Redact an Image Online
Draw solid black bars over sensitive text or details — flattened into the file, free, and right in your browser.
ぼかす画像をドロップ
ドラッグ＆ドロップ、貼り付け、またはファイルを選択
PNG · JPG · WebP · GIF · BMP — お使いのデバイスで処理
Redaction removes detail for good
Redacting means covering sensitive information with a solid, opaque bar — the black rectangles you see on released documents. Unlike a blur or a mosaic, a redaction bar replaces the pixels underneath entirely, so there is nothing left to reconstruct. It's the right choice for account numbers, signatures, addresses, and anything confidential.
Drag a bar over each detail you want gone. The default colour is black, but you can pick any colour to match the document. When you download, the bars are flattened into a single image — there are no hidden layers, so the redacted content can't be peeled back from the saved file.
How to redact an image
- Open your image or screenshot. Drag it onto the tool, choose a file, or paste it.
- Bar each detail. With Redact selected, drag a solid bar over every piece of sensitive information.
- Download the flattened file. Click Download — the bars are baked into the image, with nothing recoverable beneath.
Why a bar beats a blur
Blurred and pixelated text has occasionally been reversed by determined attackers, because some original information survives. A solid redaction bar leaves nothing behind — for anything that truly must stay secret, redact rather than blur.
redact imageの仕組み
- 何をするか
- 不透明なベタ塗りの黒塗りバー
- ツールの処理方法
- 本ツールはその領域に、選んだ色（既定では黒）のベタ塗り長方形を描き、下のピクセルを完全に上書きします。公開された文書で見かける、あの不透明なバーと同じものです。
- 何のためのものか
- 黒塗りは本当に機密のもの—口座番号、署名、完全な住所、公的な身分証—など、読むことも復元することも不可能でなければならないものに適した選択肢です。
- 元に戻せるか？
- ぼかしやモザイクと違い、ベタ塗りバーは下のピクセルを完全に置き換え、ダウンロード時にファイルへ統合されるため、本当に復元できるものは何も残りません。
ヒント： 縮小したコピーではなく原寸の元画像を黒塗りし、別の編集レイヤーに黒い箱を置くだけにしないでください。統合してください。本ツールはダウンロード時に自動でそれを行います。
More ways to blur & hide
よくある質問
Is redaction safer than blurring?
Yes. A solid bar replaces the pixels completely, so there is no underlying detail to recover — unlike a blur or pixelation, which can sometimes be partly reversed.
Can the black bar be removed from the file?
No. When you download, the bar is flattened into the image. There are no separate layers, so the covered content is gone from the saved file.
Can I use a colour other than black?
Yes. The bar is black by default, but you can pick any colour with the bar-colour picker to match your document.
Where is my image processed?
The blurring happens in your browser, so the new file is created on your own device. How any data associated with the tool is handled is described in our privacy policy.
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