Morse Code Flashlight: Send SOS and Messages Using Light
Turn words into timed light signals with a free screen flashlight. Flash SOS, send a short message, or press and hold a manual light to practice dots and dashes.
Text to Flashing Morse Code
Enter a message, choose a readable speed, and start the screen-light sequence.
Quick messagesSpeed is deliberately limited for clearer visual signals. Browser timing and screen brightness vary by device.
Ready. Flashing is off.
Manual flashlight keyPress and hold to illuminate the panel. Release to turn it off. You control the length of each signal.
Manual mode is idle.
How to Use the Morse Code Flashlight
Enter a message
Type letters, numbers, or supported punctuation. Use SOS to practice the classic distress pattern.
Choose your speed
Start slowly. Give each dot, dash, letter, and word enough time to be recognized.
Start or go full screen
Watch the signal panel or enlarge it to fill your screen. The STOP button stays visible.
The tool encodes text locally in your browser. Its main light source is your screen, not your phone’s camera LED. You can set your device’s screen brightness manually for clearer signals.
How Does Morse Code Work With a Flashlight?
A flashlight sends Morse by switching light on and off. A short flash represents a dot and a longer flash represents a dash. Darkness between flashes is part of the message: the length of a pause shows whether the next flash continues the same letter or begins a new letter or word.
The written separator / in a Morse preview is a convenient way to show a word gap. When the light plays, it does not flash an actual slash: it leaves a longer period of darkness.
These relative durations follow ITU-R M.1677-1, International Morse Code.
How to Flash SOS in Morse Code
SOS is three short signals, three long signals, and three short signals. In the formal distress prosign, they are sent as one continuous group: ...---.... The readable display ... --- ... shows the familiar S, O, and S letter patterns.
Three short flashes
On briefly three times, with a short dark gap between flashes.
Three long flashes
Keep each long flash approximately three times as long as a short one.
Three short flashes
Finish with three short flashes. For the formal SOS prosign, keep ordinary intra-character gaps across the full signal.
This page flashes the SOS preset as the continuous distress pattern, while its text preview keeps the three letters separated for learning. Use a real emergency channel whenever available rather than relying on a webpage light signal.
Phone Screen Light vs the Camera Flashlight
| Feature | Phone or laptop screen | Phone camera LED |
|---|---|---|
| Works in this tool | Yes, in a modern browser | No, not enabled by this tool |
| Permission | No camera permission required | Browser torch access may require camera permission |
| Brightness | Depends on display and its settings | May be brighter and more directional |
| Best use here | Visual practice and short-range demonstrations | Use a device-native flashlight if you need a separate LED |
Browser camera-torch support varies, so websites should not promise they can control every phone LED. A full-screen white and black panel is the dependable option for a browser-based Morse lesson. No camera access or upload is requested on this page.
How to Read Flashing Morse Code
Watch the complete rhythm rather than counting brightness alone. First identify short and long light pulses. Then group signals until you reach a longer letter gap. Decode that group with the Morse Code Alphabet or the Morse Code Tree.
| Message | Written Morse | Light pattern |
|---|---|---|
| HI | .... .. | 4 short, letter pause, 2 short |
| HELP | .... . .-.. .--. | Four distinct character groups |
| YES | -.-- . ... | Long/short groups separated by letter pauses |
| NO | -. --- | Long short, then three long |
Manual Flashlight Mode: Send Your Own Dots and Dashes
Automatic flashing is useful for checking the correct pattern, but manual sending helps build timing. Hold the manual button briefly for a dot and approximately three times longer for a dash. Release to create the dark gap. Use the Morse Code Tapping tool if you want your manual presses classified and decoded into text.
Common Morse Flashlight Mistakes
Making dashes too short
The dash should last three dot units, rather than just slightly longer than a dot.
Ignoring dark gaps
Without different element, letter, and word gaps, the same flashes can become difficult to interpret.
Flashing too quickly
Start with a slow speed for visual recognition. Fast flashing is harder to read and may be uncomfortable.
Assuming every phone LED works in a browser
Screen flashing and direct camera-torch control are different capabilities.
Letting the screen sleep
Keep your device awake and the browser tab visible while using the visual signal.
Using the tool as your emergency plan
Call emergency services or use appropriate radio and distress equipment first when available.
Morse Code Flashlight FAQs
How do you use a flashlight for Morse code?
Switch the light on briefly for a dot, hold it longer for a dash, and keep clear dark gaps between signals, letters, and words.
Can I send SOS with my phone screen?
Yes. Select SOS and start the screen light. The tool flashes three short, three long, and three short signals in a continuous distress-prosign pattern.
Does the tool turn on my phone’s LED flashlight?
No. It flashes your screen. Direct camera LED control is not implemented here and is not supported consistently across browsers.
How fast should a Morse flashlight flash?
Start slowly, especially while learning. This tool provides a 3 to 6 WPM range for visual practice.
What is a dash when using light?
A dash is a long light pulse lasting three times a dot’s duration.
What separates Morse code letters in light?
A dark gap equal to three dot units separates letters. Seven dot units separate words.
Does the Morse flashlight work on desktop?
Yes. A desktop or laptop screen can show the black and white signal panel without camera permission.
Will the flashlight work if I switch tabs or lock my phone?
It may not. Browsers can pause timers or dim the display when a tab is hidden or the phone locks. Keep the tool visible and your display awake.
Can flashing light trigger photosensitivity?
Yes, for some people. Flashing starts only after you press Start, and Stop remains available. Avoid using it around anyone who may be sensitive to flashing lights.
Can I use this flashlight instead of emergency services?
No. It is a practice and demonstration tool, not a certified distress device or a substitute for established emergency communication.
Related Morse Code Tools
Technical Reference
Morse character mappings and the 1:3:7 timing relationship follow the International Telecommunication Union recommendation ITU-R M.1677-1. The timed screen display is an educational implementation; browser timer precision and actual screen performance vary.