Data Processing

Data processing provides rich file processing capabilities, allowing cloud-based processing without downloading files.

Image Processing

Perform operations such as cropping, scaling, watermarking, and format conversion on images to optimize user experience and save bandwidth costs.

After activation:

✅ Basic Image Processing: Enabled by default, can be used directly
⚙️ Smart Image Compression: Requires manual activation
⚙️ Advanced Image Compression: Requires manual activation

Feature	Description
Basic Image Processing	Supports cropping, scaling, rotation, format conversion, quality adjustment, Gaussian blur, sharpening, and other operations
Smart Image Compression	Supports automatic compression when accessing images without parameters, or active compression through processing parameter imageSlim. Supports JPG, static PNG, GIF formats. Compression does not change image format
Advanced Image Compression	Converts images to AVIF, HEIF, TPG, ASTC compression formats through processing parameter imageMogr2/format. Also supports SVG image compression

Document Processing

Convert documents to HTML or images to enable online preview functionality.

📌 Feature Support

CloudBase Cloud Storage currently supports the following document processing features:

✅ Document to HTML: Supports converting Word, Excel, PPT, PDF, and other formats to HTML for online preview
✅ Document to Image: Supports converting documents to image formats (PNG, JPG)

Not currently supported: Video and audio multimedia processing features.

Feature	Description	Supported Formats
Document to HTML	Convert documents to HTML for online preview	Word, Excel, PPT, PDF, etc.
Document to Image	Convert documents to image format	Word, Excel, PPT, PDF, etc.

Use Cases:

Online Document Viewing: Preview documents in browser without downloading
Document Content Display: Display document content as images or HTML in applications
Knowledge Base Systems: Document content search and display

Operation Steps

Basic Image Processing

📌 Feature Description

Basic image processing supports real-time image processing through URL parameters without pre-configuration. Enabled by default.

You can access CloudDev Platform - Cloud Storage page, click "Go to COS Bucket", and find "Basic Image Processing" module in the left menu "Data Processing" → "Image Processing".

1. Process Using URL Parameters

Simply add processing parameters after the image access URL:

https://your-bucket.cos.ap-region.myqcloud.com/image.jpg?imageMogr2/thumbnail/!50p

💡 Get Image URL

To get temporary access links for images in cloud storage, please refer to Get Temporary Link.

2. Common Processing Parameters

Operation	Parameter Example	Description
Proportional Scaling	`imageMogr2/thumbnail/500x`	Specify width as 500px, height scales proportionally
Force Scaling	`imageMogr2/thumbnail/!300x200`	Force scale to 300x200 pixels (ignore aspect ratio)
Scale by Percentage	`imageMogr2/thumbnail/!50p`	Scale to 50% of original
Regular Cropping	`imageMogr2/crop/300x300x10x10`	Crop 300x300 pixel area starting from coordinates (10,10)
Smart Cropping	`imageMogr2/crop/300x300/gravity/face`	Smart crop 300x300 pixels based on face position
Rotation	`imageMogr2/rotate/90`	Rotate 90 degrees clockwise
Format Conversion	`imageMogr2/format/webp`	Convert to WebP format
Quality Adjustment	`imageMogr2/quality/85`	Adjust image quality to 85 (range 1-100)
Gaussian Blur	`imageMogr2/blur/3x5`	Gaussian blur with radius 3 and standard deviation 5
Sharpening	`imageMogr2/sharpen/3`	Sharpen with radius 3

3. Create Image Style (Optional)

If you need to reuse the same processing rules, you can create image styles:

Access CloudDev Platform - Cloud Storage page and click "Go to COS Bucket"
In the left menu "Data Processing" → "Image Processing", click "Style Management" → "Add Style"
Configure processing parameters and name the style (e.g., thumbnail)
Use style: image.jpg?imageView2/style/thumbnail

4. Advanced Processing Examples

# Scale + Format Conversion + Quality Adjustment (combined use)
https://example.com/image.jpg?imageMogr2/thumbnail/!50p/format/webp/quality/80

# Crop + Rotate
https://example.com/image.jpg?imageMogr2/crop/300x300/rotate/90

# Add Text Watermark
https://example.com/image.jpg?watermark/2/text/Q2xvdWRCYXNl/font/SGVsdmV0aWNh/fontsize/30/fill/IzAwMDAwMA==/dissolve/80/gravity/southeast/dx/10/dy/10

Smart Image Compression

Smart image compression can significantly reduce image size while maintaining visual quality. Supports JPG, static PNG, GIF formats. Compression does not change image format.

1. Activate Smart Compression

Access CloudDev Platform - Cloud Storage page and click "Go to COS Bucket"
Find "Smart Image Compression" module in the left menu "Data Processing" → "Image Processing"
Click "Activate Service" and confirm activation (billed by number of calls)

2. Use Smart Compression

Two methods available:

Method 1: Auto Compression (Recommended)

No additional parameters needed. Images in JPG, PNG, GIF formats will be automatically compressed when accessed normally:

# Direct access to image, auto compression
https://your-bucket.cos.ap-region.myqcloud.com/image.jpg

Method 2: API Compression

When accessing an image, add the smart compression parameter imageSlim after the image link to access the compressed image:

# Use imageSlim parameter for active compression
https://your-bucket.cos.ap-region.myqcloud.com/image.jpg?imageSlim

📖 Reference Documentation

For more detailed parameter descriptions, please refer to Smart Image Compression Interface Description.

3. Compression Effect Comparison

Smart compression can significantly reduce file size without changing image format:

Format	Before Compression	After Compression	Compression Rate	Visual Quality
JPG	500 KB	250 KB	50%	No noticeable difference
PNG	800 KB	400 KB	50%	No noticeable difference
GIF	1 MB	500 KB	50%	No noticeable difference

Advanced Image Compression

Advanced image compression converts images to high compression rate formats like AVIF, HEIF, TPG, ASTC through the imageMogr2/format parameter. Also supports SVG image compression.

1. Enable Advanced Compression

Access CloudDev Platform - Cloud Storage page and click "Go to COS Bucket"
Find "Advanced Image Compression" option in the left menu "Data Processing" → "Image Processing"
Click "Activate Service" and confirm activation (billed by number of calls)

2. Supported Compression Formats

Format	Parameter	Compression Rate	Compatibility
HEIF	`imageMogr2/format/heif`	More than 80% smaller than JPG	iOS 11+, Android P+ native support
AVIF	`imageMogr2/format/avif`	Next-generation format, highest compression rate	Chrome 85+, Firefox 93+
TPG	`imageMogr2/format/tpg`	Tencent's proprietary format, extremely high compression rate	Requires client SDK support
ASTC	`imageMogr2/format/astc`	Suitable for texture compression	OpenGL ES 3.0+

3. Usage Methods

Method 1: Process on Download (Not Saved)

Add processing parameters after image access URL:

# Convert to HEIF format
https://your-bucket.cos.ap-region.myqcloud.com/image.jpg?imageMogr2/format/heif

# Convert to AVIF format
https://your-bucket.cos.ap-region.myqcloud.com/image.jpg?imageMogr2/format/avif

# Convert to TPG format
https://your-bucket.cos.ap-region.myqcloud.com/image.jpg?imageMogr2/format/tpg

Method 2: Process on Upload (Save Result)

Process and save during image upload:

// Add Pic-Operations in request header
{
  "is_pic_info": 1,
  "rules": [{
    "fileid": "compressed-image.heif",
    "rule": "imageMogr2/format/heif"
  }]
}

Method 3: Cloud Data Processing (Process Existing Images)

Process and save existing stored images:

POST /<ObjectKey>?image_process HTTP/1.1
# Request body same as upload processing

📖 Reference Documentation

4. Compression Effect Comparison

Format	File Size	Compression Rate	Use Case
Original (PNG)	1335.2 KB	-	Original image
HEIF	52.87 KB	96.0%	iOS/Android mobile
AVIF	~50 KB	96.3%	Modern browsers
TPG	~55 KB	95.9%	Tencent ecosystem apps

Document to HTML

Convert documents to HTML format for online preview functionality.

1. Activate Document Preview Service

Access CloudDev Platform - Cloud Storage page and click "Go to COS Bucket"
Click "Activate Service" in the left menu "Data Processing" → "Document Processing"
Confirm activation of document preview feature

2. Use Document to HTML

Preview documents directly through URL parameters:

https://your-bucket.cos.ap-region.myqcloud.com/document.pdf?ci-process=doc-preview&dstType=html

Core Parameters:

Parameter	Required	Description	Value
`ci-process`	Yes	Specify Cloud Infinite processing capability	Fixed as `doc-preview`
`dstType`	Yes	Output target file type	Fixed as `html` (lowercase)
`srcType`	No	Input source file type	If not filled, auto-detect based on file extension (e.g., `pptx`, `pdf`, `docx`)
`sign`	No	Object download signature	Required for private read files, needs URLencode
`copyable`	No	Whether to allow content copying	`1`=copyable (default), `0`=not copyable
`htmlParams`	No	Custom configuration parameters (JSON)	Requires URL-safe Base64 encoding
`htmlwaterword`	No	Watermark text content	Requires URL-safe Base64 encoding
`htmlfillstyle`	No	Watermark color and transparency	RGBA format (e.g., `rgba(192,192,192,0.6)`), requires Base64 encoding
`htmlfront`	No	Watermark text style	e.g., `bold 20px Serif`, requires Base64 encoding
`htmlrotate`	No	Watermark rotation angle	0-360, default 315
`htmlhorizontal`	No	Watermark horizontal spacing	Unit px, default 50
`htmlvertical`	No	Watermark vertical spacing	Unit px, default 100

Usage Examples:

# Basic preview
https://your-bucket.cos.ap-region.myqcloud.com/test.pptx?ci-process=doc-preview&dstType=html

# Disable copying + Add watermark (Base64 encoding of "test" is dGVzdAog)
https://your-bucket.cos.ap-region.myqcloud.com/test.pptx?ci-process=doc-preview&dstType=html&copyable=0&htmlwaterword=dGVzdAog

# Switch to English interface (htmlParams requires Base64 encoding)
https://your-bucket.cos.ap-region.myqcloud.com/test.pptx?ci-process=doc-preview&dstType=html&htmlParams=eyJjb21tb25PcHRpb25zIjp7Imxhbmd1YWdlIjoiZW4ifX0

htmlParams Configuration Example:

// Hide header, switch language to English
{
  "mode": "normal",
  "commonOptions": {
    "isShowHeader": false,
    "language": "en"
  }
}
// Use as htmlParams parameter value after encoding

📖 Reference Documentation

For detailed usage instructions, please refer to Document to HTML Usage Guide.

3. Supported Document Formats

Presentation Files: pptx, ppt, pot, potx, pps, ppsx, dps, dpt, pptm, potm, ppsm
Text Files: doc, dot, wps, wpt, docx, dotx, docm, dotm
Spreadsheet Files: xls, xlt, et, ett, xlsx, xltx, xlsb, xlsm, xltm, ets
Other Formats: pdf, txt, log, xml, htm, html, code files, etc.

4. Notes

File Size Limit: Input file size must be within 200MB
Page Limit: Input file page count limited to 5000 pages
Encoding Requirement: String parameters like htmlParams, htmlwaterword must be URL-safe Base64 encoded
Permission Requirement: Private read files must pass sign parameter for authentication

Document to Image

Convert each page of a document to image format.

1. Convert Using URL Parameters

Convert documents to images in real-time through URL parameters:

https://your-bucket.cos.ap-region.myqcloud.com/document.pdf?ci-process=doc-preview&page=1&dstType=png

Core Parameters:

Parameter	Description	Value
`ci-process`	Required, specify Cloud Infinite processing capability	Fixed as `doc-preview`
`page`	Optional, document page number to convert	Integer, starts from 1, default converts page 1
`dstType`	Optional, output image format	`png` or `jpg`, default is `jpg`
`srcType`	Optional, source file extension type	Specify when file has no extension (e.g., `pptx`, `pdf`, `docx`)
`scale`	Optional, preview image scale ratio	10-200, default 100 (i.e., 100%)
`quality`	Optional, generated image quality	1-100, default 100
`imageDpi`	Optional, render image at specified DPI	96-600, default 96 (Note: high DPI increases processing time)

Usage Examples:

# Basic conversion: convert page 1 to PNG
https://your-bucket.cos.ap-region.myqcloud.com/document.pdf?ci-process=doc-preview&page=1&dstType=png

# Specify quality and scale: convert to JPG, quality 85, scale 50%
https://your-bucket.cos.ap-region.myqcloud.com/document.pdf?ci-process=doc-preview&page=1&dstType=jpg&quality=85&scale=50

# Combine with image processing: add watermark after conversion (requires URL encoding)
https://your-bucket.cos.ap-region.myqcloud.com/test.pptx?ci-process=doc-preview&page=1&ImageParams=imageMogr2/thumbnail/!50p|watermark/2/text/dGVzdA/fontsize/30

📖 Reference Documentation

Document to Image Usage Guide
Supports combining with Image Processing features (such as scaling, watermarking, cropping, etc.) through ImageParams parameter

2. Supported Document Formats

Microsoft Office: Word (.doc/.docx), Excel (.xls/.xlsx), PowerPoint (.ppt/.pptx)
PDF Documents (.pdf)

3. Notes

Timeout Limit: Synchronous interface defaults to 10-second conversion timeout, suitable for documents within a hundred pages or previewing a few pages
File Limit: Input file size limited to 200MB, page count limited to 5000 pages
Private Read Buckets: URL needs to carry COS authorization signature

FAQ

Q: Will image processing modify the original image?

A: No. Image processing is real-time and does not modify the original file. Processed images are dynamically generated on access.

Q: How to save processed images?

A: Two methods:

Persistent Processing: Add |saveas parameter in processing parameters to save processing result as new file
Download and Upload: Download processed image locally, then upload to bucket

Q: Will processed images be cached?

A: Yes. Processed images will be cached at CDN nodes. Subsequent access to the same URL returns cached results without repeated processing.

Q: Does document preview support encrypted documents?

A: Currently does not support encrypted document preview. Documents need to be decrypted before uploading to bucket for preview.

Q: How to batch process images?

A: Can use the following methods:

Workflow: Create workflow in console to automatically process newly uploaded files
Batch Processing Task: Create batch processing task in console to process existing files
SDK: Traverse file list through code and call processing API

Data Processing

Image Processing​

Document Processing​

Operation Steps​

Basic Image Processing​

Smart Image Compression​

Advanced Image Compression​

Document to HTML​

Document to Image​

FAQ​

Q: Will image processing modify the original image?​

Q: How to save processed images?​

Q: Will processed images be cached?​

Q: Does document preview support encrypted documents?​

Q: How to batch process images?​

Related Resources​

Image Processing

Document Processing

Operation Steps

Basic Image Processing

Smart Image Compression

Advanced Image Compression

Document to HTML

Document to Image

FAQ

Q: Will image processing modify the original image?

Q: How to save processed images?

Q: Will processed images be cached?

Q: Does document preview support encrypted documents?

Q: How to batch process images?

Related Resources