A a point in time  in our blogging journey
for all those using WordPress CMS
we need all footer and header plugin
if we want  to inject custom code
into  into our WordPress website so
I have made a list of WordPress
Free WordPress header and footer plugin

1. HEADER AND FOOTER CODE MANAGER.

Header Footer Code Manager
Header Footer Code Manager by 99 Robots is an easy interface to add snippets to the header or footer or above or below the content of your page.

BENEFITS

1. Never have to worry about inadvertently breaking your site by adding code
2. Avoid inadvertently placing snippets in the wrong place
3. Eliminate the need for a dozen or more silly plugins just to add a small code snippet – Less plugins is always better!
4. Never lose your code snippets when switching or changing themes.
5. Know exactly which snippets are loading on your site, where they display, and who added them

FEATURES

• Add an unlimited number of scripts and styles anywhere and on any post/page
• Manage which posts or pages the script loads
• Supports custom post types
• Supports ability to load only on a specific post or page, or latest posts
• Control where exactly on the page the script is loaded – head, footer, before content, or after content
• Script can load only on desktops or mobile. Enable or disable one or the other.
• Use shortcodes to manually place the code anywhere
• Label every snippet for easy reference
• Plugin logs which user added and last edited the snippet, and when

PAGE DISPLAY OPTIONS

1. Site wide on every post/page
2. Specific post
3. Specific page
4. Specific category
5. Specific tag
6. Specific custom post type
7. Latest posts only (you choose how many)
8. Manually place using shortcodes

INJECTION LOCATIONS

1. Head section
   A popular option for Google Adsense.
2. Footer
3. Top of content
4. Bottom of content

DEVICE OPTIONS

• Show on All Devices
• Only Desktop
• Only Mobile Devices

SUPPORTED SERVICES

1. Google Analytics
2. Google Adsense
3. Google Tag Manager
4. Clicky Web Analytics or other analytics tracking scripts
5. Chat modules such as Olark, Drip, or
6. Pinterest site verification
7. Facebook Pixels, Facebook Scripts, Facebook og:image Tag
8. Google Conversion Pixels
9. Twitter
10. Heatmaps from Crazy Egg, notification bars Hello Bar, etc.
11. It can accept ANY code snippet (HTML / Javascript / CSS) from any service

2.WOOD CODE SNIPPET

Use of  this plugin

• Insert Headers and Footers
• Insert Google AdSense Ads, Amazon Native Shopping Contextual Ads, Yandex Direct Ads, and Media.net on your website.
• Insert Google Analytic Tracking code, Yandex Metrika Tracking Code, Yandex Counter to Header, Footer.
• Insert PHP Code Snippets and execute on your website. Register PHP functions, classes, and global variables everywhere.
• Insert Social media widgets, add any external resources widgets.
• Insert Facebook Pixels, Facebook Scripts, Facebook og:image Tag, Google Conversion Pixels, Vk Pixels.
• Show or hide code snippets based on conditional logic.
• You can save templates of posts or page builders, quotes, and galleries to re-use them on your website.

Roll back changes with Code Revisions.

3.HEADER FOOTER CODE MANAGER.

• Eliminate the need for a dozen or more silly plugins just to add a small code snippet – Fewer plugins is always better!
• Never lose your code snippets when switching or changing themes
• Know exactly which snippets are loading on your site, where they display, and who added them

FEATURES

1. Add an unlimited number of scripts and styles anywhere and on any post / page
2. Manage which posts or pages the script loads
3. Supports custom post types
4. Supports ability to load only on a specific post or page, or latest posts
5. Control where exactly on the page the script is loaded – head, footer, before content, or after content
6. Script can load only on desktops or mobile. Enable or disable one or the other.
7. Use shortcodes to manually place the code anywhere
8. Label every snippet for easy reference
9. Plugin logs which user added and last edited the snippet, and when

PAGE DISPLAY OPTIONS

1. Site wide on every post / page
2. Specific post
3. Specific page