Open .psb files free in your browser
Photoshop’s format for very large images, past the size a PSD can hold: posters, panoramas, big prints. Photo in Madosuite opens .psb files, in a browser tab, without Photoshop.

Three steps
Open Madosuite
In your browser. A small Linux machine starts on your device.
Upload the file
In Files, press Upload and pick your .psb file. Then open it with Photo.
Edit and save as
Save it as PSD, TIFF, ORA and download it.
Photo opens .psb and saves .psd. A huge file needs a computer with plenty of memory, because it all runs on your device.
Photo opens
Photo saves
Questions
How do I open a .psb file without Photoshop?
Open Madosuite in your browser, upload the file in Files, and open it with Photo. It is free.
Can I edit it and save it again?
You can edit it, then save it as PSD, TIFF, ORA, PNG. Photo does not write .psb itself.
Is my file uploaded?
No. It goes into the Linux machine that Madosuite runs in your browser, on your device.
Will it look the same?
Photo opens .psb and saves .psd. A huge file needs a computer with plenty of memory, because it all runs on your device.
Is Madosuite free?
Yes. The apps run on your own device, in the browser tab, so there is no server time to pay for. There is no trial period.