Free
$0
- 100% local compression, no image uploads
- Up to 50 images per batch
- Keeps nested folder structure in the ZIP
Swiftiny
Convert PNG to AVIF in batches, locally
Output format is set to AVIF on this page. Drop PNG files (JPG and WebP work too), convert them in your browser, and download a ZIP. Folder paths are preserved. Nothing is uploaded.
Why convert to AVIF hereAVIF is usually smaller than PNG and WebP at similar quality. Encoding runs in WebAssembly on your device, so unpublished assets never hit a third-party server. Chrome and Safari can both open the result.
Drop images or folders here
Supports PNG, JPG, WebP, and AVIF. You can choose files or folders, and folder paths are kept in the zip.
Selected0 image(s)
Original size0 B
Output size0 B
Savings0%
Select or drop multiple images, then start compression. By default, the tool aims to reduce size while preserving visual quality, and you can compare sizes after processing.
Compression settings
Batch PNG to AVIF without an upload queue
Online converters often cap file size because every image is uploaded. Swiftiny converts in the browser: choose PNG files or a folder, keep the quality slider around 75, and download AVIF files named for the originals.
If you drop a folder, the ZIP still contains the same nested directories, only the extension changes to .avif. That makes it straightforward to swap assets on a site that already serves AVIF.
You can still switch the output format back to PNG, JPG, or WebP in the settings. Free batches are limited to 50 images; Pro unlocks unlimited images per batch with a one-time purchase.
Frequently Asked Questions
Is PNG to AVIF conversion done on a server?
No. Conversion runs in your browser with WebAssembly. Your PNGs are not uploaded to Swiftiny.
Do Chrome and Safari both support AVIF?
Yes. Current Chrome and Safari can display AVIF. Encoding also runs in both browsers via a wasm32 encoder, so you are not limited to Chrome.
Can I convert a whole folder of PNGs to AVIF?
Yes. Choose a folder or drop nested directories. The ZIP keeps the original structure with .avif files inside. Free use allows up to 50 images per batch.
Pricing
Free to try. Pro when batches get big.
Compression still happens on your device. Pay once for unlimited images per batch — Creem handles checkout, cards, and tax.