Protect PDF
Encrypt your PDF files with a password.
Drop an image to start
Drop files here or click to browse
Supports JPG, PNG, WebP, AVIF • Up to 50MB
Supports JPG, PNG, WebP, AVIF • Up to 50MB
Secure
Fast
Private
Supported Formats
We support all modern image formats for maximum compatibility.
JPG
Photos & Web
PNG
Transparent
WebP
Modern & Fast
AVIF
High Efficiency
BMP
Raw Bitmap
TIFF
Pro Workflow
High Quality
Advanced algorithms maintain excellent visual quality.
Lightning Fast
Process images in milliseconds directly in your browser.
100% Private
Files are processed locally and never uploaded to any server.
Responsive
Works perfectly on desktop, tablet, and mobile devices.
如何在线调整图片大小
1
Upload Files
Select the PDF files you want to secure.
2
Set Password
Enter a strong password to encrypt your documents.
3
Encrypt
Download your protected files. They can now only be opened with the password.
为什么选择 Image-Resizer.net？
在线调整图片大小最快、最可靠的方法。
Lightning Fast
Process images instantly in your browser.
Secure & Private
Your files never leave your device.
High Quality
Best-in-class algorithms for perfect results.
Free Forever
No hidden costs or watermarks.
常见问题
Yes! Our image tool is 100% free to use with no hidden costs, daily limits, or watermarks.
We currently support JPG, PNG, WebP, AVIF, and TIFF formats for both import and export.
Absolutely. Your images are processed securely via HTTPS and are automatically deleted from our servers immediately after processing.
We use smart algorithms to optimize file size while maintaining excellent visual quality.
Yes, our tool is fully responsive and works perfectly on all devices including iPhones, iPads, and Android phones.
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