Which image formats are supported?

Supports conversion between JPEG, PNG, WebP, AVIF, BMP, and ICO. Convert legacy BMP files to modern WebP or AVIF to reduce file size, or convert any image to ICO for use as a website favicon.

How many images can I batch-convert at once?

You can upload and convert multiple images simultaneously with no hard limit. For smooth browser performance, converting up to 20 images at a time is recommended. Download all results as a single ZIP archive.

Will image quality degrade after conversion?

You control the compression quality (1–100%). PNG is lossless — no quality loss. JPEG, WebP, and AVIF use lossy compression; at 90% quality the difference is imperceptible to the human eye while the file size can be 50–80% smaller.

Are my images uploaded to any server?

No. All conversion happens entirely inside your browser using the Canvas API. Your images never leave your device — there is no server, no cloud storage, and no tracking. This makes it safe to convert sensitive or confidential images.

What is the difference between WebP, AVIF, and JPEG?

WebP is typically 25–35% smaller than equivalent-quality JPEG. AVIF achieves even better compression — up to 50% smaller — and supports transparency and animation. Both are supported in all modern browsers. For new web projects, WebP or AVIF are recommended over JPEG for better performance.

線上圖片格式轉換工具

免費線上圖片轉換工具，支援 JPEG、PNG、WebP、AVIF、BMP 等常見格式互轉，可調整壓縮品質與批次處理。所有處理均於瀏覽器端完成，不上傳任何檔案，100% 保護隱私。

拖曳圖片到這裡

或點擊選擇檔案 · 也可以 Ctrl+V 貼上

支援 JPEG、PNG、WebP、GIF、BMP、AVIF、SVG

常見問題

支援哪些圖片格式互轉？

支援 JPEG、PNG、WebP、AVIF、BMP、ICO 等主流格式互轉。可將舊版 BMP 轉為現代的 WebP 或 AVIF 以減少檔案大小，也支援轉為 ICO 用於網站 Favicon。

批次轉換時可以處理幾張圖片？

支援一次上傳並批次轉換多張圖片，數量無硬性限制，但建議一次不超過 20 張以確保瀏覽器效能流暢。

圖片轉換後畫質會變差嗎？

可自訂壓縮品質（1–100%）。PNG 為無損格式；JPEG/WebP/AVIF 為有損壓縮，品質設為 90% 以上時肉眼幾乎看不出差異。

圖片會上傳到伺服器嗎？

完全不會。所有轉換均在您的瀏覽器本地端執行，圖片不會離開您的裝置，100% 保護隱私。

WebP 和 AVIF 比 JPEG 好在哪裡？

WebP 通常比同畫質的 JPEG 小 25–35%；AVIF 更可小 50% 以上，且支援透明度與動畫。現代瀏覽器均支援這兩種格式，建議新專案優先使用 WebP 或 AVIF。

線上圖片格式轉換工具

圖片格式轉換

常見問題

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