Free social media tools for posts that fit everywhere
Count, cut, split, clean and resize a post the way each network does it, check its hashtags, catch the phrases that make it sound like AI, and see when your posts do best. Every rule comes with its source, and it all runs in your browser.
Runs in your browser. Your text and images never leave it.
Updated
Text
Counted the way each network counts: links, emoji, accents and all.
- Text tool
Character counter
Count one draft for Threads, X, Bluesky, Mastodon and LinkedIn at once, and cut it to fit.
Open it - Text tool
Thread maker
Turn long text into a thread for X, Threads, Bluesky or Mastodon, split where paragraphs and sentences end, with links kept whole.
Open it - Text tool
Character limits, every network
Every limit for the five networks: what counts as a character, what a link costs, the source and the day we checked.
Open it - Text tool
Invisible character remover
Find the zero-width spaces, stray joiners and styled letters hiding in a draft, see where each one sits and what it costs on each network, and take them out without breaking an emoji.
Open it - Text tool
Hashtag checker
See which #words become tag links on Threads, X, Bluesky, Mastodon and LinkedIn, which stay plain text, and why.
Open it
By network
- Threads character counterThreads' 500, counted the way the app counts, with the stricter count Meta's API docs use for emoji alongside.
- X character counterX's weighted count: any link is 23, emoji and CJK characters are 2. Premium's 25,000 too.
- Bluesky character counterBluesky's 300 graphemes and 3,000 bytes, measured after the app shortens your links.
- Mastodon character counterYour server's own limit, with the content warning counted, links at 23 and remote mentions at their short form.
- LinkedIn character counterLinkedIn's 3,000, and roughly where the “see more” fold cuts your opening.
Images
The sizes and file caps each network takes, a resizer that meets them, and makers for carousels, quote cards and banners.
- Image tool
Image resizer
Crop, pad and compress an image for any network and placement, right in your browser.
Open it - Image tool
Carousel maker
Turn a long post, a thread or a list into a carousel: a cover, a slide per point and a closing slide, for Instagram, TikTok, LinkedIn or Facebook.
Open it - Image tool
Quote card maker
Turn a post, a tweet or a quote into one image on a gradient or solid background, in square, portrait, landscape or story size, saved as a PNG.
Open it - Image tool
Profile banner maker
Make a header for X, LinkedIn, Bluesky or Mastodon, and see where your photo, name and buttons cover it on a computer and a phone.
Open it - Image tool
Alt text counter
Check one image description against the alt text limit on Threads, X, Bluesky, Mastodon and LinkedIn, counted the way each one counts.
Open it - Image tool
Instagram image sizes
The 1,080 px width Instagram keeps, the shapes it shows whole, carousels and stories, with a resizer set for Instagram.
Open it - Image tool
Facebook image sizes
Facebook's sizes for the cover photo, profile picture, feed photos, link previews and stories, with a resizer set for Facebook.
Open it - Image tool
TikTok image sizes
Photo posts of up to 35 photos, their 20 MB cap and alt text, and the profile photo, with a resizer set for TikTok.
Open it
By network
- Threads image sizesThe width Threads keeps, its 8 MB cap, formats and carousels, with a resizer set for Threads.
- X image sizesWhat X takes for each placement, how the feed crops it and the file caps, with a resizer set for X.
- Bluesky image sizesHow Bluesky crops one to ten images, its 2 MB cap, avatars and banners, with a resizer set for Bluesky.
- Mastodon image sizesWhat Mastodon takes for each placement, how it crops and the file caps, with a resizer set for Mastodon.
- LinkedIn image sizesLinkedIn's sizes for posts, your profile, Pages and link previews, with a resizer set for LinkedIn.
Timing
When your posts do best, read from your own public posts, not someone else's averages.
Writing
A second read before you post: the habits that make a draft sound like everyone else's, with sources.
About these tools
Are these tools free?
Yes, all of them. There's no account to make and no limit on how often you use them.
Do you see what I type or upload?
No. Everything runs in your browser and nothing you type or upload is sent anywhere. There are two lookups, and neither goes through us. The Mastodon counter sends a server's name, and only that, straight to that server, to ask for its limit. The Bluesky best time tool sends a handle straight to Bluesky's public API, to read that account's public posts.
Why do these counts differ from other counters?
Most counters count every character as one. The networks don't. X charges 23 for any link and 2 for most emoji, Bluesky counts graphemes after shortening links, and a Mastodon limit depends on the server. These tools follow each network's own rules, and every page links to where those rules come from.
How do you keep the limits current?
Each rule is stored with its source and the day we last checked it, and every page shows both. When a network changes a limit, we change it in one place and every tool follows.
Can Shaflex do all of this inside the app?
Most of it. Shaflex is a social media scheduler, and in the app you write one draft and it makes a copy for each of Threads, X, Bluesky, Mastodon and LinkedIn: sized to that network's limit, split into a thread where it runs long and checked against its media rules. Then the copies are scheduled together. These tools are for a single post, or for checking a rule. The carousel, quote card and banner makers make images the app doesn't: Shaflex posts the images you attach, but it doesn't make them.
Write the next post once.
Shaflex fits it to Threads, X, Bluesky, Mastodon and LinkedIn, schedules it on your rhythm and brings the replies back to you.
Free plan, no card needed.