Best Tools · 画像

2026年 最高の無料画像編集オンラインツール

Photoshopなしで画像を編集したい?これらの無料オンライン画像エディターは、切り抜き、リサイズ、回転、透かし、フォーマット変換をブラウザ内で処理します。

#1

画像 クロッパー

Cropping images for social media

Crop images to specified dimensions and aspect ratios. Free online image cropper for thumbnails and social media.

✅ Pros
  • Preset aspect ratios
  • Free-form crop
  • No upload needed
⚠️ Cons
  • None significant
Use Free →
#2

画像 リサイザー

Resizing images for web

画像をオンラインで無料リサイズ。ピクセルまたはパーセントでサイズ変更、アスペクト比維持、トリミング対応。JPG、PNG、WebP対応、一括処理可能。

✅ Pros
  • Batch resize
  • Preset sizes
  • Aspect ratio lock
⚠️ Cons
  • None significant
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#3

画像 回転

Rotating images to correct orientation

Rotate images to any angle including 90, 180, and 270 degrees. Free online image rotator for fixing photo orientation.

✅ Pros
  • 90° increments
  • Custom angles
  • Fast
⚠️ Cons
  • None significant
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#4

画像 透かし入れ

Protecting image copyright

Add text or image watermarks to protect your images. Free online tool for branding photos directly in your browser.

✅ Pros
  • Text and logo watermarks
  • Custom position
  • Batch support
⚠️ Cons
  • None significant
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#5

画像 フォーマット コンバーター

Converting between image formats

画像フォーマットをオンラインで無料変換 — JPG、PNG、WebP、AVIF、GIF、SVG、BMP、TIFF、ICOなど多数対応。高品質変換、一括処理、100%ブラウザ内。

✅ Pros
  • 10+ formats
  • Batch convert
  • High quality
⚠️ Cons
  • None significant
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#6

画像 ぼかし

Blurring faces and sensitive content

Apply blur effects to images for privacy or artistic purposes. Free online image blur tool for faces and backgrounds in your browser.

✅ Pros
  • Adjustable intensity
  • Real-time preview
  • Private
⚠️ Cons
  • None significant
Use Free →
#7

画像 Grayscale

Creating black and white images

Convert images to grayscale or black and white instantly. Free online image grayscale converter for photo editing in your browser.

✅ Pros
  • One-click convert
  • Adjustable intensity
  • Fast
⚠️ Cons
  • None significant
Use Free →
#8

画像 投げる

Flipping and mirroring images

Flip images horizontally or vertically in your browser. Free online tool to mirror photos with instant preview and download.

✅ Pros
  • Horizontal and vertical
  • Instant
  • Free
⚠️ Cons
  • None significant
Use Free →
#9

画像 角丸 角

Creating rounded corner images

Add rounded corners to images with adjustable border radius. Preview and download as PNG with transparent background.

✅ Pros
  • Custom radius
  • Preset shapes
  • Preview
⚠️ Cons
  • None significant
Use Free →
#10

画像 メタデータ ビューアー

Viewing image metadata and EXIF

View EXIF metadata from photos including camera, GPS, and exposure info. Free online image metadata viewer for privacy.

✅ Pros
  • EXIF data
  • GPS location
  • Camera info
⚠️ Cons
  • None significant
Use Free →

Frequently Asked Questions

Can I edit images online without Photoshop?

Yes. For common tasks — cropping, resizing, rotating, watermarking, and format conversion — browser tools are faster and free.

Do I need to install anything?

No. Every tool runs in your browser with no downloads, plugins, or accounts required.

Are my edits private?

Yes. Images are processed on your own device and never uploaded to a server.

How to Choose the Best Tool

When choosing a tool, consider your specific needs: file size limits, processing speed, privacy guarantees, and batch processing capabilities. All recommended tools have been tested by our team.