{{Cleanup section|reason=reliable and independent English sources are hard to find|date=December 2021}}
The proprietary image format WXAM (or wxHEPC) developed by [[Tencent]] (used within, e.g., [[WeChat]]) is apparently based upon HEVC,<ref name="51cto">{{cite web|url=https://blog.51cto.com/u_13591395/2066880|date=2018-01-30|author=Tencent Technology|title=如何节省1Tb图片带宽？解密极致图像压缩！_腾讯技术工程的技术博客_51Cto博客|trans-title=How do we save 1TB on image bandwidth? Declassifying our extreme image compression! |publisher=51CTO}}</ref>, as is SharpP, which was developed by their SNG (Social Network Group) division.<ref name="SharpP">{{cite web|url=https://cloud.tencent.com/developer/article/1004404|date=2017-06-30|title=图片流量节省大杀器：基于 CDN 的 sharpP 自适应图片技术实践 - 腾讯云开发者社区-腾讯云|trans-title=Image bandwidth-saving weapon: Practical CDN-deployed self-adapting sharpP images }}{{cite web|url=https://cloud.tencent.com/developer/article/1555426|date=2019-12-17|title=秒开率达90%：腾讯看点客户端 Gif 转视频优化方案 - 腾讯云开发者社区-腾讯云|trans-title=Instant load in 90% of cases: Tencent Kandian GIF-to-video solution }}</ref><ref name="SharpP-Is-TPG">{{cite web|url=https://cloud.tencent.com/developer/article/1029772|date=2017-12-27|title=腾讯社交网络图片带宽优化技术演进之路 - 腾讯云开发者社区-腾讯云|trans-title=Timeline for Tencent's optimization of social network image delivery |quote=SharpP工具从17年3月开始，已采用AVS2作为新的内核；17年5月正式对外推出基于AVS2的图片格式，联合北大、AVS组织一起完善相关规范，并命名为TPG（Tiny Portable Graphics）|trans-quote=Since March 2017, SharpP uses AVS2 as its new core. In May 2017, [we] made the new AVS2-based format public, completing the standard with Peking University and AVS the organization, and named it TPG (Tiny Portable Graphics)}}</ref> However, their container format may not be HEIF-compatible. In March 2017, SharpP switched to [[AVS2]]<ref name="TPGavs2">{{cite web|url=https://cloud.tencent.com/developer/article/1871646|date=2018-02-01|trans-title=Avs2-based image container: TPG: current situation and roadmap for improvement (Interview with Tencent's Audio-Video Lab)|title=基于Avs2的图片容器——TPG：现状与改进之路 - 腾讯云开发者社区-腾讯云 }}</ref> and was renamed TPG (''Tiny Portable Graphics'').<ref name="SharpP-Is-TPG"/><ref name=TPG>{{cite web|url=https://cloud.tencent.com/developer/article/1005004|date=2017-05-10|title=超越 Google，腾讯推出自研图片编码格式 TPG - 腾讯云开发者社区-腾讯云|trans-title=Ahead of Google: Tencent introduces independent image codec TPG }}</ref>
