How to pick a random Instagram giveaway winner, and prove it was fair

Why "random comment picker" websites are hard to trust

Most comment pickers ask for a post link, fetch some of the comments on their server, and show a winner. Nobody can check which comments were included, whether the draw was repeated until a friend won, or whether the result was random at all. A screen recording only shows that a button was clicked.

A verifiable draw works the other way around: the list of entrants is fixed and fingerprinted first, and only then is the random number created, by a public source nobody controls. Anyone can redo the calculation afterwards and get the same winner.

Rules that match your Instagram post

Copy the rules you announced. "Tag 2 friends" becomes a minimum of 2 tags (tags of your own account and of the commenter don’t count). "Comment with #yourhashtag" becomes a required word. "Ends Sunday 8 pm" becomes the deadline: later comments are excluded.

You can also give one entry per person even if they commented ten times, add bonus entries per extra tag, only count the first N people, or exclude your team, partner brands and past winners. Each excluded comment shows the rule it broke, which makes "why didn’t I win?" messages easy to answer.

How the draw stays fair

When you click Draw, the eligible entrants are sent to our server, put in a fixed order and fingerprinted with SHA-256, and the time is recorded. The server then picks a round of drand, a public randomness beacon run by the League of Entropy, that will only be published about 30 seconds later.

Once that random number exists, the winners are computed from it with a published algorithm. Because the list was locked before the random number existed, nobody, you included, could have chosen the winner. Every new draw for the same giveaway is listed on the certificate with its reason.

Announcing the winner

The extension creates a feed image (1080×1350) and a story image (1080×1920) with the winners, the number of entrants and the certificate’s QR code, plus a caption to copy. Followers who scan the code open the certificate, and their browser re-checks the whole draw: the entrant list, the random number’s signature and the winners.

Participants can also type their username on the certificate to check they were in the draw, even if you chose to keep the full list private.

If the winner doesn’t answer

Draw one or more backup winners at the same time: they are listed in order on the certificate. If you prefer to draw again, give a reason (for example "winner did not reply within 48 hours"); the new draw and its reason appear publicly, so the giveaway stays transparent.

Instagram’s rules for promotions

Instagram lets accounts run giveaways, but the host is responsible for running them lawfully: official rules, eligibility, prize and any local sweepstakes laws. Instagram’s promotion guidelines also ask you to say that the promotion is not sponsored, endorsed or administered by Instagram. Avoid tagging people in content they don’t appear in.

The free version loads 300 comments per post and draws among up to 300 entrants with one winner, certificate included. Pro ($24.90 once) removes the limits and combines several posts in one giveaway.