Image Processor — Batch Resize, Convert, Compress & Watermark

Batch image processing in the cloud. Resize, convert to WebP/AVIF, compress, add watermarks, generate thumbnails, crop, rotate, and strip EXIF metadata. Powered by sharp. No ImageMagick installation required..

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Why this exists

sharp is the most popular image processing library in Node.js (8M+ weekly downloads), but no general-purpose batch image processor exists on Apify. E-commerce sites need bulk WebP conversion for SEO (faster pages = better rankings). Agencies need batch watermarking and thumbnail generation.

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Quick start

Convert an image to WebP:

{
    "images": [
        {
            "url": "https://via.placeholder.com/800x600.png",
            "operation": "convert",
            "format": "webp",
            "quality": 85
        }
    ]
}

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Supported operations

Operation	Description	Required fields
resize	Resize to dimensions	width and/or height, optional fit
crop	Extract region	x, y, width, height
rotate	Rotate by degrees	degrees
flip	Mirror image	axis (horizontal/vertical)
convert	Change format	format (webp/avif/png/jpeg/gif/tiff)
compress	Reduce file size	quality (1-100), optional format
watermark	Add text or image overlay	watermarkText or watermarkUrl, optional watermarkPosition, watermarkOpacity, watermarkScale
thumbnail	Generate small preview	width, height (default 150x150)
strip-exif	Remove metadata	(no extra fields)
get-exif	Read metadata	(no extra fields, returns JSON)

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Input

Each item in the images array:

Field	Type	Required	Description
url	string	Yes	Source image URL
operation	enum	Yes	One of the operations above
format	string	No	Target format: webp, avif, png, jpeg, gif, tiff
quality	number	No	1-100. Default: 80 (60 for AVIF)
width	number	No	For resize/crop/thumbnail
height	number	No	For resize/crop/thumbnail
fit	enum	No	cover, contain, fill, inside, outside
x, y	number	No	For crop (top-left corner)
degrees	number	No	For rotate
axis	enum	No	horizontal or vertical (for flip)
watermarkText	string	No	Text to overlay (for watermark)
watermarkUrl	string	No	URL to an image to overlay as watermark
watermarkPosition	enum	No	top-left, top-right, bottom-left, bottom-right, center
watermarkOpacity	number	No	0-1. Default: 0.5
watermarkScale	number	No	Watermark size as fraction of base image width. Default: 0.2

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Output

Processed images are stored in the Apify Key-Value Store. Each operation also produces a dataset entry:

{
    "sourceUrl": "https://via.placeholder.com/800x600.png",
    "operation": "convert",
    "outputKey": "800x600-convert.webp",
    "outputFormat": "webp",
    "originalSize": 12845,
    "outputSize": 4230,
    "compressionRatio": 67.1,
    "width": 800,
    "height": 600,
    "status": "success",
    "error": null
}

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Pricing

$0.003 per image processed (pay-per-event pricing).

• One operation = one charge (resize + convert = 2 operations = 2 images).
• Errors and dry runs are never charged.
• 100 images = $0.30

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Performance

• Powered by sharp (libvips) — processes images in milliseconds
• WebP conversion typically saves 40-70% file size vs JPEG
• AVIF saves even more but encodes slower — good for archival, not real-time
• Memory: ~256MB sufficient for images up to 10,000x10,000 pixels

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Limitations

• No AI-based background removal. Watermarks support both text and image overlays with configurable position, opacity, and scale.
• Max image size: ~100MB input. Very large images may exceed memory on the default 256MB plan.
• SVG input: Rasterized on read. Output is always raster (PNG, JPEG, WebP, etc).
• Animated GIF: Only the first frame is processed.

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Run on Apify

No setup needed. Click above to run in the cloud. $0.003 per operation.