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sms qr code messaging mobile marketing

SMS QR Code: URI Format, Pre-Fill, and Delivery Guide

smsto vs sms URI formats, iOS and Android message handling, pre-fill best practices, short codes vs long codes, and MMS limitations.

By Tools Hub Editorial Team·Published March 3, 2026·Time to read: 8 min

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SMS QR Generator

Create an SMS QR code with pre-filled phone number and message.

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smsto: vs sms: URI Formats

Two URI schemes exist for SMS QR codes:

•`smsto:` -- smsto:+12125551234:Hello -- widely supported on both iOS and Android. The format is smsto:NUMBER:BODY.

•`sms:` -- sms:+12125551234?body=Hello -- the RFC 5724 standard. Uses query parameter syntax for the body.

SMS QR Generator uses smsto: because it has broader device compatibility, especially on older Android phones. The sms: format with ?body= works on newer devices but occasionally fails on Android versions below 10.

iOS vs Android Handling

•iOS: Both sms: and smsto: open the Messages app. The body is pre-filled correctly. iMessage or SMS is chosen automatically based on the recipient.

•Android: smsto: opens the default messaging app (Google Messages, Samsung Messages, etc.). The body pre-fill works reliably. Some third-party messaging apps may ignore the body parameter.

Always test on the actual device your audience is most likely to use.

Pre-Filled Message Body

The body text appears in the message field when the user opens the app. Best practices:

•Keep it under 50 characters for a compact QR code.

•Use plain ASCII characters. Avoid emojis, accented characters, and Cyrillic in the body -- they increase QR density and may not URL-encode correctly across all devices.

•Start with a keyword for easy server-side routing: JOIN, STOP, ORDER 12345.

Short Codes vs Long Codes

•Short codes (5-6 digits, e.g., 55555): used for high-volume marketing. Expensive to lease ($500-1000/month in the US). Higher deliverability.

•Long codes (full phone numbers, e.g., +12125551234): cheaper, good for low-volume and conversational SMS. Standard phone rates apply.

For most small businesses, a regular phone number works fine. Short codes are for large-scale campaigns with thousands of opt-ins.

Testing Message Delivery

1.Generate the QR in SMS QR Generator.

2.Scan with iPhone -- verify the Messages app opens with correct number and body.

3.Scan with Android -- verify the same.

4.Actually send the message and confirm it arrives at the destination number.

5.If using a keyword-based system, verify the auto-reply triggers correctly.

MMS Considerations

Standard SMS QR codes do not support attachments or images (MMS). If you need the user to send a photo (damage report, receipt scan), direct them to a web upload form via a URL QR instead.