X3F to TIFF Converter

How to Convert X3F to TIF 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, dp Quattro, 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 uploaded to a third party.
2. Pick a Quality Preset: Default is Very High (Recommended), which demosaics the three Foveon layers at full sensor 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 thumbnails.
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 TIFs at editing-grade quality, PackBits for legacy print workflows, or None for maximum compatibility with older imaging pipelines. The File extension dropdown is preset to TIF (.tif) — switch to TIFF (.tiff) if a downstream tool expects the long form; the bytes inside are identical. Resize with Resolution Percentage, Preset Resolutions, or explicit Width x Height if you don't need full Foveon resolution.
4. Convert and Download: Click "Convert". Each output is delivered as an Adobe/Aldus TIFF (with a .tif suffix) you can open directly in Photoshop, Lightroom, Affinity Photo, Capture One, GIMP, IrfanView, ACDSee, or any DAM that ingests TIFFs. No watermarks, no sign-up, no Pro tier.

Why Convert X3F to TIF?

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 rather than 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, X3Fuse, RawTherapee) can actually read X3F natively. Converting to a 16-bit TIF bakes the demosaicked Foveon image into a format every professional photo tool on the planet understands.

The .tif extension specifically (versus .tiff) is a holdover from the FAT 8.3 filename limit — DOS, Windows 3.x, and ISO 9660 CD-ROMs all capped extensions at three characters. Many print RIPs, archival ingestion pipelines, government records systems, and legacy Windows imaging tools still expect or require the three-letter form. Pick this page when your downstream system asks for .tif explicitly; otherwise the byte-identical X3F to TIFF page produces the long-form extension.

• Edit in Lightroom, Capture One, or Affinity Photo — None of these read X3F directly. A 16-bit TIF 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 TIF library means you only pay the demosaic cost once.
• Feed legacy print and archival pipelines that require .tif — Pre-press RIPs from the 1990s, library digitisation suites, and some government records systems still validate the three-letter extension. A .tif from this page goes straight in without renaming.
• 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, public spec since 1992) will outlive both SPP and any future Sigma RAW pipeline.
• High-resolution print and reproduction — A 16-bit TIF 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 TIF 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 TIFF for the long-form .tiff extension. Converting other camera RAWs? Try DNG to TIFF, CR2 to TIFF, ARW to TIFF, or NEF to TIFF. Bring TIFs back down to size with Compress TIFF or repackage to TIFF to PDF.

X3F vs TIF — Format Comparison

TIFF Compression Type — Which to Pick

For Foveon TIF 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

Is .tif the same as .tiff?

Yes — byte-for-byte identical. Both extensions point to the same Tagged Image File Format spec (TIFF 6.0, published by Aldus in June 1992 and now maintained by Adobe). The three-letter form exists because the FAT filesystem used by DOS, Windows 3.x, and ISO 9660 CD-ROMs limited extensions to three characters. Modern apps recognise both interchangeably; if you rename image.tiff to image.tif nothing changes about the data. Use this page when your downstream system specifically expects the three-letter form, and the X3F to TIFF sibling when you want the long form.

Will I lose Foveon color data converting X3F to TIF?

Not if you use 16-bit TIF with lossless compression (None, LZW, or ZIP). The demosaic step itself bakes in whatever rendering choices the converter makes (white balance, X3 Fill Light, colour profile), but the resulting 16-bit per-channel TIF 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. TIF bakes those decisions into pixels. Convert to DNG when you want to keep editing in a RAW workflow, and to TIF when you want a finished, edit-ready master that any tool can open. Many photographers keep both: a DNG archive plus a TIF working master per shot. X3Fuse and Iridient X-Transformer both produce DNG from X3F if that's the route you want.

How big will my TIF 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 TIF 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 TIF stores processed full-colour pixels. If size matters, switch the Compression Type to ZIP/Deflate for lossless or JPEG for editing copies.

Will the TIF open in Lightroom and Capture One?

Yes. Both treat 16-bit TIFs as first-class catalogue 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 .tif 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 TIF won't open — it says "file too large" or "invalid format."

Classic TIFF uses 32-bit byte offsets, capping files at 4 GB. If a Foveon composite or focus-stack TIF crosses that line, you need BigTIFF (64-bit offsets, supported in LibTIFF 4.0+ since its stable release in December 2011, Photoshop, Lightroom, GIMP 2.10+, and most modern apps). For single-image Merrill or Quattro TIFs 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 TIF?

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 and Windows desktops, and ties you to one machine. This converter is faster for bulk turnaround, runs entirely in your browser, and outputs .tif files 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.