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WebP — Google Web Image Format

Open Beta

.webp · image/webp

WebP is Google's open raster format built on the VP8 video codec (lossy) and its VP8L extension (lossless). On osm2cdr.ru the map is rendered to PNG and then transcoded to WebP via Pillow. In lossy mode the file is 25–35% lighter than JPEG; in lossless mode 26% lighter than PNG. WebP supports transparency and works in every mainstream browser. It is a finished map image, not editable layers — a handy lightweight format for previews and thumbnails, but not a replacement for GeoTIFF in full-size cartographic export.

今すぐWebPをエクスポート ✨ オープンベータ — 無料、制限なし

主な機能

✓Two modes: lossy (VP8) and lossless (VP8L), selectable at export

✓Alpha channel and transparency support

✓Configurable quality 0–100 (default 80)

✓RIFF container, royalty-free BSD licence, MIME type image/webp

✓Compatible with all modern browsers (Chrome, Firefox 65+, Safari 14+)

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

WebPフォーマットについて

WebP is Google's raster format, grown out of the VP8 video codec. It works in two modes: lossy, when weight matters, and lossless, when pixel accuracy matters. Transparency is supported by both modes, and WebP is displayed by every current browser.

For maps this is a screen format: a preview in a catalog, a picture in an article, an asset in a mobile app. Where PNG weighs more than it should and JPEG blurs thin road lines and labels, WebP gives a reasonable compromise between weight and readability.

The map is rendered to PNG and then re-encoded into WebP: lossy mode and quality 80 by default, or lossless mode with exact pixel reproduction if you prefer. This is a finished image: layers are not editable and there are no coordinates inside. For a print house take TIFF or PDF, for a GIS — GeoTIFF.

WebP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WebP — Google Web Image Format（.webp）ファイルを開き、編集し、利用できます：

🌐Google Chrome 🌐Mozilla Firefox 💻GIMP 💻ImageMagick 🎨Adobe Photoshop

Format specifications

Open standard
2D only
Lossy compression
No attributes
Output: 1 file
A single WebP transcoded from PNG via Pillow; lossy VP8 by default (~25-35% lighter than JPEG) with an optional lossless VP8L mode, alpha supported.

WebP地図を利用するユーザー

🏗

Map previews and thumbnails on web pages to save bandwidth

A map preview in a catalog or a feed: the page loads noticeably faster than with PNG.

💻

Responsive images via the <picture> tag with JPEG/PNG fallback

Responsive layout through the picture tag — modern browsers take WebP, the rest get the fallback PNG.

📊

Map assets in mobile apps to reduce bundle size

Map assets in a mobile application: the build gets lighter with no loss of readability.

🎨

Lossless WebP for tiles with transparency and flat-colour areas

Lossless mode for pictures with transparency and large areas of flat color.

WebP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

WebP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WebP — Google Web Image Format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.webpファイルを受け取れます

ダウンロード

完成したWebPファイルをダウンロードし、Google Chromeで開きます

エクスポート後の開き方

A browser — just open the file: Chrome, Firefox, Edge and Safari 14 and newer display WebP without plugins.
A web page — <picture><source srcset="map.webp" type="image/webp"><img src="map.png" alt="map"></picture>: older clients will get the fallback PNG.
GIMP, Affinity Photo, Photoshop 2022 and newer — they open and save WebP; handy for cropping the picture or adding a caption.
ImageMagick or cwebp — re-encode to your own requirements: magick map.webp -quality 70 out.webp, or cwebp -lossless for exact pixel reproduction.
Not for print — this is an RGB picture for the screen; for a print house take TIFF, CMYK TIFF or PDF.

WebPの人気地図

フリー