Free social media tools and calculators
Count characters the way X does before it cuts you off at 280. Work out an engagement rate with the same formula as Rival IQ's benchmark report, or estimate a YouTube channel's earnings from its views and RPM. Every tool runs in your browser with no sign-up, and each platform figure links to the page it comes from.
34 tools. All client-side.
Engagement and growth
Divide interactions by followers, reach or views, and track follower growth.
Engagement rate and follower growth calculator
Get engagement rate by followers, reach, impressions or views, compare it with Rival IQ's 2026 medians, and work out follower growth between two counts.
LinkedIn post engagement rate calculator
Calculate the engagement rate of a LinkedIn post from reactions, comments, reposts and impressions or followers. Free, in your browser, no sign-up.
YouTube engagement rate calculator
Calculate YouTube engagement rate by views or by subscribers, and compare it with the 0.21% median in Rival IQ's 2026 benchmark report.
Instagram engagement rate calculator
Work out your Instagram engagement rate by followers or by reach, then compare it with the 0.30% median in Rival IQ's 2026 benchmark report.
Character counters and text
Live counts against each platform's published limit, including how X counts emoji and links, plus bold and italic text with a screen reader note.
LinkedIn post character counter
Count your LinkedIn post against the 3,000-character limit and see how much room is left. Writing something longer? Articles allow 125,000.
Bold and italic text generator
Turn text into bold or italic Unicode letters to paste into LinkedIn, X or Instagram. Read the screen reader note before you use them.
X (Twitter) character counter and post preview
Count characters the way X does, with emoji as 2 and links as 23 against the 280 limit, then preview your post before you publish it.
LinkedIn post text formatter
Turn words for a LinkedIn post into Unicode bold or italic, count them against the 3,000-character limit, and copy them into your post.
Instagram caption character counter
Check an Instagram caption against the 2,200-character limit and the 5-hashtag cap from Instagram Help. Counts update as you type.
Image sizes
Pixel sizes and aspect ratios from platform help pages, a checker for your file, a grid maker and a post preview.
YouTube thumbnail size checker
YouTube recommends 3840 x 2160 thumbnails for videos and 2160 x 3840 for Shorts. Drop in your image to check its size, ratio and file weight.
LinkedIn image sizes for profiles and posts
Profile photo, cover image and post image sizes for LinkedIn profiles, taken from LinkedIn Help. Drop in an image to check that it fits.
YouTube banner size checker
YouTube Help recommends a 2560 x 1440 banner, at least 2048 x 1152, with text inside a 1235 x 338 safe area. Check your banner before you upload.
TikTok video size checker
Check a video's size, format, length and file size against TikTok's posting API docs: 360 to 4096 pixels per side, MP4, WebM or MOV, up to 4 GB.
Instagram story size checker
Meta recommends 9:16 for Instagram story images, as a JPEG up to 8 MB. Drop in an image to read its size and ratio before you post.
Facebook cover photo and profile picture sizes
Facebook Help lists an 851 x 315 Page cover and a 320 x 320 profile picture. Drop in an image to check its size and shape against both.
LinkedIn banner (cover image) size checker
LinkedIn Help recommends a 1584 x 396 cover image as a JPG or PNG under 8 MB. Drop in your banner to check its shape and file size.
X (Twitter) header and image size checker
X Help recommends a 1500 x 500 header and a 400 x 400 profile photo under 2 MB. Check your header, profile photo and post images in one place.
Instagram grid maker
Split one image into 3, 6 or 9 tiles for your Instagram profile grid, numbered in posting order. It runs in your browser and nothing is uploaded.
Instagram image sizes and aspect ratios
Instagram Help keeps photos 320 to 1080 pixels wide at full resolution between 1.91:1 and 3:4. Drop in an image to check its width and shape.
Aspect ratio calculator
Enter a ratio and one side to get the other, or reduce any width and height to a ratio. Presets use sizes from YouTube, LinkedIn, X and Facebook Help.
Instagram post preview
Mock up an Instagram feed post with your image and caption. Check the crop against the 1.91:1 to 3:4 range and your hashtags against the limit of 5.
Social media image sizes
Image and video sizes for YouTube, LinkedIn, X, Instagram, Facebook and TikTok, each from the platform's own help or developer docs, checked Oct 2026.
Planning
A calendar generator, a posting frequency planner and a holiday calendar built from OPM and UN dates.
Social media calendar generator
Pick a start date and posts per week, then download four weeks of Monday, Wednesday and Friday posting slots as a CSV or an .ics calendar file.
How often to post: a posting frequency planner
Turn posts per week into posts per month and back. Compare with Rival IQ's 2026 medians: 3.69 a week on Instagram and 1.98 on TikTok.
Social media holiday calendar
US federal holidays from OPM and international days from the United Nations list, dated for 2027. Tick the ones you want and download an .ics file.
Best time to post
Day and hour windows from Sprout Social's 2026 study of nearly 2 billion engagements.
Best time to post on LinkedIn
Tuesday 11 a.m. to 5 p.m. is the longest LinkedIn window in Sprout Social's 2026 data. See every window in your time zone and plan your week.
Best time to post on TikTok
Sprout Social's 2026 data shows TikTok's best times on Tuesday to Thursday afternoons, with Wednesday open 1 to 8 p.m. See them in your time zone.
Best time to post on Instagram
Instagram's best windows in Sprout Social's 2026 data run Tuesday 1 to 7 p.m. and Wednesday noon to 9 p.m. See them in your own time zone.
Best time to post on Facebook
Facebook's best times in Sprout Social's 2026 data are Tuesday and Wednesday, noon to 8 p.m. See every window in your own time zone.
Best time to post on X (Twitter)
Sprout Social's 2026 data puts the best time to post on X at Tuesday to Thursday, noon to 6 p.m. See those hours in your own time zone.
Ad and earnings math
CPM and CTR, social media management pricing, and YouTube earnings from your own RPM.
CPM and CTR calculator
Solve for CPM, total cost or impressions, then get click-through rate and cost per click from your clicks. Every formula is shown on the page.
Social media management pricing calculator
Price social media management from your own hourly rate, hours per client and client count. No preset rates. Get a monthly quote per client and in total.
YouTube money calculator
Estimate YouTube ad earnings from your views and RPM, and read the Partner Program revenue shares from YouTube Help.
UTM builder
Tag links with the parameters Google Analytics reads.
FAQ
- Are these tools free?
- Yes. They run in your browser and don't need an account.
- Where do the numbers come from?
- Pages that quote a platform figure list the source and the date we checked it. Platform help pages come first, then named industry reports. Calculators that only use your own numbers list no sources.
- Do you store what I type?
- No. The calculators run on your device.
- What is UniPost?
- UniPost connects Claude, Cursor, Grok Bot or any MCP client to your LinkedIn profile, X and YouTube, so your agent can schedule posts. Your first 2 accounts are free.
Optional next step
Post to LinkedIn, X or YouTube from your AI agent
UniPost connects Claude, Cursor, Grok Bot or any MCP client to your LinkedIn profile, X and YouTube, so you can schedule posts from a chat. Your first 2 accounts are free.