Open Thermal & IR Images Instantly.
Open thermal-camera photos and radiometric infrared files on iPhone, iPad, and Mac. Read the temperature behind every pixel, switch color palettes, and find the hot and cold spots — 100% offline, no account, no uploads.
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Thermal Viewer parses .seq, .fff, radiometric .jpg files entirely on your device. No cloud uploads, no server processing, no telemetry — forensic-grade privacy by design.
See Every Temperature
Read the temperature behind each pixel of a radiometric image, with the min, max, and average at a glance.
Find Hot & Cold Spots
Drop measurement points anywhere and pinpoint the hottest and coldest areas in the scene instantly.
Your Palettes, Your Way
Switch between thermal color palettes — iron, rainbow, grayscale, and more — to read the image the way you need.
Offline & Private
Your thermal images open and are analyzed on your device — nothing is uploaded, no account required.
See it on every device.
About IR files.
What is a thermal or radiometric image?
It's a photo from a thermal/infrared camera that stores a real temperature value for every pixel, not just colors. Thermal Viewer reads those values so you can measure them.
Which thermal files can it open?
Radiometric images and thermal sequence files exported by common infrared cameras, including radiometric JPGs. Open them straight from the Files app, a download, or the share sheet.
Do I need the camera's desktop software?
No. Thermal Viewer opens and analyzes the files on its own — no desktop app, no account, and no cloud service.
Are my images private?
Yes. Everything is read and analyzed on your device; nothing is ever uploaded.
Get Thermal Viewer today.
Open .seq, .fff, radiometric .jpg files in seconds — strictly offline, strictly private.