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Convert HEIC to AVIF Online — Next-Gen Web Format

50–70% smaller than JPG with richer colors and next-gen quality.

Drop up to 50 photos at once — no install, no sign-up required.

Drop HEIC Files Here

25 MB per file Up to 50 files 3 parallel conversions 1 credit each

Encrypted EU Servers Auto-delete 1h

⚡ Median HEIC → AVIF time (last 10k jobs): 4.7s

How it works

  1. 1 · Drop your files

    Drag & drop or choose HEIC files. No account required on Free—paid plans unlock bigger batches, higher limits, and priority queues.

  2. 2 · We convert securely

    Processed on our dedicated servers. Encrypted in transit & at rest. Metadata stripped by default. We never store filenames—only file types & sizes for accounting. We never train AI models on uploads.

  3. 3 · Download & auto-delete

    Grab your AVIF files in seconds. Files delete automatically after 1 hour. Delete anytime after downloading with one click.

About HEIC →

HEIC (High Efficiency Image Container) uses HEVC/H.265 compression to deliver 40–50% smaller file sizes compared to JPEG at equivalent visual quality. Standardized by MPEG in 2015 and adopted by Apple in iOS 11 (2017), HEIC supports 8–10-bit color depth, HDR metadata, and image sequences. Files store efficiently but require modern decoders—native support is limited to iOS 11+, macOS High Sierra+, Android 10+, and Windows with extensions.

Learn more: HEIF on Wikipedia

HEIC is ideal for iPhone users who want maximum storage efficiency without visible quality loss. While Apple devices handle HEIC natively, sharing with Windows PCs or older Android devices often requires conversion for compatibility.

About AVIF →

AVIF (AV1 Image File Format) leverages the AV1 video codec to deliver next-generation compression—typically 50% smaller than JPEG at equivalent quality, with support for HDR, wide color gamut, and both lossy and lossless compression. Standardized by the Alliance for Open Media in 2019, AVIF offers 10-bit and 12-bit color depth plus full alpha transparency. Encoding is slower than JPEG or WebP, but visual quality per byte is exceptional.

Authoritative reference: AVIF Specification (AOMedia)

AVIF is ideal for modern web delivery where cutting-edge compression and HDR support matter. Browser adoption reached critical mass in 2021-2023, with Chrome 85+, Firefox 93+, and Safari 16.4+ now supporting AVIF natively. Encoding is 2-3× slower than WebP, but the compression gains typically justify the extra CPU time for server-side batch processing. For maximum compatibility, serve AVIF with WebP and JPG fallbacks using <picture> elements.

Frequently Asked Questions

Why does my iPhone save photos as HEIC?

Apple switched iPhones to HEIC in iOS 11 (September 2017) to save storage space. HEIC files are 40–50% smaller than equivalent JPEGs while maintaining the same visual quality. This affects iPhone 7 and newer models. When sharing via iMessage, email, or AirDrop to non-Apple devices, iOS automatically converts to JPG. Problems arise when transferring directly via USB or cloud sync.

Why choose AVIF over JPG for HEIC photos?

AVIF delivers 25–35% smaller files than JPG at similar quality, preserves transparency (which JPG can't), and supports wider color gamuts. Perfect for web publishing where bandwidth and page speed matter. Need maximum compatibility with older software or devices? Try our HEIC to JPG converter instead—JPG works everywhere.

Is AVIF supported in all browsers?

Yes, with fallback. AVIF is supported by 92% of global browsers as of 2025:

  • Chrome: 85+ (September 2020)
  • Firefox: 93+ (October 2021)
  • Safari: 16.4+ (March 2023) — macOS 13+ and iOS 16.4+
  • Edge: 121+ (January 2024)

Not supported: Internet Explorer, Safari 15 and earlier, older Android browsers. Always use the <picture> element with WebP or JPEG fallback for production.

Is HEIC to AVIF a lossy or lossless conversion?

Lossy by default. We use AVIF's lossy mode at quality 75 (visually equivalent to JPEG quality 90 in perceptual quality tests) to balance file size and visual quality. This is a decode + re-encode workflow, so you're applying compression twice (HEIC encoding + AVIF encoding). For pixel-perfect archiving, use our HEIC to PNG converter instead (files will be larger, but quality is preserved perfectly).

How much smaller will my AVIF files be compared to HEIC?

Results vary by content, but AVIF typically achieves comparable or slightly better compression than HEIC. The key benefits of AVIF over HEIC are universal browser support (~93% globally) and wider color gamut support. Compared to JPG, AVIF is typically 25–35% smaller at similar quality—making it excellent for web delivery.

What happens to photo metadata and transparency?

We apply orientation so the AVIF displays correctly, then strip metadata & GPS by default for privacy and smaller files. Transparency is preserved (AVIF supports alpha channels). Only the primary still frame converts—Live Photo motion, depth maps, and HDR metadata aren't retained.

Can I convert Live Photos or HEIC bursts?

Yes, but only the primary still frame converts. HEIC files can contain multiple types of data:

  • Live Photos: Motion video discarded; only the still frame converts to AVIF
  • Burst sequences: Each HEIC file converts individually; the burst relationship isn't preserved
  • HDR metadata: Wide color gamut converted to 8-bit sRGB (AVIF supports HDR but we use 8-bit encoding for compatibility)
  • Depth maps: Portrait mode depth data discarded (not commonly preserved in AVIF workflows)

What IS preserved:

  • Image quality: High-fidelity AVIF encoding with excellent compression
  • Orientation: Photos display right-side-up automatically
  • Transparency: Alpha channels preserved (if present)

How do batch conversions work?

Drag & drop multiple files or use the file picker to select up to 50 files (Guest), 50 files (Free), 200 files (Pro), or 1000 files (Business) at once. Here's what happens:

  • Upload in parallel: All files upload simultaneously for speed
  • Queue automatically: Files enter the conversion queue immediately
  • Process concurrently: Up to 3 (Guest), 3 (Free), 6 (Pro), or 10 (Business) files process at once
  • Track progress live: Real-time status updates for each file
  • Download individually or all at once: Grab files as they finish or wait for the batch ZIP

Tips for large batches:

  • Keep your browser tab open until all files complete (conversions continue server-side, but you need the tab to download)
  • Pro and Business tiers get higher concurrency limits for faster batch processing
  • If a single file fails, the rest of your batch continues processing

What are the limits for this converter?

TierMax File SizeMax Files/BatchParallel Processing
Free25 MB50 files3 at once
Pro200 MB200 files6 at once
Business1024 MB1000 files10 at once

Note: File size limits are specific to this converter. Batch and parallel processing limits apply to all images converters site-wide. See all converter limits →

How are credits calculated for this conversion?

Cost: 1 credit per 25 MB

How it works:

  • Files up to 25 MB: 1 credit (minimum)
  • 26-50 MB: 2 credits
  • 51-75 MB: 3 credits
  • 76-100 MB: 4 credits
  • Over 1000 MB: 40 credits (maximum cap)

Example: A 5 MB photo = 1 credit. A 95 MB photo = 4 credits.

Why per-megabyte? Larger files require more resources (processing, bandwidth, storage).

What are my daily and monthly credit limits?

Credit allocations vary by account tier:

TierDaily LimitMonthly Limit
Free50 credits/day—
Pro—10,000 credits/month
Business—30,000 credits/month

Daily credits (Free tier, including guests) reset every day at midnight UTC. Monthly credits (Pro & Business) reset on your billing cycle date.

Note: With 1 credit per 25 MB, iPhone photos under 25 MB cost 1 credit each. Pro users can convert 10,000 iPhone photos per month.

Answers at a Glance

Quick answers to common questions.

Choose Your Plan

Limits shown for HEIC to AVIF conversion. One subscription unlocks the entire Tools.FAST Network. Plans cover Convert.FAST, Compress.FAST, PDF.FAST (soon), and all future tools.

Monthly Annual 4 Months Free

Free

$0

For occasional personal use

  • 25 MB per file
  • 50 files per batch
  • 3 parallel conversions
  • 50 credits/day
  • Standard priority
  • Email support
Sign Up Free

No sign-up required. Create an account for your own credit pool.

Popular

Pro

$9 /month

For independent work

  • 200 MB per file
  • 200 files per batch
  • 6 parallel conversions
  • 10,000 credits/month across Tools.FAST
  • High priority
  • Email & chat support
  • One subscription for the entire Tools.FAST network

Business

$19 /month

1 seat

For production scale

  • 1 GB per file
  • 1000 files per batch
  • 10 parallel conversions
  • 30,000 credits/month across Tools.FAST
  • Add seats to invite team members
  • Highest priority
  • Priority email & chat support
  • One subscription for the entire Tools.FAST network

How Credits Work

  • Usually 1 credit per conversion. Exact cost shown before you start.
  • Credits refresh monthly on your billing cycle.
  • Unused credits roll over, capped at your plan's monthly amount.
  • One subscription, all sites. Works across Convert.FAST, Compress.FAST, and future tools.
View all converter limits by tier →

What's New in HEIC to AVIF

Latest improvements to this converter

Last updated November 7, 2025
Nov 7, 2025

Initial release of HEIC to AVIF converter. Convert iPhone photos to next-generation AVIF format with 50–70% smaller files than JPG, maximum AV1 compression. Encoding takes 5-10 seconds per image but achieves smallest possible file sizes.