Photoshop Document (.psd)
Adobe StandardPhotoshop Document (PSD) is the ubiquitous native file format of Adobe Photoshop, preserving complex multi-layer raster and vector compositions, masks, typography, and adjustment layers.
Convert PSD to PNG
Free in-browser PSD to PNG converter. Convert files instantly on your device.
Inspect & Metadata
Operating systems and file analyzers identify PSD files by inspecting the leading binary byte sequence:
Byte-Level Header Signature (Magic Bytes)
Operating systems and file analyzers identify PSD files by inspecting the leading binary byte sequence:
HEX SIGNATURE (OFFSET 0):
38 42 50 53 00 01ASCII REPRESENTATION: 8BPS..
Standardization: Adobe Photoshop File Format Specification (Version 1)
Technical Specifications
| Container Architecture | Hierarchical document database containing Header, Color Mode Data, Image Resources, Layer & Mask Information, and Composite Image Data |
| Compression | PackBits (RLE), Deflate (ZIP), or uncompressed planar byte channels |
| Byte Endianness | Big-Endian (Motorola byte order) |
| Color Spaces | sRGB, Adobe RGB, Display P3, ProPhoto RGB, CMYK, Lab Color, Embedded ICC |
| Channels & Structure | Multi-layer composites, adjustment layers, text layers, vector masks, smart objects, and channels |
| Max Dimensions | 30,000 x 30,000 pixels (standard 32-bit limit) |
| Transparency | Full per-layer alpha transparency and blend modes (Multiply, Screen, Overlay, etc.) |
| Streaming & Progressive | Non-streamable; embeds flattened composite image for quick third-party previewing |
Technical Comparison Matrix: PSD vs Competitors
| Technical Attribute | PSD (Current) | PSB | TIFF | PNG |
|---|---|---|---|---|
| Layer Preservation | 100% complete Photoshop layer tree | 100% complete Photoshop layer tree | Limited layer block support | Flattened single-image only |
| Maximum Dimension | 30,000 x 30,000 pixels | 300,000 x 300,000 pixels | Practically unlimited (BigTIFF) | Virtually unlimited |
| Maximum File Size | 2.0 Gigabytes (32-bit offset cap) | Exabytes (64-bit offset cap) | 4.0 GB (standard TIFF) | 2.0 Gigabytes |
| File Structure | Version 1 (38 42 50 53 00 01) | Version 2 (38 42 50 53 00 02) | TIFF IFD directory structure | PNG chunk stream |
Common Corruption Modes & Hex Recovery Guide
Photoshop error: 'An unexpected end-of-file was encountered'.
Root Cause: File transfer was interrupted before the final composite image and layer channels were written.
Recovery: Recover individual undamaged layers or composite preview using File2File PSD Recovery.
Security Analysis & Parser Attack Vectors
PSD parsers must navigate dozens of custom resource blocks and layer channels where malformed length fields can cause buffer overflows.
Known Attack Vectors
- Integer overflow during allocation of layer mask and color channel buffers.
- Buffer over-read when parsing PackBits (RLE) compressed scanline records.
- Out-of-bounds pointer calculation in Photoshop Image Resource Blocks (IRB).
Defensive Best Practices: Process PSD files using memory-safe sandboxed WebAssembly engines.
Historical Origins & Milestones
Key Advantages & Pros
- Industry benchmark for digital design, preserving 100% of non-destructive adjustment layers, layer masks, and smart objects.
- Universal import compatibility across graphic design, video editing (Premiere, After Effects), and 3D modeling tools.
- Embeds a flattened composite image record, allowing non-Adobe image viewers to display the artwork without rendering layers.
Technical Limitations & Cons
- Rigid 30,000-pixel dimension limit and 2 GB file size limit (requires PSB format beyond these thresholds).
- Complex proprietary specification makes perfect third-party layer rendering difficult to achieve outside Adobe software.
- Substantial file sizes compared to flattened export formats like WebP or PNG.
Interesting Technical Trivia
- The first 4 bytes of every PSD file are ASCII '8BPS', which stands for '8-Bit Photoshop'.
- Thomas Knoll originally developed Photoshop on a Macintosh Plus in 1987 under the working title 'Display'.
- When another application opens a PSD without Photoshop's layer engine, it simply displays the flattened composite image stored at the end of the file.
Frequently Asked Technical Questions
Can I open a PSD file without Photoshop?
Yes. You can view, convert, and extract images from PSD files using File2File.app directly in your web browser without installing Adobe software.
How can I convert a PSD to PNG or JPG?
File2File.app allows you to convert PSD files into flattened, web-ready PNG or JPG images in seconds with zero data transmission.
Why is my PSD file over 2 GB refusing to save?
Standard PSD files have a hard 2 GB architectural limit. In Photoshop, choose 'Save As' and select 'Large Document Format (.psb)' to save files larger than 2 GB.