FastImageToolsFastImageTools

Convert Images to AVIF Online — Free & Next-Gen Quality

Convert JPG, PNG, WebP, and more to AVIF instantly.

Free — no hidden feesBatch + ZIP download
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Images are processed locally in your browser whenever possible. If local processing isn't supported or fails, we automatically complete the job on our servers — no action required. Supports JPG, PNG, WebP, GIF, BMP, and more. Lossy and lossless modes, batch conversion — no signup, no fees.

Why Use FastImageTools

Local-First Processing

Images are converted in your browser by default using WebAssembly. Automatic server fallback if needed.

Instant Results

Preview your AVIF conversion in real time before downloading. No signup or email required.

Completely Free

No file limits, no watermarks, no hidden fees. Professional-grade AVIF conversion at zero cost.

Next-Gen Compression

AVIF delivers up to 50% smaller files than JPEG at the same visual quality, with support for transparency and HDR.

How to Convert to AVIF

  1. 1

    Upload Your Images

    Drag and drop or browse your files. Supports JPG, PNG, WebP, GIF, BMP, and other common image formats.

  2. 2

    Choose AVIF Settings

    Select lossy or lossless mode, adjust quality, and configure transparency handling.

  3. 3

    Download AVIF Files

    Preview the result, then download your AVIF images individually or as a ZIP archive.

Browser-Based vs Cloud Conversion

FastImageTools (Local-First)

  • Images stay on your device by default
  • Instant conversion — no upload wait
  • Handles large files locally when possible
  • Free with no usage caps
  • Automatic server fallback if needed

Cloud-Based Tools

  • —Files uploaded to third-party servers
  • —Speed limited by upload and download
  • —Typical 5–25 MB file size limit on free tiers
  • —Often requires paid plans for batch or large files
  • —Requires a stable internet connection

Example Result

Original

3.8 MB

photo.jpg

-84% smaller — visually identicalJPG → AVIF

Converted

0.6 MB

Lossy, auto quality — 128 colors

Supported Input Formats

JPG / JPEG

Photographs and web images. AVIF delivers dramatically smaller files with the same visual quality.

PNG

Screenshots and graphics with transparency. AVIF supports full alpha-channel transparency.

WebP

Modern web format. AVIF offers even better compression and quality than WebP.

GIF

Simple animations and graphics. Convert to AVIF for dramatically smaller static images.

SVG

Scalable vector graphics. Rasterized at configurable dimensions during conversion.

BMP

Uncompressed bitmap images. Convert to AVIF for the smallest possible file sizes.

Frequently Asked Questions

Does converting to AVIF reduce image quality?+
In lossy mode, there is a small quality reduction, but AVIF is designed to be visually identical at much smaller file sizes. In lossless mode, the image is pixel-perfect — no quality loss at all.
Is it safe to convert images here?+
Yes. By default, conversion runs entirely in your browser via WebAssembly — your files stay on your device. If your browser doesn't support local processing, images are processed on our secure servers and deleted automatically within 72 hours of completion.
What is the maximum file size I can convert?+
Browser-based processing handles images up to approximately 100 MB depending on your device's CPU and RAM. For very large files, the tool automatically routes processing to secure cloud servers.
Can I convert multiple images at once?+
Yes. Upload as many images as you need. All images are converted with the same settings and can be downloaded individually or as a single ZIP file.
Which browsers support AVIF?+
AVIF is supported in Chrome 85+, Firefox 93+, Safari 16.4+, and Edge 85+. For older browsers, consider WebP or JPEG as a fallback format.
Does AVIF support transparency?+
Yes. Unlike JPEG, AVIF fully supports alpha-channel transparency in both lossy and lossless modes. You can preserve or flatten transparency during conversion.
Is AVIF better than WebP?+
AVIF generally achieves 20–30% smaller files than WebP at the same visual quality. It also supports HDR, wider color gamuts, and better compression for photographic content. However, WebP has broader browser support.
Are my images uploaded to your servers?+
FastImageTools processes images locally in your browser whenever possible. In rare cases where local processing isn't supported or fails, we automatically process images on our servers to complete the job. Server-processed files are deleted within 72 hours of completion. This happens transparently — no action is required from you.

Related Image Tools

Done converting? These tools work great as a next step:

Compress Image

Reduce file size of your AVIF images for faster loading.

Resize Image

Change dimensions for social media, email, or web.

Convert to WebP

Create a WebP fallback for browsers that don't support AVIF.

Convert to JPG

Convert to JPG for universal compatibility across all devices.

Add Watermark

Protect your images with text or logo watermarks.

Metadata Editor

View, edit, or strip EXIF and GPS data from images.

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