JFIF to AVIF Converter

JFIF (JPEG) vs AVIF — Which Should You Keep?

A .jfif file is an ordinary JPEG that Windows saved under an unfamiliar extension, so this decision is really "JPEG or AVIF". The short answer: if the image is headed for a web page you control, convert it — AVIF stores the same picture in noticeably fewer bytes and now reaches the overwhelming majority of browsers. If the image has to be emailed, printed, dropped into an old editor, or handed to somebody whose software you cannot vouch for, stay on JPEG and just fix the extension instead. Files are uploaded over an encrypted connection, converted on our servers, and deleted automatically after a few hours.

Side-by-side Comparison

When to Stay on JFIF or JPEG

• The file is going into email, a print workflow, a legal or medical portal, or any upload form whose software you cannot check.
• Someone downstream will open it in an older editor, a scanning application, or an embedded viewer.
• The picture is tiny or already heavily compressed, where AVIF's advantage largely evaporates.
• All you actually wanted was a filename a program would accept — in that case JFIF to JPG is the honest fix and it leaves the format alone.

When to Convert to AVIF

• The image ships on a website you control and page weight matters; AVIF is the strongest of the widely-deployed still formats on bytes-per-quality.
• You can serve a <picture> element with a JPEG fallback, which covers the remaining few percent of clients.
• The photograph is large and detailed — smooth gradients, skies, skin tones and fine texture are where AV1's intra prediction pulls furthest ahead of JPEG.
• You are storing a big library and want the archive smaller without a visible change at normal viewing size.

How to Convert JFIF to AVIF

1. Upload Your JFIF File: Drag and drop the .jfif onto the page or use the upload button to browse. The uploader also takes .jpg and .jpeg, and several photos can be queued together.
2. Choose a Quality Preset: "Quality Preset" is the main control, pre-selected at "Very High (Recommended)". It runs Lowest through Highest and maps directly to the encoder's quality value.
3. Set a Size or Resolution (Optional): "Specific file size" encodes toward a byte budget, and "Image resolution" keeps the original pixels or lets you pick a preset, scale by percentage, or type an exact width and height. Cutting dimensions is still the biggest single lever on file size.
4. Convert and Download: Press Convert and save the .avif. No sign-up, no watermark.

Quality Preset Reference

The same number means something different to an AV1 encoder than to a JPEG encoder. AVIF stays clean at settings where JPEG would already show blocking, which is exactly why a lower preset can be reasonable here even when it would not be on a JPEG target.

Frequently Asked Questions

Will converting JFIF to AVIF make my image look better?

No, and no converter can. Your .jfif is already a lossy JPEG, so whatever detail the original compression threw away is gone permanently; AVIF has nothing to recover it from. What AVIF does is store the surviving picture far more efficiently. Re-encoding also adds a second lossy generation on top of the first, though at the default preset that added loss is not something you would spot at normal viewing size.

How much smaller will the AVIF actually be?

Commonly 20–50% smaller, but treat that as a range rather than a promise. The gain depends on the picture and on how hard the original JPEG was already squeezed: a large, detailed photograph saved at high quality has plenty of room to improve, whereas a small image that was already crushed to the edge of visible artefacts has very little left to win. If you need a specific number rather than a quality target, switch to "Specific file size" and give the encoder a byte budget.

Which browsers and apps can open an AVIF file?

Browsers are the easy part: caniuse currently tracks AVIF at roughly 94.7% of traffic, with support landing in Chrome 85, Opera 71, Firefox 93, Safari 16.4 and Edge 121. Desktop software is patchier. Recent versions of Windows (with the AV1 Video Extension installed), macOS, GIMP, Affinity Photo, and Photopea handle AVIF; older editors, many corporate document systems, and a lot of embedded viewers do not. Assume the recipient cannot open it unless you know otherwise.

Does the AVIF keep transparency or HDR from my JFIF?

There is none to keep. JPEG has no alpha channel and JFIF files are 8-bit standard dynamic range, so the AVIF you get is fully opaque 8-bit as well. AVIF's alpha, 10/12-bit and HDR capabilities are real, but they only matter when the source already carries that information — converting from a JPEG cannot invent it. Nothing is flattened or discarded in the process either, because there was nothing extra there to begin with.

Is a .jfif different from a .jpg for this conversion?

Not at all. JFIF is the JPEG File Interchange Format, standardised as ITU-T T.871, and the bytes inside a .jfif are an ordinary JPEG bitstream under the image/jpeg MIME type. Windows hands some downloaded and pasted images the .jfif extension because of its MIME registry entry for image/jpeg, which is why software that refuses .jfif opens the identical file once it is named .jpg. Upload .jfif, .jpg or .jpeg here and the resulting AVIF is the same. The reverse conversion, JPG to AVIF, is this same operation under the familiar extension.

Should I pick AVIF or WebP?

AVIF generally wins on compression and on capability — deeper colour, HDR, and usually smaller files at a matched appearance. WebP wins on reach and on speed: it has been supported for longer across browsers and desktop tools, and it encodes much faster, which matters when you are processing thousands of images. For a handful of hero images on a site you control, AVIF. For a bulk pipeline or a wider compatibility target, JFIF to WebP is the safer pick.

Why is there no lossless option or compression-speed slider on this page?

Because those controls belong to other formats. The "Lossless?" toggle and the compression level and speed sliders you may have seen elsewhere on this site apply to WebP and PNG output; on an AVIF target the encode is driven by the quality preset (or by the size target you set), so those controls are not shown here. Nothing is missing — there is simply one lever, and it is the one that matters.

Can I turn the AVIF back into a JPEG later?

Yes, with AVIF to JPG, but understand what that costs. Each lossy round trip is a fresh generation of compression, so an image that has gone JPEG → AVIF → JPEG has been encoded three times. If you may need the original later, keep the .jfif file rather than relying on converting back.

How are my uploaded files handled?

Your file is uploaded over an encrypted connection, encoded to AVIF on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and nothing is shared or made public. AVIF encoding is genuinely more work than JPEG encoding, so a very large photograph takes a few seconds longer than you might expect — that is the AV1 encoder, not the queue.