LocalJPG

AVIF File Won't Open?

Drop your AVIF file here to convert it to JPG — opens in every app. No upload, runs in your browser.

Your photos stay home

Sceptical? Watch DevTools → Network while converting: zero uploads.

0 server uploads

Drop photos

HEIC, WebP, or a ZIP

Converts instantly

On your device only

Download JPGs

Singly or as one ZIP — free

Output preset

free · no account

Why LocalJPG?

Private by architecture

Files never upload — conversion runs in your browser. Most converters send photos to a server first.

Works offline

Installs as an app after the first visit. Airplane mode? Still converts.

Batch + ZIP, free

Drop a whole folder, download one ZIP. Others gate batches behind accounts or paid plans.

EXIF preserved

Capture date, GPS, orientation survive the conversion. Compressors often strip them.

Why AVIF files don't open in most apps

AVIF (AV1 Image File Format) was standardised in 2019 by the Alliance for Open Media — the same group behind the AV1 video codec used by Netflix and YouTube. It achieves roughly 20–50% smaller file sizes than JPEG at equivalent visual quality, which is why websites increasingly use it. When you right-click and save an image from a modern site, you may end up with a .avif file.

The problem is desktop adoption lagged years behind browser support. Chrome supported AVIF in 2020, Firefox in 2021. But Windows Photo Viewer — the built-in viewer on older Windows — has no AVIF support at all. Windows 11 added it to the Photos app in a 2021 update, but Windows 10 does not support it natively. Photoshop added basic AVIF support in 2021, but it remains buggy in older versions. Email clients, Office applications, and most upload forms do not accept AVIF.

AVIF vs WebP vs HEIC — the same compatibility problem

AVIF joins WebP and HEIC as modern formats that browsers display perfectly but desktop software struggles with. The pattern is consistent: new codec developed for web efficiency → browsers adopt it within a year or two → desktop apps take 3–5 years to follow → users get files they cannot open.

JPEG is the only format that opens everywhere without exception — every operating system, every app, every web upload form. Converting AVIF to JPG removes the compatibility problem permanently for that file.

Convert without uploading

The converter above uses a WebAssembly build of the AV1 image decoder to read AVIF data locally, then re-encodes it as JPEG at quality 85 using MozJPEG. Nothing is transmitted — you can verify by opening DevTools → Network before dropping the file.

Related: AVIF to JPG converter · WebP file won't open · iPhone photos not opening on Windows