CRW to TIFF Converter

CRW vs TIF — Which Should You Convert Your Canon RAW To?

CRW is Canon's original digital RAW — the unprocessed sensor file its earliest cameras wrote in the early 2000s, stored in Canon's own CIFF container rather than the TIFF-based CR2 that replaced it. TIF (TIFF) is the long-standing archival and print master format. If your goal is a lossless, print-ready copy that opens in every professional imaging tool — and a hedge against the day no software reads CRW anymore — convert to TIF and keep the .crw as your editable master. If you only need a shareable picture, a JPG or AVIF copy is smaller and opens everywhere.

CRW vs TIF: What You Keep and What Changes

When to Pick CRW (Keep the Original)

• You may want to re-edit later. CRW holds the unprocessed sensor signal, so white balance, exposure, and highlight recovery stay adjustable. A TIF render bakes those in.
• It is your only copy. Files from a 2000–2004 Canon body are often irreplaceable; the original .crw is the full-quality source. Render a copy to TIF and archive the CRW alongside it.
• You develop in a RAW editor. Canon's Digital Photo Professional, Lightroom, or RawTherapee read CRW and give you control over the look before you export.

When to Pick TIF

• You need a print or archival master. With LZW or DEFLATE the TIF is losslessly compressed and reads in every professional imaging and print tool — the format institutions standardize on for long-term fidelity.
• The software that opens CRW is thinning. CRW reading depends on a small set of libraries (libopenraw, dcraw, ExifTool, Canon DPP); some users lost CRW support after an OS update. A TIF no longer depends on a CIFF decoder.
• You want a flat, editable file. A rendered TIF drops straight into Photoshop, GIMP, or a layout program without a RAW develop step.

How to Convert CRW to TIF

1. Upload Your CRW File: Drag and drop your Canon .crw files onto the page or click "+ Add Files" to browse — straight off an EOS D30, D60, 10D, 300D, or a PowerShot G1–G6 / Pro1 / S30–S70. Any companion .thm thumbnails are harmless if included, and you can queue a whole folder at once.
2. Pick a Compression Type: Open Advanced Options and set "Compression Type" to LZW or DEFLATE for a lossless TIF that opens in any professional tool — both shrink the file with no pixel loss. The dropdown defaults to JPEG, which is lossy and not read by every print or imaging program, so switch away from it for archival work. PACKBITS is also lossless if you need maximum compatibility, and NONE writes an uncompressed TIF.
3. Set Quality and Resolution (Optional): Leave "Quality Preset" on "Very High (Recommended)" to hold detail, and use "Resolution Percentage" or a preset only if you want to scale the photo down — "Keep original" preserves full size. Pick the .tif or .tiff spelling under "File extension" to match your workflow.
4. Convert and Download: Click "Convert" and download your TIF. No sign-up, no watermark.

Frequently Asked Questions

Will I lose the RAW editing latitude by converting CRW to TIF?

Yes, and it is the one trade worth understanding before you archive. A CRW stores the unprocessed linear sensor signal — what lets you recover blown highlights or reset white balance long after the shot. To write any TIF, the converter must demosaic that data into ordinary RGB pixels and bake in white balance, exposure, and tone. With LZW or DEFLATE the resulting pixels are preserved exactly (mathematically lossless), but the latitude is not. Because these files came off cameras Canon stopped making after 2004 and may be your only copy, render a copy to TIF and keep the original .crw as your master. If you want control over the look, develop the CRW in a RAW editor first, then convert the result.

Is the CRW format still readable, or should I migrate it to TIF now?

CRW is effectively frozen and support is thinning, which is the main reason to make a TIF copy. Canon retired CRW after 2004 in favor of the TIFF-based CR2 (and later CR3), and the format predates most modern RAW pipelines — it was reverse-engineered rather than publicly documented, so newer apps increasingly drop it from their importers, and some users lost CRW support outright after an OS update. A few desktop tools (Canon DPP, Adobe Camera Raw, RawTherapee, ExifTool) still read it, but those are exactly the programs that may not be around in another decade. Rendering a TIF now, while CRW decoders still exist, is a sensible preservation move. Keep the .crw files too — they are your only full-quality source.

Does converting CRW to TIF lose any quality at the encode step?

Not if you pick a lossless compression type. The catch is the default: this converter's "Compression Type" dropdown starts on JPEG, which is lossy — leave it there and the TIF discards image data like an ordinary JPEG would. Switch to LZW or DEFLATE and the encode is mathematically lossless: every rendered pixel is preserved, the file just gets smaller without quality loss. PACKBITS is lossless too (slightly larger, maximum compatibility), and NONE writes a fully uncompressed TIF. The only unavoidable change is the RAW-to-RGB render itself, which happens no matter which target you choose.

Why TIF instead of JPG or AVIF for archiving these old Canon files?

It depends on the file's job. TIF is the right target when the copy is a preservation or print master: with LZW or DEFLATE it is losslessly compressed and reads in every professional imaging and print tool, which is exactly what a 20-year-old archive wants. The downside is that TIFF is not a web format — only Safari displays it natively, per MDN — so for sharing or the web, render a CRW to JPG copy for universal compatibility or a CRW to AVIF copy for small, current-browser delivery. Many people keep a TIF master plus a JPG or AVIF copy.

How much bigger will the TIF be than the original CRW?

Expect it to grow, often several times over. In our testing, a full-resolution CRW from an early Canon DSLR rendered to an LZW TIF came out several times larger than the raw it started from, because the TIF stores fully rendered RGB across three color planes rather than a single sensor mosaic — and the source files themselves are already only a few megabytes from a 3–6 MP sensor. LZW or DEFLATE keeps that size in check while staying lossless; if size matters more than print fidelity, convert to JPG instead or downscale with the "Resolution Percentage" control. For irreplaceable originals, keep the .crw archived alongside the TIF.

Is there any difference between the .tif and .tiff output?

No — they are the same TIFF file with a different spelling of the extension. Some print shops, scanners, and older Windows software expect the three-letter .tif; many modern tools accept either. Pick whichever your workflow wants under "File extension." If you specifically need the four-letter form, CRW to TIFF produces an identical file with the .tiff extension.

How are my files handled during conversion?

Your CRW is uploaded over an encrypted connection, rendered and encoded into TIF on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, and your photos are never shared or made public. The main practical limit on a big upload is its size and the time it takes to send, not your device, since RAW files run several megabytes each. For irreplaceable originals, keep the .crw archived alongside the TIF.