Social media limits by network
Video length, file size, image dimensions and character limits, each with the network's own page as the source and the date it was checked. Where PostDaily's limit differs, it says so.
- Instagram limitsAn Instagram caption holds 2,200 characters and up to five hashtags, the cap Instagram's help centre now states; it was 30 until December 2025. Here is every Instagram limit that decides whether a post goes out, with the page each number comes from, including two places where Meta's own documents disagree.
- YouTube Shorts limitsA YouTube Short can be up to three minutes long, the limit since 15 October 2024; before that it was 60 seconds. The video must be square or vertical. Here is every limit that decides whether an upload lands as a Short, including the title and description character limits, with the YouTube page each number comes from.
- TikTok limitsA TikTok video sent from a scheduling app can be up to 4 GB and up to 10 minutes long (3 or 5 minutes on some accounts), with a caption of up to 2,200 characters. The TikTok app itself takes uploads of up to 60 minutes. These are the limits of TikTok's Content Posting API, the route every scheduler uses, with the TikTok page each comes from.
- Pinterest limitsA Pinterest account can hold up to 200,000 Pins and 2,000 boards, according to Pinterest's developer documentation, although its help centre says there is no limit on how many Pins you create. The right Pin size is 1000×1500 pixels, a 2:3 ratio. Here is every Pinterest limit, from Pinterest's own pages.
- X (Twitter) limitsA post on X can be 280 characters, counted X's way: every link is 23 and each emoji is 2. X Premium raises that to 25,000. A post takes up to four photos, or one GIF, or one video, and since September 2026 X's API takes videos of up to 20 minutes from a standard account. Here is every X limit, with the X page each comes from, and where X's own pages disagree.
- Facebook limitsMeta doesn't publish a character limit for Facebook posts. The 63,206 quoted everywhere is the figure scheduling tools enforce, not one any Meta page states. What Meta does document: photos under 10 MB through its API, Reels of 3 to 90 seconds from apps, Story limits, and a monthly link limit on some Pages. Here is every Facebook limit we could source, with the Meta page each comes from.
- LinkedIn limitsA LinkedIn post can be 3,000 characters, on a profile or a Company Page. It can carry up to 20 images, one video of up to 15 minutes in LinkedIn's app (10 on a Page, 30 through LinkedIn's API), or a PDF of up to 300 pages. Here is every LinkedIn limit, with the LinkedIn page each comes from.
- Threads limitsA Threads post can be 500 characters, and Meta counts each emoji as its size in bytes, so one smiley uses 4 of them. A post can hold up to 5 different links, a carousel up to 20 photos and videos, and a video up to 5 minutes. Here is every Threads limit, from Meta's own pages.
- YouTube limitsA YouTube thumbnail should be 3840 by 2160 pixels at 16:9, at least 640 pixels wide, as a JPG or PNG under 50 MB from a computer. A title holds 100 characters, a description 5,000 bytes, and a video can run 15 minutes until the account is verified, then up to 12 hours. Here is every limit for regular YouTube videos, from YouTube's own pages. Shorts have a page of their own.
- Bluesky limitsA Bluesky post holds 300 characters, and no more than 3,000 bytes. It can carry up to 4 images in a regular post, or 5 to 10 as a gallery, which Bluesky added in June 2026. A video can run 10 minutes and be up to 300 MB, and the account needs a confirmed email to post one. Here is every Bluesky limit, from the post format Bluesky publishes and its app's source code.
- Mastodon limitsA Mastodon post holds 500 characters by default, but each server sets its own limit, and some allow thousands. Every link counts as 23 characters, and a content warning counts toward the limit too. A post can carry 4 images or one video, images up to 16 MB and video up to 99 MB. Here is every Mastodon limit, from Mastodon's source code and live servers.
Character limits for every network are in the character limits guide, and the video format checker tests a file against these rules in your browser.