# EDF & BDF Viewer

> Waveform file inspector

Canonical page: [https://chrome-stats.com/d/id6801383472](https://chrome-stats.com/d/id6801383472)

## Overview

- **ID:** `id6801383472`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Yiwei Zhang
- **Category:** Utilities
- **Version:** 1.0
- **Last updated:** 2026-08-24
- **First published:** 2026-08-21
- **Size:** 1.14 MB
- **Data as of:** 2026-09-20
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/edf-bdf-viewer/id6801383472)
- **Website:** [https://zywkloo.github.io/edfviewer/](https://zywkloo.github.io/edfviewer/)
- **Privacy policy:** [https://zywkloo.github.io/edfviewer/#privacy](https://zywkloo.github.io/edfviewer/#privacy)

## Description

Open EDF and BDF recordings on iPad and Mac. Browse every channel, tap to read exact values, and inspect the full file header.

EDF & BDF Viewer opens biosignal recordings stored in the European Data Format (EDF, EDF+) and the BioSemi Data Format (BDF) — the file formats used across sleep, EEG, ECG and electrophysiology research.

One app for iPad and Mac. No installer, no Java, no Python environment, no account. Open a file and look at your data.

VIEW YOUR RECORDING
• All-Channels montage — every channel stacked in one scrollable view.
• Channel browser showing sample rate and physical unit at a glance.
• Min/max envelope rendering, so a spike is never lost to naive decimation the way simple downsampling loses it.
• On iPad, pinch to zoom and swipe horizontally with two fingers to move through time. On Mac, swipe with two fingers on a trackpad, drag, or use ⌘+, ⌘- and the arrow keys.
• Tap anywhere to place a measurement cursor and read the exact time and amplitude at that point.
• Fixed amplitude scales as well as auto-fit, so a quiet stretch and a loud one can actually be compared instead of both filling the pane.
• Time and amplitude grid with labelled axes.

KNOW WHAT IS IN THE FILE
• A full header inspector: format and version, start date and time, record layout, and every signal's sample rate, physical unit, physical range and digital range.
• Correct digital-to-physical calibration for both 16-bit EDF and 24-bit BDF.

OPEN FILES FROM ANYWHERE
• Open in place from the Files app on iPad, or double-click in the Finder on Mac.
• Drag a recording onto the window.
• Recent files reopen without hunting for the folder again.
• A synthetic demo recording is built in, so there is something to look at before you have a file of your own.

PRIVACY
No accounts, no analytics, no network features of any kind. Files you open never leave your device, and the developer cannot see them.

IMPORTANT
EDF & BDF Viewer is a file-viewing utility for research, educational, and engineering use. It is not a medical device and is not intended for diagnosis, treatment, or any clinical decision-making.

## Rankings

- #1,691,353 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id6801383472)