画像ツール
画像圧縮
JPG、PNG、WebPのサイズを指定して圧縮し、複数画像をZIPで保存します。
Compression settings
The tool searches for the best quality that stays at or below this size.
Choose one or more JPG, PNG or WebP images to begin.
ほとんどのツールはブラウザ内でローカル処理します。背景除去では選択した画像を設定済みサーバーで処理し、完了後に元画像を削除します。
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使い方
- Drop JPG, PNG or WebP files into the box, or choose them from your device.
- Set the maximum file size and output format, then select Compress All.
- Review each result and download individual images or a ZIP archive.
おすすめの用途
- Email attachments
- Website uploads
- Social media images
注意点
Images stay on your device. PNG compression cannot use a quality slider, so very detailed or transparent PNGs may not reach extremely small targets.
よくある質問
Are my images uploaded?
No. Decoding, resizing and encoding happen in your browser. Files, names and metadata are never sent to BrightTools.
Can I compress multiple images?
Yes. Select or drop multiple files, review the queue, then use Compress All. Processing is sequential to keep mobile browsers responsive.
Can I compress an image below 200KB?
Choose a smaller target such as 100 KB. The tool searches quality and then reduces dimensions when necessary.
Does compression reduce image quality?
Lower JPEG and WebP sizes require lower quality or dimensions. The tool chooses the highest quality that fits your target and never silently replaces an image with a larger file.
Why can’t a PNG reach the target size?
PNG is lossless and its size depends on image detail. We preserve the format and transparency and explain when the target is not realistic.
Can I download all images as a ZIP?
Yes. After successful processing, Download All as ZIP creates the archive entirely in your browser.