Not all large image files are the same problem. A BMP from Windows Paint needs a different conversion strategy than a TIFF from a professional scanner, which in turn is different from a PSD file from Photoshop. The format determines what information is stored, what might be lost in conversion, which tool is appropriate, and whether you should convert at all. This guide gives you the complete format comparison so you can make the right decision for every file type in your library.
The core question is not just "should I convert?" — it is "which format am I starting from, what is the destination, and what happens to my image in the process?" The answers differ significantly depending on whether you are working with a Windows BMP screenshot, a 300 DPI TIFF scan, a RAW camera file, or a professional TIFF from print production. Understanding these differences saves you from destroying valuable files through careless conversion.
The Master Comparison Table: BMP, TIFF, PSD, RAW
| Format | Compression | Color Depth | Transparency | Metadata | Typical Use Case | Avg Size (1920×1080) | Platform Support |
|---|---|---|---|---|---|---|---|
| BMP | None | 1–32 bit | Limited (32-bit only) | Minimal | Windows Paint, legacy apps, clipboard | ~5.9 MB | Windows native |
| TIFF | None / LZW / ZIP | 8–32 bit | Yes (alpha channel) | Rich (EXIF, IPTC, XMP) | Scanners, medical, print production | 4–16 MB | Wide (not all browsers) |
| PSD | RLE / ZIP | 8–32 bit | Yes (layers) | Layers, paths, channels | Photoshop editing files | 20–200 MB | Adobe only |
| RAW (CR2, NEF, ARW) | Lossless proprietary | 12–16 bit | No | Very rich camera metadata | Camera output, photography masters | 15–35 MB | Requires RAW decoder |
| JPEG | Lossy DCT | 8 bit | No | EXIF supported | Web, email, sharing, photography | 300–500 KB | Universal |
| PNG | Lossless deflate | 8–16 bit | Yes (full alpha) | Limited | Web graphics, screenshots, logos | 1–3 MB | Universal |
When to Convert BMP → JPG (Almost Always)
BMP files should be converted to JPEG in almost every non-archival situation. The format offers no advantage for delivery — it is large, has no transparency in common use, and carries no metadata worth preserving. Here is the complete decision framework:
Convert BMP to JPEG when:
- You are emailing or sharing the image with anyone
- You are uploading to a website, CMS, or social media platform
- You are storing screenshots in a cloud folder and storage space matters
- The BMP contains photographic content (photos, complex illustrations)
Convert BMP to PNG instead of JPEG when:
- The BMP is a screenshot of text, UI, code, or diagrams — PNG handles sharp edges without JPEG artifacts
- You need lossless quality but smaller than BMP (PNG is 60–80% smaller than BMP for the same quality)
- The image will be further edited — keep it lossless until the final delivery step
Keep as BMP when:
- A legacy Windows application specifically requires BMP input
- You are working within a Windows icon or resource file workflow
When to Convert TIFF → JPG (Only for Delivery)
TIFF conversion decisions are more nuanced because TIFF files have legitimate archival value. The rule is to always keep the TIFF master and convert copies for delivery:
Convert TIFF to JPEG for sharing:
- Email delivery of scanned documents or photos to clients
- Web galleries showing scanned artwork or photographs
- Online form uploads with file size limits
- Sharing professional photos from camera for non-print use
Never convert TIFF to JPEG if:
- The TIFF is in CMYK mode for print production — JPEG does not support CMYK properly
- The TIFF is a medical or scientific diagnostic image
- The file will be used as a source for further editing
- You are in a legal or compliance context requiring lossless archival
Tool Recommendations by Source Format
BMP → JPG or PNG: Use ConvertiImage
BMP files are the simplest conversion case. Upload to ConvertiImage, choose JPEG (for photos) or PNG (for screenshots with text/UI), set quality, download. No software needed. Works on any device including mobile.
Recommended settings: JPEG 85% for sharing, PNG for screenshots
TIFF → JPG: Use ConvertiImage or GIMP
For standard TIFF files from scanners or cameras, ConvertiImage handles the conversion online with metadata preservation. For TIFF files with embedded color profiles, CMYK mode, or 16-bit depth, GIMP gives you full control over the color space conversion process.
Recommended settings: JPEG 88–92% for documents, 85% for photos
PSD → JPG: Use Photoshop, GIMP, or XnConvert
PSD files contain layers and non-destructive edits. You must flatten the image first before exporting to JPEG. In Photoshop: File → Export → Export As → JPEG. In GIMP: File → Export As → JPEG (GIMP flattens automatically). XnConvert can also batch-convert PSD to JPEG.
Recommended settings: JPEG 90% to preserve design quality
RAW → JPG: Use Lightroom, Capture One, or RawTherapee
RAW files require a dedicated RAW converter — not a general image converter. Use Adobe Lightroom, Capture One, or the free RawTherapee to process RAW files with exposure, color, and sharpness adjustments before exporting to JPEG. Never convert RAW directly without tonal adjustments.
Recommended settings: JPEG 95% for delivered photos
Scenario Verdicts: What Should You Actually Do?
| Scenario | Source Format | Recommended Action | Keep Original? |
|---|---|---|---|
| Windows screenshot for email | BMP | Convert to PNG (if has text) or JPEG 85% (if photographic) | No — BMP not worth keeping |
| Scanned document for sharing | TIFF | Convert copy to JPEG 90%, keep TIFF | Yes — keep TIFF |
| Product photo for e-commerce | TIFF / RAW | Convert to JPEG 85%, resize to 2048px | Yes — keep TIFF/RAW master |
| Print artwork for web preview | TIFF (CMYK) | Convert to RGB JPEG 90% in GIMP/Photoshop | Yes — keep TIFF CMYK |
| Old photo archive cleanup | BMP / TIFF | Keep TIFF as archive, convert BMP to JPEG 85% | TIFF yes, BMP discretionary |
Best BMP to JPG Converter: Convert Legacy Windows Images to JPEG Free (2026) — full tool comparison with quality settings
How to Convert BMP or TIFF to JPG in 3 Steps — step-by-step tutorial for Windows, Mac, and online
