WebAssembly AVIF encoding

JPG to AVIF Converter - Free & No Account Required

Create compact, modern AVIF images directly in your browser. Fine-tune quality, encoding speed, dimensions, and chroma sampling-then download files individually or together in one ZIP.

Local image processing Real AVIF output validation Batch and ZIP export

JPG to AVIF Converter

8-bit still AVIF output · sequential low-memory queue

Images stay local
68

Higher values retain more detail but usually produce larger files.

6 · Balanced

Lower values work harder; higher values finish faster.

Images are only reduced; smaller originals are never enlarged.

4:4:4 preserves more color detail and can increase size.

Lossless AVIF pass

The source remains a previously compressed JPG and output may be large.

Preparing encoder… 0%
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-Size change

Conversion queue

No files selected
Your selected JPG images and conversion results will appear here.
Images are read, decoded, resized, and encoded on this device. Network access is required to load the pinned JavaScript and WebAssembly encoder assets, but this converter does not send selected image data to a conversion server.

Local processingNo image upload step
Verified AVIFISO BMFF brand check
Sequential queueControlled memory usage
Transparent limitsNo fake instant encoding
A modern photo format

What happens when a JPG becomes AVIF?

The browser first decodes the JPG into raw RGBA pixels. If a longest-edge limit is selected, those pixels are resized while preserving the original aspect ratio. A WebAssembly encoder then compresses the resulting 8-bit pixel buffer into a still AVIF image.

This is a real decode-and-re-encode operation-not a filename change. Because JPG is already lossy, converting it cannot reconstruct texture or color information that the original JPG encoder removed.

Metadata and color behavior

Canvas-based pixel processing does not carry EXIF, GPS, XMP, comments, embedded thumbnails, or the original ICC profile into the result. Browser decoding and color management can also produce small visual differences.

Built for careful conversion

More than a one-click file renamer

Every control affects the actual browser-side AVIF encoding pipeline.

Private pixel processing

Selected images are processed by browser APIs and WebAssembly on your device.

Real speed control

Choose between more encoder effort and faster completion using the AVIF speed setting.

Aspect-safe resizing

Cap the longest edge without stretching, enlarging, or cropping the photograph.

Batch queue

Process up to 30 images sequentially to avoid running several memory-heavy encoders at once.

Live size comparison

Compare source and output bytes and see whether each AVIF is smaller or larger.

Validated downloads

Output is accepted only after its ISO BMFF file-type box identifies an AVIF-compatible brand.

Three-step workflow

From JPEG to downloadable AVIF

Select JPG images

Drop files into the converter or use the file picker. Signatures, sizes, duplicates, and limits are checked.

Choose encoding settings

Set quality, speed, maximum dimensions, chroma sampling, or the optional lossless AVIF pass.

Review and download

Inspect source and AVIF previews, compare sizes, and download one file or a stored ZIP archive.

Format comparison

JPG and AVIF serve different compatibility goals

Keep original assets when broad legacy support or metadata retention matters.

Characteristic JPG / JPEG AVIF Practical meaning
Compression generation Older DCT-based format AV1-based image format AVIF can often reach smaller files at comparable visible quality.
Encoding effort Usually fast Often CPU-intensive Large AVIF batches can take noticeably longer.
Transparency Not supported Supported by the format A JPG source is opaque, so this conversion does not create transparency.
Metadata in this tool May contain EXIF/XMP/ICC Pixel output only The browser pipeline intentionally does not copy source metadata.
Legacy compatibility Extremely broad Best in modern software Provide a JPG fallback where older clients must be supported.
Best practices

Get useful AVIF output without wasting bytes

1

Start at quality 68

It is a balanced starting point, not a universal optimum. Judge the actual preview.

2

Resize before heavy encoding

A 1024 or 2048 pixel longest edge is often sufficient for ordinary web content.

3

Use 4:2:0 for photography

Choose 4:4:4 when fine colored text or hard graphic edges visibly need it.

4

Do not assume AVIF is always smaller

Tiny or heavily compressed JPG files can produce larger AVIF results.

5

Keep source files

Metadata is removed, and a re-encoded derivative should not become your only copy.

6

Test your delivery targets

Confirm that browsers, apps, social platforms, and CMS pipelines accept AVIF.

Frequently asked questions

JPG to AVIF questions

Is this JPG to AVIF conversion private?

Yes. Your images are decoded and encoded locally in your browser. The page downloads its encoder files from a CDN, but the selected images are not uploaded by this converter.

Will converting JPG to AVIF improve image quality?

No. Converting cannot restore detail already removed by JPG compression. AVIF may produce a smaller file at a similar visible quality, but the process still begins with the decoded JPG.

What AVIF quality setting should I use?

A quality setting around 60 to 75 is a practical starting range for photographs. Inspect the preview and file size, then increase quality for finer detail or reduce it for smaller output.

Are EXIF, GPS, ICC, and other JPG metadata preserved?

No. The browser decodes the JPG into pixels before encoding AVIF, so EXIF, GPS, XMP, comments, embedded thumbnails, and original ICC profile data are not copied to the output.

Does lossless AVIF restore the original JPG?

No. Lossless mode avoids additional AVIF codec loss after the JPG has been decoded, but it cannot reverse the JPG compression already present and may create a much larger file.

Why can AVIF encoding take longer than JPG or WebP conversion?

AVIF compression is computationally intensive. Large dimensions, high quality, low speed values, 4:4:4 chroma, and lossless mode can significantly increase processing time and memory use.

Which browsers can use this converter?

It requires a modern browser with JavaScript, WebAssembly, Canvas, Blob URLs, and ES module support. AVIF preview also depends on the browser being able to display AVIF images.

Related tools

Continue your image workflow

JPG to WebP Convert JPEG photos to WebP JPG to PNG Create lossless PNG derivatives AVIF to JPG Create widely compatible JPG files AVIF to PNG Decode AVIF images into PNG

Ready to create smaller modern image assets?

Select your JPG files, tune the AVIF settings, and keep the entire image conversion workflow inside your browser.

Start converting JPG to AVIF
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JPG to AVIF converted preview