ナレッジハブ・技術ガイド
EXIFメタデータ削除・写真プライバシー保護
EXIFメタデータ削除・写真プライバシー保護
本ツールは100%クライアントサイド（ブラウザ内）で動作します。写真、動画、音声、PDFファイルが外部サーバーにアップロードされることは一切なく、お使いの端末のメモリ内で安全に処理されます。
コアアーキテクチャ & 計算式
Scrubbed Image = Original Byte Stream - [APP1 EXIF Segment (0xFFE1)]
In a JPEG file, EXIF data is contained within a specific binary segment (APP1). The scrubber simply identifies the start and end markers of this segment and drops those bytes entirely, leaving the raw image data perfectly intact.
ベストプラクティスとガイドライン
- Scrub Before Uploading: Never upload a raw photo taken inside your home to an online forum or marketplace. Malicious actors can extract the exact latitude and longitude to find your physical address.
- Don't Rely on Social Media: While major platforms like Instagram strip EXIF data automatically, email clients (like Gmail or Outlook) and text messaging apps (like iMessage) often send the full unscrubbed original file.
- Understand the Limits of Scrubbing: Scrubbing removes hidden metadata, but it does not remove visual data. If you take a photo with a visible street sign or unique landmark in the background, your location is still compromised.
よくある質問 (FAQ)
Does scrubbing reduce the image quality?
No. Scrubbing is a lossless operation. It simply deletes text data from the file header; it does not touch, re encode, or compress the actual visual pixel data.
Can scrubbed data be recovered?
Once the bytes are deleted and the file is overwritten, the EXIF data is mathematically gone. However, if you have a backup of the original photo on your phone, that copy still contains the data.
Does this remove watermarks?
No. A watermark is visual pixel data baked into the image. EXIF data is invisible text metadata hidden in the file structure.