Following my normal pattern, I’m playing Borderlands 2 on PC in 2019. Here are all the SHiFT codes I’ve found online that still work (updated 2019-03-29) that gives you golden keys (which give you purple loot!). I’ve removed the hyphens because copy/paste doesn’t work in the game itself with the hyphens.

Golden key codes:

This code from the BL3 announcement gives you 100 keys!!

C3W33RZ6ZJTFJ6CTTJ33RFHX5

BL3 announcement code that gives you 5 keys and Salvador’s Community Day Skin:

C35TBWS6STTXBRKTTTJTJJH6H

These 3 codes together give you 70 keys:

5BW3BF96CTKXJFKTB3B339BWZ
WBK3TBKW6TTXTRKJTTBTC6BS5
W3KJBH9CBWXRBRWJTBTJ9JRXK

These codes each give you from 1 to 10 keys:

5TWJ3S5C9TXX3RW3JTTTSTXRJ
5TKBTRCW936XT65BTBBTXJZCH
KBWJJWTXB9C59J6WFBTJTK6BJ
CTWTBJTBW5KFTTTJTB33JTBWB
5T5B3CWJSKKRTJTTTJJT9HW63
KJ5BTFBKSKKXJ3T3BTJTFJX5C
KTK3JJWT6XKB65T3JJ3JWHBRT
C3WBBW3BRR5J6WB3JJJJ35ZKZ
WTWJ3TSXZSFTJB33TTJJWBCT3
WTKJ39JXZ96TJJB33T3JFRJC6
WTCTJJ9CS9RJJ33T3J3BBT9XH
WJW3B5HBR65BXCT33TJ3WXT53
WBCJBB3HHZRJJJJJJT3B69XHK
WB5JJKX6HSXBJBTTBJJBXW3S3
W3KJJKJXHZ6JJBJ3TT3T33XBR
W3CTJBFTFRKJRK3JJT3JH6H36
W3CB3RXRXBTFBR5BBT3TF3KXS
W353B9FXZZRBJ3JBT3B3JK9KH
KT5T3HS6HZFBJT33TJT3ZC5KH
KJ53BRRRSZF3TJJTJTT3WBHT6
KBKJBS5FSZFTTTTTJJJBXC95X
KB5BJWCRZ96J33JBBJ3TXK96K
K3WTTTKRH9X3BJTBJTBTKXTSB
K3WJTBFBRWS5RTTTBBB39XWZ5
K3WBTZ95HZFTT3JBTTJBZFX63
K3K333W9JT6XJJTTB3JBHWZZF
K3CTTSF6XTB6JXKTBJBT9KZZJ
K3CB33JF99RJ3JBJJ3JJBT3RX
K35TJ6399HXTBBT33TJBZZ3BX
K353BTWSBXH5BR5J3T336XTCK
CTW33J5KZBX6TFCJ3BTBFJ33H
CTC3JKR9H5WTZ3TTJ3TB6SRRJ
CT5JBFSTFX5TF5T3JJTT6CF6T
CJWJJHR5Z96JT3JJ3TBT6TJ6K
CJW3JKHXZH63TTJT3J33R5HXK
CBWJ36HRZS6TJJ33BJBTWH3TZ
CBCJBK9WHH63JTJB3JJBHT533
CBCB3SW36XKJXW3TTT3JSFBSB
C3CTJXJ6HZFJTTJJBBBJ3WTJZ
C35JBR9WSHXBBJTJJ33BF3WFB
C35BJSRBF65TFKBBBTJTFSBZK
C353JKWK9T66JXCBTJJTKB596
5JWTTKHTSBS5TXCBB33JHCJ6K
5BWBTRX5ZHFJBJBJBTJTCRBWX
5BC33CRJRFWB6WB3TTTB655ZX
5B5TBXFBX6WBXWJJJ3TJ9RXZW
53K3TJZJX6WBXKBBBJJBSJH3K
535TJ3JC6XKJXCJBTBBTK5WFR
535T3JR6ZH6B3J33TJT3T9JBK
535JJXKRHSXJ3TT3JJT3FTSR6
WTC3BZ5ZWCHW6JTJJJBJ9FWXR
KBC3J95WXFWBSBTTTJJBKTC6K
KB53JRW5XX539BTBJT3JCC55T
WB5TTJFCXXCBS33TTTBJJJ95B
WBCTTXX3RKHK6TBTTTTTB5Z53
K3CBTCRKR6CB9BTT3TBJ595J3
CJKJBXWBR6WJXKJJB3TBWTCWX
CJ5B36TTFF5365TTBJBBSKTCB
CJ5T3K5TF65TRC3TBTJBHZ5ZF
CJC33RH3ZB9KTX53T3JJSXFRK
W3W3JFWSJXHCBXKTT33BXSS6B

Non-golden-key codes:

Class mods:

5JKBJK9WHWWBZTJT3TTBTW9HR (Axton Class Mod)
W3C3B5JRZCWJH33JBJJB9S6CJ (Gaige Class Mod)
CBWJ3S5CJ3WTTCFWX3339STBF (Zer0 Class Mod)
WJWJ3FXC33KT3CRKR33JJ9B35 (Maya Class Mod)
WTCJTJ653BC3TKF5X333F6JRH (Krieg Class Mod)
WJKBBKXC3J5BBCR5X33JXZ6RZ (Salvador Class Mod)

Tiny Tina’s Assault on Dragon Keep

KTK3JFR3JSZX55BB3BJ3HSRB6 (Axton’s Natural Twenty skin)
535BB3R3BZHF5K3JJB333BF3J (Gaige’s Summoner Sickness Skin)
CTKJ39CBJS9R5WTJBJ3TWKXKF (Zero’s The Pandora Chainmail Massacre skin)
CBCJ3W5TT9S65K3BJJ3BXHWWC (Maya’s Her Violent Nature skin)
CBKJ35FT39ZRCCTJTJB3RFJ5B (Krieg’s My Fantasies Involve Blood skin)
5J5TTRCJBSZXWCJTJ3BJTK3FB (Salvador’s Bear Naked skin)

Heads

KJKJTWHBKXHC9BTTJBJ3XJFSJ (Axton's Warrior of Light head)
CBKBJ6ZJW6HKH3TB3T33F5ZRS (Gaige's Wayfarer Wizard head)
CT5BBXTW5X9CSBT3BTTJFT5X5 (Zer0's G0ry Gh0ul head)
KTC3TWTW5FZCHB3BT3B3XJ9WR (Maya's Elven Eliminator head)
CBKBBZHJC6SWHJTJJ3BB3CXHS (Krieg's My Ears Are Ringing head)
WBCJJ33KWRS5Z33BJTTB65WJJ (Salvador's The Beast Within head)