imageresize.co について

imageresize.co は、ブラウザ内で直接画像をリサイズ、圧縮、変換できる無料のオンライン画像処理ツールです — アップロード不要、登録不要、制限なし。

すべての処理はCanvas APIを使用してデバイス上でローカルに行われるため、画像がコンピュータから外に出ることはありません。

JPEG、PNG、WebP、TIFF、HEIC、AVIFに対応。ピクセル単位でリサイズ、KBターゲットに圧縮、またはフォーマット変換が可能です。

ImageResize.co supports 25 languages and is accessible worldwide. The interface adapts to right-to-left scripts for Arabic and Persian users, and uses language-specific fonts for scripts such as Devanagari, Chinese, Japanese, Korean, Bengali, and Thai.

We believe powerful image tools should be accessible to everyone, everywhere, for free. That is why ImageResize.co requires no account, no credit card, and no software download. Open the site, select your images, and get results in seconds.

What You Can Do with ImageResize.co

Resize images to exact pixel dimensions or percentages

Compress images to a target file size (10KB to 1MB)

Convert between JPG, PNG, WebP, HEIC, AVIF, and TIFF

Upscale and enlarge images up to 4× the original size

Batch-process multiple images in one session

Resize to social media presets: Instagram, Facebook, WhatsApp

Create passport photos in 35×45mm or 2×2 inch formats

All processing runs in your browser — zero server uploads

もっと無料の画像ツール

画像リサイズ

Resize images to exact pixel dimensions. Supports batch processing and aspect ratio lock.

画像圧縮

Compress images by quality level or to a target file size in KB/MB.

画像拡大

Enlarge images up to 4× their original size using bicubic resampling.

画像縮小ツール

Reduce image dimensions while preserving visual quality.

変換

Convert between JPG, PNG, WebP, HEIC, AVIF, and TIFF formats.

100KBに圧縮

Compress any image to under 100KB — perfect for online forms and email.

パスポート 35×45mm

Resize photos to the standard 35×45mm passport size at 300 DPI.

JPG → PNG

Convert JPG to PNG with transparency support — lossless.

背景削除

Remove image backgrounds instantly using AI — free, no upload needed.

Questions or feedback?

Reach us at our contact page or email us directly at [email protected].