Social Media Character Limits

This guide summarizes the most relevant text limits for each social network supported by Upload-Post. Keep these constraints in mind when building payloads so posts are accepted without truncation.

Platform-Specific Character Limits

Facebook Character Limits

Property	Description
post	63,206 characters maximum
title	Reels title – 255 characters maximum

Instagram Character Limits

Property	Description
post	2,200 characters maximum
altText	1,000 characters maximum per image
comment	2,196 characters maximum

LinkedIn Character Limits

Property	Description
post	3,000 characters maximum
title	400 characters maximum (UTF-16 code units; an emoji counts as 2) – the media title of a video or document post. A line break sent as CRLF counts as 2, so a title that measures 399 locally can still exceed the limit. Longer titles are trimmed with an ellipsis.

TikTok Character Limits

Property	Description
post	2,200 characters maximum (UTF-16 code units; an emoji counts as 2)
title (photo posts)	90 characters maximum (UTF-16 code units)
description (photo posts)	4,000 characters maximum (UTF-16 code units)

Pinterest Character Limits

Property	Description
post	800 characters maximum
title	100 characters maximum
link	2,048 characters maximum
altText	500 characters maximum

Reddit Character Limits

Reddit posting is currently unavailable (HTTP 503 error_code: "reddit_unavailable").

Threads Character Limits

Property	Description
post	500 characters maximum (UTF-8 bytes; an emoji is 4 bytes)
post (threads_long_text_as_post)	Up to 10,000 characters as a single post

X (Twitter) Character Limits

Property	Description
post	280 characters maximum
post (Premium)	25,000 characters maximum for Premium and Premium Plus accounts
altText	1,000 characters maximum per image
subTitleName	150 characters maximum

URLs are automatically removed from X posts

Upload-Post strips every URL that X would turn into a clickable link from any caption, title, description, or first_comment sent to X (Twitter), before the post is published. This applies to video, photo, and text uploads via every endpoint and via the scheduler.

Why: X charges $0.200 per "Content: Create (with URL)" request versus $0.015 for posts without a URL — a 13× surcharge. To keep pricing predictable, every parseable link is removed before the tweet leaves Upload-Post.

What gets stripped: anything X's parser recognises as a URL:

• Schemed URLs: https://…, http://…, ftp://…, ws://…
• www.host.tld[/path]
• Common shorteners: t.co/…, bit.ly/…, tinyurl.com/…, lnkd.in/…, youtu.be/…, etc.
• Bare hostnames with a path: example.com/posts/1
• IPv4 with a path: 192.168.1.1:8080/admin
• Markdown link syntax: [text](https://…) (the URL portion is removed)

What is NOT stripped: anything that X does not parse as a link does not trigger the surcharge, so we leave it alone — e.g. example[.]com, example(dot)com, hxxp://…, unicode-dot lookalikes (example．com), or bare domains with no path. These display as plain text in the tweet and are billed at the normal $0.015 rate.

If you need to share a link, put it in your X profile bio or render it visibly inside an image/video. To keep URLs in your X posts instead of having them stripped, see the X Links add-on.

Bluesky Character Limits

Property	Description
post	300 characters maximum
images	Up to 4 images per post
altText	Supported

Discord Character Limits

Property	Description
message	2,000 characters maximum (longer text is truncated)
attachments	Up to 10 images per message

Telegram Character Limits

Property	Description
message (text)	4,096 characters maximum (longer text is truncated)
caption (photo/video)	1,024 characters maximum
album	Up to 10 photos per sendMediaGroup

YouTube Character Limits

Property	Description
post	5,000 characters maximum (also validated as 5,000 UTF-8 bytes)
youTubeOptions > title	100 characters maximum
youTubeOptions > tags	500 characters total, 2+ characters each
youTubeOptions > subTitleName	150 characters maximum

Snapchat Character Limits

Property	Description
Spotlight description	500 characters maximum
Saved Story title	45 characters maximum

Notes:

• Stories are ephemeral (24 hours) and don't support text captions
• Saved Stories are permanent on your public profile
• Spotlight posts are permanent and reach wider audiences
• Only one media item (video or image) allowed per post
• Hashtags are supported and clickable in Spotlight posts

Content Restrictions

Banned Hashtags

Google Business Profile Character Limits

Field	Limit
Post summary (title)	1,500 characters
Event title	58 characters
Offer coupon code	58 characters
Offer terms	1,000 characters
CTA URL	Standard URL length

Notes:

• Google Business Profile supports one photo per post via the API.
• Video uploads are supported (max 30 seconds / 28 MB).
• Product posts cannot be created via the API.

Upload-Post validates content against a list of prohibited hashtags before posting to Instagram. Posts containing any of these hashtags will be rejected with a validation error. The complete list of banned hashtags includes:

A: anorexia, alone, a$$, antivax, abdl, addmysc, adulting, always, armparty, asiagirl

B: beautyblogger, bikinibody, boho, blogladrona, brain, besties, bikinibod

C: costumes, curvygirls, cancer

D: date, dating, desk, dm

E: elevator, edm, endme

F: followtrain, followtrains

G: graffitiigers, girlsonly, gloves

H: hardworkpaysoff, happythanksgiving, humpday, hustler, hotgirls

I: iphonegraphy, italiano, ifb

K: kansas, killingit, kissing, kill, killme, killyourself, kys

M: master, models, mustfollow, milf, midget

N: nasty, newyearsday

P: petite, petitegirls, pushups, payme

S: saltwater, shit, shower, single, singlelife, skype, snap, snapchat, snapchatme, snowstorm, sopretty, stranger, streetphoto, sunbathing, swole, suicide, suicideawareness

T: tag4like, tanlines, teens, teen, thought, todayimwearing

U: undies, unbalanced

V: valentinesday

W: workflow

Y: youngmodel, yolo

If your content includes any of these hashtags, remove them before submitting your request to avoid validation errors.

API Considerations

• Upload-Post validates payload sizes before sending them to social networks whenever limits are known. Requests that exceed the documented limits return a validation error.
• Some platforms might truncate overlong text instead of rejecting it (Meta products and YouTube occasionally do this). Inspect the per-platform response inside results to confirm the final content.
• For channels with strict limits such as X, consider shortening URLs in your application prior to calling the Upload-Post API.

Updates and Changes

Social networks regularly adjust their limits. We keep this page aligned with the latest behavior we observe in production, but you should also:

• Check Upload-Post API responses for detailed error messages about rejected posts.
• Subscribe to our release notes for platform updates.
• Revisit this reference periodically, especially before large content campaigns.