png2jxl

png2jxl converts supported PNG images to pixel-lossless JPEG XL while preserving enough information to reconstruct the original PNG byte-for-byte.

Installation

pip install -U png2jxl

Python API

from png2jxl import jxl_to_png, png_to_jxl

source = open("image.png", "rb").read()
archive = png_to_jxl(source)

assert archive is not None
assert jxl_to_png(archive) == source

Encoding and decoding are verified automatically against the original source.

To reject results that are larger than the source PNG:

archive = png_to_jxl(source, effort=10, only_if_smaller=True)

Command line

python -m png2jxl encode image.png   # writes image.jxl
python -m png2jxl decode image.jxl   # writes image.png
python -m png2jxl check image.jxl    # checks for the pngr envelope

Use -o/--output to choose an output path; otherwise the extension is swapped automatically.
Existing output files are never overwritten.
encode supports --effort 1-10, --threads, and --only-if-smaller.
Exit codes: 0 success, 1 failure, 2 usage error, 3 rejected by --only-if-smaller.

Pillow integration

Importing png2jxl extends the registered JXL save handler:

import png2jxl
from PIL import Image

with Image.open("image.png") as image:
    image.save(
        "image.png.jxl",
        format="JXL",
        png_reconstruction=True,
        effort=10,
    )

For path-backed PNG images, the original bytes are read from image.filename. For images opened from streams or modified in memory, pass the original bytes explicitly with source_png=source.

Ordinary JXL/JPEG behavior continues to delegate to pillow_jxl.

Supported PNGs

Supported:

Static 8-bit L, LA, RGB, and RGBA images
8-bit indexed-color PNGs with a valid PLTE and optional tRNS
PNG filters 0–4
Consecutive IDAT chunks

Not supported:

1/2/4-bit indexed samples
16-bit samples
APNG
Indexed images where two used palette entries resolve to the same effective RGBA color

Unused duplicate palette entries are allowed.

Limits and notes

Public functions accept an immutable ResourceLimits value. Defaults allow up to 1 GiB input/output and 512 MiB of filtered plaintext or preflate corrections.

Some generic-viewer color, transparency, or ancillary-metadata behavior may be limited by the upstream pillow_jxl encoder even though the original PNG bytes remain reconstructable. jxl_to_png currently assumes trusted JXL input because the upstream decoder does not expose a dimension-only preflight before pixel allocation.

Dependencies

pillow-jxl-plugin — JPEG XL encoding and decoding
preflate-rs — exact reconstruction of the original DEFLATE stream

Development

Metadata

Release files for png2jxl 0.1.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for png2jxl 0.1.0
File	Size	Uploaded
png2jxl-0.1.0.tar.gz	57.8 kB	Aug 25, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for png2jxl 0.1.0
File	Interpreter	ABI	Platform	Reset
png2jxl-0.1.0-cp314-cp314-win_amd64.whl 269.1 kB Aug 25, 2026	CPython 3.14	CPython 3.14	Windows x86-64	Details
png2jxl-0.1.0-cp314-cp314-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 370.5 kB Aug 25, 2026	CPython 3.14	CPython 3.14	Linux glibc 2.17+ x86-64	Details
png2jxl-0.1.0-cp314-cp314-macosx_11_0_arm64.whl 335.6 kB Aug 25, 2026	CPython 3.14	CPython 3.14	macOS 11.0+ ARM64	Details
png2jxl-0.1.0-cp313-cp313-win_amd64.whl 269.3 kB Aug 25, 2026	CPython 3.13	CPython 3.13	Windows x86-64	Details
png2jxl-0.1.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 370.4 kB Aug 25, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.17+ x86-64	Details
png2jxl-0.1.0-cp313-cp313-macosx_11_0_arm64.whl 335.5 kB Aug 25, 2026	CPython 3.13	CPython 3.13	macOS 11.0+ ARM64	Details
png2jxl-0.1.0-cp312-cp312-win_amd64.whl 269.6 kB Aug 25, 2026	CPython 3.12	CPython 3.12	Windows x86-64	Details
png2jxl-0.1.0-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 370.6 kB Aug 25, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.17+ x86-64	Details
png2jxl-0.1.0-cp312-cp312-macosx_11_0_arm64.whl 335.7 kB Aug 25, 2026	CPython 3.12	CPython 3.12	macOS 11.0+ ARM64	Details
png2jxl-0.1.0-cp311-cp311-win_amd64.whl 272.0 kB Aug 25, 2026	CPython 3.11	CPython 3.11	Windows x86-64	Details
png2jxl-0.1.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl 371.1 kB Aug 25, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.17+ x86-64	Details
png2jxl-0.1.0-cp311-cp311-macosx_11_0_arm64.whl 337.9 kB Aug 25, 2026	CPython 3.11	CPython 3.11	macOS 11.0+ ARM64	Details

Total release size: 4.0 MB

Release files / png2jxl-0.1.0.tar.gz

Download URL	png2jxl-0.1.0.tar.gz
Size	57.8 kB
Tags	Source
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Release files / png2jxl-0.1.0-cp314-cp314-win_amd64.whl

Download URL	png2jxl-0.1.0-cp314-cp314-win_amd64.whl
Size	269.1 kB
Tags	CPython 3.14 Windows x86-64
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Publishing repository: github.com/JiangJQ2000/png2jxl
Publishing commit: github.com/JiangJQ2000/png2jxl/tree/7682bede558b85b114d9b146e3b59013124e0fe3

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Download URL	png2jxl-0.1.0-cp314-cp314-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
Size	370.5 kB
Tags	CPython 3.14 Linux glibc 2.17+ x86-64
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing repository: github.com/JiangJQ2000/png2jxl
Publishing commit: github.com/JiangJQ2000/png2jxl/tree/7682bede558b85b114d9b146e3b59013124e0fe3

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Size	335.6 kB
Tags	CPython 3.14 macOS 11.0+ ARM64
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing repository: github.com/JiangJQ2000/png2jxl
Publishing commit: github.com/JiangJQ2000/png2jxl/tree/7682bede558b85b114d9b146e3b59013124e0fe3

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Download URL	png2jxl-0.1.0-cp313-cp313-win_amd64.whl
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Tags	CPython 3.13 Windows x86-64
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Publishing commit: github.com/JiangJQ2000/png2jxl/tree/7682bede558b85b114d9b146e3b59013124e0fe3

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Release files / png2jxl-0.1.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

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Size	370.4 kB
Tags	CPython 3.13 Linux glibc 2.17+ x86-64
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Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/JiangJQ2000/png2jxl
Publishing commit: github.com/JiangJQ2000/png2jxl/tree/7682bede558b85b114d9b146e3b59013124e0fe3

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Download URL	png2jxl-0.1.0-cp313-cp313-macosx_11_0_arm64.whl
Size	335.5 kB
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Publishing repository: github.com/JiangJQ2000/png2jxl
Publishing commit: github.com/JiangJQ2000/png2jxl/tree/7682bede558b85b114d9b146e3b59013124e0fe3

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Release files / png2jxl-0.1.0-cp312-cp312-win_amd64.whl

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Size	335.7 kB
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Release files / png2jxl-0.1.0-cp311-cp311-macosx_11_0_arm64.whl

Download URL	png2jxl-0.1.0-cp311-cp311-macosx_11_0_arm64.whl
Size	337.9 kB
Tags	CPython 3.11 macOS 11.0+ ARM64
SHA-256 checksum How to use checksums	`b01e8898eed6d277f1a4af10406cc14a2a0eed6b74c8826caa45e5a54f0587f4`
BLAKE2b-256 checksum How to use checksums	`7270403251d4ae4c2cd43978a48f7b968f1eb6ab5762b7e4f125cd6fcb1efafd`
Upload date	Aug 25, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/7.0.0 CPython/3.13.14`

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Publishing platform: GitHub Actions
Publishing repository: github.com/JiangJQ2000/png2jxl
Publishing commit: github.com/JiangJQ2000/png2jxl/tree/7682bede558b85b114d9b146e3b59013124e0fe3

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Publishing configuration: github.com/JiangJQ2000/png2jxl/blob/7682bede558b85b114d9b146e3b59013124e0fe3/.github/workflows/ci.yml
Publishing logs: github.com/JiangJQ2000/png2jxl/actions/runs/32858295000/attempts/2

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Subject: png2jxl-0.1.0-cp311-cp311-macosx_11_0_arm64.whl
SHA-256 checksum: b01e8898eed6d277f1a4af10406cc14a2a0eed6b74c8826caa45e5a54f0587f4 Verifying attestations

Release history Release notifications | RSS feed

0.2.0

Sep 24, 2026 13 release files

This release

0.1.0 This release

Aug 25, 2026 13 release files

png2jxl 0.1.0

png2jxl

Installation

Python API

Command line

Pillow integration

Supported PNGs

Limits and notes

Dependencies

Development

Key dates

1 maintainer

License expression

Requires

Provides Extra

Metadata

Key dates

1 maintainer

License expression

Requires

Provides Extra

Release files for png2jxl 0.1.0

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Release files / png2jxl-0.1.0.tar.gz

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Release files / png2jxl-0.1.0-cp314-cp314-win_amd64.whl

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Release files / png2jxl-0.1.0-cp314-cp314-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

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Release files / png2jxl-0.1.0-cp314-cp314-macosx_11_0_arm64.whl

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Release files / png2jxl-0.1.0-cp313-cp313-win_amd64.whl

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Release files / png2jxl-0.1.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

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Release files / png2jxl-0.1.0-cp313-cp313-macosx_11_0_arm64.whl

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Release files / png2jxl-0.1.0-cp312-cp312-win_amd64.whl

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Release files / png2jxl-0.1.0-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.whl

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Release files / png2jxl-0.1.0-cp312-cp312-macosx_11_0_arm64.whl

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