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Image Alpha Viewer

Inspect and download the alpha (transparency) channel of any image as a grayscale mask. Fully private, runs in your browser.

upload_file

クリックして選択 またはここにファイルをドラッグ＆ドロップ

Select an image

対応形式: image/*

関連ツール

PNG Transparency Cleaner

Clean noisy semi-transparent edges in PNG files. Threshold near-transparent pixels to fully transparent and near-opaque to fully opaque.

Color Replace Tool

Replace one color in an image with another. Adjustable tolerance for color distance. Fully private, runs in your browser.

Audio Metadata Viewer

View duration, sample rate, channels, bitrate, and ID3 tags of any audio file in your browser. Fully private.

Canvas Size Extender

Extend an image's canvas size by adding padding on each side. Solid color or transparent fill. Fully private.

テキストをPDFに変換

プレーンテキストをPDF文書に変換します。フォント、サイズ、ページレイアウトをカスタマイズできます。

PDF メタデータ編集

タイトル、著者、件名、キーワード、作成者などの PDF メタデータを表示・編集できます。

画像 DPI ビューア

任意の PNG または JPEG の DPI メタデータを確認。

apps

無料オンラインツールの全コレクションを見る。

Image Alpha Viewer

Extract and inspect the alpha (transparency) channel of any image as a high-contrast grayscale mask. White pixels are fully opaque; black pixels are fully transparent; intermediate grays represent semi-transparency.

Why it matters

Designers and developers often need to understand or extract the alpha channel separately — for masking, compositing, debugging exports, or generating selection masks for image editors.

Features

Renders alpha as a grayscale image
Reports total transparent pixel count and percentage
Downloadable PNG of the alpha mask
100% local processing

Use cases

Verify transparency in PNG/WebP exports
Extract alpha masks for editing software
Debug rendering issues with semi-transparent layers
Audit assets before publishing

Image Alpha Viewer

関連ツール

PNG Transparency Cleaner

Color Replace Tool

Audio Metadata Viewer

Canvas Size Extender

テキストをPDFに変換

PDF メタデータ編集

画像 DPI ビューア

もっと見る

Image Alpha Viewer

Why it matters

Features

Use cases