如何調整社群媒體圖片尺寸：Instagram、YouTube、Twitter、LinkedIn
使用免費的瀏覽器工具，為 Instagram 貼文、YouTube 縮圖、Twitter 卡片和 LinkedIn 個人檔案取得正確的圖片尺寸，並讓你的檔案保持私密。
每個社群平台都有建議的圖片尺寸。以正確的尺寸上傳圖片，有助於內容正確顯示，並避免尷尬的裁切或畫質流失。
社群媒體圖片尺寸參考
| 平台 | 用途 | 建議尺寸 | 長寬比 |
|---|---|---|---|
| 動態正方形 | 1080x1080 px | 1:1 | |
| 動態直式 | 1080x1350 px | 4:5 | |
| 限時動態 / Reels | 1080x1920 px | 9:16 | |
| YouTube | 縮圖 | 1280x720 px | 16:9 |
| YouTube | 頻道橫幅 | 2048x1152 px | 16:9 |
| Twitter / X | 貼文卡片（大圖） | 1200x675 px | 16:9 |
| Twitter / X | 個人檔案標頭 | 1500x500 px | 3:1 |
| 貼文圖片 | 1200x627 px | 1.91:1 | |
| 橫幅 | 1584x396 px | 4:1 | |
| 個人頭像 | 400x400 px | 1:1 | |
| 動態圖片 | 1200x630 px | 1.91:1 | |
| 個人頭像 | 180x180 px | 1:1 | |
| 釘選圖 | 1000x1500 px | 2:3 |
如何調整社群媒體圖片尺寸
- 使用 圖片調整尺寸工具 設定精確的像素尺寸。
- 鎖定長寬比，避免變形。
- 照片匯出為 JPG 或 WebP，含文字或標誌的圖形則匯出為 PNG。
- 若圖片需要特定裁切，先用 圖片裁切工具。
- 上傳前，用 圖片壓縮工具 處理結果以縮減檔案大小。
打造更好社群媒體圖片的訣竅
- 從你需要的最大尺寸開始。 若同一張圖要發到 Instagram、Twitter、LinkedIn，請分別為每個平台調整尺寸。
- 使用高密度來源。 Retina 螢幕受益於 2 倍來源圖片。若貼文以 600px 寬顯示，請匯出 1200px 的檔案，讓高解析度裝置顯示更銳利。
- 檢查文字位置。 社群平台可能會在圖片上疊加文字、圖示或個人檔案徽章。請將重要內容遠離邊緣。
- 在不明顯損失下壓縮。 過大的 PNG 對社群貼文來說可能不必要地笨重。使用 圖片壓縮工具 匯出較輕量的 WebP 或 JPG 版本。
調整前後
將圖片從相機原始解析度（例如 4000x3000px）縮減到社群媒體尺寸，在壓縮開始前就能減少 80–90% 的檔案大小。這能加快上傳速度、節省頻寬，並讓你的內容更快出現在動態中。
常見問題
Instagram 貼文應該用什麼尺寸？
1080x1080px 的 1:1 正方形適用於大多數的動態貼文。1080x1350px 的直式貼文和 1080x1920px 的限時動態也相當常見。
YouTube 縮圖的尺寸是多少？
1280x720px 是標準的 YouTube 縮圖尺寸，長寬比為 16:9。
Twitter 卡片圖片應該用什麼尺寸？
Twitter 建議大型圖片的摘要卡片使用 1200x675px（16:9 比例），一般摘要卡片使用 800x418px。
社群平台會調整我的圖片尺寸嗎？
會。平台通常會壓縮並重新編碼上傳的圖片。上傳正確的尺寸能減少不必要的裁切與畫質流失。
我可以在瀏覽器中於本機調整圖片尺寸嗎？
可以。ImgKit 圖片調整尺寸工具會在瀏覽器中於本機處理支援的檔案。
Resources
參考資源
利用這些參考資源，在指南、對應的支援頁面與內容製作者之間切換。
Compress JPG, PNG, and WebP images locally with quality controls.
開啟工具Image Resize ToolResize images to exact pixel dimensions with local browser processing for supported files.
開啟工具Image CropperCrop images with free, square, portrait, landscape, and social media presets.
開啟工具網站最佳圖片尺寸：實用指南在不浪費頁面載入量的前提下，為網站主視覺、部落格圖片、產品照片、縮圖與 Retina 螢幕挑選實用的圖片尺寸。
閱讀指南如何在不變形的情況下調整圖片尺寸了解長寬比、裁切、拉伸和目標尺寸如何影響圖片縮放品質。
閱讀指南Leon PatelCreates how-to guides and photo tips that keep the advice simple, clear, and ready to use in Gift Studio.
查看作者Dylan RossChecks guides and photo tips for freshness, usefulness, and a calm editorial voice.
查看審閱者開啟 Gift StudioApply the guide in the editor when you are ready to make the gift.
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