$ previewer run reddit-post

Reddit Post Preview Tool

Write your title, pick text, image, or link, and see exactly how it renders in a Reddit feed — character limit, tags, votes, and dark mode included. Free, no login.

Start previewing ↓ Read the FAQ

submit.json

// community

// posted by

// community icon

// flair (optional)

// NSFW tag

// spoiler tag

// post type

// title

300 characters left

// body text

// score

// % upvoted

// comments

// preview mode

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

light-preview.png

What's the one marketing tactic that actually moved the needle for you this year?

1.2k

86 Comments Share

94% Upvoted

// why this matters

Small things that sink a post.

The title is the whole pitch

Most people decide to click based on the title alone. At 300 characters max, every word has to earn its place.

Images aren't cropped, just squeezed

Reddit scales images to fit without cropping them. A very tall or wide image can look cramped or tiny in the feed.

Tags change how a post reveals

NSFW and spoiler tags blur the post until someone clicks through. Preview them here so you know what readers see first.

// what's inside

Everything you need to check before you submit.

Live title ring

A real-time 300-character counter for your title, so you never get caught over the limit.

Text, image & link layouts

Switch post types and see the exact layout Reddit uses for each — no guessing which fits best.

NSFW & spoiler tags

Toggle either tag to preview the badge exactly as it would appear next to your title.

Vote score formatting

Enter a score and it renders in Reddit's familiar "1.2k" style, alongside an upvote percentage.

Light / dark mode

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

No login, no posting

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

// how it works

Three steps, one clean post.

zsh

$ write-your-title // watch the 300-character ring

$ pick-a-post-type // text, image, or link

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

$ ▍

// writing tips

Posts that survive the front page.

01

Be specific, not clickbait

Reddit communities reward titles that describe exactly what's inside. Vague hype tends to get downvoted fast.

02

Match the flair to the sub

A relevant flair signals you've read the room. Check the community's rules before you pick one.

03

Keep images at a normal ratio

Extremely tall or wide images get squeezed awkwardly. Preview it here before you upload the original file.

04

Tag before you're asked to

If there's any doubt, mark it NSFW or spoiler yourself — mods and readers notice when you don't.

// faq

Questions, answered plainly.

What is the title character limit on Reddit?

Reddit post titles are limited to 300 characters. This tool counts characters live and warns you as you approach the limit.

Can I preview text, image, and link posts?

Yes. Switch between text, image, and link post types to see how each one renders differently in a Reddit feed.

Does this tool post to Reddit for me?

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

Can I preview NSFW or spoiler tags?

Yes. Toggle the NSFW or spoiler tag to see how the badge appears next to your title before you post.

Is my post text or image stored anywhere?

Your draft title and body text are saved only in your own browser's local storage so they survive a refresh. Uploaded images are not saved and nothing is sent to a server.