Does Instagram auto-caption Reels?
It can add its own captions. Treat those as a backup for spoken words, not as your marketing line. If the only sentence that matters is theirs, you do not control the wording or the placement.
Reels
How to make Instagram Reels with captions
Short answer: Export a vertical file with the point burned into the middle of the frame, not along the bottom. Use the Instagram caption field for the longer note, not for the only sentence that matters. Pick a cover frame that still makes sense as a still. Then post it yourself after you watch it inside the app, because the preview on your computer does not show the buttons.
A Reel on Instagram is a vertical file plus a cover plus a caption field. The on-screen line and the caption field do different jobs, and the buttons will cover your type if you ignore them.
Make the file before you open Instagram
Do the cut, the line, and the mute test before you upload. Instagram is a publishing step. If you design the type inside the composer, you will compromise the sentence to fit a sticker, and you will not have a file you can also send to a customer. Finish the file. Then upload the file.
9:16 is the frame to design for. A horizontal video with captions along the letterbox looks like a meeting recording, because it is one. Crop only if the proof stays in frame. If the crop deletes the screen you are demonstrating, keep that video for a feed post and film the next demo with the phone in mind.
On-screen text versus the caption field
On-screen text is what people see while the video plays, including with the sound off, including if they never tap 'more.' The caption field is the paragraph under the video. It can hold the story, the caveat, and a single next step. It cannot rescue a reel whose picture says nothing.
Do not paste the same sentence in both places and call it a strategy. Use the picture for the fact. Use the field for the context a buyer needs before they follow: who it is for, what it does not do, or where to see the rest. Hashtags are optional seasoning. They are not the caption.
On the picture "Import finished. Invoice went out." In the Instagram caption field "For agencies that bill when the call ends. We don't replace your CRM. This writes the invoice back to it. The full demo is on the site." The field can be a paragraph. The picture cannot.
Cover frame
The cover is a still. It has to work without motion. Pick a frame where the line is already on screen, or add the line to the cover on purpose. A cover that is your face mid-blink, with the hook appearing a second later, looks like an accident in the grid.
The grid crops covers. Keep the words near the center. A clever line along the bottom of the cover becomes half a line on the profile. Look at your own grid after you post one. That is the spec that matters, more than a template from last year.
Length, safe zones, and sound
Shorter is easier to read. A Reel can be longer than a few seconds, but every extra second needs a reason to stay. If the claim landed, end the file. Looping a logo is not a reason.
The right side is buttons. The bottom is your name, the audio label, and the caption. The top can pick up the following row. Put the line in the middle band. Then upload a draft only you can see, or watch the posted Reel on a second phone, and check that no word sits under a button. Layouts change. This check is the maintenance.
Original audio is fine when the voice adds proof. Trending audio is a different game, and it often fights a spoken demo. If you use a trending sound, the on-screen line has to carry even more, because the audio is no longer explaining the product. Do not assume the sound will be on. After you post, watch the Reel from a second account or a friend's phone once. Your own preview hides the way the caption field collapses, and that collapse is where a long line you were proud of becomes an ellipsis. If a word sits under the audio credit, move the type up and replace the file. Editing the caption field will not move burned-in type.
- Design 9:16, type in the middle band.
- Burn in the one-line fact.
- Put context in the caption field.
- Choose a cover where the line is readable as a still.
- Watch it inside Instagram before you call it done.
Where Runmeg fits
ReelGen gives you files from a video you upload, with the line written from your product voice. It does not log into Instagram and post them. You still pick the cover, the caption field, and the account. That last mile is the Instagram-specific part, and it should stay with the person who owns the account. If a file looks right in your downloads folder and wrong in the app, trust the app. Re-export with the type higher. Do not argue with the preview you saw on a laptop.
Questions
Should I put hashtags on the Reel?
A few relevant ones in the caption field do not hurt. A block of thirty tags is not a caption strategy, and it does not fix a vague on-screen line.
Can I post the same file to Stories?
Often yes, if the type is still clear when Stories adds its own chrome. Check it. Do not assume the Reel safe area and the Story safe area are the same.
What length should a product Reel be?
Long enough to show the step and short enough that the line is still the point. If you are padding to hit a number you read online, cut it back to the proof.