Free Spectroscopy Software for Spectral Analysis

SpectralBench is a free, browser-based spectroscopy workbench with twelve integrated tools for scientists, students, and engineers who need to view, convert, compare, preprocess, and analyze spectral data without installing desktop software. As an entirely client-side spectral analysis application, your data never leaves your machine — making it ideal for proprietary research and regulated environments. Open JCAMP-DX, SPC, Bruker OPUS, and CSV files instantly in any modern browser. From multi-spectrum overlay and spectral math to HQI library searching, FTIR/Raman/UV-Vis peak identification, and publication-ready SVG export, SpectralBench delivers professional-grade spectroscopy software at zero cost.

Spectroscopy Tools

Spectral File Viewer

Multi-spectrum overlay with color-coded traces, spectral math (subtract, average, ratio), SVG export with journal presets. JCAMP-DX, SPC, OPUS, CSV.

Spectral File Converter

Convert between spectroscopy file formats with batch processing and ZIP download. SPC binary export, MATLAB output, clipboard copy. Metadata preserved.

FTIR Peak Identifier

Automatic peak detection and functional group assignment for FTIR spectra. Co-occurrence rule engine identifies compound classes. 80+ functional group entries.

Raman Peak Identifier

Upload a Raman spectrum and identify materials, polymers, minerals, and carbon compounds. 65+ Raman band entries with confidence scoring.

Compare Spectra

Compare two or more spectra with overlay, stack, difference, mirror, and split views. HQI similarity scoring for quantitative matching.

Spectral Library Search

Match your unknown spectrum against a curated library of 100-200 reference compounds. HQI-ranked results for FTIR, Raman, and UV-Vis.

Spectral Preprocessing

Baseline correction (SNIP, polynomial, rubberband), Savitzky-Golay smoothing, normalization, and derivatives. Batch processing with presets.

Spectroscopy Unit Converter

Convert between wavenumber (cm⁻¹), wavelength (nm, μm), frequency (THz), and energy (eV, kJ/mol) using NIST constants.

Beer-Lambert Law Calculator

Calculate absorbance, molar absorptivity, path length, or concentration with an interactive concentration-vs-absorbance graph.

SNR Calculator

Signal-to-noise ratio calculator with linear and dB output, quality rating, and detection limit estimation for spectroscopy.

SaMD Classification Wizard

Determine your spectroscopy software's FDA SaMD risk classification (Class I/II/III) and regulatory pathway (510(k), De Novo, PMA) in 5 questions.

Spectroscopy ROI Calculator

Calculate how much your lab could save by automating spectroscopy workflows. Model test volume, labor costs, and see projected annual savings.

Why SpectralBench

100% Client-Side Processing — All spectral data is processed in your browser. Nothing is uploaded to a server. Your research data stays private, making SpectralBench safe for proprietary formulations, pre-publication research, and HIPAA-adjacent workflows.

No Installation Required — Works in any modern browser on Windows, macOS, Linux, and Chromebooks. No downloads, no license keys, no IT department approval needed. Open a tab and start analyzing spectra immediately.

Multi-Format Support — Read JCAMP-DX, Thermo/Galactic SPC, Bruker OPUS, CSV, and plain text files. Convert between formats instantly without data loss or metadata stripping.

Built for Spectroscopists — Not a generic chart tool. Purpose-built for FTIR, Raman, UV-Vis, NIR, and SERS workflows by the team behind SpectraDx. Every feature is designed for real spectroscopy tasks, from peak picking to Beer-Lambert quantitation.

Supported Spectral File Formats

JCAMP-DX (.jdx, .dx): — IUPAC/JCAMP standard for spectroscopic data exchange
SPC (.spc): — Thermo/Galactic GRAMS format, widely used in analytical labs
Bruker OPUS (.0, .1, etc.): — Binary format from Bruker FTIR instruments
CSV (.csv): — Comma-separated values, universal tabular format
TXT (.txt): — Tab or space-delimited plain text spectral data

Who Uses SpectralBench

SpectralBench serves analytical chemists in research and industrial labs, materials scientists and polymer researchers characterizing samples, chemistry students and university teaching labs running spectroscopy experiments, QA/QC teams in pharmaceutical and manufacturing settings validating materials, and spectroscopy researchers working with FTIR, Raman, UV-Vis, NIR, or SERS data who need a fast, free alternative to expensive desktop software.