We spend a lot of time talking to social media managers, creators, and small business owners. One thing that keeps coming up is how many small tasks eat into their day. Checking if a username is available across platforms, resizing an image for the fifth time because every platform has different dimensions, trying to figure out what time to post — none of these are hard problems, but they add up.
So we built 12 free tools and put them all in one place. No signup, no email required, no catch. Just open them and use them.
Here is what we made and why each one exists.
1. Username Availability Checker
You have probably been there. You come up with the perfect handle, check Instagram — taken. Check TikTok — available. Check Twitter — taken. Check YouTube — available. By the time you have manually checked eight platforms you have wasted fifteen minutes.
Our username checker checks Instagram, TikTok, Twitter/X, YouTube, Reddit, GitHub, Pinterest, and Twitch all at once. Type your name, hit check, and get results in seconds. Green means available, red means taken with a link to the existing profile.
Consistency across platforms matters more than people think. When someone discovers you on TikTok and wants to find you on Instagram, they are going to search the same handle. If it is different on every platform, you are losing followers.
2. Engagement Rate Calculator
Follower count is vanity. Engagement rate is sanity. But calculating it properly means pulling up your analytics, doing math, and then wondering if your number is actually good or not.
Our engagement calculator does the maths for you and tells you where you stand. Pick your platform, enter your followers, average likes, comments, and shares — and get your engagement rate with a rating. We include industry benchmarks for each platform so you can see if you are above or below average.
Instagram average engagement rate is about 1.5%. TikTok averages around 4%. If you do not know these numbers, you do not know if your content strategy is working.
3. Hashtag Generator
Most people either use the same hashtags on every post or spend twenty minutes researching new ones. Both approaches are wrong.
The hashtag generator takes your niche or topic and generates hashtags grouped by competition level — high, medium, and low. The strategy is to use a mix of all three: high competition hashtags for reach, medium for relevance, and low competition for discoverability.
It supports Instagram (30 hashtags), TikTok (7), Twitter (4), and LinkedIn (7) — giving you the right count for each platform. One click copies them all.
4. Best Time to Post
"When should I post?" is the most common question in social media marketing. The answer depends on your platform, your audience, and your timezone.
Our best time to post tool shows a visual heatmap of engagement levels across every hour and day of the week. Pick your platform and timezone, and you get a colour-coded grid showing exactly when your audience is most likely to see and engage with your content.
The data is based on aggregated engagement patterns across millions of accounts. It is not a guarantee, but it is a much better starting point than guessing.
5. Social Media Post Preview
You write a caption, post it, and then realise it looks completely different on the actual platform. Line breaks are wrong, it is too long, the formatting is off.
The post preview tool lets you type your caption and see exactly how it will render on Instagram, Twitter/X, Facebook, LinkedIn, and TikTok. Each platform has its own character limit and formatting rules — this tool shows you all of that before you hit publish.
6. Caption Writer
Staring at a blank text box is the worst part of posting. You know what you want to say but the words are not coming out right.
Our caption writer generates four caption variations based on your topic, platform, tone, and preferred length. Each caption comes with suggested hashtags and a call-to-action. Pick the one closest to what you want, tweak it, and post.
It is not AI-generated — it uses a template system designed by social media marketers. The output is a starting point, not a finished product.
7. Bio Generator
Your bio is the most important 150 characters on your profile. It is the first thing people read when deciding whether to follow you, and most people write it once and never think about it again.
The bio generator creates five bio variations based on your platform, niche, and preferred tone. It shows you the character count, whether you are within the platform limit, and how many emojis you are using.
We support 24 different niches — from fitness coach to real estate agent to tech startup — and five tones including professional, casual, funny, inspirational, and bold.
8. Image Resizer
Every platform has different image dimensions. Instagram posts are 1080x1080. Stories are 1080x1920. YouTube thumbnails are 1280x720. Twitter headers are 1500x500. If you are managing multiple platforms, you are resizing the same image five times.
The image resizer has 13 presets for every major platform and format. Upload your image, pick a preset, choose how to fit it (crop, pad, or stretch), and download. Everything happens in your browser — we do not upload your images anywhere.
9. QR Code Generator
QR codes are having a moment. They are on business cards, restaurant menus, product packaging, event flyers — everywhere. But most QR code generators either watermark the output or require an account.
Our QR code generator lets you create custom QR codes with your brand colours, choose the size, and even upload your logo to place in the centre. Download as PNG, no watermark, no signup.
10. UTM Link Builder
If you are running campaigns across multiple channels and not using UTM parameters, you have no idea what is actually driving traffic. But building UTM links manually is tedious and error-prone.
The UTM builder gives you a form with all five UTM parameters, quick-select chips for common values, and a live preview of your link. One click copies it to your clipboard, and your last five links are saved in your browser so you can reuse them.
11. ROI Calculator
"Is social media actually making us money?" If you cannot answer that question, this tool is for you.
The ROI calculator takes your ad spend, followers gained, average order value, and conversion rate — and shows you your cost per follower, cost per customer, estimated revenue, and ROI percentage. There is a "what if" slider so you can see how improving your conversion rate changes the numbers.
It is a simple model but it gives you a framework for thinking about social media as an investment rather than an expense.
12. Profile Audit Checklist
When was the last time you actually reviewed your social media profile from top to bottom? Most people set up their profile once and never look at it again, even though platforms add new features constantly.
The profile audit gives you a platform-specific checklist of 15-20 items to review. Each item is rated by priority — essential, important, or nice to have. Your progress saves automatically so you can come back and finish later.
It covers everything from the obvious (do you have a profile picture?) to the often-missed (are you using alt text on images? do you have story highlights named properly?).
Why We Built These
Honestly, we built these because we use tools like these every day and got tired of bouncing between different websites, many of which are ad-infested or require signups for basic functionality.
All 12 tools are at socialbooster.io/tools. No account needed, no email capture, no limits. If you find them useful, great. If you want to take your social media growth further, that is what our main platform is for — but the tools are genuinely free with no strings attached.