Help Center

Detailed guides and tutorials to help you make the most of CompressFast.

Quick Start

Just 3 steps: ① Drop or select images → ② Click "Compress All" → ③ Download compressed images. That's it!

Different scenarios call for different formats. Choosing correctly yields better compression:

Quality ranges from 0-100. Higher values = better quality & larger files. Recommendations:

Quality	Result	Size Reduction	Use Case
95-100	Near-lossless	~20%	Photography, Print
85-95	Excellent	~50%	Web, Social Media
70-85	Good	~70%	E-commerce, Email
50-70	Acceptable	~85%	Previews, Thumbnails
0-50	Noticeable	~95%	Extreme compression

Batch processing dramatically improves efficiency. Here's how:

Drop multiple images (or click to select). Free: up to 30, Pro: up to 500

Adjust quality, speed, and output format in Settings. All images use the same settings

Optional: configure resize, watermark, and batch rename rules

Click "Compress All" to start. Progress bars show each image's status

After compression, download individually or use "Download All" to get a ZIP

Protect your image copyright with text or image watermarks:

Text watermark: Enter text, choose font size, color, opacity, and 9-grid position (bottom-right, center, top-left, etc.)

Image watermark: Upload a PNG/JPEG logo, also supports position and opacity adjustment

⚠️ Note: Watermarks are rendered directly into the image during compression and cannot be removed. Keep originals backed up.

Combine compression and resizing in one step:

Pixel mode: Enter target width/height. Check "Lock" to auto-calculate the other dimension

Percentage mode: Click 50%/75% to quickly scale down

Preset mode: 1080p for social media, 720p for web previews

Three built-in scene presets for instant setup: