Hashtag sets
Save the hashtag blocks you reuse, name them, and rotate between them instead of pasting the same twenty tags every time.
Your sets are saved in this browser only. There is no account and nothing is uploaded, so they will not show up on your phone or in another browser, and clearing site data removes them. The backup box at the bottom of this page is how you move them.
Start with the block you already use
Open your last post, copy the hashtags off the end of it, and paste them below. Give the set a name you will recognise in a month: what it is for, not what is in it. Build a second one and the tool will start telling you which is due next.
A stray # is stripped, spaces and commas both split, and repeats inside one set are dropped. Your order is kept.
Backup and restore
Keep this somewhere you control: a note, a doc, an email to yourself. Paste it back below on another browser or after clearing your cache.
Restoring adds to what is here rather than replacing it, so nothing you already saved is lost.
A set manager, not a generator
- 1Save a blockThe tags you already trust, not ones a scraper ranked.
- 2Name itFor the kind of post it belongs to.
- 3RotateCopy stamps it used; the panel points at whatever is stalest.
Everything stays in this browser. That is both the privacy story and the honest limitation: nothing to sign up for, and nothing that follows you to another device unless you export it. Hashtags also spend your caption budget, so the character cost of each set is counted the way X counts it.
Common questions
- Where are my sets stored?
- In this browser only, with no account and nothing uploaded. They will not follow you to another device, and clearing site data wipes them, so use the backup box to export them as text.
- Does this suggest or rank hashtags for me?
- No. Suggesting tags means scraping platforms or paying for a data feed, and both go stale quietly. This organises the tags you already trust.
- How many hashtags can I put in a post?
- Instagram permits 30 per post and the tool flags any set over it. Elsewhere the real limit is your caption budget, which is why each set shows its character cost.
- Why rotate sets at all?
- Not because a platform provably penalises a repeated block: nobody outside those companies can verify that. Because a set built for one kind of post fits the next one badly, and readers notice.
- What does the character count mean?
- The length of the hashtag block, so you can subtract it from the caption limit you are writing to. The second, higher number is how X counts it: 23 per link, 2 per emoji.
Stop doing this by hand
Write the post once. Synapse publishes it to all nine networks on your schedule, with each one’s rules already applied.
More free tools
- Video specs checkerDrop in a video and see which formats it already fits (Reels, Shorts, TikTok, Stories or the feed) before you find out the hard way.
- Character counterPaste one caption and see it counted against all nine platforms at once, the way each network actually counts, not the way JavaScript does.
- Post previewSee one caption the way each network will actually show it, including exactly where every platform cuts it off behind a “more” link.