Why convert SAI to PSB?
PSB is Photoshop's large-document format for canvases that exceed PSD's 30,000-pixel limit. If a high-resolution SAI illustration is too large for a standard .psd, PSB is the correct target. The .sai format is proprietary, so PaintTool SAI is the only tool that can open it and act as the first step.
How to convert SAI to PSB
Paint Tool SAI + Adobe Photoshop APP
Export the .sai file as .psd via File > Export As in PaintTool SAI, then open that .psd in Photoshop and choose File > Save As > Large Document Format (.psb).
Paint Tool SAI APP
Some PaintTool SAI v2 builds list .psb directly under File > Export As - if available in your version, select it to skip the Photoshop step entirely.
Programs that convert SAI
About these formats
.SAI
PaintTool SAI Image
A SAI file is a layered painting document created by PaintTool SAI, a digital art program from SYSTEMAX Software Development. Only PaintTool SAI can open it - no other mainstream app reads…
Open .SAI details →
.PSB
Adobe Photoshop Large Document Format (PSB)
A PSB file is a Photoshop document in the Large Document Format (Photoshop Big) - the same layered format as PSD but built for huge files up to 300,000 x 300,000 pixels and beyond 2 GB.…
Open .PSB details →Quality & what to watch
- SAI's vector/linework layers are rasterized to pixels during the PSD export step and cannot be preserved as editable vectors in the final
.psb. - PSB is only necessary when any canvas dimension exceeds 30,000 pixels; for standard-sized artwork,
.psdis sufficient. - Keep the original
.saifile - once exported, SAI-specific layer types such as linework and pen pressure data cannot be recovered from the PSB.
Frequently asked questions
Do I need Adobe Photoshop to create a PSB file from SAI?
.psd from SAI first, then save as .psb in Photoshop. Some SAI v2 builds can export .psb directly.
