Resize images for Instagram
Hit Instagram’s actual dimensions — 1080 × 1080, 1080 × 1350 and 1080 × 1920 — instead of letting the app crop for you.
ここに画像をドロップ
またはクリックして選択
対応形式: JPG, PNG, WEBP, AVIF
ローカルで処理します。画像が端末の外に出ることはありません。
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Instagram re-encodes and crops whatever you give it. Upload something at the wrong aspect ratio and the app decides what to cut — usually taking the top off a head or trimming the edge of a product.
Sizing the image yourself first means you decide the framing, and the upload arrives at exactly the dimensions Instagram wants. The three that matter: 1080 × 1080 for a square post, 1080 × 1350 for the tall 4:5 feed post that takes up the most screen space, and 1080 × 1920 for stories and reels.
できること
All three feed sizes
Square, 4:5 portrait and 9:16 story presets, one click each.
You control the crop
Frame the image yourself rather than letting the app choose what to cut off.
Correct dimensions on upload
A correctly sized image avoids one extra round of Instagram’s own resampling.
No account, no watermark
It runs in your browser. There is nothing to sign up for and nothing stamped on the result.
使い方
- 1
Load your photo
The editor opens preconfigured for an Instagram post.
- 2
Pick the format
Square post, 4:5 portrait or 9:16 story. Switch between them freely to compare.
- 3
Frame and export
Adjust the crop, then download as JPEG — Instagram’s preferred input for photographs.
KaiConvert を選ぶ理由
- ローカルツールはアップロード不要
- ページ読み込み後はオフラインでも動作
- クラウド AI は開始前に必ず明示