CR3 to JPG Converter

Canon's current mirrorless and DSLR cameras — the EOS R series, the M50 and the 90D among them — save raw photos as CR3. A CR3 file holds the compressed sensor data and, in a separate track, a full-resolution JPEG the camera rendered with your Picture Style. This tool reads the CR3 container, extracts that JPEG and saves it as a normal .jpg that every phone, website and editor opens. The work happens in your browser; nothing is uploaded.

How to use this tool

1. Drop one or more .cr3 files into the box.
2. Keep "Keep the camera JPEG unchanged" for an exact, lossless copy, or re-encode to set quality and a maximum size.
3. Check the table for the JPEG size and the camera image size.
4. Download each JPG, or all of them as a ZIP.

Formula

CR3 = ISO base media file (like MP4), brand "crx ". moov → trak 1 → mdia → minf → stbl: the sample size (stsz) and chunk offset (co64) give the position of track 1, sample 1 — the full-size JPEG. The Canon uuid box holds CMT1 (a TIFF directory with the orientation) and a 160 × 120 thumbnail; another uuid box holds a 1620 × 1080 preview (PRVW).

All candidates are checked by walking their JPEG markers to the end, and the largest one the browser can decode is used. The camera orientation from CMT1 is applied with a small Exif tag in lossless mode, or by rotating the pixels when re-encoding. 64-bit box sizes are supported, so very large files work.

Example

A 24-megapixel CR3 from an EOS R-series camera contains a 6000 × 4000 px JPEG in track 1. The result is that JPEG, byte for byte, as IMG_0001.jpg, with "Full size: Yes". A portrait shot is flagged so viewers show it upright at 4000 × 6000 px. Re-encoding with a max long edge of 3000 px gives a 3000 × 2000 px JPG instead.