JXL to HEIC Converter
Convert JXL to HEIC in your browser. JXL files usually come from image editors, archival pipelines and lossless JPEG recompression; HEIC is the better fit for storing photos on Apple devices. You get a HEIF file whose picture is JPEG-compressed rather than HEVC, because no HEVC encoder runs in a browser. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
JXL expected · other image formats also work
How to use JXL to HEIC
- 1
Add your JXL files: drop them here, choose them, or paste from the clipboard.
- 2
Pick the colour that replaces transparent areas, since HEIC has none.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .heic files one at a time or together as a ZIP.
Why use Aback Images for jxl to heic
Where the HEIC goes next
HEIC opens in Apple devices, recent Android phones, and Windows with the HEIF and HEVC extensions.
HEIC next to JXL
Both formats are lossy, so the size mostly follows the quality setting; at the default the HEIC usually lands in the same range as the JXL.
A second lossy pass
JXL is lossy already, since it stores lossy VarDCT or lossless modular coding; existing JPEGs can be repacked without loss, so keep the quality at or above the default to avoid stacking a new layer of artefacts on the old one.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
JXL vs HEIC
What changes from JXL to HEIC
Encoding: the JXL uses lossy VarDCT or lossless modular coding; existing JPEGs can be repacked without loss; HEIC uses lossy HEVC (H.265) intra coding, on iPhones as a grid of 512×512 tiles, and the download is a HEIF file whose picture is JPEG-compressed rather than HEVC, because no HEVC encoder runs in a browser.
Bit depth: 8 to 16 bits per channel, or floating point in the JXL; HEIC allows 8 or 10 bits per channel, and the HEIC written here has 8 bits per channel. High-bit-depth JPEG XL files are reduced to 8 bits per channel.
Colour: sRGB, Display P3, linear and other spaces described in the codestream in the JXL; HEIC supports YCbCr, usually tagged Display P3 on iPhones, written here as 8-bit sRGB.
Transparency: the JXL stores it as an extra channel in the codestream; HEIC could hold it as an auxiliary image item, rarely used by cameras, but this writer flattens it, so transparent areas are filled with the colour you choose.
Animation: frames inside a single codestream; the HEIC holds one image, so only the first frame is converted.
Metadata: the JXL can carry EXIF and XMP boxes in the container form, often stripped by encoders; HEIC can carry EXIF, XMP and an ICC profile, stored as items, but nothing is copied across.
About JXL
JPEG XL is a next-generation format designed to replace JPEG. It compresses better than JPEG and WebP, supports lossless, HDR and progressive decoding, and can losslessly repack existing JPEGs.
A JPEG XL file is either a bare codestream starting with FF 0A or an ISO base media container whose 'jxlc' box holds the codestream. A recompressed JPEG keeps a 'jbrd' box that lets the original JPEG bytes be rebuilt exactly.
JXL files usually come from image editors, archival pipelines and lossless JPEG recompression.
About HEIC
HEIC is the default photo format on iPhones and many Android phones. It is about half the size of JPEG, but Windows, many websites and older software cannot open it without converting.
A HEIC is a HEIF file (ISO base media boxes with the brand 'heic'). iPhone photos store the picture as a grid of 512×512 HEVC tiles that the decoder stitches together, with the thumbnail, depth map and HDR gain map as further items.
When converting JXL to HEIC makes sense
HEIC is the better choice for storing photos on Apple devices, while JXL suits archiving and future-proof high quality storage.
HEIC strengths: About half the size of JPEG; Stores depth maps, Live Photos and HDR. Drawbacks to weigh: Not supported by most websites and Windows apps; Patent-encumbered codec.
Limitations
- A lossless JPEG XL may be someone's master copy: keep the original if the output is lossy.
- The file is a valid HEIF, but its picture is JPEG-coded rather than HEVC, so apps that expect HEVC (Apple Photos, Windows' HEVC extension) may not open it.
- The picture inside is JPEG-coded, so the file is about the size of a JPG at the same quality rather than the half size of a camera HEIC.
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Frequently asked questions
Does converting JXL to HEIC lose quality?
HEIC is lossy, so detail the eye barely notices is discarded to save space. The JXL was lossy already, so keep the quality high to avoid stacking artefacts. High-bit-depth JPEG XL files are reduced to 8 bits per channel.
What happens to transparency when converting JXL to HEIC?
JXL stores transparency as an extra channel in the codestream. HEIC has no alpha channel, so transparent pixels are composited onto a solid colour, white unless you pick another. To keep transparency, convert to PNG, WebP or AVIF instead.
Will my animated JXL stay animated?
No. HEIC holds a single image, so only the first frame is kept. Convert to animated WebP, APNG or GIF to keep the motion, or export every frame with the GIF Frame Extractor.
Will the HEIC open in Apple Photos?
Not always. The file is a valid HEIF container, but its picture is JPEG-compressed rather than HEVC, because no HEVC encoder can run in a browser. libheif-based apps such as GIMP, darktable and ImageMagick open it; Apple Photos and Windows' HEVC extension expect HEVC and may refuse it. For an iPhone, JPG is the safer choice.
Which apps open HEIC files?
Apple devices, recent Android phones, and Windows with the HEIF and HEVC extensions. It opens in Safari on recent Apple systems; other browsers do not display it.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.