免費線上影像格式轉換器
無需桌面軟體即可切換影像格式 - 上傳 PNG、JPEG、WebP、GIF、BMP、AVIF、TIFF 或 ICO 並下載為 PNG、JPEG、WebP 或 AVIF（當您的瀏覽器支援時 AVIF 匯出時AVIF 時。
使用滑桿調整 JPEG/WebP/AVIF 品質。一切都在您的瀏覽器本地運行；文件永遠不會上傳到 Dokall 伺服器。
Frequently Asked Questions
Which formats can I convert between?
Input: PNG, JPEG, WebP, GIF, BMP, AVIF, TIFF, ICO. Output: PNG, JPEG, WebP, and AVIF (when your browser supports AVIF encoding). Not all input formats support all output formats.
Does conversion reduce image quality?
PNG and WebP lossless modes preserve quality. JPEG, WebP lossy, and AVIF use compression that may reduce quality. Adjust the quality slider to balance file size and visual fidelity.
Can I convert multiple images at once?
Upload and convert images one at a time. For batch conversion of many files, dedicated desktop tools or command-line utilities like ImageMagick are more efficient.
Is my image uploaded to a server?
No. Conversion uses the browser Canvas API. Images are processed locally and never sent to Dokall servers.
Why is AVIF output not available?
AVIF encoding depends on browser support. Chrome and Firefox support AVIF export in recent versions. Safari added support in later releases. If AVIF is unavailable, use WebP as a modern alternative with wide support.