Skip to main content

GSM-7 encoding

GSM-7 encoding helps businesses fit more text into each SMS by using a compact character set that keeps messages short and predictable. It supports clear, simple wording that is less likely to fragment into multiple segments or change format unexpectedly, which matters for cost and message consistency in high-volume texting. This guide outlines how GSM-7 encoding behaves in real-world use and when it makes sense to rely on it for everyday business messaging.
Start your free trial
Get a Demo

What Is GSM-7 Encoding?

Gsm-7 encoding is a character set and coding scheme used in SMS to represent text using 7 bits per character.

It defines a specific list of supported characters, such as basic Latin letters, numbers, and some common symbols, which phones and networks interpret in the same way.

When you type a message that fits gsm-7 encoding, each character is stored as a compact code, allowing up to 160 characters in a single SMS segment.

The process depends on the mobile device, the messaging app, and the carrier network all agreeing to use the gsm-7 encoding table for that message.

If you include characters outside this set, the message often switches to Unicode, which shortens the available length and can split messages into multiple parts.

This directly affects cost, delivery behavior, and how your message appears to recipients.

GSM-7 Encoding and Its Message Limitations

GSM-7 encoding is especially useful when you send short, transactional SMS messages where every character counts, such as one-time passwords, delivery alerts, and brief service updates. By keeping content within the GSM-7 character set, you preserve the full segment length, which supports clearer copywriting because you do not have to trim important details or split key information across multiple texts. This predictability also helps marketing and support teams write consistent templates, estimate volume accurately, and control messaging costs without sacrificing clarity. In large campaigns or frequent operational notifications, sticking to gsm-7 encoding simplifies testing and compliance reviews, since the text renders uniformly across devices and regions. Brands that rely on crisp, concise language often benefit most, because GSM-7 encoding aligns well with plain-text messaging that feels professional, direct, and easy to read.

98%

of texts are read immediately

70%

of consumers want to text businesses

40%

of consumers said they have tried to text a business

GSM-7 Encoding Best Practices

Using GSM-7 encoding effectively starts with writing clean, plain text that suits a wide range of devices and networks.

Keep characters simple and predictable, favoring standard letters, numbers, and basic punctuation so the message renders consistently for every recipient.

When drafting templates, watch how special symbols, accented letters, or emoji can move the content to UCS-2, changing segment counts and delivery behavior without obvious warning.

Testing real examples with typical customer names, addresses, and reference codes helps you spot characters that might silently break GSM-7 encoding and shorten your available space.

Data accuracy is equally important, because information pulled from a CRM or other systems may contain unexpected symbols that affect billing and message flow.

Maintain a consistent tone that matches your brand while still respecting GSM-7 encoding limits, so every SMS feels professional, clear, and on-message.

Operationally, keep a shared style guide so teams write in a similar way, avoid risky characters, and produce copy that remains stable across different tools and integrations.

Everything You Need to Scale SMS

Read Our Blog

Woman reading an SMS on her phone

14 Promotional Message Examples to Capture Customers

Keeping in touch with customers is essential for any business looking to succeed. One of...

Read More
woman smiling and looking at her phone

Minimize Missed Appointments With an Appointment Reminder Text

No-shows and last-minute cancellations are major headaches for service-based businesses. Every missed appointment can mean...

Read More
woman texting

Text Message Marketing For Small Business: 5 Best...

One of small businesses’ biggest challenges is maintaining consistent and effective communication with their customers....

Read More

READ

OUR BLOG

Home service technician sending an SMS

10 Best SMS Marketing Platforms for Home Services (2026 Guide)

Explore the ten best SMS marketing platforms for home services available in 2026. Discover what makes Textellent stand out as the best option.
Read More
Woman reading an SMS

SMS Marketing Pricing Comparison to Stop Overpaying in 2026

Discover different pricing models of marketing platforms and explore our SMS marketing pricing comparison of the five most popular solutions.
Read More
twilio vs messagebird

Twilio vs MessageBird: What to Consider Before You Decide

Read our Twilio vs MessageBird review and find out how the two platforms compare. Discover what makes Textellent the superior alternative to both.
Read More

Everything You Need to Text at Scale

  • Textellent Messenger

    The Textellent Messenger is a Chrome extension that lets your team text inside the apps you already use—no code, no tab-switching. View full conversation history, reuse approved templates and media, and keep replies organized in a shared inbox.

    Learn More >

  • Integrate SMS

    Textellent integrates with 800+ apps—CRMs, schedulers, forms, and payment platforms—so data flows in and texts go out at the perfect moment. Map fields once, tag contacts consistently, and keep systems in sync.

    Learn More >

  • Automations

    Turn common events into automatic SMS touchpoints: new leads, appointments, payments, status changes, and more. Build simple, rules-based flows that send the right text and follow-ups without manual work.

    Learn More >

  • Franchisor Module

    The Franchisor Module gives franchisors clear visibility across locations while empowering franchisees to execute consistent, on-brand texting that drives growth. Scale what works and spot where support is needed—fast.

    Learn More >

  • AI Rewriter & Translate

    Instantly polish your texts and translate them into different languages, making communication faster and more accessible.

    Learn More >

  • Mobile App

    Keep conversations moving on the go. The Textellent Mobile app brings your shared inbox to iOS & Android with real-time push notifications, quick-reply templates and media, conversation assignment, and full sync to your CRM—so nothing slips through when you’re away from your desk.

    Learn More >

Get Started with Business Texting

Get a Demo
Start Free Trial

FAQs About GSM-7 Encoding

[sms_guides_faqs]

Want more conversions from text?

Enter your email, and we'll send tips, templates, and examples you can use immediately.