MAKE MESSAGING EASIER

Send smarter with SMS message optimization

With SMS Message Optimization, you can automatically format, encode, and schedule your SMS, so every customer gets a clear, complete message while you avoid extra work and unpredictable costs. It’s free to use alongside the Sinch Conversation API.

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Join over 190,000 businesses, including 8 of the 10 largest tech companies in the world

WHAT MAKES IT SPECIAL

SMS that just works, without extra code or hidden costs 

Unlock better SMS sending when you access SMS API through the Sinch Conversation API. SMS Message Optimization removes the guesswork of global SMS, so your team ships faster, and your customers always receive readable, on-time texts.

Crystal-clear delivery

Say goodbye to garbled characters and out-of-order parts, so every customer sees your message exactly as you wrote it. Plus, send globally on the ultra-reliable Sinch network.

Less code to manage

The API handles concatenation, encoding, and scheduling automatically, so developers can
focus on building.

Predictable SMS spending

Smart encoding detection picks the most cost-effective character set and shows part counts upfront, so there’s never any surprise charges.

DELIVER READABILITY

Keep every long or emoji-filled SMS perfectly legible

SMS Message Optimization adds hidden headers and manages character sets so multilingual texts, emojis, and multi-part messages arrive exactly as intended with no mojibake, no missing parts.

  • Sends up to 25 parts with the right reassembly

  • Supports 1.1 M+ Unicode characters

  • Works across global networks and handsets

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SIMPLIFY DEVELOPMENT

Shift SMS complexity from your codebase to our API

Stop writing custom logic for splits, headers, or time zone math. One API call is all it takes. The platform queues, segments, and delivers your message at just the right moment. For compliance-sensitive industries, Message Optimization supports delivery proof and time-based regulatory adherence through features like scheduling and validity periods.

  • Automatic concatenation and scheduling

  • Line-break and formatting support (\n)

  • Transparent segmentation feedback before send

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STOP OVERPAYING

Pay only for the parts you need, never for encoding mistakes

A single emoji can switch encoding and triple your bill. Our smart detection chooses GSM-7 or UCS-2 automatically and lets you preview costs before you hit send.

  • Prevents unnecessary Unicode charges

  • Validity periods stop outdated deliveries

  • All optimizations included at no extra fee

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REAL-WORLD USE CASES

Where SMS Message Optimization shines

International marketing

Send promotions in any language with emojis, knowing they’ll render correctly and arrive as one coherent message, no matter 
where you send it.

Detailed service alerts

Deliver long, multi-step instructions or updates as a single, readable message, ideal for technical support or complex notifications.

Time zone sensitive reminders

Schedule appointment reminders to land at the right local time, so you stay relevant and get higher response rates worldwide.

Time-limited offers

Set a validity period so flash-sale notifications never land after the deal ends, boosting conversion and customer trust.

BUILT-IN FEATURES

Everything you need, nothing extra to configure

Automatic concatenation

Splits long texts into up to 25 parts and adds UDH headers for perfect reassembly.

Intelligent encoding

Auto-detects GSM-7 or UCS-2 to balance character support with cost control.

Scheduled sending

Queue any message with the send_at parameter to hit inboxes at the ideal time.

Validity period

Make messages expire automatically to prevent outdated or irrelevant deliveries.

Line break support (\n)

Keeps your intended formatting so instructions and lists stay clear.

UDH management

Handles all header logic invisibly to deliver in the correct order on every device.

Transparent feedback

Preview segmentation and costs before sending for full billing predictability.

Platform optimization 

All improvements run server-side, so there’s zero additional developer effort.

Section FAQ

Frequently asked questions

It’s a built-in set of SMS API features that automatically manages formatting, encoding, timing, and concatenation, so messages are readable, in order, and cost-efficient.

You make a single API call. The platform chooses the right encoding, adds UDH headers, segments when needed, and can schedule delivery or set validity before dispatching.

This can happen when a text exceeds 160 characters or includes even one special character like an emoji. Encoding switches to Unicode with a 70-character limit, which causes segmentation.

Yes. The API inserts hidden UDH headers that tell the device how to reassemble multi-part messages correctly.

Include the send_at parameter in your API call with a UTC ISO 8601 timestamp. The platform handles the rest.

Use SMS Message Optimization to auto-detect GSM-7 vs. UCS-2 and preview segmentation before sending, helping you control costs.

No. All features are standard and free within the Sinch Conversation API. You pay only for the final number of message parts sent.

Up to 25 parts, with proper reassembly on supported devices.

Optimizations are automatic with no extra parameters, and reliable reassembly is supported across global networks, with transparent segmentation feedback before sending.

All you need is an active integration with the Sinch Conversation API—no additional setup or configuration needed.