Free search data is shared to update the library; paid data stays private and is not used for training.
Paid users get full AI reports; free users get simplified reports. View Example Report
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Reference library
Search a daily-updated IR spectral library and get AI conclusions
A 320,000+ record database built from in-house data, open datasets, user contributions, literature, patents and other authoritative sources — updated continuously to improve match success.
Free searches contribute to the public library; paid searches remain private. Explore institutional subscription benefits
Image → CSV Extractor
Digitize spectrum figures from papers, reports, or screenshots into downloadable CSV curves.
Extract curve from imageNative Format Converter
Convert raw vendor files (.spa, .spc, .0, .dpt, .jdx) into CSV, JCAMP-DX, or JSON.
Convert instrument filesPeak & Group Lookup
Search characteristic wavenumbers (e.g. 1712 cm⁻¹) or functional groups with literature citations.
Look up peaks & groupsFind Reference Spectrum
Look up standard spectra directly by compound name, CAS number, formula, or spectrum ID.
Search by name or CASAI Analysis Reports
Three dedicated AI reports for specific sample questions
Submit your spectra and sample background. The analysis runs privately, never enters the public library or training data, and emails a structured PDF report with literature evidence directly to you.
Spectrum Comparison
Compare two spectra band by band (for example incoming versus qualified reference, failed versus known-good, or before versus after treatment), identify meaningful peak differences, and cite supporting literature.
Peak Assignment
Assign the absorption peaks of a sample with known composition to functional groups and bond vibrations, with traceable published DOI references for manuscripts and reports.
In-Depth Interpretation
For difficult unknowns, mixtures or degraded samples, combine library retrieval, sample context and literature evidence to propose likely components with supporting peak evidence.
FTIR.fun Local · Fully offline
A traditional IR workstation, installed in your laboratory
The fully offline edition: installed on the instrument computer and runs without any internet connection. Raw spectra, reference libraries and analysis stay on that workstation. Its workflow is identical to a traditional infrared workstation.
Spectrum Discussion Forum
Discuss difficult spectra with administrators and the community
- IR Absorption Table
- The first step in the FTIR setup process is to convert the wide-spectrum light source into parallel light.
- Enviro-tec JB4026 CCS Bitzer Sample Washed - FTIR library search results
- FTIR library search for a methyl 3-nitrobenzoate sample — looking for a second opinion
- FTIR library retrieval discussion for sample L1647_Nuciferine