Thumbor has support for image filters. Filters usually apply some post-processing to the images and they can be chained and applied in order.

Thumbor's extensible nature allows you to write your own filters, but it comes with some pre-packaged filters of its own.

• Brightness
• Contrast
• Colorize
• Equalize
• Filling
• Format
• Frame
• Extract-Cover
• Grayscale
• Max Bytes
• Noise
• No Upscale
• Quality
• Red-Eye
• RGB
• Round Corners
• Rotate
• Saturation
• Sharpen
• Strip ICC
• Watermark
• Convolution
• Blur
• Extract Focal Points
• GifV
• Curve