Why convert JPG to AVIF?

AVIF uses modern compression that typically produces files 30-50% smaller than JPEG at the same visual quality, which speeds up web pages and saves storage. It is supported by current versions of Chrome, Edge, Firefox and Safari.

How much smaller will my AVIF files be?

It varies with the image and the quality setting, but AVIF is typically 30-50% smaller than the equivalent JPEG. Each converted image shows its new byte size so you can compare against the original.

What quality setting should I use?

The slider runs from 10% to 100% and defaults to 60%, which keeps photos looking sharp while saving a lot of space. Lower it for thumbnails and previews; raise it toward 90-100% for hero images where detail matters.

Does the image keep its original dimensions?

Yes. The picture is drawn onto a canvas at its full natural width and height, so the pixel dimensions are unchanged — only the encoding and file size differ.

Can I convert several JPGs at once?

Yes. Drop multiple files and each is converted in turn, with its own new size and download button.

Are my images uploaded to a server?

No. Conversion happens entirely in your browser using the HTML canvas — your photos are never uploaded, stored or seen by anyone.

How accurate is the conversion?

The image is decoded and re-drawn at its original pixel dimensions, then re-encoded as AVIF at the quality you choose. AVIF is a lossy format, so very high quality settings keep detail close to the original while still shrinking the file.

What is the JPG to AVIF Converter?

Free JPG to AVIF converter. Turn JPEG photos into the modern AVIF format for dramatically smaller files at the same quality, with a quality slider. Privacy-first and runs entirely in your browser — your images are never uploaded. It runs free in your browser on Gera Tools, with nothing uploaded.

JPG to AVIF Converter

Name: JPG to AVIF Converter
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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Convert JPG photos to AVIF without uploading them

AVIF is a modern image format based on the AV1 video codec. For the same visual quality it is usually far smaller than JPEG, so pages load faster and you store less. This tool re-encodes your JPG photos as AVIF using a quality slider you control, with no upload and no signup.

What makes AVIF smaller than JPEG?

JPEG was standardised in 1992 using a DCT (Discrete Cosine Transform) compression algorithm that divides the image into 8×8 pixel blocks. At lower quality settings those blocks become visible as the characteristic “blocky” or “blurry” JPEG artefact pattern. AVIF is derived from the AV1 video codec (2018) and uses more sophisticated compression techniques — larger and variable transform block sizes, better prediction modes, and more efficient entropy coding — that remove more redundant information before introducing perceptual artefacts. The practical result is that an AVIF at the same visual quality is meaningfully smaller.

A rough size comparison for photographic content at equivalent visual quality:

Format	Relative file size
JPEG (baseline)	100%
WebP	~65–75%
AVIF	~45–65%

These are rough averages; the actual ratio depends on image content (photographic scenes compress better than flat graphics), quality settings, and the specific encoder. The tool shows the exact byte size after each conversion so you can compare directly.

How it works

Each JPG is decoded by the browser and drawn onto an HTML <canvas> at its original pixel dimensions. The canvas is then re-encoded with canvas.toBlob("image/avif", quality), where the quality slider (10%–100%, 60% by default) maps to the AVIF encoder’s quality setting. The result is offered as a downloadable .avif file showing its new byte size.

AVIF encoding requires a recent browser: Chrome 85+, Edge 85+, Firefox 93+, Safari 16+. If your browser cannot encode AVIF, the tool reports this rather than silently failing.

Quality slider guidance

Quality	Typical use case
10–30%	Thumbnails, previews, low-bandwidth delivery
40–60%	General web photos; good default for most content
70–85%	E-commerce product photos where detail matters
90–100%	Hero images, photography portfolios; near-lossless

The default 60% is a good starting point for most web images. Drop lower for images that will only ever be seen at small sizes on screen.

Browser support for displaying AVIF

All major browsers can display AVIF images. Older browsers (Internet Explorer, Safari before 16) cannot. If you need compatibility with older users, serve AVIF with a JPEG fallback using the HTML <picture> element:

<picture>
  <source srcset="photo.avif" type="image/avif" />
  <img src="photo.jpg" alt="…" />
</picture>

Everything runs locally in your browser — your photos are never uploaded, stored, or seen by anyone.