SMS Character Counter

SMS character counter to calculate message length, encoding (GSM vs Unicode), and multi-part SMS segments. Avoid extra charges and optimize text messages for delivery.

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Platform Specification

Understanding SMS Character Limits

A standard SMS allows up to 160 characters using GSM-7 encoding.

If your message includes Unicode characters such as emojis, the limit drops to 70 characters per message.

160 GSM-7 Limit
Standard single SMS message
70 Unicode Limit
Per message with emojis/special chars
153 / 67 Multipart Limit
Per segment in concatenated SMS

How Platform Counts Characters (Mobile Optimized)

Platform algorithms count every element. Understanding this helps avoid truncation.

Element	Weight (Count)	Note
Standard GSM-7 characters	1 char	Letters, numbers, and common symbols use GSM-7 encoding.
Unicode characters (e.g., emoji)	Unicode encoding	Switches limit to 70 characters per message.
Concatenation header	7 chars reserved	Reduces per-part limit in multi-part messages.
Line breaks	1 char	Each line break counts toward total length.

Best Engagement Practices

Follow these rules to maximize reach.

Keep It Short

Aim to stay within a single 160-character message.
Lead With Value

Place the most important information at the beginning.
Avoid Extra Segments

Crossing the limit increases message cost.
Use Emojis Carefully

Emojis trigger Unicode and reduce the character limit.

SMS Message Optimization Checklist

Review this checklist before sending to ensure clarity, deliverability, and cost efficiency.

Ready to Send SMS

Stay within 160 GSM-7 characters when possible

Avoid unnecessary Unicode characters

Place key message at the beginning

Include a clear call to action

Check if message splits into multiple parts

FAQ – SMS Character Counter

Answers to common questions about SMS length, encoding, and message splitting.

What is the standard SMS character limit?

A single SMS allows up to 160 characters using GSM-7 encoding. If Unicode characters are used, the limit drops to 70 characters per message.

What happens if I exceed the limit?

Your message will be split into multiple parts (concatenated SMS). Each part has a slightly reduced limit due to technical headers.

Why does the character limit drop with emojis?

Emojis and certain special characters require Unicode encoding, which reduces the per-message limit from 160 to 70 characters.

How many characters are allowed in multi-part SMS?

For concatenated messages, GSM-7 allows 153 characters per part, and Unicode allows 67 characters per part.

Does message length affect cost?

Yes. Each SMS segment is billed separately, so longer messages that split into multiple parts increase costs.

How can I reduce SMS costs?

Keep messages concise, avoid unnecessary emojis or special characters, and monitor encoding to prevent accidental Unicode conversion.

Why Use an SMS Character Counter?

SMS length directly affects delivery, readability, and cost.

By accurately tracking character count and encoding type, you can prevent unexpected message splitting, control campaign expenses, and ensure your most important information is delivered clearly within a single message whenever possible.