KuConvert

JPG to AVIF converter

Convert JPG to AVIF online

Convert JPG images to AVIF quickly and privately. Process up to 50 images at once, free and without an account.

Convert to

AVIF — Best compression, newer browser support.

Processed privately in your browser

  • Browser-based processing
  • No account required
  • Up to 50 images
  • Free to use
JPGAVIF

Why convert JPG to AVIF?

AVIF is the most efficient format this converter writes. For photographic JPGs on a performance-sensitive site, it offers the strongest size reduction available without visibly degrading the image.

The biggest size win

AVIF generally beats both JPG and WebP on photographic content at a matched quality level.

Better gradients

AVIF handles smooth skies and soft gradients with less banding than JPG at low bitrates.

Built for modern delivery

Paired with a picture element and a JPG fallback, AVIF cuts image bandwidth substantially.

The formats

JPG and AVIF, side by side

JPG

Source

The most widely supported photographic format. Excellent for photographs, but it cannot store transparency.

Transparency: Not supported · Compression: Lossy

AVIF

Output

Next-generation format with the strongest compression of the group. Encoding support depends on the browser, so KuConvert checks availability before offering it.

Transparency: Supported · Compression: Lossy

FAQ

JPG to AVIF conversion questions

How do I convert JPG to AVIF?

Drop your JPG files into the converter at the top of this page, or use the browse button to pick them. AVIF is already selected as the output format, so you can convert straight away.

Up to 50 files can be converted in one batch, and the results download individually or together as a ZIP.

Is JPG to AVIF conversion free?

Yes, with no account and no file-count paywall. The conversion runs on your device, so there is no per-image cost to pass on.

Does converting JPG to AVIF lose quality?

AVIF is a lossy format, so some data is discarded during encoding. The quality slider controls how much, and the default of 88 is chosen to be visually hard to tell apart from the source at normal viewing sizes.

Since JPG is also lossy, this is a second compression pass. Start from the best-quality source file you have.

Are my JPG files uploaded anywhere?

No. The conversion happens entirely in your browser using your device’s own image codecs. There is no upload endpoint, and nothing on the page that can read your content.

Is transparency preserved when converting JPG to AVIF?

Yes. AVIF supports an alpha channel, so transparent areas stay transparent. You can turn this off in advanced settings and flatten onto a background colour instead.

Related

Other conversions

The same converter, pre-configured for a different pair of formats.

AVIF to JPGJPG to WebPJPG to PNGPNG to AVIFAll conversions

KuConvert converts to WebP, JPG, PNG and AVIF from any source your browser can decode, so you are never locked into the pair this page starts with — change the output format in the converter at any time.

Who builds these

Free tools by day. Websites that earn their keep by trade.

KuConvert is built by KUDUY, a web design and development agency. From custom WordPress builds to SEO and e-commerce, everything they do is engineered to bring you more qualified traffic and turn it into revenue.

Web Design

Custom, conversion-focused web design that captivates visitors and turns them into paying customers. Mobile-first, fast, and built to rank.

Web Development

Custom WordPress websites built with clean code, blazing-fast performance (Core Web Vitals optimised), and enterprise-grade security.

E-Commerce

Online stores that convert visitors to customers with seamless shopping experiences.

SEO

Technical SEO, keyword research, on-page optimisation and local SEO strategies that drive qualified organic traffic.

Digital Marketing

Data-driven campaigns that deliver measurable ROI across every channel.

Branding

Memorable brand identities that stand out in any market and build lasting trust.

Website Help

One-on-one expert support for bug fixes, updates and ongoing maintenance — without a long-term retainer.

  • Fixed scope, no surprise invoices

    Most sites ship in four to eight weeks with the scope and the price agreed up front.

  • SEO from day one

    Search is designed into the build — structure, schema and Core Web Vitals — not retrofitted.

  • A team, not a ticket queue

    A project manager, a designer and a developer you can actually reach.

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Convert your images without the busywork.

Up to 50 images. Multiple formats. No account required.

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