AVIF Converter. · macOS · Blazing fast · 100% offline
Effortless
AVIF Converter. is a free macOS app that bulk-converts PNG, JPG, HEIC, and WebP to AVIF — entirely on your Mac. AVIF is about 50% smaller than JPEG, with HDR, wide gamut, 10/12-bit depth, transparency, and animation. Convert, resize, optimize, and watermark whole folders in a single pass.
Drop a folder
or images. Done.
Bulk in, bulk out
Instant
AVIF Conversion
HDR · 10/12-bit · Alpha · Animation
100% on your Mac
No upload · No account
Fast, native, secure
Apple Silicon-optimized
Free to download
macOS 12+ · Apple Silicon native · 100% local processing
Three steps, done
Batch converting PNG, JPG, HEIC, or WebP to AVIF on a Mac takes three steps: drop your images, check the quality, and hit Start.
Drop your images
Drag PNG, JPG, HEIC, or WebP from Finder. Or right-click and choose Services > "AVIF Converter".
Check quality
Compare before/after sizes in the UI. HDR and 10/12-bit depth are preserved.
Hit Start
AVIF output, ~50% smaller than JPEG. Nothing is uploaded anywhere.
The User Guide walks through every setting and handy workflow, with screenshots.
Feature highlights
Beyond AVIF encoding, AVIF Converter. handles resizing, metadata control, a before/after comparison preview, and batch watermarking — all in a single window.
ENCODE · RESIZE · STRIP · OUTPUT
Every control you need. Tuned to
AVIF at the core, with JPEG/PNG fallbacks also available as outputs. Get fine-grained control over quality, dimensions, color profile, and metadata, per file.
Before/after file size and compression ratio are shown in the UI, so you can see exactly how much lighter the output gets, while you tune.
Encode
- AVIF55
- JPG75
- PNG—
Resize
Max 1920pxStrip metadata
EXIF · GPS · camera- GPS35°41'22"N · 139°41'30"E
- CameraCanon EOS R5 · RF 50mm F1.2 L
- Date taken2024:08:14 18:22:07
- ICC profileDisplay P3 · kept
Output
4032 × 3024SIDE-BY-SIDE · PIXEL LEVEL
Slide and compare.
Drag the divider to compare original vs encoded output, frame-perfect. AVIF's strong compression is something you can commit to with confidence once you see it side by side.
Match JPEG's perceived quality at half the file size — or push past JPEG quality at the same size — and verify it with your eyes before writing.
POSITION · SIZE · OPACITY · OFFSET
Watermarks,
Drop a logo, set a position, dial in opacity and size. Applied to every image in the batch — automatically.
Works on still and animated AVIF alike. Convert GIF/WebP animations into dramatically lighter animated AVIFs in the same pass.
Watermark Settings
Enabled
Support
The AVIF Converter. User Guide covers everything in detail, with screenshots: AVIF settings and defaults, HDR images, turning AVIF back into PNG or JPG, batch renaming, watermarks, presets, and keyboard shortcuts.
If you get stuck, find a bug, or want a new feature, send a note via the contact form below.Every message is read by the developer and feedback shapes the next update.
The app is free to start, so try it without commitment. If anything comes up, the developer is one click away.
Free to download
macOS 12+ · Apple Silicon native · 100% local processing
How it compares
Unlike online converters, AVIF Converter. completes the entire batch conversion on your Mac — images never leave your machine. And unlike libavif, everything happens in a GUI: no shell scripting required.
| What you need | AVIF Converter. | WebP tool | libavif (CLI) | Online converter |
|---|---|---|---|---|
| Size reduction vs JPEG | ✅ ~50% | △ 25–35% | ✅ ~50% | △ Service-dependent |
| HDR / 10-12-bit depth | ✅ Preserved | ❌ 8-bit only | ✅ Preserved | ❌ |
| GUI workflow | ✅ | ✅ | ❌ Command line | ✅ |
| Images stay local | ✅ 100% local | Depends | ✅ | ❌ Server upload |
| Finder right-click integration | ✅ | △ | ❌ | ❌ |
| Price | Free + IAP | Free / paid | Free | Free / metered |
AVIF format snapshot
AVIF isn't just "smaller than JPEG" — it covers virtually every modern visual requirement in a single format.
| Capability | JPEG | WebP | AVIF |
|---|---|---|---|
| Compression at equal quality | Baseline | ~25–35% smaller | ~50% smaller |
| Transparency / animation | No | Yes | Yes |
| 10-bit / 12-bit depth | No | No | Yes |
| HDR / wide gamut | No | Limited | Full |
Browser support: Chrome (since 2020), Firefox (since 2021), Safari (macOS 13 / iOS 16+), Edge (since 2024). Use <picture> with AVIF → WebP → JPEG fallback to stay safe on older clients.
Pricing
AVIF Converter. is free to download, and its core feature — batch conversion to AVIF — stays free. Only the extended features are in-app purchases.
| Plan | What's included |
|---|---|
| Free | Bulk conversion to AVIF, drag & drop, Finder right-click integration. Everyday use is fully free. |
| In-app purchase / subscription | Quality control, resizing, before/after preview, watermarks, JPEG/PNG fallback output. See the App Store for current pricing. |
Supported formats
AVIF Converter. reads PNG, JPG, HEIC, TIFF, GIF, WebP, and other major image formats, and converts them to AVIF.
| Direction | Formats |
|---|---|
| Read | PNG, JPG, HEIC, TIFF, GIF, WebP, and other major formats |
| Write | AVIF (primary). JPEG / PNG for fallback delivery. |
Who is it for
- Performance-minded front-end engineers — generate AVIF → WebP → JPEG fallback sets in one pass.
- Video and photo creators — bring HDR and wide gamut to the web.
- Image-heavy media operators — already on WebP and ready to take the next step.
- App and game developers — shrink asset bundles and improve download times.
- Independent bloggers — differentiate on raw site speed.
Free to download
macOS 12+ · Apple Silicon native · 100% local processing
Why local processing
Images often carry EXIF metadata — capture time, GPS coordinates, camera model. With an online converter, that metadata travels to a third-party server along with the image itself. AVIF Converter. runs inside the macOS App Sandbox, and every conversion happens entirely on your Mac. Because images are never sent off your machine, unreleased work, HDR masters, client photos, and internal assets can be converted as they are. It works offline, too.
FAQ
QHow do I batch convert PNG or JPG to AVIF on a Mac?
QAre my images uploaded anywhere?
QCan it convert HEIC photos from an iPhone?
QIs it safe to ship AVIF today?
<picture> with AVIF as the primary and WebP/JPEG as fallbacks; older clients still get a normal image. "Move forward without risk" is genuinely the right description today.QHow is it different from WebP Converter.?
<picture> fallbacks.QCan macOS Preview.app open AVIF?
QHow much quality do I lose?
QSystem requirements?
Related guides
These guides compare the conversion methods (including the command line and built-in macOS tools) and explain how to choose a format.
- How to batch convert images to AVIF on a Mac
- WebP vs AVIF: which image format should you use?
- How to batch convert PNG and JPG to WebP on a Mac
Download
AVIF Converter. is free to start. Add the features you need via in-app purchase or subscription.
Free to download
macOS 12+ · Apple Silicon native · 100% local processing
Looking for WebP-only? WebP Converter.Want one app for everything? Image Tool+.