Open .CR3 files online

Q: How do I open a .cr3 file online?

Drop the `.cr3` on this page — or click to browse, or paste a URL. The developed image appears with its camera model, dimensions, and lens info; the status bar offers a Download .png of the full-resolution render. The first open fetches the LibRaw engine (~1.1 MB) once from this site's own domain; afterwards it is cached.

Q: What is the difference between CR3 RAW and CRAW?

Both are `.cr3` files with the same container; CRAW is the variant where the camera applied lossy quantization to the wavelet-compressed data, cutting file size to roughly half at a small quality cost. ZipTool opens both identically — the develop pipeline does not change.

A .cr3 file is a Canon RAW v3 photograph — the unprocessed sensor capture a Canon camera writes since 2018 (the EOS M50 was the first; the EOS R line, R-series mirrorless, and every Canon body since followed). Unlike a JPEG, it keeps the raw photosite data (usually 14-bit), the exact white-balance and exposure metadata the camera recorded, and far more tonal headroom for editing. It replaced the TIFF-based .cr2 Canon had used since 2004.

ZipTool develops .cr3 files entirely in your browser: LibRaw — the same open-source RAW engine behind many desktop converters — compiled to WebAssembly demosaics the sensor data, applies the camera's own white balance, and renders an sRGB image you can download as PNG. This is a real RAW develop, not the embedded JPEG preview, which is why it takes a moment on a 24-megapixel file. The engine (~1.1 MB) downloads once from this site's own domain and is cached; your photograph never leaves your device.

What is a `.cr3` file?

CR3 changed the container: instead of CR2's TIFF structure, Canon adopted the ISO Base Media File Format — the same box-structured container family as MP4. The file opens with an ftyp box declaring the crx brand, then boxes carry the metadata (EXIF/XMP), the preview JPEG, and the CMP1-described image data. That is why a .cr3 sniffed as text starts with ftyp rather than II/MM.

The sensor data itself uses Canon's in-house crx codec: a wavelet-based scheme (LeGall 5/3 family) applied per tile, lossless in plain RAW files and quantized in the smaller CRAW variant cameras can also write. CRAW files typically run 40–60% of RAW size with a modest quality trade — they open identically here. Some bodies additionally store Dual Pixel data as an extra image plane, which this viewer does not separate out.

Developing — not just decoding — is what makes a RAW file useful: the sensor stores one filtered value per photosite (red, green, or blue, per the Bayer color filter array), and a demosaic algorithm interpolates the two missing channels at every pixel before white balance, color conversion, and gamma produce a viewable image. ZipTool does exactly that pipeline in the tab, with the AHD interpolation LibRaw uses for its high-quality output.

Photographers reviewing and culling RAW shoots before picking keepers
Checking what a CR3 actually contains before installing Canon DPP or Lightroom
Getting a quick developed look at a RAW file received in a zip or from a client
Exporting a developed PNG from a CR3 without any desktop RAW converter

How to open a `.cr3` online

Open ZipTool in a new tab, then drop your .cr3 onto the page — or click to browse for it, or paste a URL. The file opens in the RAW develop viewer, which runs LibRaw compiled to WebAssembly inside your browser tab — a full demosaic with camera white balance, not the embedded JPEG preview, read entirely on your device.

Drag your .cr3 onto the page — or click to browse, or paste a URL.
It opens immediately in the RAW develop viewer, which runs LibRaw compiled to WebAssembly inside your browser tab — a full demosaic with camera white balance, not the embedded JPEG preview. No install, no sign-up.
Read, search, or copy it. Your file never leaves your browser.

Open `.cr3` without uploading

Most "open cr3 online" sites work by uploading your file to a server and processing it there. ZipTool does the opposite: it loads its parser once, then reads your .cr3 locally in the browser tab. The contents stay on your device.

You can prove that in seconds. Open the page, press F12 for DevTools, switch to the Network tab, and open your file — no request carrying the file's contents is sent. You can also turn off Wi-Fi after the page loads and the file still opens. See security and privacy for the full picture.

Frequently asked questions

Is this a real RAW develop or just the embedded preview?

A real develop. The viewer demosaics the CR3's sensor data with LibRaw (AHD interpolation), applies the camera's as-shot white balance, converts to sRGB, and shows the result — it never touches the small JPEG Canon embeds for thumbnails. That is also why it takes a few seconds on a 24-megapixel file: the browser is doing the same math a desktop RAW converter does.

How do I open a .cr3 file online?

Drop the .cr3 on this page — or click to browse, or paste a URL. The developed image appears with its camera model, dimensions, and lens info; the status bar offers a Download .png of the full-resolution render. The first open fetches the LibRaw engine (~1.1 MB) once from this site's own domain; afterwards it is cached.

What is the difference between CR3 RAW and CRAW?

Both are .cr3 files with the same container; CRAW is the variant where the camera applied lossy quantization to the wavelet-compressed data, cutting file size to roughly half at a small quality cost. ZipTool opens both identically — the develop pipeline does not change.

Which cameras write .cr3 files?

Every Canon interchangeable-lens body from 2018 onward: the EOS M50 first, then the EOS R, RP, R3 through R8, R10/R50/R100, the 90D/M6 Mark II generation, and everything after. Older Canons write .cr2 — TIFF-based, fifteen years of bodies — and those open here now too; see open .cr2 online

Does viewing my CR3 here upload the photo?

No. The develop engine is WebAssembly running in the page; your file is read locally and the pixels are rendered in the tab. The only network fetch is the engine itself (~1.1 MB, one time, from ziptool.app — not a third-party CDN), which matters for unreleased or client work. Press F12 → Network and watch: no request carries your photo. The online RAW viewer develops the whole camera-RAW family — Canon, Nikon, Sony, Adobe DNG — exactly the same way.