Blur an Image Online
Soften a face, a background, or a sensitive detail with an adjustable blur — 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
Why blur an image?
Blurring is the gentle way to hide something in a photo. A soft blur over a face, a house number, or a name in the background keeps the overall picture looking natural while making the obscured part unreadable. It's perfect for sharing a screenshot or holiday photo without exposing strangers, addresses, or private notes.
This tool uses a true Gaussian-style blur with a strength slider, so you control exactly how much detail disappears. You can blur the whole image at once or drag a box over just the part you want to soften — everything else stays sharp and full-resolution.
How to blur an image
- Open your image. Drag a photo onto the tool above, choose a file, or paste from your clipboard.
- Pick what to blur. Choose Selected areas and drag a box over each part to hide, or switch to Whole image to soften everything.
- Set the strength. Slide the blur strength up until the detail is gone, then download in your original format.
Blur enough to truly hide
A light blur can sometimes be reversed by software. If the detail is genuinely sensitive — a face you must not reveal, an account number — push the strength high, or use the Redact bars to paint over it completely.
blur imageの仕組み
- 何をするか
- 調整可能なガウス風ぼかし
- ツールの処理方法
- 本ツールは選択したピクセルに対して分離可能なボックスぼかしを3回かけ、本物のガウスぼかしに非常に近い結果を出します。さらに端をクランプ処理するため、ぼかしがボックスの外へにじみ出ることはありません。
- 何のためのものか
- やわらかいぼかしは、共有前に背景の顔、表札の番号、街路標識、画面上の名前を読めなくしつつ、写真を自然な見た目に保つのに最適です。
- 元に戻せるか？
- ぼかしは下のピクセルを削除するのではなく平均化するため、弱いぼかしはソフトウェアで部分的に元へ戻せることがあります。本当に機微な対象には強度を高くしてください。
ヒント： 全拡大しても本当に細部を判読できなくなるまで強度を上げてください。まだうっすら読めるなら、それはまだ隠せていません。
More ways to blur & hide
よくある質問
How do I blur just part of an image?
Choose Selected areas and drag a rectangle over the part you want to hide. Add as many boxes as you need; the rest of the image stays sharp.
Is a blurred area really hidden?
A strong blur makes a face or text unreadable. For information that must never be recovered, use a very high strength or switch to the Redact (solid bar) mode.
Does blurring lose quality elsewhere?
No. Only the blurred area changes; the rest of the image stays at full resolution. The blur is baked in when you download.
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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