Image File Size Estimator
Pick the dimensions, format, and quality. The tool returns approximate uncompressed RAM use and compressed file size on disk — useful for knowing whether a 100-megapixel image will fit in Photoshop 7.0's 2 GB memory ceiling.
What the numbers mean
- Uncompressed (RAM) — the in-memory size Photoshop 7.0 needs to hold the image. If this exceeds 2 GB (the 32-bit address limit), Photoshop will swap to scratch disk heavily and slow down. Reduce image size or bit depth.
- PSD — disk size when saved as a layered Photoshop document. Each layer roughly doubles or triples the file because Photoshop stores merged previews plus individual layer data.
- TIFF (uncompressed) — close to the in-RAM size, slightly larger due to TIFF header overhead.
- PNG — lossless compressed format. Compression ratio depends on image content; the estimate assumes typical photographic content.
- JPEG — lossy compressed. The quality slider drastically affects size. JPEG Quality 10 produces visually identical-to-source for almost all photographs.
- BMP — uncompressed bitmap. Largest practical disk format. Usually only used for legacy Windows compatibility.
Photoshop 7.0's 2 GB RAM Ceiling
Photoshop 7.0 is 32-bit and can only address 2 GB of RAM regardless of how much your system has installed. The uncompressed size shown above is the figure that matters — if it is above 2 GB, Photoshop 7.0 will struggle. See our memory limits explanation for the full breakdown.
Common Reference Sizes
| Use case | Dimensions | RAM (8-bit RGB) | JPEG at Q10 |
|---|---|---|---|
| HD wallpaper | 1920 × 1080 | ~24 MB | ~600 KB |
| 4K wallpaper | 3840 × 2160 | ~95 MB | ~2.5 MB |
| 12 MP smartphone JPEG | 4000 × 3000 | ~138 MB | ~3.5 MB |
| 24 MP DSLR | 6000 × 4000 | ~275 MB | ~7 MB |
| A4 at 300 dpi print | 2480 × 3508 | ~100 MB | ~3 MB |
| A3 at 300 dpi print | 3508 × 4961 | ~200 MB | ~6 MB |
| Large panorama | 15000 × 5000 | ~860 MB | ~25 MB |