The thermal-camera look
Brightness is remapped onto the familiar iron palette — black, purple, red, orange, yellow, white — mimicking how a heat camera renders a scene.
ImageRuns in your browser
Thermal Image Effect
Render a photo as a false-colour thermal heat map from black-hot to white-hot.
- 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 Thermal Image Effect
Create a thermal camera effect free online — map any photo onto a false-colour heat palette from cold black through red and orange to white-hot. In your browser with CollabsTool.
Reading heat as colour
Thermal cameras do not see light — they see heat, and paint it with false colour so we can read it. The familiar iron palette runs from black (cold) through purple, red and orange to white (hot), letting a single glance reveal what is warm and what is cool.
How this tool recreates it
We take each pixel's brightness and look it up on that same iron gradient. Bright, warm-looking areas climb toward yellow and white while dark regions fall to black and purple, so an ordinary photo is re-rendered as if seen through a heat sensor.
On-device and private
The palette 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.
Step by step
How to use the Thermal Image Effect
Drop a photo onto the upload area — subjects with bright, warm areas read best.
Watch brightness map onto the iron heat palette from black to white-hot.
Portraits and night scenes give the classic thermal-camera look.
Download the thermal 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.
Striking sci-fi and art edits
Thermal false colour turns ordinary photos into dramatic, futuristic images perfect for posters, game art and social edits.
Local and instant
The palette mapping runs per pixel on an in-browser canvas and exports a lossless PNG, so nothing is uploaded.
Questions
Frequently asked questions
Short, honest answers about quality, limits and privacy.
Is this a real thermal image?
No. Real thermal cameras detect infrared heat. This simulates the look by mapping the visible brightness of an ordinary photo onto a heat-style colour palette.
Which photos look best?
Images with a clear subject against a cooler background — portraits, people, animals and night scenes — read most like a genuine heat signature.
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.