Reference Formats
PSD
Adobe Photoshop's proprietary, lossless native editing format preserving layers, masks, adjustment layers and text as an editable working master rather than a flattened output.
Extension
.psd
Full name
Photoshop Document
Introduced
February 1990 (with Photoshop 1.0)
Vendor
Adobe Inc.
What is inside the container
PSD stores data losslessly (using RLE or ZIP compression internally for layer/channel data, with no lossy option) across Bitmap, Grayscale, Indexed, RGB, CMYK, Multichannel, Duotone, and Lab color modes, at 1, 8, 16, or (in later versions) 32 bits per channel. It is capped at 30,000 x 30,000 pixels and a 2 GB file size. EXIF, IPTC, XMP, and ICC profiles are all supported for read/write, stored in the PSD's Image Resources block alongside legacy IPTC-NAA records.
How to open it
For archives
A defensible DAM master for design-source assets specifically because it's lossless and preserves full editability (layers, masks, text). Because it's a proprietary format whose implementation can shift across Photoshop versions and whose third-party fidelity (GIMP, Affinity) is imperfect, best practice is to keep the PSD master alongside a flattened, standardized lossless derivative (TIFF) for long-term, cross-tool preservation.
PSD has been Photoshop’s native format since the application’s first release in February 1990, and its entire design premise is different from every other format on this list: it exists to preserve an editable working state — layers, masks, adjustment layers, text, smart objects — not to distribute a finished image. That’s why it’s lossless with no lossy compression option at all; flattening away the layer structure would defeat the format’s purpose.
In a DAM, PSD is a legitimate master format specifically for design-source assets — templates, layered comps, in-progress creative work — where the editability itself is the asset. Because Photoshop stores metadata in the same Image Resources block whether it’s EXIF, IPTC, or XMP, PSD assets can carry the same rich metadata as TIFF, and XMP written by Photoshop is often the backbone of a DAM’s keyword and caption search for creative libraries.
The DAM pitfalls are practical rather than structural. PSDs can be enormous once many layers and smart objects accumulate, so thumbnail and preview generation must flatten the file — and some third-party renderers don’t fully support every Photoshop effect, so a DAM-generated preview can occasionally look subtly different from the file opened in actual Photoshop. Metadata can also drift: XMP written on one resave can conflict with EXIF or IPTC fields from an earlier one, so ingest pipelines typically re-normalize metadata rather than trusting whichever field was written most recently.
Frequently asked
Is PSD a defensible DAM master format?
Yes, specifically for design-source assets — it's lossless and preserves full editability such as layers, masks, and text. Because it's a proprietary format with imperfect third-party fidelity, best practice is to keep the PSD master alongside a flattened TIFF derivative for long-term, cross-tool preservation.
What metadata does PSD support?
EXIF, IPTC, XMP, and ICC profiles are all supported for read/write, stored in the PSD's Image Resources block alongside legacy IPTC-NAA records.
Does GIMP open PSD files with full fidelity?
GIMP's PSD import/export fidelity improved substantially in GIMP 2.10 — up to 32-bit/channel and more blend modes — but it isn't identical to opening the file in native Photoshop.
What are PSD's size limits?
PSD is capped at 30,000 x 30,000 pixels and a 2 GB file size; files that exceed this need the PSB (Large Document Format) variant instead.
Is PSD compression lossy or lossless?
PSD is lossless with no lossy compression option at all — it uses RLE or ZIP internally for layer/channel data, because flattening away the layer structure would defeat the format's purpose as an editable working master.
Why can PSD metadata drift across resaves in a DAM?
XMP written on one resave can conflict with EXIF or IPTC fields from an earlier one, so ingest pipelines typically re-normalize metadata rather than trusting whichever field was written most recently.
What color modes does PSD support?
Bitmap, Grayscale, Indexed, RGB, CMYK, Multichannel, Duotone, and Lab, at 1, 8, 16, or (in later versions) 32 bits per channel.
Why is thumbnail generation tricky for PSD assets in a DAM?
PSDs can be enormous once many layers and smart objects accumulate, so preview generation must flatten the file, and some third-party renderers don't fully support every Photoshop effect — so a DAM-generated preview can look subtly different from the file opened in actual Photoshop.
Sources
- PSD has been Photoshop's native format since Photoshop 1.0's release in February 1990. checked 2026-08-07 — Wikipedia: Adobe Photoshop
- PSD is capped at 30,000 x 30,000 pixels and a 2 GB file size. checked 2026-08-07 — FileInfo.com: PSD file extension
- PSD supports color modes including Bitmap, Grayscale, Indexed, RGB, CMYK, Multichannel, Duotone, and Lab, with metadata stored in the Image Resources block. checked 2026-08-07 — Photoshop (PSD) File Format Summary
- ExifTool supports full read/write of EXIF, IPTC, XMP, and ICC profile data in PSD files. checked 2026-08-07 — ExifTool supported file types
- GIMP 2.10 improved PSD import/export fidelity, including higher bit-depth precision and additional blend modes. checked 2026-08-07 — GIMP 2.10 Release Notes