No. There is no way to send a DM to all your followers on Instagram, and there is no tool that can do it for you without putting your account at risk. This is not a feature nobody has built yet. It is a rule in the platform, and it applies the same way to every product on Instagram's official API.
That answer disappoints people, so it is worth spending a minute on why the rule exists and what it leaves you. What it leaves is more useful than it sounds.
Why Instagram will not let you
Instagram messaging is a reply system. A business can answer a person who has contacted it; a business cannot start the conversation. Everything else follows from that one sentence.
When somebody sends you a DM, replies to one of your stories, or taps a button inside a message you sent, they open a 24-hour messaging window. Inside it you can reply freely. When it closes, ordinary automated messages to that person are refused by the platform, not by your tool.
A follower who has never written to you has never opened a window. Neither has somebody who watched every story you posted, or liked forty of your reels, or bought from you last year. Attention is not a message, and only a message starts the clock.
What about tools that advertise it
Search for a way to message everyone and you will find products promising it. They generally fall into three groups, and only one of them is safe.
Tools on the official API that mean something narrower. Most "broadcast" or "bulk DM" features on legitimate products mean everyone currently reachable, which is the 24-hour group above. The feature is real; the headline is just loose. This is the group worth using, and the way to check is to ask what the number on their send button counts.
Tools that automate your account by holding your password. These log in as you and type into the app the way a person would. That is not the official API, it breaks Instagram's terms, and the account that pays for it is yours rather than theirs. Restrictions, action blocks and bans all sit on your side of that arrangement.
Tools counting a stale list. A saved contact list will happily show you a large number, and a send to it will be refused person by person for everyone whose day has passed. The message never arrives, and depending on the product you may not be told clearly why.
What you can actually do
Four things, and between them they cover most of what people wanted the impossible feature for.
Message everyone who is reachable right now. One message, written once, to everyone who contacted you in the last day: your broadcast DM. For an account that has just posted something that did well, this is a genuinely large group, and it is the closest real equivalent to what people are searching for.
Make the window open in the first place. This is the part that decides the size of everything else. A post that asks for a comment, a story with a question sticker, a reel that invites a keyword: each reply is a conversation you may answer. Comment-to-DM automation exists precisely to turn that engagement into conversations at a scale you could not answer by hand.
Answer instantly, so the window is spent well. A conversation answered an hour later is still open; the person's attention often is not. Automation earns its keep by replying in seconds.
Own a list somewhere you control. If you genuinely need to reach people on your schedule rather than theirs, that is what email is for. An email capture gate collects addresses inside the DM, and an address does not expire in 24 hours.
The honest way to compare tools
Ask one question: what does the number on the send button count?
If it counts people whose conversations are currently open, the tool is telling you the truth and you can plan around the figure. If it counts saved contacts, the figure is a maximum you will never hit, and the shortfall arrives as a wall of failures after you have already pressed send.
It is the same question behind every claim in this category. Instagram's rules are public and identical for everyone building on the official API, so no product has a secret route around them. What differs is whether a product tells you where the edges are before you run into them.