Tools runs entirely on your own infrastructure. Files processed with HEIC to AVIF are never uploaded to third-party servers. Deploy a single Docker container and process files with full privacy, no watermarks, and no usage limits. Open source under AGPL-3.0.

Frequently asked questions

Will converting HEIC to AVIF lose quality?
Convert once from the best original you have. Chaining conversions is what visibly degrades an image, not any single hop.
Which quality setting should I use?
Start at the default, then lower it until you can see the difference at the size the image is actually viewed. Most photographs hold up further down than people expect.
Can I go back to HEIC afterwards?
You can convert back, but you will not recover the original. HEIC discarded detail when it was first written, and AVIF cannot invent it. Keep the source file if you might need it.

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