The classic blueprint look
Cyanotype was the first practical photographic process, producing white-on-blue prints. This reproduces that unmistakable Prussian-blue aesthetic from any photo.
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Cyanotype Image Effect
Turn a photo into a deep Prussian-blue cyanotype print with pale highlights.
- Upload
- Single file · 25 MB max
- Privacy
- Nothing is uploaded
- Cost
- Free · no sign-up · no watermark
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Processed entirely on your device
Your file is read, transformed and re-encoded inside this browser tab using JavaScript. There is no upload endpoint — nothing leaves your machine, nothing is stored, and the result is created as a local object URL that disappears when you close the page.
Overview
About the Cyanotype Image Effect
Create a cyanotype effect free online — render any photo as a Prussian-blue blueprint with white highlights, like the classic sun-print process. In your browser with CollabsTool.
The first blueprint process
Cyanotype, invented in 1842, was the earliest practical photographic printing method. Iron salts turn a deep Prussian blue where UV light hits them, leaving the washed-out highlights pale. Engineers adopted it for blueprints, and its cool monochrome has stayed iconic ever since.
How this tool recreates it
We map each pixel's luminance onto a ramp from deep Prussian blue in the shadows to near-white in the highlights. Bright areas of your photo wash out pale while darks sink into rich blue, giving the characteristic blueprint aesthetic from any ordinary image.
On-device and private
The tone mapping runs per pixel on an in-browser canvas and the result is exported as a lossless PNG at full resolution, so your photo never leaves your device.
Subjects the process loved
Cyanotype was built for flat, high-contrast subjects: botanical specimens, lace, architectural line drawings and coastal silhouettes. Because the mapping keys purely on luminance, any photo with crisp light-dark separation — a fence against a bright sky, a leaf held to a window — prints like a genuine 1842 contact sheet.
Making it feel printed
Real cyanotypes are slightly uneven and faintly grainy. Push authenticity with a light Grain pass and a corner-darkening Vignette, then convert the final file with the PNG to WebP Converter so the deep blues survive web delivery without the weight of a raw PNG.
Step by step
How to use the Cyanotype Image Effect
Drop a photo onto the upload area — high-contrast subjects read best.
Watch the image rebuild as a Prussian-blue print with pale highlights.
Bright, simple shapes give the clearest blueprint-style result.
Download the cyanotype PNG at full original resolution.
Why use it
Benefits and common use cases
What this tool is good for, and what it deliberately does not try to do.
Great for line art and architecture
High-contrast subjects — buildings, diagrams, silhouettes and botanicals — translate into crisp, striking blue prints.
Local and instant
The tone mapping runs per pixel on an in-browser canvas and exports a lossless PNG, so nothing is uploaded and no copy is stored.
Questions
Frequently asked questions
Short, honest answers about quality, limits and privacy.
What is a cyanotype?
A cyanotype is an early photographic print made with iron salts that turn Prussian blue under UV light. The result is a blue image with white highlights, historically used for architectural blueprints.
Which photos work best?
High-contrast images with clear shapes: architecture, line drawings, silhouettes, plants and portraits against plain backgrounds. Flat, low-contrast photos look muddy.
Is my photo uploaded?
No. Every pixel is processed on an in-browser canvas and the result stays on your device; nothing is sent to a server.