Image Format Converter は何をしますか？
Image Format Converter はブラウザ上でデータやファイルを変換するツールで、結果と制限を明確に示します。 検証済みの機能： PNG conversion, JPEG conversion, WebP conversion, AVIF capability detection.
Choose the output for the content
Use PNG for lossless graphics and alpha transparency, JPEG for widely compatible photos without transparency, WebP for efficient modern web delivery, and AVIF only after confirming encoder and target-browser support.
使い方
- Choose a PNG, JPEG, WebP, or browser-supported AVIF image.
- Select the output format and quality; the quality setting affects lossy encoders.
- Select Convert image, verify the MIME type and output size, then download the converted file.
実際の入出力例
Convert a PNG asset to WebP
入力
Source: logo.png, 1200 × 630
Output format: WebP
Quality: 90%出力
Dimensions: 1200 × 630 px
Format: image/webp
Download: logo-output.webpThe browser decodes the source, draws it to canvas, and encodes the same pixel dimensions as WebP.
一般的なエラーと対処
| 症状 | 原因 | 対処 |
|---|---|---|
| AVIF conversion reports that the browser cannot export the format. | Canvas AVIF encoding is not implemented in every browser. | Choose WebP, PNG, or JPEG, or use a browser that exposes AVIF canvas export. |
| Transparent areas change after JPEG export. | JPEG has no alpha channel. | Choose PNG or WebP to preserve transparency, or add a background before converting to JPEG. |
Important behavior of Image Converter
このツール固有の制限： JPEG removes transparency, and AVIF export availability varies by browser.
標準と実装の参考資料
- MDN — Web image file type and format guide (opens in a new tab)Compares browser image formats, compression, and transparency.
- MDN — HTMLCanvasElement.toBlob() (opens in a new tab)Documents the browser export API and format fallback behavior.
Image Converter — FAQ
Does the Image Converter upload my input?
No. Processing runs in the current browser tab, and the page does not send tool input to a KitLumi processing endpoint.
What input does the Image Converter accept?
It accepts one JPEG, PNG, WebP, or AVIF image supported by the current browser. The workspace checks the input and reports malformed or unsupported values before it produces a result.
What does the Image Converter produce?
It produces PNG, JPEG, WebP, or AVIF when the browser encoder supports it. Copy and download controls appear when the output format supports them.
What limitation should I know?
JPEG removes transparency, and AVIF export availability varies by browser.
更新内容
実質的な更新： Image Converter: Added PNG conversion, JPEG conversion, WebP conversion, AVIF capability detection, responsive controls, explicit runtime disclosure, and task-specific examples and limitations.