What is the maximum length of a Reddit post title?

A Reddit post title can be up to 300 characters. Titles are the single most important field for reach, so use the space, but front-load the key information because feeds and search truncate long titles in the preview.

How long can a Reddit comment be?

A Reddit comment can be up to 10,000 characters. That is enough for a long-form reply, but very long comments are often collapsed, so lead with your main point and use formatting to break up walls of text.

What is the character limit for a Reddit self-post body?

The body of a text (self) post can be up to 40,000 characters. This is the longest single field on Reddit and supports full Markdown formatting, so it suits guides, FAQs, and detailed write-ups.

How many characters can a Reddit username be?

A Reddit username is between 3 and 20 characters and may contain letters, numbers, underscores, and hyphens. It cannot be changed after creation, so choose carefully. The display name is separate and can be edited later.

Does Reddit count spaces and emoji toward the limit?

Yes. Spaces, line breaks, and punctuation each count as one character. Emoji and other non-ASCII characters can count as more than one because they use multiple code units, so this tool counts both characters and code units.

Reddit Character Limit Counter

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Reddit silently truncates or rejects text that exceeds a field’s limit, and those limits differ by field. This counter enforces Reddit’s real per-field caps as you type, with a colour-coded bar that warns you before you go over.

How it works

Each Reddit field has a fixed maximum character count. The tool compares the length of your text against the selected field’s cap and shows how much room is left. Character length is measured two ways:

characters    = number of Unicode code points (what users perceive)
code units    = string.length (what some platforms count)
remaining     = limit − characters

The progress bar turns amber as you cross about 90 percent of the limit and red once you exceed it. Emoji and accented characters can occupy more than one code unit, so both counts are shown to avoid surprise truncation.

Field limits and tips

Title caps at 300 characters, comment at 10,000, and a self-post body at 40,000. Usernames are 3–20 characters and permanent; display names and bios are shorter and editable. Front-load the important words in titles because the feed preview truncates them long before the 300-character ceiling. Everything runs locally in your browser — no text is uploaded.