Home / Free Tools
Free tools

Free SMS, WhatsApp & DLT Tools

Practical tools for anyone sending SMS or WhatsApp messages in India: compare channel costs, check DLT template format, and clean your mobile number lists. Everything runs in your browser; nothing is uploaded to our servers.

All tools

SMS Length Calculator

Check unicode SMS character count and credits used across English, Hindi, Tamil, Telugu, and other Indian languages.

Open tool

Generate SMS Link & QR Code

Create a click-to-text SMS link with a pre-filled message, plus a downloadable QR code to share on your website or in print.

Open tool

Generate WhatsApp Link & QR Code

Create a click-to-chat WhatsApp link with a pre-filled message, plus a downloadable QR code to share on your website or in print.

Open tool

DND Checker

Check whether a mobile number is registered on the NCPR/DND registry before sending a promotional SMS or making a promotional call.

Open tool

SMS vs WhatsApp vs Voice Cost Calculator

Compare estimated monthly cost and cost-per-lead across SMS, WhatsApp Business API and Voice calls based on your own volume and rates.

Open tool

DLT Template Format Validator

Check your SMS template against common DLT formatting rules, including the new mandatory variable tagging requirement, before submitting it for registration.

Open tool

Bulk Mobile Number Format Cleaner

Paste a list of Indian mobile numbers and get back a clean, deduplicated, validated list, ready to upload for sending.

Open tool

SMS Template Diff Tool

Compare two versions of a message template and catch changed variables, encoding changes, and segment or cost differences before you resend.

Open tool

DLT Sender ID / Header Checker

Check your transactional Sender ID against the 6-character alphabetic DLT format. Also explains why promotional numeric headers can't be self-checked.

Open tool

TRAI Sending-Window Checker

See whether promotional SMS can legally be sent right now under TRAI's 10 AM to 9 PM window, or check a scheduled send time.

Open tool

Bulk SMS Cost Optimizer

Paste a message and get concrete fixes, like removing emoji or smart quotes, that cut billable segments and lower cost.

Open tool

Why these tools are free

Comparing message costs, checking DLT template format, or cleaning a number list are things anyone sending SMS or WhatsApp in India needs to do regularly, regardless of which provider they use. We built these as free, no-signup tools that run entirely in your browser. Nothing you enter is uploaded, stored, or seen by us.

Testimonials

Why do Great Businesses Trust SMS Gateway Center?

K

Kurlon IT

2022-08-04

We have tied up with other SMS providers also, but SMS GatewayCenter is quite good. Good Service from the team. We are very happy with the service be it accounts related or technical issue. We always get good response.

I

INOX Air Products

2018-02-09

We have an excellent experience with SMS Gateway Center. The services and support has been of very high standard.

S

Shalabh Arora

2025-04-11

I’ve been using SMSGatewayCenter’s bulk SMS and WhatsApp services since early 2022 for my small business, and the experience has been fantastic. The platform is intuitive, and the message delivery is incredibly reliable, reaching my customers without fail. The 24/7 support team is quick to assist, and the cost-effectiveness is a big plus. It’s transformed how I connect with my audience, and I highly recommend it to other entrepreneurs! (Google Revirews)

R

Reflex

2025-04-11

We’ve been using your bulk SMS services for a few months, and the results have been phenomenal. The open rates and customer engagement have gone through the roof. Highly recommend for any business looking to scale fast! (Google Revirews)

V

Vedanth Gowda

2025-04-18

I’m Vedanth Gowda, leading a finance business, and I’ve been leveraging SMSGatewayCenter’s bulk SMS and WhatsApp tools —absolutely transformative! The platform’s speed and precision in delivering financial alerts to my clients are unmatched, giving me a competitive edge. Samrat’s expertise in tailoring notification workflows for market updates was a standout, and the robust security features instilled trust. The affordable pricing and proactive support team make it a no-brainer. Perfect for finance pros aiming to elevate client trust and efficiency! (Google Revirews)

N

Naval Bhatnagar

2025-04-12

From day one, the team at SMS GATEWAY CENTER guided us through setup, testing, and launching campaigns. Their support is A+. Whether you’re new to SMS marketing or experienced, they make it smooth. Thank you Aakash. (Google Revirews)

CTA for Need Something Custom?

Need Something Custom?

Talk to our team about SMS, WhatsApp and Voice solutions built around your workflow.

Get in touchSign up

Manage Your SMS Campaigns Anywhere

Track deliveries, send quick messages, and stay in control from your
iPhone, iPad, Android phones and tablets, or Mac.
Your SMS Gateway Center dashboard, now in your pocket.

Download on the
Play Store Download on the
App Store