CONVERT
JPEG → AVIF
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Fast, secure JPEG to AVIF conversion. No registration required.
JPEG was engineered in 1992 around the Discrete Cosine Transform: it divides an image into 8x8 pixel blocks, converts them to the YCbCr color space, and applies quantization that preferentially discards high-frequency chroma detail the human eye notices less. That block-based design is the root cause of the two artifacts that drive users to AVIF: the characteristic 8x8 blockiness at aggressive compression levels, and the complete absence of an alpha channel, which forces any JPEG image needing transparency to be rebuilt from scratch. AVIF is a still-image profile of AV1 encoded in the ISOBMFF container. It replaces the DCT with a combination of transforms selected per block (including a larger 64x64 block capability), adds intra-prediction modes borrowed from video coding, and uses a loop filter pass that suppresses ringing and banding. The practical result: at equivalent perceptual quality, AVIF files typically run 40-60 percent smaller than JPEG, with artifacts that smear gently rather than producing hard 8x8 edges. The trade-off is compute time — encoding AVIF is substantially slower than writing a JPEG, which matters during batch processing but is irrelevant once the file is served.
JPEG Image
Source formatJPEG alternate extension. Functionally identical to JPG but uses the four-letter extension. Some older systems and cameras produce files with this extension.
AVIF Image
Target formatAVIF is a next-generation image format based on the AV1 video codec. It offers significantly better compression than JPEG and WebP while maintaining excellent visual quality, including HDR and wide color gamut support.
Why convert JPEG to AVIF
The primary driver is bandwidth cost and Core Web Vitals. AVIF's superior compression at the same perceptual quality directly reduces LCP times on image-heavy pages. A secondary driver is the 8-bit ceiling of baseline JPEG: AVIF supports 10-bit and 12-bit per channel in the YUV 4:2:0, 4:2:2, and 4:4:4 chroma subsampling modes, which matters for photography workflows intended for HDR display. A third reason is archival: converting to AVIF before further editing is not advisable (AVIF is still lossy by default), but for delivery-optimized web copies, AVIF is the current best-in-class format for maximum compression without alpha-less constraints.
HOW TO CONVERT
JPEG → AVIF
Upload your JPEG
Start by dropping the JPEG onto the uploader. Files up to 25 MB go through on the free tier without registration; paid plans go up to 2 GB.
Conversion happens server-side
Our imagemagick-based pipeline reads the JPEG pixel grid, preserves resolution and colour profile, and encodes a clean AVIF.
Grab the result
A download button appears as soon as the AVIF is ready. Save locally or share the short-lived URL.
Common Use Cases
Share across platforms
Send AVIF files to anyone without worrying about whether they have the right software for JPEG.
Embed in documents
Drop AVIF output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
AVIF often produces smaller files than JPEG for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
JPEG vs AVIF — Strengths and limitations
What each format does best, and where it falls short.
JPEG Strengths
- Universally supported — every camera, browser, OS, and editor reads JPEG.
- Mature, deterministic, and fast to encode/decode.
- Small file sizes for photographs — DCT compression shines on continuous-tone imagery.
- Rich metadata ecosystem (EXIF for shooting data, XMP for editing, IPTC for captions).
- Progressive variant enables perceived faster loading on slow networks.
Limitations
- Lossy by design — every save further degrades quality ("generation loss").
- No transparency channel. Logos and UI elements belong in PNG or WebP.
- Terrible on flat colors, text, and sharp edges — blocking artifacts are visible.
AVIF Strengths
- Best-in-class compression efficiency — 30-50% smaller than JPEG for the same quality.
- Royalty-free and patent-unencumbered (unlike HEIC).
- Supports alpha transparency, HDR, wide gamut (BT.2020), and up to 12-bit color.
- Progressive decoding: a blurry preview appears while the file is still downloading.
- Supported in all major browsers since late 2022 — no polyfills needed.
Limitations
- Encoding is CPU-expensive — an AVIF export can take 10-30× longer than JPEG.
- Older software (pre-2022) cannot open AVIF without plugins.
- Email clients still largely ignore it — stick to JPEG for attachments.
JPEG vs AVIF — Technical specifications
Side-by-side comparison of the technical details.
JPEG
- MIME type
- image/jpeg
- File extensions
- .jpg, .jpeg, .jpe, .jfif
- Standard
- ITU-T T.81 / ISO/IEC 10918-1:1994
- Compression
- Lossy DCT (baseline); lossless mode exists but rarely used
- Color depth
- 8-bit per channel (24-bit RGB total)
- Max dimensions
- 65 535 × 65 535 px
AVIF
- MIME type
- image/avif
- Color depth
- Up to 12-bit per channel
- Max dimensions
- 65 536 × 65 536 px
- Container
- HEIF (ISOBMFF)
- Codec
- AV1 (intra-only)
- Color spaces
- sRGB, Display-P3, BT.2020, arbitrary ICC
| Specification | JPEG | AVIF |
|---|---|---|
| MIME type | image/jpeg | image/avif |
| File extensions | .jpg, .jpeg, .jpe, .jfif | — |
| Standard | ITU-T T.81 / ISO/IEC 10918-1:1994 | — |
| Compression | Lossy DCT (baseline); lossless mode exists but rarely used | — |
| Color depth | 8-bit per channel (24-bit RGB total) | Up to 12-bit per channel |
| Max dimensions | 65 535 × 65 535 px | 65 536 × 65 536 px |
| Container | — | HEIF (ISOBMFF) |
| Codec | — | AV1 (intra-only) |
| Color spaces | — | sRGB, Display-P3, BT.2020, arbitrary ICC |
JPEG vs AVIF — Typical file sizes
Approximate file sizes for common scenarios.
JPEG
- Thumbnail (400px) 20-60 KB
- Web photo (1920px) 200-500 KB
- Print-quality photo (3000px) 1-4 MB
- DSLR JPEG (24 MP, quality 95) 6-12 MB
AVIF
- Thumbnail (400px) 10-30 KB
- Web photo (1920px) 80-300 KB
- 4K photo (3840px) 300 KB - 1.2 MB
- Lossless copy of 24MP photo 8-15 MB
Quality & Compatibility
JPEG carries no alpha channel and AVIF's alpha capability is irrelevant here — the converted file will have a fully opaque background. The conversion is lossy-to-lossy: the source JPEG has already been quantized once, and the AVIF encoder will apply a second quantization pass over the decoded pixel values. This means generational quality loss is unavoidable; fine texture that survived the JPEG encode may soften further. Color space handling is consequential — JPEG embeds an sRGB ICC profile or omits one (implying sRGB), and a correct AVIF encoder will tag the output with the same color primaries. Metadata survival depends on implementation: EXIF (camera model, GPS, orientation) is carried in an AVIF metadata box and is preserved by most encoders, but XMP and IPTC caption data may be stripped by tools that prioritize file size over metadata completeness. Bit depth stays at 8-bit unless the encoder is explicitly instructed to upsample to 10-bit, which adds file overhead without recovering information that was discarded by the original JPEG encode.
Tips for Best Results
- Set the AVIF quality parameter between 60 and 75 (on a 0-100 scale where higher is better) for photographic content — below 60 the encoder's prediction artifacts become visible on smooth gradients like skies, and above 75 the file size advantage over the source JPEG narrows substantially.
- If your target audience includes Safari on iOS 15 or earlier, keep the original JPEG as a fallback served via the HTML picture element with an AVIF source, because AVIF support in WebKit was added only in Safari 16 (September 2022).
- For images where EXIF orientation matters (portrait shots taken with a rotated camera), verify the output after conversion — some pipelines decode the JPEG respecting the rotation tag but write the AVIF without the tag, silently rotating the image in browsers that honor EXIF.
Frequently Asked Questions
It depends on the codecs involved. If both JPEG and AVIF are lossy, the pixels are re-encoded and a small amount of detail is discarded — invisible at default quality settings on photographs. If AVIF is lossless (PNG, TIFF, BMP) the output keeps every pixel of the decoded JPEG exactly, but cannot recover detail that JPEG had already compressed away.
Often yes, especially when AVIF is lossless. JPEG tuned for efficient web delivery will usually produce smaller files than AVIF's default settings. If file size matters, drop the quality in Advanced or pick a more compressed target format instead.
KaijuConverter uploads over HTTPS, processes the image in an isolated container and deletes both the source and the output within two hours. No account is required, file contents are never logged, and we do not use uploads to train any model. For confidential material, the paid plan includes a data-processing agreement.
Related comparisons
See these formats side by side to understand which fits your use case best.
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Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.