$ previewer run insta-post

Instagram Post Preview Tool

Upload a photo, write your caption, and see exactly how it renders in-feed — crop ratio, caption fold, hashtag count, and dark mode included. Free, no login.

Start previewing ↓ Read the FAQ

post.json

// username

// location (optional)

// avatar

// verified badge

// photo

Click or drop a photo here

// crop ratio

// caption

2,200 characters left · 0 hashtags

// likes

// comments

// preview mode

// text saves to this browser only — photos are never uploaded anywhere

light-preview.png

Upload a photo to preview

1,204 likes

yourbrand Launching our summer collection this Friday ☀️ Tap the link in bio to get early access before it sells out. #summer #newdrop #earlyaccess

View all 38 comments

2 HOURS AGO

// why this matters

Small things that break a post.

Crops that cut off the subject

Square, portrait, and landscape all crop differently. Preview all three before you decide which ratio does your photo justice.

The caption "more" fold

Only the first couple of lines show before Instagram folds the rest behind "more." Put your hook there, not three lines in.

Hashtag overload

Instagram allows up to 30 hashtags, but a wall of tags can read as spammy. The live counter keeps you honest.

// what's inside

Everything you need to check before you post.

Three crop ratios

Preview your photo as square, portrait, or landscape — the exact ratios Instagram supports in-feed.

Live caption fold

See exactly where Instagram tucks your caption behind "more," so your hook lands before the fold.

Hashtag counter

A running count of every hashtag in your caption, live, so you never guess how many you've used.

Verified badge toggle

Flip on the checkmark to see how your post reads with a verified badge next to your username.

Light / dark mode

Switch instantly between Instagram's light and dark display modes without leaving the page.

No login, no posting

Nothing here connects to Instagram. It's a private, local mockup — nothing is ever published for you.

// how it works

Three steps, one clean post.

zsh

$ upload-your-photo // pick square, portrait, or landscape

$ write-your-caption // watch the fold and hashtag count

$ check-light-and-dark // then copy it into Instagram

$ ▍

// writing tips

Posts that earn the tap.

Hook before the fold

Put your strongest line in the first sentence — everything after "more" only gets read by people who already care.

Match the crop to the shot

Portrait (4:5) claims more feed space than square. If the photo has a clear subject, portrait usually wins.

Group hashtags at the end

A tidy row of hashtags after your caption reads cleaner than tags scattered mid-sentence.

Check it in dark mode

Light captions and pale graphics can wash out on Instagram's black background. The dark toggle catches it fast.

// faq

Questions, answered plainly.

What is the caption character limit on Instagram?

Instagram allows up to 2,200 characters in a caption, though only the first part shows before a "more" fold in the feed. This tool counts characters live and shows the fold as you type.

Which crop ratios can I preview?

You can preview square (1:1), portrait (4:5), and landscape (1.91:1) crops, matching the ratios Instagram supports for feed posts.

Does this tool post to Instagram for me?

No. This is a preview-only tool. It never connects to your Instagram account and never publishes anything on your behalf.

How many hashtags should I use?

Instagram allows up to 30 hashtags per post, though many creators use far fewer. This tool counts your hashtags live so you can see exactly how many you've added.

Is my caption or photo stored anywhere?

Your draft caption is saved only in your own browser's local storage so it survives a refresh. Uploaded photos are not saved and nothing is sent to a server.