CRW to TIFF Converter

CRW to TIFF Converter

CRW is Canon's original digital-camera RAW format — 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. TIFF is the long-standing professional raster format for print, layout, and lossless archival masters. This pairing is the standard way to preserve an early-digital Canon archive: it renders an obsolete RAW that fewer and fewer programs still open into a flat, broadly readable TIFF that any imaging tool or print RIP can handle. The two tables below describe each format precisely, then a short walkthrough covers the conversion and the one setting that decides whether your TIFF is truly lossless.

CRW Format at a Glance

TIFF Format at a Glance

How to Convert CRW to TIFF

1. Upload Your CRW File: Drag and drop your Canon .crw files onto the page or click "+ Add Files" to browse. Any companion .thm thumbnails are harmless if included, and you can queue a whole folder from an EOS D30, D60, 10D, 300D, or PowerShot G-series at once.
2. Pick a Compression Type: Open Advanced Options and set "Compression Type" — choose LZW, Deflate, PackBits, or None for a mathematically lossless archival TIFF. The default is JPEG, which is lossy, so switch it if you want a true preservation master.
3. Set the Quality Preset and Extension (Optional): Leave "Quality Preset" on "Very High (Recommended)" to preserve detail, keep "Image resolution" on "Keep original" unless you want to scale down, and pick the "TIFF" or "TIF" extension to match your software.
4. Convert and Download: Click "Convert" and download your TIFF. No sign-up, no watermark.

Frequently Asked Questions

Is the CRW format still maintained or readable in current software?

No — CRW is effectively frozen, and support is thinning. Canon retired it after 2004 in favor of the TIFF-based CR2 (and later the CR3), and the format was never updated again. Because CRW predates most modern RAW pipelines and was reverse-engineered rather than publicly documented, newer photo apps increasingly drop it from their importers, and CRW reading now leans on a small set of tools — libopenraw, dcraw, ExifTool, and Canon's Digital Photo Professional. That thinning support is the main reason to convert while you still can: a rendered TIFF stays openable in any imaging program even as the last CRW-aware decoders disappear. Keep the original .crw files too, since they are your only full-quality source.

Will my TIFF actually be lossless, given the default is JPEG?

Only if you change the compression. This page defaults the "Compression Type" dropdown to JPEG, which writes a smaller but lossy file — so the single most important step for an archival TIFF is to switch it to LZW, Deflate, PackBits, or None, all of which are mathematically lossless and discard nothing at the encode step. Separately, the render that turns the CRW's Bayer mosaic into ordinary RGB pixels bakes in a default white balance and exposure, and that interpretation is the part you can no longer freely undo; with a lossless compression chosen, the pixel fidelity of that render is fully intact.

Does converting to TIFF preserve the CRW's RAW editing latitude?

No. A CRW stores roughly 10–12-bit linear sensor data — the unprocessed signal that lets you recover blown highlights or reset white balance long after the shot. Making any standard image, TIFF included, requires the converter to demosaic that sensor data into ordinary RGB pixels and bake in white balance, exposure, and tone, so even a lossless TIFF is a finished picture rather than RAW — the latitude does not survive. Treat the TIFF as a high-quality print, layout, or preservation copy, and keep the .crw as your editable master for Canon's Digital Photo Professional, Lightroom, or RawTherapee.

Do I get a 16-bit TIFF from the CRW sensor data?

This page renders to a standard high-fidelity TIFF and does not expose a bit-depth selector, so you cannot hand-pick 8-bit versus 16-bit output here. That is a smaller distinction for CRW than for later RAW formats: these files came off early-digital sensors in the 3–6 MP class, and for print and archival use the rendered TIFF holds the captured detail without a problem. If you specifically need a controlled 16-bit export for heavy grading, do that step in a RAW editor that reads CRW — Lightroom, RawTherapee, or Canon DPP — and export the TIFF from there.

Why is the TIFF so much larger than the CRW file?

The CRW stores a single, Huffman-compressed Bayer mosaic — one value per photosite behind a color filter array. A TIFF stores fully rendered RGB pixels, three color planes for every pixel, so even with lossless LZW or Deflate the file is substantially larger than the CRW it came from. That growth is expected and is the cost of holding a flat, finished image. If size matters more than archival fidelity, render a smaller CRW to JPG copy for sharing, or a modern CRW to AVIF copy for the web, and keep the TIFF as the preservation master.

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

None — .tiff and .tif are two spellings of the same Tagged Image File Format, a holdover from the old eight-dot-three filename limit, and this page produces the identical bytes either way. Use the extension selector to match whatever your software expects. If your workflow specifically wants the three-letter name, the CRW to TIF page outputs the same file with a .tif extension.

How are my files handled during conversion?

In our testing, a 3 MP CRW from an early Canon DSLR rendered to a lossless LZW TIFF ran several times the size of the original RAW — normal for a flat RGB image, since one compact Bayer mosaic becomes three full color planes. Your file is uploaded over an encrypted connection, rendered into a TIFF 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. For irreplaceable originals, keep the .crw archived alongside the TIFF you produce.