HEIC to AVIF converter: free, fast and secure
This free HEIC to AVIF converter turns your HEIC images into AVIF files in seconds, right in your browser. iPhone photos are saved as HEIC, which many Windows PCs, Android apps, websites and government portals cannot open. Converting to AVIF makes them work everywhere. AVIF gives the smallest file size of any common format, perfect for speeding up modern websites and online stores.
Unlike most converters, ConvertKaro never uploads your images. The conversion happens on your own device, so it is quicker, there are no file limits, and your photos stay private.
How to convert HEIC to AVIF in 3 steps
- Add your HEIC files. Tap “Select files” or drag and drop one or more .heic images into the box above. You can also paste a screenshot with Ctrl+V.
- Adjust the options. Set the quality slider. Lower quality means a smaller AVIF file.
- Download your AVIF. Conversion starts instantly. Download each AVIF file, or all of them at once as a ZIP.
Why use ConvertKaro HEIC to AVIF? Free, fast and secure
There are many HEIC to AVIF websites, but most of them upload your files, add watermarks or ask you to pay. Here is why this one is better.
100% Free
HEIC to AVIF on ConvertKaro costs nothing. There is no trial, no premium plan and no hidden limit, so you can use it as often as you like.
Fast results
Because nothing travels to a server, results appear almost instantly. Large files are limited only by the speed of your own phone or computer.
Secure and private
Nothing is uploaded. Sensitive files like Aadhaar, PAN, salary slips or contracts stay on your own phone or laptop the whole time.
No signup, no watermark
No account, no email and no watermark on your result. Open the page and start.
Works on every device
Designed for mobile first, so it works just as well on your phone as on a desktop computer.
Quality you control
A simple quality slider lets you choose between the smallest file and the best picture, with a sensible default already set.
ConvertKaro vs other online converters
| ConvertKaro | Typical online tool | |
|---|---|---|
| Price | Free forever, every feature | Free trial, then paid plans |
| Your files | Stay on your device | Uploaded to a server |
| Signup | Not needed | Often required |
| Watermark or ads on result | Never | Common on free plans |
| Speed | Instant, no upload wait | Depends on upload speed |
| Daily limits | None | Usually limited |
HEIC vs AVIF: what is the difference?
Both formats store images, but they are built for different jobs. Here is a quick comparison.
| HEIC | AVIF | |
|---|---|---|
| Full name | High Efficiency Image Container (HEIF) | AV1 Image File Format |
| Type | Raster, lossy | Raster, lossy or lossless |
| Compression | Lossy (HEVC) | Lossy and lossless (AV1) |
| Transparency | Yes | Yes |
| Animation | No | Yes |
| File size | Very small | Smallest |
| Support | Apple devices; limited on Windows, Android and websites | Chrome, Edge, Firefox, Safari 16+; few desktop apps |
| Best for | iPhone and iPad camera photos | High-performance websites, modern apps |
What is HEIC?
HEIC is the photo format iPhones and iPads use by default since iOS 11. It stores a photo in about half the space of a JPG with the same quality, which saves a lot of phone storage. Outside the Apple world, though, HEIC is a headache: many Windows PCs, Android apps, websites and government portals cannot open or accept it, so people convert HEIC photos to JPG or PNG before sharing.
What is AVIF?
AVIF is the newest mainstream image format, based on the AV1 video codec. It often makes files 30–50% smaller than JPG and noticeably smaller than WEBP at the same visual quality, with support for transparency, HDR and wide colour. Modern browsers display AVIF, but many desktop apps, older phones and upload forms still cannot open it.
When should you convert HEIC to AVIF?
- Hero images and banners on modern websites
- Image-heavy apps where every kilobyte counts
- Next-generation e-commerce catalogues
- Testing the best possible compression
Tips for the best AVIF results
- For websites, 75–85% quality is usually the best balance between size and sharpness.
- On iPhone you can also set Settings → Camera → Formats → “Most Compatible” to shoot JPG directly in future.
- You can convert many HEIC files at once. They are processed one after another and can be downloaded together as a ZIP.
- Keep your original HEIC files until you have checked the converted AVIF images.
How HEIC to AVIF keeps your photos and images private
Most online converters upload your file to their server, process it there and send it back. That costs time, uses your data pack and means a copy of your file sits on someone else’s computer. HEIC to AVIF works differently: the page loads the tool into your browser, and your photos and images are processed by your own phone or computer. The file never travels over the internet, so it cannot be leaked, stored or misused.
Using HEIC to AVIF on your phone
HEIC to AVIF is designed for small screens. Buttons are large, options are simple, and downloads save directly to your phone storage. On iPhone, downloaded files appear in the Files app under Downloads; on Android they go to the Downloads folder.
Who uses HEIC to AVIF?
Here are some of the people who find this tool most useful:
- Students uploading photos and signatures to exam and admission forms
- Online sellers preparing product photos for Instagram, Meesho, Amazon and Shopify
- Office staff handling ID cards, scans and screenshots
- Bloggers and web designers who need fast-loading images
- Anyone sharing pictures on WhatsApp, email or social media
Supported input: JPG, JPEG, PNG, WEBP, HEIC/HEIF (iPhone), AVIF, GIF, BMP, TIFF and SVG.
Frequently asked questions
Will converting HEIC to AVIF reduce quality?
AVIF stores the image lossy and lossless (av1), so no extra quality is lost during conversion. Any detail already removed by the original HEIC compression cannot be restored, and the AVIF file may be larger than the original.
Does AVIF keep transparency from HEIC?
Yes. AVIF supports transparency, so transparent areas in your HEIC stay transparent.
Can I convert multiple HEIC files to AVIF at once?
Yes. Select or drop as many HEIC images as you like. Each one is converted separately, and you can download them all together as a ZIP file.
Why can’t I open HEIC photos on Windows?
Windows needs a paid HEVC extension to read HEIC, and many apps do not support it at all. Converting to JPG or PNG is the simplest fix and works on every device.
Is HEIC to AVIF really free?
Yes. HEIC to AVIF on ConvertKaro is 100% free with no limits, no signup and no watermark. There is no paid version.
Is it safe to use HEIC to AVIF online?
It is one of the safest ways to do it, because nothing is uploaded. All processing happens locally on your device, and the files disappear when you close the page.
Does HEIC to AVIF work on mobile?
Yes. It works in Chrome and Safari on Android phones and iPhones, as well as on tablets and computers. No app is needed.
Is there a file size limit in HEIC to AVIF?
No upload means no server limit. The only limit is your device’s memory, which comfortably handles everyday files and even large batches.
Will ConvertKaro add a watermark or ask me to sign up?
No. There is no watermark, no login and no email required. Your downloaded file is exactly your result.
Does HEIC to AVIF work offline?
Once this page has finished loading, the tool keeps working even if your internet connection drops, because all processing happens on your device.