無料オンライン画像リサイザー

画像を選択

またはここにドラッグ＆ドロップ

🔒 安全なアップロード JPG · PNG · WEBP 最大 5 MB

100% 安全

画像は安全にアップロードされ、第三者と共有されることはありません。

画質ロスなし

高度なアルゴリズムにより、サイズ変更時に最高画質を維持します。

超高速

数秒でリサイズ完了。ソフトウェアのインストールは不要です。

すべての画像ツール

リサイズ、圧縮、変換、編集、保護などの全ツールが完全無料でご利用いただけます。

画像リサイザー

正確な寸法に画像を簡単サイズ変更。

一括画像リサイズ

複数の画像を一度にまとめてリサイズ。

JPGリサイズ

JPG形式の画像を簡単にリサイズ。

Resize JPEG

Easily resize JPEG image files.

Resize PNG

Easily resize PNG image files.

Resize WebP

Easily resize WebP image files.

画像サイズ変更(KB指定)

目標のファイルサイズ(KB)で画像を調整。

Resize JPG to 10MB

Easily resize your JPG images exactly to 10MB.

画像圧縮

画像の画質を保ったまま容量を削減。

HEICツール

Apple HEICファイルの変換と管理。

HEICからJPG

HEICを標準的なJPGに変換。

HEICからJPEG

HEICを標準的なJPGに変換。

HEICからPNG

HEICを透過PNGに変換。

HEICからPDF

HEICをPDFファイルに変換。

HEICからJPG (Windows)

WindowsでHEIC写真を簡単にJPG変換。

PNGからJPG

透過PNGを通常のJPG写真に変換。

PNGからPDF

PNG画像をPDFドキュメントに変換。

PNGからSVG

PNG形式をベクターSVG形式に変換。

PNGからICO

PNG画像をファビコン用ICOファイルに変換。

JPGツール

JPGのファイル管理および変換ツール。

JPGからWebP

JPG画像をWebPに一瞬で変換。

JPGからPDF

JPG画像をPDFファイルに変換。

JPGからBMP

JPG画像をBMP形式に変換。

WEBPツール

WebP画像の変換と最適化。

WebPからJPG

WebP画像をJPG写真に変換。

WebPからJPEG

WebP画像をJPEG写真に変換。

WebPからPDF

WebP画像をPDFファイルに変換。

WebPからPNG

WebP形式を透過PNG形式に変換。

PDFからJPG

PDFの各ページをJPG画像に変換。

SVG to React Converter

Transform raw SVG code into reusable React components.

画像切り抜き

オンラインで画像をトリミング。

反転機能

画像を左右または上下に反転。

回転機能

画像を好みの角度に回転。

画像フィルター

おしゃれなエフェクト・加工を適用。

文字入れ機能

写真の上にテキストや注釈を追加。

透かし追加

コピー防止用のロゴ・テキストを追加。

コラージュ作成

複数の写真を1枚のおしゃれな画像に。

画像拡大

粗さを出さずに写真をきれいに引き伸ばす。

比率計算ツール

縦横比やリサイズ後の寸法を計算。

メタデータ閲覧

カメラなどの撮影情報(EXIF)を確認。

EXIFデータ削除

個人情報保護のため画像情報を削除。

カラーピッカー

画像の色からHEXコードを抽出。

画像Base64変換

画像をBase64テキストデータに変換。

ファビコン作成

アイコンやファビコンを簡単作成。

SVG Optimizer

Optimize your SVG vector files for improved web performance.

SVG Minifier

Minify SVG code by removing unnecessary spaces, comments, and tags.

SVG Cleaner

Clean up tracking data and metadata from your exported SVG files.

SVG Compressor

Compress vector images to reduce file sizes instantly without losing quality.

SVG Color Changer

Easily modify or replace colors inside your SVG files online.

SVG Path Simplifier

Simplify complex path anchor points to streamline vector performance.

SVG Sprite Generator

Combine multiple individual SVG assets into a single optimized sprite sheet.

Data URI Generator

Convert images or files into Data URI strings instantly.

CSS Background Image Generator

Generate responsive CSS background code.

CSS Sprite Generator

Combine multiple images into a single CSS sprite sheet.

Instagram Tools

Access free Instagram tools to resize photos, split carousel images, create profile pictures, and optimize content for every Instagram format.

Resize Image to 2KB

Quickly compress and resize your images to exactly 2KB for fast uploads.

Resize Image to 10KB

Resize your images to exactly 10KB instantly for faster website uploads..

Resize Image to 20KB

Effortlessly compress your images to exactly 20KB for optimized web performance.

Resize Image to 30KB

Optimize images to exactly 30KB to ensure your pages load at lightning speed.

Resize Image to 40KB

"Perfectly compress your images to 40KB for rapid, efficient uploads

Resize Image to 50KB

"Stop struggling with file limits. Convert your images to exactly 50 KB and upload with confidence.

Resize Image to 100KB

Boost page performance by shrinking your images to a precise 100KB.

Resize Image to 150KB

Optimize your images to exactly 150KB for a perfect balance of quality and speed.

Resize Image to 200KB

Achieve a 200KB file size instantly, ensuring your website stays lightning-fast.

Resize Image to 250KB

Compress images to 250KB effortlessly without sacrificing visual clarity.

Resize Image to 350KB

Get your files down to 350KB in one click for smoother, faster web uploads.

Resize Image to 400KB

Scale your images to 400KB, the ideal size for efficient and professional web display.

Resize Image to 450KB

Downsize your images to exactly 450KB to ensure rapid loading times every time.

Resize Image to 500KB

Easily reach a 500KB file size for better performance and reduced storage usage.

Resize Image to 550KB

Optimize any photo to exactly 550KB with our fast and reliable compression tool.

Resize Image to 650KB

Keep your site snappy by limiting image files to 650KB without losing detail.

Resize Image to 700KB

Quickly convert your large images to 700KB for optimized web performance.

Resize Image to 800KB

Shrink images to 800KB to maintain high quality while improving page speed.

Resize Image to 850KB

Professional compression: get your images to exactly 850KB for better speed.

Resize Image to 950KB

Perfectly sized at 950KB—because every kilobyte counts for your page speed.

Resize Image to 1MB

Downsize your high-resolution images to exactly 1MB for smoother web performance.

Resize Image to 2MB

Effortlessly compress your large files to 2MB while keeping crystal clear quality.

Resize Image to 3MB

Get your images to a precise 3MB, the ideal size for professional online portfolios.

Resize Image to 4MB

Achieve a 4MB file size instantly for quick sharing and faster upload times.

Resize Image to 5MB

Scale your high-definition photos to exactly 5MB without losing important details.

Resize Image to 6MB

Perfectly shrink large camera shots to 6MB for efficient storage and management.

Resize Image to 7MB

Optimize and trim massive images to 7MB in seconds—optimized for web use.

Resize Image to 8MB

Quickly bring your oversized images down to 8MB for professional compatibility.

Resize Image to 9MB

Professional-grade resizing: reduce your photo files to 9MB without quality loss.

Resize Image to 10MB

Ensure your large files fit perfectly at 10MB with this fast, simple resize tool.

画像リサイザーに関するよくある質問

はい！JPG・PNG・WEBPの画像（最大5MB）を完全無料でリサイズできます。

高度なアルゴリズムで最高品質を維持します。縮小時の細部の損失は最小限に抑えています。

アップロードされた画像はリサイズ後、サーバーから自動的に削除されます。プライバシーを最優先しています。

Not if you do it right. Our tool uses smart resampling, so shrinking a photo down keeps the details sharp instead of turning it blurry or pixelated. If you are going from a huge camera photo down to something small for the web, you honestly would not notice much difference in clarity — you will just notice the smaller file size.

No, nothing at all. It runs right in your browser tab. Open the site, drop in your photo, resize it, and you are done — no app store, no plugin, no software eating up space on your laptop or phone.

It is free, full stop. No hidden paywall after your third resize, no watermark slapped on your image, and no account needed. You can resize as many photos as you want without ever being asked to pay or sign up.

This is the part people usually worry about most, and fair enough. Everything happens locally on your own device — your photo never actually gets sent to a server. So there is nothing sitting on our end to leak, get hacked, or accidentally end up somewhere it should not.

Both, actually. If you know you need something like 1200×630 for a blog header, just type those numbers in. If you just want it "a bit smaller" without doing math, drag the percentage slider instead and watch the size update live.

It would not, as long as you leave the aspect ratio lock turned on. That keeps height and width scaling together automatically, so your photo stays proportional instead of getting squished or stretched out of shape.

Yep, that is actually one of the more common uses. Shopify (and most eCommerce platforms) prefer specific dimensions for product images, and this tool lets you knock out several photos quickly before uploading, so your storefront looks consistent instead of mismatched.

Works fine on mobile. The site is responsive, so whether you are on an iPhone, Android, tablet, or desktop, the layout adjusts and everything still functions the same — upload, resize, download.

Right now this covers single images cleanly, but if you are doing product listings or a batch of social posts, there is a bulk resizer tool built for exactly that so you are not repeating the process 20 times manually.

JPG, JPEG, PNG, and WEBP are all covered. So whether your photo came straight off a phone camera, was exported from Photoshop, or is one of those newer WebP files from a website, you are not going to hit a "format not supported" wall.