User Guide for Online Image Compressor
This is a secure and efficient online image compression tool for bulk processing PNG, JPG and WebP. All image processing runs locally inside your browser. Files will not be sent to remote servers to fully protect your privacy.
Core Features
- Bulk Compression: Upload up to 12 images and process them in one click
- Multi-format support: Compatible with JPEG, PNG and WebP
- Local computation: Powered by WebAssembly, all calculations run in browser
- Adjustable quality: Use slider to balance visual quality and file size
- Privacy protection: Clear EXIF metadata in one click to erase camera parameters and GPS location data
- Live preview: Preview compression result before downloading
- Flexible export: Download single file or export all images as ZIP archive
- Forever free: No registration required, unlimited usage
Quick Start
Step 1: Upload Images
Click the upload area or drag images anywhere on the page. A translucent overlay will appear during dragging. Release mouse to finish upload.
Step 2: Adjust Compression Parameters
Two core parameters available in settings panel:
- Compression quality: Range 1%–100%, 85% recommended for daily use
- Clear EXIF metadata: Automatically remove device model and location data when enabled
Step 3: Launch Compression
Click【Start Compression】. The tool processes images sequentially. Each card displays status: Waiting for compression, Compressing, Completed, or Failed.
Step 4: Preview & Single Download
After compression, each card provides two operations:
- Preview: Open full-size view, display compressed size and compression ratio
- Download: Save individual image
Step 5: Bulk ZIP Download
Click【Download All as ZIP】on the right, all compressed images will be packed into v2x1_images.zip for saving.
Recommended Settings for Different Scenarios
- Web graphics: Quality 80%, clear EXIF, keep original format
- Social media sharing: Quality 85%, clear EXIF, prefer WebP
- Email attachments: Quality 70%, clear EXIF, prefer JPEG
- Photography & design drafts: Quality 95%, keep EXIF as needed
Parameter Explanation
Compression Quality Control compression strength:
- 90%–100%: Excellent quality, suitable for high-quality demand scenarios
- 75%–90%: Balanced quality & size, daily general choice
- 50%–75%: Smaller file size, ideal for fast transmission and limited storage
Clear EXIF EXIF includes camera device, capture time, GPS location and more. Enable to remove automatically for privacy protection. Disable if you want to retain original data for photography showcase.
FAQ
Which formats are supported?
JPEG, PNG, WebP. BMP, GIF, SVG are unsupported. Incompatible files will be filtered and prompted during upload.
How many images can I upload at once?
Maximum 12 per batch. Upload area will hide after reaching limit.
What if compressed file becomes larger than original?
Some pre-compressed images cannot be shrunk further. The tool automatically keeps original file to avoid size increase.
How to fix compression failures?
Common causes: corrupted files, unsupported format, insufficient browser memory. Reduce batch size and check file integrity.
Do I need to re-compress after changing parameters?
Yes. After adjusting quality or EXIF options, processed images reset to waiting state. Click【Start Compression】to apply new settings.
Will images be uploaded to third-party servers?
No. All computation runs locally via WebAssembly. Image data never leaves your device.
Browser Compatibility
Built on modern web technologies, minimum supported versions:
- Chrome 80+
- Firefox 78+
- Edge 80+
- Safari 15+ Please upgrade outdated browsers before use.