Open EDF files in your browser
The file EEG, sleep labs and CPAP machines record into, from a night's polysomnography to a ResMed's breathing. Open one right here, every channel on one timeline, with no EDFbrowser. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your recording opens with each channel as a curve at its own rate on one timeline, its annotations along the top.
- Every channel in its unit • EEG, ECG, sleep and CPAP
- Annotations along the top • Find one by its text
- Patient data hidden until you show it
- Export • PNG, CSV, or the file without patient data
About EDF
Sleep researchers led by Bob Kemp published the European Data Format in 1992 so recordings could move between labs, and EDF+ added annotations and gaps in 2003. EEG and sleep systems export it, PhysioNet's databases use it, and ResMed's CPAP machines write each night's breathing to their SD card as EDFs.
An EDF starts with a header of fixed width text: the patient, the recording, when it began and, for each signal, its label, transducer, unit, physical and digital range and samples a record. Then come the data records, each a few seconds of every signal's 16 bit samples in turn. EDF+ adds a signal of annotations, and BioSemi's BDF keeps 24 bits.
Filepeek reads it in your browser and draws every channel as a curve at its own rate on one timeline, in its unit, with the annotations along the top. A ResMed night dropped as its EDFs opens as one timeline of its flow, pressure, leaks, oximetry and events. Patient data stays hidden until Show patient data. Drag or pinch to move and zoom, put two cursors to read each channel with its lowest, highest, mean and RMS between them, find an annotation by its text, and save the view as PNG, the samples between the cursors as CSV, or the file without patient data.
European Data Format
.edf • .rec
Format
- MIME type
- application/x-edf
- Made by
- Sleep researchers led by Bob Kemp
- Released
- 1992
Inside the file
- Header
- The patient, the recording and when it began
- Signals
- Each channel's label, unit, range and rate
- Records
- A few seconds of every signal's samples
- Annotations
- EDF+'s events and the records' onsets
Opens in every browser
Filepeek opens EDF, EDF+, BDF and BDF+ files in Chrome, Edge, Firefox and Safari, and a ResMed CPAP night as its set of files. On their own, browsers only download them.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Apps that open EDF
- WindowsEDFbrowser, free
- MacEDFbrowser, free
- iPhone and iPadNo app opens it
- AndroidNo app opens it
Questions
How do I open an EDF file without EDFbrowser?
Drop it on this page or choose Peek an EDF. Every channel opens on one timeline in your browser, with its annotations, on a phone too.
Can I look at my CPAP machine's data?
Yes. Drop a night's folder from DATALOG on a ResMed's SD card, or its BRP, PLD, SA2, EVE and CSL files together, and they open on one timeline: flow and pressure, leaks, the oximeter, and each apnea and hypopnea the machine scored along the top.
Is the patient's name shown?
Not until you choose Show patient data. The header's patient and recording fields stay hidden, and Export's Save without patient data writes a copy with them blanked and its date set to 1 January 1985, as EDF+ does for an anonymous recording.
Does it open BioSemi's BDF?
Yes. A BDF opens like an EDF, by its first bytes, its 24 bit samples scaled the same way and BDF+'s annotations along the top.
Can I save a channel as CSV?
Yes. Put the two cursors around the part you need and choose Export, then Save the values, for a column for each channel and a row for each sample.