Changelog

April 15, 2026

• 0x-prefixed Hex Input: You can now paste PDU hex strings with 0x prefixes and spaces, like 0x000000AF 0x00000004 0x00000000 0x000066E4. The decoder will strip the prefixes and whitespace automatically.

December 18, 2025

• Message ID Display for Response PDUs: The submit_sm_resp now proudly displays its Message ID in a dedicated "Response Data" section. No more wondering what ID the SMSC assigned to your message!
• Changelog Page: You're looking at it! Now you can keep track of all the improvements we make to the decoder.

November 17, 2025

• Delivery Receipt Parsing: We taught the decoder to read delivery receipts! Now it can parse all those cryptic id:xxx sub:001 dlvrd:001 submit date:... strings and display them in a beautiful, structured format.
• Hex/ASCII Column Separation: The hex dump now lets you select hex bytes and ASCII characters independently. Finally, you can copy just the hex without getting a face full of dots and question marks!
• TLV Support for deliver_sm: Fixed delivery receipt parsing for PDUs with optional TLV parameters. Because why would the SMSC make things simple?

November 1, 2025 - First Release!

And lo, from the primordial soup of hexadecimal strings, a decoder was born! After countless cups of coffee and even more PDU parsing errors, we're thrilled to release the first version of SMPP PDU Decoder.

• Core Decoder Engine: Built from scratch with love, TypeScript, and an unhealthy obsession with the SMPP 3.4 specification.
• Full PDU Support: Decode bind_*, submit_sm,deliver_sm, enquire_link, query_sm, and all their response friends.
• TLV Parsing: Over 50 optional parameter tags recognized and decoded. We even know what sar_msg_ref_num means!
• Multi-Encoding Support: GSM-7, GSM-8, Latin-1, ASCII, and UCS-2. Because the world speaks many languages, and so do SMSCs.
• UDH Parsing: Concatenated messages, port addressing, and all those fancy User Data Header elements? We've got you covered.
• Beautiful PDU Breakdown: Visual representation of every byte in your PDU, color-coded and tooltipped for your debugging pleasure.
• 100% Client-Side: Your PDUs never leave your browser. What happens in the decoder stays in the decoder. Vegas would be proud.
• Example PDU Library: A curated collection of PDUs for testing and learning. Like a petting zoo, but for protocol buffers.