What is #a4 used for?

#a4 is a popular hashtag used on Instagram, TikTok, YouTube, and LinkedIn to categorize content. It has 18 related hashtags. The best hashtags to pair with #a4 are: #b6, #s4, #b5, #a3, #a5.

What are the best hashtags to use with #a4?

Based on analysis of 133 posts, the top hashtags to combine with #a4 are: #b6, #s4, #b5, #a3, #a5. These have high relevance scores averaging 13% and are used by 84% of top-performing posts.

How many hashtags should I use with #a4?

For Instagram, use 20-30 hashtags including #a4. For TikTok, use 3-5 hashtags. For YouTube, use 3-5 in description. For LinkedIn, keep it to 3-5 professional hashtags. Studies show this can increase engagement by +49%.

How do I use #a4 on Instagram?

On Instagram, add #a4 in your caption or first comment with 20-30 related hashtags. Best tags to combine: #b6, #s4, #b5. Use in Stories and Reels for extra discovery.

Does #a4 work on TikTok?

Yes! Use #a4 with 3-4 related hashtags like #b6 and #s4. Posts using #a4 see 2.5x more reach on average. TikTok prioritizes content quality, so pair with trending sounds.

Can I use #a4 on YouTube?

Yes, add #a4 to your video title — first 3 hashtags appear above the title. Include related tags like #b6, #s4 in your description. Works great for YouTube Shorts.

Is #a4 still popular in 2026?

Yes! #a4 remains highly popular in 2026 with 18 related hashtags and 133+ posts analyzed. 84% of top-performing posts in this niche use #a4 or related tags.

What hashtags are similar to #a4?

Similar hashtags to #a4 include: #b6, #s4, #b5, #a3, #a5, #audirs5, #rs4, #audia4. These share 13% average relevance and can increase reach by 2.5x when used together.