JFIF to AVIF, explained
Convert JFIF to AVIF directly on your device. Create a still AVIF image with alpha using a lazy local WASM codec. Check the decoded photo before conversion. A .jfif extension does not guarantee valid JPEG data, and damaged downloads can still fail.
Choose JFIF files and confirm the preview.
Keep AVIF selected. Adjust quality and check fine detail after conversion.
Convert and download the AVIF results. Multiple results can be saved together as a ZIP.
Reading your JFIF source
A .jfif download commonly contains JPEG image data. This tool decodes and re-encodes that image; it does more than rename the extension. Existing compression artifacts remain and source metadata is removed.
Settings for AVIF output
Choose quality 1–100 or lossless. The shared quality scale does not imply equal quality across codecs. AVIF encoding is slower than native JPEG and downloads a separate codec only when used.
Dimensions in JFIF to AVIF
Original size keeps decoded raster dimensions. Advanced Settings offers percentage scaling or fit within a maximum width and height, with aspect ratio preserved and no cropping. Input and output safety limits both apply.
What survives the conversion
Output stores decoded 8-bit pixels. Lossless preserves those pixels, not original HDR, bit depth, metadata or animation. Check gradients and compatibility before sharing. Check the decoded photo before conversion. A .jfif extension does not guarantee valid JPEG data, and damaged downloads can still fail.
Batch processing and device limits
Choose up to 50 files, each at most 64 MB. Decoded images must fit 24 megapixels and 16,384 pixels per side; total outputs are capped at 256 MB. All conversion runs on this device. Source metadata is removed, and damaged or unsupported variants can fail without changing the originals.