CDN content distribution network, also known as, the principle is about the content distribution service to accelerate the whole network node, allowing users to access content from the nearest server node, thereby improving the access speed of the site. Most service providers (such as Ali cloud, Netease hive, Jingdong clouds, etc.) CDN service is a usage-based fee, there are some service providers offer free CDN service, simply summarize the CDN is currently available for free use on individuals web sites, free has been good enough.
1. Tencent cloud CDN 's official website: https://cloud.tencent.com/product/cdn
(score 9.0) Tencent cloud can request a free SSL certificate, Tencent cloud CDN can be a good support for SSL certificate, enabling https access, Tencent cloud CDN is not completely free, but the new registered users there are currently gift bag free traffic, and Tencent cloud 10G free gift every month accelerated flow,
2.360 Site Guard 's official website: http://wangzhan.360.com/
(score 8.5) free CDN service provider 360, unlimited data, CDN acceleration and basic security defenses relatively stable, free DNS service they provide also very stable. 360 Guardian website supports uploading SSL certificates, the site also offers free filing services. Please note that 360 guards and 360 cloud-accelerated web site (cdn.cloud.360.cn) are two different products, which mainly offer paid CDN service.
3. Baidu cloud acceleration official website: https://su.baidu.com/
(score 8.0) cloud acceleration into free and paid versions, free version does not support SSL certificates, the site also supports accelerated overseas. Baidu cloud acceleration claim to accelerate Baidu included, but the effect is not very obvious, accelerate cloud also provides free DNS service. Please note that Baidu Baidu cloud acceleration and cloud (cloud.baidu.com) and Baidu cloud disk (yun.baidu.com) are different products, not to be confused this name around dizzy.
4. shoot cloud CDN official website: https://www.upyun.com/products/cdn
(score 7.5) new registered users can get cloud they shoot free vouchers, they shoot the cloud as a user of the Union, within one year of each month free use of 10GB and 15GB storage space traffic, they shoot the cloud can also request a free SSL certificate realize https access.
5. Zhiyun accelerate FreeCDN official website: http://su.zhiduopc.com/
(Score 8.0) and Baidu cloud acceleration as both free and paid versions, but not the same as they support the Pan-domain name parsing + HTTPS / SSL certificate, unlimited traffic, providing free filing services, can be used at home and abroad. Free version also comes with defensive DDOS / CC 100Gbps DDOS DDOS domestic foreign peak peak 20Gbps, quite useful for personal web sites.
6. cloud Momen 's official website: https://www.cachemoment.com/
(score 7.0) free support SSL, Free 10GB of free traffic per month, 100,000 per month free of https requests, join the cloud Momen Union can enjoy free 50GB of monthly traffic per month and 500,000 free HTTPS requests, Momen also supports cloud acceleration overseas websites.
7. seven cattle cloud CDN official website: https://www.qiniu.com/products/fusion
(score 7.0) per month to free storage capacity of 10G and 10G traffic with a 100 CDN million times Get requests, seven cattle are also numerous overseas cloud node acceleration, seven cattle cloud TCP compression optimization enlarge the pages and style, and so realize seconds to load. Use seven cattle CDN, we must ensure that the accounts have a minimum amount of 10 yuan.
8.性能魔方CDN 官网：http://www.mmtrix.com/ispeed
（评分 7.5）性能魔方云加速提供国内外30个IDC和300+CDN节点网络加速，免费版前3个月免费使用百余个CDN节点和每月1000GB流量，之后每月可获得200GB的免费流量，此网站还免费提供网站云监测和WEB检测服务，值得体验。
9.VeryCloud云分发 官网：https://www.verycloud.cn/cloud/cdninfo
（评分 7.0）云端网络将用户的加速内容分发至部署在全球的近500个服务节点，每月免费赠送50G的CDN加速流量，稳定支撑大量图片、音频、视频等文件的访问。
云盾CDN 官网：https://www.yundun.com/
（评分 7.5）免费版的云盾不支持SSL，云盾的缓存功能很强大，它拥有遍布全球的加速节点和精细的性能优化能力，开启缓存后网站速度会有明显的提升，它拦截CC攻击的效果也很不错。
使用免费CDN的时候，偶尔会出现网站打不开的现象，出现的情况极少，但这也是难免的，免费的东西或多或少都会有一些不稳定的情况。
总之适合自己的才是最好的。