JPG、PNG、WebP、AVIF、HEIC画像をアップロード。

画像リサイズ、HEIC変換、Web向け書き出しを数ステップで行えます。

Step 1

Add image

Upload a file or switch to a link icon if needed.

Max 25 MB

Drag and drop your image or

File should be JPEG, JPG, PNG, WEBP, AVIF, HEIC, or HEIF and no larger than 25 MB.

Alternate sources

Use icons only to switch between Google Drive, Dropbox, and direct image URL.

Step 2

Quick resize

Pick one option

Pick the easiest resize option for this image.

PresetCustom dimensionsPercentageKeep original size

Step 3

Final output

Final step

Choose format, adjust quality, and process the image.

QualityDefault 100

Guest uploads are enabled. Sign in later if you want saved history and dashboard access.

無料オンライン画像リサイズ

画像をリサイズしてHEIC写真をオンライン変換

Smart Image Resizer and Converterは、Webサイト、SNS、ショップ向けに画像をリサイズ、圧縮、変換します。

プリセット、ピクセル、割合、元サイズで画像をリサイズ

HEICとHEIF写真をJPG、PNG、WebP、AVIFへ変換

Web、SNS、ストア、メール向けに画像を最適化

画像ツール

画像のリサイズ、圧縮、変換を一か所で

Use Smart Image Resizer and Converter as a fast online image converter for HEIC photos, web assets, social media graphics, marketplace images, and lightweight downloads.

Resize Images Online

Quickly resize photos, product images, social graphics, banners, and thumbnails with presets or custom dimensions.

Convert HEIC To Web Formats

Upload HEIC and HEIF photos from iPhone or iPad, then export them as JPG, PNG, WebP, or AVIF for easier sharing.

Private, Safe Processing

Image files are size-limited, type-checked, processed server-side, and delivered through safe result links.

Fast Image Compression

Choose efficient output formats and quality settings to reduce file size while keeping images sharp.

FAQ

画像リサイズとHEIC変換のFAQ

Quick answers about supported image formats, HEIC uploads, online resizing, and export options.

Can I resize HEIC photos from my iPhone?+

Yes. Smart Image Resizer and Converter accepts HEIC and HEIF uploads when the server image library can decode them, then converts them into common web formats.

Which image formats can I upload?+

You can upload JPG, JPEG, PNG, WebP, AVIF, HEIC, and HEIF images from your device, plus supported public image links.

What formats can I export?+

You can export resized images as WebP, JPG, PNG, or AVIF so they work well for websites, social posts, stores, and downloads.

Can I use it without creating an account?+

Yes. Guest uploads can work right away when they are enabled, while signing in adds saved history, dashboard access, and plan-based limits.

Can I keep aspect ratio locked while resizing?+

Yes. Aspect ratio locking stays available in the custom-dimensions mode so you can scale safely without stretching the image.

Where do processed files go after export?+

Processed assets are stored by the app and exposed through safe result and download routes rather than raw server file paths.