TLS Handshake Parser

Copy the hex code from a TLS handshake into the text area, and click the Parse button to see it decompiled below. You can get the hex code from, for instance, .

You can format the data as either a single string of hex-encoded bytes (ex. "160301...") or in the hexdump format that openssl -debug gives you. (ex. "0000 - 16 03 01 ...")

This code runs entirely in your browser. The content of the textarea isn't sent anywhere. Code is at https://github.com/peculater/tls-parser-wasm

Here's an example you can try.

Example of what text to copy out 

write to 0x55f5c8bcd5a0 [0x55f5c8be5ed0] (322 bytes => 322 (0x142))
0000 - 16 03 01 01 3d 01 00 01-39 03 03 a8 91 32 bc 9e   ....=...9....2..
0010 - 13 6b 9a 2b 34 38 b2 3e-82 8b f5 67 0f 80 fd 75   .k.+48.>...g...u
0020 - db 15 d8 f6 18 45 21 ef-db d5 72 20 9d 97 af 92   .....E!...r ....
0030 - 6d 8f 4d a9 6f 96 a6 7f-c7 29 f3 79 6b b2 f4 b7   m.M.o....).yk...
0040 - 9b 53 d4 10 cd 4f ce 81-4d f9 6b d9 00 48 13 02   .S...O..M.k..H..
0050 - 13 03 13 01 13 04 c0 2c-c0 30 cc a9 cc a8 c0 ad   .......,.0......
0060 - c0 2b c0 2f c0 ac c0 23-c0 27 c0 0a c0 14 c0 09   .+./...#.'......
0070 - c0 13 00 9d c0 9d 00 9c-c0 9c 00 3d 00 3c 00 35   ...........=.<.5
0080 - 00 2f 00 9f cc aa c0 9f-00 9e c0 9e 00 6b 00 67   ./...........k.g
0090 - 00 39 00 33 00 ff 01 00-00 a8 00 00 00 19 00 17   .9.3............
00a0 - 00 00 14 77 69 6c 6c 69-61 6d 6c 69 65 75 72 61   ...williamlieura
00b0 - 6e 63 65 2e 63 6f 6d 00-0b 00 04 03 00 01 02 00   nce.com.........
00c0 - 0a 00 0c 00 0a 00 1d 00-17 00 1e 00 19 00 18 00   ................
00d0 - 23 00 00 00 16 00 00 00-17 00 00 00 0d 00 26 00   #.............&.
00e0 - 24 04 03 05 03 06 03 08-07 08 08 08 09 08 0a 08   $...............
00f0 - 0b 08 04 08 05 08 06 04-01 05 01 06 01 03 03 03   ................
0100 - 01 02 03 02 01 00 2b 00-09 08 03 04 03 03 03 02   ......+.........
0110 - 03 01 00 2d 00 02 01 01-00 33 00 26 00 24 00 1d   ...-.....3.&.$..
0120 - 00 20 67 38 02 a0 17 6e-51 1a 3d 3e 7d 28 e9 c9   . g8...nQ.=>}(..
0130 - 70 31 6a 56 13 ba 4e fa-a1 40 98 93 5d 5a 66 b6   p1jV..N..@..]Zf.
0140 - ff 5b                                             .[