SpectralBench
Free, no software required — view and convert OPUS files instantly
Bruker's OPUS format is one of the most common proprietary spectral file formats in analytical chemistry. Every Bruker FTIR spectrometer — Alpha, Tensor, Vertex, Invenio — saves data in this binary format with numbered file extensions (.0, .1, .2, .3).
The catch: you need Bruker's OPUS software to open these files, and a full OPUS license costs $3,500+ per module. Bruker does offer a free OPUS Viewer, but it deliberately cannot export or convert your data — keeping you locked into the Bruker ecosystem. If you need to share data with a collaborator who doesn't have OPUS, or access your spectra on a Mac or Linux machine, you're stuck.
SpectralBench reads Bruker OPUS binary files directly — no installation, no license. Just open any browser on any device, drop your .0 file onto the viewer, and your spectrum appears in seconds — with interactive zoom, peak detection, and format conversion built in.
Need to get your data into Excel? Convert to CSV. Sharing with a collaborator who uses different software? Export as JCAMP-DX, the open spectroscopy standard. Want structured data for Python or MATLAB? Export to JSON or MAT format. All conversions are instant — no waiting, no extra software.
Drag your .0, .1, or .2 file onto SpectralBench. The parser detects the OPUS format automatically.
Your spectrum renders as an interactive chart. Zoom in, detect peaks, toggle absorbance/transmittance.
Convert to CSV, JCAMP-DX, JSON, or MATLAB. Download instantly — no extra software needed.
Bruker's ATR-FTIR instruments — the ALPHA II, VERTEX, and INVENIO series — are among the most widely used in analytical labs. Whether you're using a diamond ATR crystal, ZnSe, or germanium, SpectralBench reads the OPUS files from your ATR measurements directly. No OPUS license, no Windows workstation — just drop the file onto the viewer.
ATR spectra require specific corrections to compare accurately against transmission reference libraries. SpectralBench supports ATR correction workflows so you can convert your Bruker ATR-FTIR data for direct comparison with standard absorbance databases. Combined with automated FTIR peak identification, you can go from raw OPUS file to functional group assignment in seconds.
Common Bruker ATR-FTIR workflows in SpectralBench: diamond ATR correction, atmospheric CO₂/H₂O compensation via baseline correction, peak picking with automatic functional group assignment, and export to CSV or JCAMP-DX for lab notebooks and publications.
| Feature | Bruker OPUS | SpectralBench |
|---|---|---|
| Price | Commercial license (instrument-bundled) | Free |
| Platform | Windows only | Any browser (Mac, Linux, Windows, iPad) |
| File Formats | Proprietary OPUS + limited export | OPUS, JCAMP-DX, SPC, CSV + 25 more |
| Peak Identification | Manual or with paid add-ons | Automatic with confidence scores |
| Installation | Requires software install + license | No install — works in any browser |
| ATR Correction | Built-in (Bruker-optimized) | ATR correction workflow |
| Reference Library | Sold separately ($1,000+/library) | Open reference spectra included free |
| Cross-Platform | Windows only | Any OS, any device |
SpectralBench isn't limited to Bruker files. Open spectral data from any instrument:
Yes. SpectralBench reads Bruker OPUS binary files directly — just drop your .0, .1, or .2 file onto the viewer. You do not need Bruker's OPUS software, a license dongle, or a Windows machine.
Yes. SpectralBench exports Bruker OPUS data to CSV, JCAMP-DX, JSON, SPC, and MATLAB formats. Drop your OPUS file into the viewer, preview your spectrum, and download the converted file instantly.
SpectralBench reads absorbance (AB), transmittance (TR), reflectance, Kubelka-Munk, ATR, Raman, and single-channel data blocks. The parser automatically selects the most useful result spectrum from the available blocks.
Bruker's OPUS software only runs on Windows, which locks Mac and Linux users out of their own data. SpectralBench runs in any modern browser on any operating system — Windows, macOS, Linux, and even mobile devices.
Bruker OPUS uses numbered file extensions (.0, .1, .2, .3, and multi-digit like .0001, .0010, .0100) instead of a conventional extension like .opus. Each number represents a sequential measurement. Most operating systems don't recognize these extensions, which is why you need specialized software — or SpectralBench — to open them.
SpectralBench is a free companion tool for Bruker FTIR spectrometers — Alpha, Tensor, Vertex, and Invenio. It reads OPUS files (any numbered extension) natively, provides automated peak identification, baseline correction, and exports to CSV, JCAMP-DX, JSON, and MATLAB. No OPUS license or Bruker hardware connection required.
Drop your Bruker OPUS file onto SpectralBench in any web browser. Your spectrum loads instantly with interactive zoom, peak detection, and functional group identification. Export to CSV for Excel or JCAMP-DX for sharing — no software to install.
Yes. SpectralBench reads OPUS files from Bruker Raman spectrometers (BRAVO, SENTERRA, RFS) as well as FTIR instruments. It correctly handles Raman shift (cm⁻¹) on the x-axis and provides peak detection tuned for Raman spectroscopy.
Yes. SpectralBench is a free, browser-based alternative to Bruker OPUS. It reads OPUS files (any numbered extension) natively, provides automated peak identification, baseline correction, spectral comparison, and export to CSV, JCAMP-DX, JSON, SPC, and MATLAB — all without a Bruker license, dongle, or Windows machine.