Biosignal Tools

Biosignal Tools

Browser-based tools for physiological recordings: open EDF, EDF+ and BDF files from sleep studies, EEG and ECG, without uploading them.

EDF Viewer

EDF Viewer

NEW!

Open EDF, EDF+ and BDF files in your browser: header fields, signal list, sample rates, annotations, per-channel statistics and a waveform viewer.

edf vieweredf file viewer onlineopen edf file

Why Use Biosignal Tools?

Tools for sleep technologists, neurophysiology and cardiology staff, biomedical researchers and the engineers who integrate their equipment. Inspect European Data Format recordings — polysomnography, routine and ambulatory EEG, ECG and other long physiological signals — directly in the browser. Check headers, channels, sample rates and annotations, detect truncated or inconsistent files, and browse waveforms without installing software or sending patient recordings to a server.

Frequently Asked Questions

Which biosignal file formats are supported?

The European Data Format family: EDF, EDF+ (continuous and discontinuous) and BioSemi BDF/BDF+. These are the formats most sleep laboratories, EEG systems and public research databases use to exchange long physiological recordings.

Are my recordings uploaded?

No. Files are read locally in your browser with JavaScript and never transmitted. That matters because EDF headers commonly include a patient identification field with names, birthdates or hospital numbers.

Who are these tools for?

Sleep technologists, neurophysiology and cardiology technicians, researchers working with public datasets, and software or integration engineers who need to check what a biosignal file really contains.

Can these tools be used for clinical decisions?

No. They are inspection and data-quality utilities. They do not apply clinical filtering, montages or scoring and are not medical devices, so they must not be used for diagnosis or treatment.