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JPEG XL — Next-Generation Image Codec

Open Beta

.jxl · image/jxl

JPEG XL (.jxl) is a raster successor to classic JPEG, standardised as ISO/IEC 18181 in 2022. On osm2cdr.ru the map is rendered to PNG and then encoded to JPEG XL by whichever encoder is available — a Pillow plugin, the jxlpy library, or the cjxl CLI tool. The format is royalty-free and supports lossless mode, HDR and high bit depth. It is a finished map image, not editable layers. The main caveat is browser fragmentation: Safari supports it natively while Chrome removed support in 2023, so today JPEG XL fits archival and offline use better than web embedding.

今すぐJPEG XLをエクスポート ✨ オープンベータ — 無料、制限なし

主な機能

✓ISO/IEC 18181 standard, royalty-free, libjxl reference implementation

✓Lossy and lossless modes, HDR support and 8–32 bits per channel

✓Encoder chain: pillow-jxl → jxlpy → cjxl CLI with graceful fallback

✓Configurable quality and encoding effort (default quality 90)

✓A raster snapshot of the map — layers are not editable

Example JPEG XL export (central Moscow, 1x0.5 km) — Example: central Moscow, ~1×0.5 km, medium detail

JPEG XLフォーマットについて

JPEG XL is a raster format standardized as ISO/IEC 18181 and conceived as the successor to ordinary JPEG. It compresses harder at the same quality, supports a lossless mode, wide color depth and HDR, and is free of licensing royalties.

A map is taken as .jxl for the sake of weight: a high-resolution poster is stored more compactly than PNG, and the quality stays. A separate scenario is repacking JPEGs you already have: the format can squeeze them without recompressing the image anew.

With us the map is first rendered to PNG and then encoded to JPEG XL by whichever encoder is present in the system: the Pillow plugin, the jxlpy library or the cjxl command-line tool. The default quality is 90 — lossy compression that is visually indistinguishable from the original; a lossless mode is available too. The file holds a finished image of the map, not editable layers.

The main caveat is browser support. Safari opens .jxl natively, Firefox only behind a flag, and Chrome removed support in 2023. So for a website WebP, AVIF or plain PNG is the safer bet, while JPEG XL fits archiving, offline viewing and storage.

JPEG XLファイルを開けるプログラム

次のプログラムおよびアプリケーションは、OSM2CDRからエクスポートしたJPEG XL — Next-Generation Image Codec（.jxl）ファイルを開き、編集し、利用できます：

💻Safari 💻GIMP 💻ImageMagick 💻XnView MP 💻libjxl (cjxl/djxl)

Format specifications

Open standard
2D only
Lossy compression
No attributes
Output: 1 file
A single .jxl encoded from PNG by whichever encoder is present (pillow-jxl -> jxlpy -> cjxl CLI); ISO/IEC 18181, royalty-free, default quality 90 (lossy by default).

JPEG XL地図を利用するユーザー

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Archival storage of high-resolution map posters at a small file size

A high-resolution poster takes up less space with no visible loss of quality.

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Offline viewing of maps where format support is guaranteed

A format for local storage where you do not have to guess the recipient's browser.

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Lossless copies of exports where bit-exact pixel preservation matters

The lossless mode keeps every pixel at a smaller size than PNG.

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Repacking existing JPEGs into .jxl to save space without quality loss

Existing JPEGs are squeezed into .jxl without recompressing the picture again.

JPEG XLのエクスポート方法

範囲を選択

osm2cdr.ruのインタラクティブ地図上で長方形またはポリゴンを描画します

JPEG XLを選択

利用可能な127種類のエクスポートフォーマットの一覧からJPEG XL — Next-Generation Image Codecを選択します

エクスポート

「エクスポート」をクリックすると、1〜5分で.jxlファイルを受け取れます

ダウンロード

完成したJPEG XLファイルをダウンロードし、Safariで開きます

エクスポート後の開き方

Viewing — GIMP, XnView MP or Safari open .jxl with no extra setup.
libjxl — the djxl command-line tool turns the file back into PNG with djxl map.jxl map.png, if the receiving program does not know the format.
ImageMagick — the command magick map.jxl map.png for batch conversion; support depends on whether your ImageMagick was built with the JPEG XL delegate.
For a website — serve the picture as WebP or AVIF and keep the .jxl as an archive copy: not every browser opens it today.

JPEG XLの人気地図

フリー