Tumblr won't tell you when you're over the character limit — it just fails when you hit publish, or silently drops your tag. Paste your text below to check before you post.
Each text block in a Tumblr post can hold up to 4,096 characters. Long posts split across multiple blocks.
Every place Tumblr quietly enforces a length cap, and what happens when you cross it.
Each text block in a Tumblr post caps at 4,096 characters. The official client doesn't show a counter and silently fails when you publish a block that's too long.
An individual tag can be up to 140 characters. Longer tags are silently dropped, so a typo can mean your post never appears in tag search.
Replies to asks are capped at 1,975 characters. Longer answers need to be split across multiple posts or moved to a regular text post.
Your blog bio caps at 2,000 characters. This is shared across all your blogs, so plan accordingly.
Custom pages allow up to 500,000 characters total. Note that HTML tags and even spaces count toward the limit.
Tumblr's editor doesn't show a live character count and won't warn you when you exceed a limit. The post simply fails to publish when you click 'Post', usually with a generic error. Checking length beforehand saves you from rewriting after a failed publish.
If a single text block exceeds 4,096 characters, Tumblr rejects the post entirely. For tags over 140 characters, Tumblr silently strips them — your post still publishes but the over-limit tag doesn't apply. This is especially painful because you can't tell from the UI that the tag was dropped.
No, it applies per text block. Long-form posts can have multiple text blocks, headings, and quotes — each is its own 4,096-character block. The total post size limit is 1 MB across all content blocks.
Tumblr lets you add up to 30 tags per post, but only the first 5 are indexed in public tag search. Tags 6 onward only help organize your own blog — they won't help with discovery. Each individual tag is capped at 140 characters.
Yes. Spaces, line breaks, emoji, and HTML markup all count toward the character total. For pages, even closing tags like </div> count.
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