WITNESS by KATY PERRY has sold 515,978 copies in 11 countries. The album sold best in China (148,478 copies), Canada (80,000 copies) and Mexico (60,000 copies).
WITNESS certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Australia |
35,000 | 1x Gold |
Australia Sales: 35,000
Certification / note: 1x Gold
Certification Date / sales as of:
|
|
 Austria |
7,500 | 1x Gold | 3 October, 2017 |
Austria Sales: 7,500
Certification / note: 1x Gold
Certification Date / sales as of: 3 October, 2017
|
 Canada |
80,000 | 1x Platinum | 2017 |
Canada Sales: 80,000
Certification / note: 1x Platinum
Certification Date / sales as of: 2017
|
 China |
148,478 | Digital sales on QQ, NetEase, Kugou, Kuwo and Migu | 7 February, 2022 |
China Sales: 148,478
Certification / note: Digital sales on QQ, NetEase, Kugou, Kuwo and Migu
Certification Date / sales as of: 7 February, 2022
|
 Denmark |
10,000 | 1x Gold | 14 September, 2021 |
Denmark Sales: 10,000
Certification / note: 1x Gold
Certification Date / sales as of: 14 September, 2021
|
 France |
50,000 | 1x Gold | 24 November, 2017 |
France Sales: 50,000
Certification / note: 1x Gold
Certification Date / sales as of: 24 November, 2017
|
 Italy |
25,000 | 1x Gold | 2021 |
Italy Sales: 25,000
Certification / note: 1x Gold
Certification Date / sales as of: 2021
|
 Mexico |
60,000 | 1x Platinum | 28 April, 2018 |
Mexico Sales: 60,000
Certification / note: 1x Platinum
Certification Date / sales as of: 28 April, 2018
|
 Netherlands |
20,000 | 1x Gold | 2018 |
Netherlands Sales: 20,000
Certification / note: 1x Gold
Certification Date / sales as of: 2018
|
 Norway |
20,000 | 1x Platinum | 29 October, 2020 |
Norway Sales: 20,000
Certification / note: 1x Platinum
Certification Date / sales as of: 29 October, 2020
|
 United Kingdom |
60,000 | 1x Silver | 16 February,2018 |
United Kingdom Sales: 60,000
Certification / note: 1x Silver
Certification Date / sales as of: 16 February,2018
|
| Total sales | 515,978 | (in 11 countries) |
Total
Sales: 515,978
(in 11 countries)
|
Year-end chart performance for WITNESS
| Chart 2017 | Rank | Sales |
| Australian Albums (ARIA) |
35 | >35,000 |
 Belgian Albums (Ultratop Flanders) |
107 | |
| Belgian Albums (Ultratop Wallonia) |
93 | |
| Canadian Albums (Billboard) |
39 | |
| Dutch Albums (Album Top 100) |
93 | |
| French Albums (SNEP) |
85 | |
| Italian Albums (FIMI) |
92 | |
| Mexican Albums (Top 100 Mexico) |
50 | |
| Norwegian Albums (IFPI Norway) |
72 | |
 US Albums (Billboard 200) |
91 | |
 Worldwide Albums (IFPI Global Music Report) |
15 | 800,000 |