PNGを圧縮 — 無料・オンライン・アップロード不要
Drop a PNG into PicBrewery and download a smaller lossless PNG — optimized with oxipng in your browser. No upload, no watermark, no account.
Compare PNG trade-offs on the formats hub.
PNGの圧縮方法
- PicBreweryを開く。
- Drop your
.pngfile (or several) on the drop zone. - Wait for the results row. The PNG column is oxipng-optimized — same pixels, fewer bytes.
- Download from the PNG cell or use Download all as ZIP.
Lossless PNG optimization
PicBrewery uses oxipng for PNG output — lossless DEFLATE recompression, palette quantization where applicable, and metadata stripping. Visual pixels do not change.
Screenshots and UI assets with flat colors often shrink 20–50%. Photographic PNGs (rare but possible) may see smaller gains because PNG is the wrong codec for photos.
WebP/AVIFがPNGより有利な場合
Web配信ではlossy WebP/AVIF（アルファ付き）がPNGより小さいことが多い。PicBreweryですべて並べて比較。PNG→WebPまたはAVIFを圧縮。
よくある質問
Is PNG compression lossless in PicBrewery?
Yes — oxipng recompresses PNG without changing pixels. What you see is what you get.
Will transparency survive?
Yes. Alpha channels are preserved in the PNG output.
Why is my PNG still large?
PNG is lossless — photographic content belongs in JPEG, WebP or AVIF. If you need smaller files and can accept lossy compression, check the WebP or AVIF columns.
WebPではなくSVGを残すのはいつ？
No; metadata is stripped during optimization.
Can I batch-compress PNGs?
Yes — up to 20 files per batch with ZIP download.
PNGを今すぐ圧縮
Drop PNG files into PicBrewery and download optimized PNGs. Client-side only.