Compress Image to Exact File Size
Need your photo under 50KB, 100KB, 200KB, or 1MB? Resize4U lets you target an exact file size — no guessing, no re-uploading. Works 100% in your browser.
画像をアップロード
JPG, PNG, WebP, PDFに対応
ここに画像をドラッグ＆ドロップするか、クリックして選択
⚡ Quick Resize Presets
How to compress an image to a specific file size
- 1
Upload Your Image
Drag and drop or click to select any JPG, PNG, or WebP file. Your image stays on your device.
- 2
Enter Your Target File Size
In the "Target File Size" box, type the exact size you need (e.g. 50 KB, 200 KB, or 1 MB). Resize4U will automatically adjust quality and dimensions.
- 3
Click "Resize & Compress"
Download the compressed image instantly. No watermarks, no limits, no sign-up required.
Why compress images to a specific size?
Online Forms & Government Portals
Many job applications, exam registrations, and government websites require photos under a specific size (often 50KB–200KB). Resize4U hits that target precisely.
Email Attachments
Large photos can exceed email attachment limits. Compress a batch of travel or event photos to under 1MB each for easy sharing.
Website Performance
Smaller images load faster. Compress blog and product images to boost page speed scores and keep visitors engaged.
Social Media Upload Limits
Some platforms cap image file sizes. Resize4U ensures your images meet the limit without visibly losing quality.
Which format compresses best?
| Format | Best For | Transparency | Compression |
|---|---|---|---|
| JPG / JPEG | Photos, complex images | No | Excellent (lossy) |
| PNG | Logos, graphics, screenshots | Yes | Limited (lossless) |
| WebP | Everything (modern browsers) | Yes | Best (lossy + lossless) |
Tip: Switch to WebP for the smallest file size at the same quality. All modern browsers support it.
Resize4Uが選ばれる理由
100% プライバシー保護
すべての処理がブラウザ内で完結。画像がサーバーに送信されることは一切ありません。
超高速処理
アップロード待ち時間ゼロ。お使いの端末で瞬時に画像処理を行います。
完全無料
会員登録不要、課金なし、制限なし。いつでも気軽にご利用いただけます。
パスポート写真、履歴書、ビザ申請、試験フォーム、SNS投稿に最適
JPG, PNG, WebP, PDF対応 • 寸法指定または目標容量指定で圧縮 • 切り抜きと回転
Frequently Asked Questions
Everything you need to know about resizing and compressing images with Resize4U.
Is my data safe? Do you store my photos?▼
100% safe. Resize4U works entirely in your browser using client-side JavaScript. Your images are never uploaded to any server, stored in any database, or seen by anyone else. You can even use this tool offline without an internet connection.
What is the best format for resizing images?▼
For photos and complex images, JPEG offers the best balance of quality and small file size. For logos, graphics, and images with transparency, use PNG. WebP is the modern standard that gives superior compression for both photos and graphics with full transparency support.
How do I resize an image to a specific file size (e.g., under 50KB)?▼
Upload your image, enter your target file size in the "Target File Size" box (e.g., 50 KB), and click "Resize & Compress". Resize4U will automatically adjust the image quality and dimensions to meet your exact requirement.
What DPI should I use for printing vs web?▼
For web, social media, and screen display, 72 or 96 DPI is standard. For high-quality printing (passport photos, documents, photo prints), use 300 DPI. For standard document printing, 150 DPI is sufficient.
Can I resize photos for official documents like passports and visas?▼
Yes! Use our built-in presets for US Passport (2x2 inches / 51x51mm), EU Passport (35x45mm), Indian Passport, Schengen Visa, and more. All presets automatically apply the correct 300 DPI print standard.
Is there a limit on how many images I can resize?▼
No limits at all. You can resize as many images as you want, anytime, completely free without creating an account or subscribing.