Felo

7-Segment Display Segment Encoder Online

Turn English letters, digits and periods into the exact segment letters (A–G and DP) you need to light on a 7-segment display. You get a per-character breakdown plus a reverse lookup for segment codes, all as copyable text. Try it online.

What is 7-Segment Display Segment Encoder Online?

7-Segment Display Segment Encoder Online converts ordinary English text into the segment labels that must be illuminated on a 7-segment display. Each character in your message is replaced by the letters A through G that correspond to the lit segments, with DP used for a decimal point. The result is a compact code string you can read against a display datasheet or wiring diagram.

This is a substitution tool, not a translator between human languages. It follows a fixed character table, so the same input always produces the same output.

Key Features

Exact segment encoding. Letters A–Z, digits 0–9 and the period character are mapped to their segment codes using a fixed table.
Per-character breakdown. Instead of one long string, you also see a table listing each character, its code and how many segments it lights.
Reverse lookup. Paste segment codes and get back the characters they represent where the mapping is unambiguous.
Honest handling of unsupported characters. Spaces, punctuation and symbols outside the table are reported clearly rather than silently removed.
Segment-count summary. See the total number of lit segments across your message for quick display planning.

How to Use

Type or paste your English message into the chat, for example HELLO 2024.
Read the encoded output block, which gives the concatenated segment codes in input order.
Check the per-character table to confirm each character and its segment count.
If you need the reverse direction, paste a segment code string and ask for decoding.

A quick before-and-after example: the input A0. encodes to FABGEC for A, AFBECD for 0 and (DP) for the period, giving FABGECAFBECD(DP).

Example Use Cases

Planning a scrolling LED sign. Encode a short message like SALE 50% and see which segments each character needs before you write firmware.
Checking a datasheet pinout. Encode 1234 and compare the segment letters against the display's pin labels to confirm your wiring assumptions.
Teaching digital electronics. Use the per-character breakdown to show students why the digit 8 lights every segment while the digit 1 lights only two.
Reverse-checking a captured code. Paste a segment string from a logic analyzer and ask which characters it could represent.

Tips for Best Results

Keep input to letters, digits and periods for full coverage; anything else is reported as unsupported.
Ask for the per-character table when you need to verify a single character rather than the whole string.
For reverse decoding, remember that some segment patterns are ambiguous, so the tool will list the possible characters rather than guess one.

FAQ

What input formats are supported?
Plain text containing English letters A–Z, digits 0–9 and the period character. Spaces and other symbols are flagged as unsupported rather than encoded.

How accurate is the output?
The mapping is a fixed table, so results are deterministic. Accuracy depends on the table matching your display's segment labeling convention; always confirm against your own datasheet.

How does this compare with some free text tools?
Some free text tools show a single concatenated code string with a generic error marker for unknown characters. This Agent adds a per-character breakdown, a segment count and a supported reverse lookup, and explains unsupported characters instead of dropping them.

Does it draw the display?
No. The output is text: segment letters and a breakdown table. It does not render a picture of a display or produce font files.