Images

PNG → AVIF

Learn about the formats: What is PNG? What is AVIF?

Convert your PNG images to AVIF to drastically reduce file size while preserving transparency and visual quality. This is ideal for web developers and content creators seeking optimal site performance.

PNG is a widely used lossless format, excellent for detailed graphics and images requiring transparency, but often results in large file sizes. AVIF, a next-generation format, leverages advanced AV1 video compression to deliver superior image quality at significantly smaller file sizes, typically 50-70% smaller than JPEG or WebP, while also supporting transparency. When you convert PNG to AVIF, the image data is re-encoded using AVIF's efficient lossy compression algorithm, dramatically shrinking the file size for faster loading without perceptible quality degradation for most applications.

While AVIF uses lossy compression, it's highly efficient, meaning you can achieve near-perceptual lossless quality at much smaller file sizes compared to the original lossless PNG.

Tips

For best results, convert high-resolution PNGs to AVIF to maximize size savings.
Always check the converted AVIF file in different browsers, especially older ones, as AVIF support isn't universal yet.
Consider using a "fallback" PNG or JPEG for browsers that don't support AVIF (e.g., via <picture> tag).
Experiment with different quality settings during conversion if available to balance file size and visual fidelity.

Common use cases

Optimizing website images (logos, illustrations, transparent banners) for faster page load times.
Reducing storage space for large archives of transparent graphics.
Preparing images for modern web applications that prioritize performance and bandwidth.
Creating high-quality, lightweight images for mobile apps or progressive web apps.

Why ConvertX stays free — forever

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Free tools today — and always

Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.

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Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.

File formats: what to choose

A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.

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Images

Raster and vector graphics for web, print, and photography.

Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF

Advantages

+ WebP and AVIF offer excellent compression for the web
+ PNG keeps transparency and sharp edges
+ SVG scales without quality loss

Disadvantages

− RAW and TIFF files are large and slow to share
− JPEG loses quality on every re-save
− Some formats are not supported in older browsers

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Documents

Office files, PDFs, ebooks, and plain text.

Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT

Advantages

+ PDF locks layout for printing and sharing
+ DOCX and ODT are easy to edit collaboratively
+ Plain text works on any device

Disadvantages

− PDF is hard to edit without special tools
− Complex layouts may shift after conversion
− Scanned PDFs need OCR for editable text

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Video

Clips, streams, screen recordings, and movies.

Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG

Advantages

+ MP4 (H.264/H.265) plays almost everywhere
+ WebM is efficient for web embedding
+ MKV can hold multiple audio and subtitle tracks

Disadvantages

− High-resolution video needs lots of storage and bandwidth
− Re-encoding always takes time and may reduce quality
− Some codecs require licensing for commercial use

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Audio

Music, podcasts, voice recordings, and sound effects.

Common extensions: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS

Advantages

+ FLAC and WAV preserve full quality for editing
+ MP3 and AAC are universally compatible
+ OPUS delivers great quality at low bitrates

Disadvantages

− Uncompressed WAV files are very large
− Lossy formats cannot be restored to original quality
− DRM-protected files may not convert

Frequently asked questions

Yes, AVIF fully supports transparency (alpha channel), so your converted images will retain their original transparency.

The reduction varies, but AVIF files are typically significantly smaller than PNGs, often by 70% or more, depending on the image content and compression settings.

AVIF uses lossy compression, so technically there is some data loss. However, its advanced algorithms make this loss often imperceptible to the human eye, especially at higher quality settings.

Modern browsers like Chrome, Firefox, Edge, and Opera support AVIF. Safari support is also available on recent versions. However, older browsers might not, so a fallback strategy is recommended for broad compatibility.

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