X3F to TIFF Converter

How to Convert X3F to TIFF Online

1. Upload Your X3F File: Drag and drop or click "+ Add Files" to load .x3f RAW files from a Sigma DP Merrill, sd Quattro, SD1 Merrill, or any other Foveon X3 camera. Batch upload is supported — convert an entire shoot in one pass. Files stay in your browser session; nothing is sent to a third party.
2. Pick a Quality Preset: Default is Very High (Recommended), which demosaics the three Foveon layers at full resolution with minimal denoise. Drop to High or Medium for faster batch turnaround when output will be downsized for web. Very Low is only useful for proofing.
3. Choose Compression Type and File Extension (Optional): Set Compression Type to LZW or ZIP/Deflate for lossless archival, JPEG (the page default) for ~70% smaller TIFFs at editing-grade quality, PackBits for legacy print workflows, or None for maximum compatibility with older imaging pipelines. Pick File extension TIFF (.tiff) or TIF (.tif) — the bytes are identical, only the suffix differs. Resize with Resolution Percentage, Preset Resolutions, or explicit Width x Height if you don't need the full Foveon resolution.
4. Convert and Download: Click "Convert". Each output is delivered as an Adobe/Aldus TIFF you can open directly in Photoshop, Lightroom, Affinity Photo, Capture One, GIMP, or any DAM that ingests TIFFs. No watermarks, no sign-up, no Pro tier.

Why Convert X3F to TIFF?

X3F is the proprietary RAW container Sigma writes from every Foveon X3 sensor camera — SD9 (2002) through the SD1 Merrill, DP1/DP2/DP3 Merrill, dp Quattro, and sd Quattro/sd Quattro H. The Foveon sensor stacks red, green, and blue photodiodes vertically at each pixel site (exploiting silicon's wavelength-dependent absorption depth), so X3F files contain three full color layers instead of a Bayer mosaic that has to be demosaiced. The trade-off: only Sigma Photo Pro (SPP), the Sigma X3F Plug-in for Photoshop, and a handful of third-party tools (Iridient, Capture One via DNG, X3Fuse) can actually read X3F natively. Converting to a 16-bit TIFF bakes the demosaicked Foveon image into a format every professional photo tool on the planet understands.

• Edit in Lightroom, Capture One, or Affinity Photo — None of these read X3F directly. A 16-bit TIFF preserves the demosaiced Foveon color data and slots straight into a non-destructive catalog as the master file.
• Skip Sigma Photo Pro entirely — SPP is notoriously slow on Merrill and Quattro files (the dp2 Merrill's 46 MP three-layer raws can take 30+ seconds per export on a mid-range laptop). A pre-converted TIFF library means you only pay the demosaic cost once.
• Archive Foveon files in a portable format — Sigma discontinued the DP0/DP1/DP2/DP3 Quattro line in 2022 and has not shipped a new Foveon camera since. TIFF (Adobe/Aldus 1986, public spec) will outlive both SPP and any future Sigma RAW pipeline.
• High-resolution print and reproduction — A 16-bit TIFF at full Foveon resolution holds enough color depth for fine-art giclée prints, museum reproduction, and CMYK pre-press (TIFF supports CMYK and ICC profiles natively; JPEG does not handle 16-bit at all).
• Multi-page document workflows — TIFF supports multiple images in a single file (each in its own Image File Directory), useful for assembling a Foveon-shot scan series, focus stack, or bracketed sequence into one container.
• Compositing source for Photoshop — Layered or multi-pass edits, focus stacks, and panorama stitches all want a 16-bit-per-channel master. A TIFF demosaicked once and re-used preserves the Foveon color signature across every comp.

Need a different output? See X3F to JPG for compressed web delivery, X3F to PNG for lossless 8-bit/16-bit RGBA, or X3F to TIF for the .tif extension. Converting other camera RAWs? Try DNG to TIFF, CR2 to TIFF, ARW to TIFF, or NEF to TIFF. Bring TIFFs back down to size with Compress TIFF or repackage to TIFF to PDF.

X3F vs TIFF — Format Comparison

TIFF Compression Type — Which to Pick

For Foveon TIFF masters, pick ZIP/Deflate when you want lossless archival, JPEG when you want a smaller editing copy, and None only if the downstream tool can't parse compressed TIFF.

Frequently Asked Questions

Will I lose Foveon color data converting X3F to TIFF?

Not if you use 16-bit TIFF with lossless compression (None, LZW, or ZIP). The demosaic step itself bakes in whatever rendering choices the converter makes (white balance, X3 Fill Light, color profile), but the resulting 16-bit per-channel TIFF preserves the full tonal range the Foveon sensor recorded. The lossy bit comes from JPEG compression inside the TIFF wrapper — avoid that for masters. Sigma Photo Pro's own export and the Sigma X3F Plug-in for Photoshop both default to 16-bit TIFF for this reason.

Why not just convert X3F to DNG instead?

DNG (Adobe's Digital Negative) keeps the file in a RAW state, so you can keep tweaking white balance, exposure, and tone in Lightroom or Capture One non-destructively. TIFF bakes those decisions into pixels. Convert to DNG when you want to keep editing in a RAW workflow, and to TIFF when you want a finished, edit-ready master that any tool can open. Many photographers keep both: a DNG archive plus a TIFF working master per shot.

What's the difference between .tiff and .tif?

None — they're the same format with two extensions for historical DOS-era compatibility (the 8.3 filename limit forced .tif). Pick whichever your downstream tools or naming conventions prefer. Our File extension dropdown lets you choose either; the bytes inside the file are identical.

How big will my TIFF be compared to the X3F?

Larger, usually 3–8x. A 46 MP three-layer Merrill X3F is ~50 MB on disk. The same image demosaicked to a 16-bit RGB TIFF is roughly 265 MB uncompressed, ~120–180 MB with ZIP compression, or ~40–80 MB with JPEG-in-TIFF. The growth is because X3F stores compressed sensor data while TIFF stores processed full-color pixels.

Will the TIFF open in Lightroom and Capture One?

Yes. Both treat 16-bit TIFFs as first-class catalog files — you can import, develop, mask, and export from them just like a RAW. The trade-off is that you lose the wide RAW latitude (recoverable highlights, shadow lift headroom) that the X3F still has. If you need the full RAW envelope inside Lightroom, convert X3F to DNG first.

Will my Sigma camera's EXIF and lens metadata survive?

Camera model, lens, focal length, aperture, shutter speed, ISO, and capture date are written into the TIFF's standard EXIF tags. Sigma-specific maker-note fields and the proprietary Foveon-layer metadata don't have direct TIFF equivalents and are dropped. For a workflow that round-trips all the Sigma-specific metadata, stay in X3F or DNG.

Why is JPEG even an option inside TIFF? Isn't that defeating the purpose?

JPEG-in-TIFF is a legacy feature from the TIFF 6.0 spec (1992) that lets you wrap a JPEG-compressed image in a TIFF container — useful when a pipeline requires a .tiff extension but doesn't need lossless data. It cuts the file size by roughly 70% versus uncompressed TIFF. For Foveon masters destined for editing or print, pick LZW or ZIP instead; for lightweight editing copies that will be flattened later, JPEG-in-TIFF is reasonable.

My TIFF won't open — it says "file too large" or "invalid format."

Classic TIFF uses 32-bit byte offsets, capping files at 4 GB. If your Foveon shoot composite or focus-stack TIFF crosses that line, you need BigTIFF (64-bit offsets, supported in LibTIFF 4.0+ since 2011, Photoshop, Lightroom, GIMP 2.10+, and most modern apps). For single-image Merrill or Quattro TIFFs the 4 GB ceiling is irrelevant — even a 16-bit floating-point 50 MP image is well under 1 GB.

How does this compare to using Sigma Photo Pro to export TIFF?

SPP gives you the best Foveon demosaic Sigma's own engineers can build, plus their X3 Fill Light tone tool — but it's slow, only runs on macOS/Windows desktops, and ties you to one machine. This converter is faster for bulk turnaround, runs entirely in your browser, and outputs TIFFs that drop straight into the same downstream tools (Photoshop, Lightroom, Capture One). For maximum demosaic quality on a hero shot, use SPP; for everything else, batch through here.