PJPEG to AVIF Converter
FileFlip converts PJPEG to AVIF entirely inside your browser, using ImageMagick compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a PJPEG file to AVIF?#
- Drop your PJPEG file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to AVIF and the conversion starts on its own. FileFlip downloads 14.1 MB of WebAssembly the first time and nothing after that, then runs ImageMagick on your own machine.
- Save the AVIF file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting PJPEG to AVIF lose quality?#
Yes, a little. PJPEG and AVIF are both lossy, so the file is decoded from one encoding and written into another, and detail goes each way. A single conversion is usually impossible to spot; converting back and forth repeatedly is not.
Is it safe to convert PJPEG files online?#
Yes, because nothing is uploaded. FileFlip converts PJPEG files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What PJPEG to AVIF actually does to the file#
Converting PJPEG to AVIF runs on ImageMagick, downloads 14.1 MB of WebAssembly the first time and nothing after that, decodes one lossy encoding and writes another, keeps EXIF metadata and ICC colour profile.
| Engine | ImageMagick |
|---|---|
| Conversion path | One step: PJPEG → AVIF |
| Downloaded to your browser | 14.1 MB, once, then cached by your browser |
| Quality | Lossy, second generation |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| EXIF metadata | Kept | Carried through into the converted file. |
| ICC colour profile | Kept | Carried through into the converted file. |
What is a PJPEG file?#
PJPEG is progressive JPEG, a JPEG encoding choice rather than a different file format, where the image is built up through several increasingly detailed scans across the whole picture instead of filling in top to bottom in one pass.
Choose progressive encoding for images shown over a slow or uncertain connection, where a quick blurry preview beats a slow top-down reveal.
Convert to baseline JPEG when a downstream tool or embedded device only supports the simpler sequential scan order.
What is an AVIF file?#
An AVIF file holds a still image or short animation encoded with the AV1 video codec, packaged inside a HEIF-style container that also carries HDR and wide-colour-gamut data alongside the pixels.
Use AVIF for web images where file size matters most, since it now decodes natively in every major browser and beats JPEG and WebP on compression at the same quality.
Convert AVIF to JPEG or PNG when a file is headed somewhere that still rejects it, such as an older content management system, a print workflow, or an app without AV1 decoding.
PJPEG to AVIF questions people ask#
What is PJPEG?
PJPEG is progressive JPEG, a JPEG file encoded in a handful of increasingly detailed scans instead of one pass from top to bottom. It's still a JPEG file, just encoded differently, and opens anywhere JPEG does.
What's the difference between PJPEG and a regular JPEG?
A regular, baseline JPEG fills the image in from top to bottom as it loads. PJPEG encodes several scans of the whole picture, each adding sharper detail, so a rough version of the entire image appears almost immediately and refines as more data arrives.
Does progressive JPEG reduce image quality?
No, PJPEG uses the same lossy JPEG compression as baseline JPEG at a given quality setting, and often produces a slightly smaller file because each scan can use its own optimized Huffman table.
What is an AVIF file?
An AVIF file is an image compressed with the AV1 video codec instead of the older JPEG or WebP algorithms, which is why it produces noticeably smaller files at the same visual quality. It was created by the Alliance for Open Media, the same group behind the AV1 video format, and first shipped in 2019.