# Threads Image Size and Specs 2026

Every upload spec at a glance, with sources.

URL: https://shortformkit.com/threads-image-size/
Updated: 2026-10-12

**Threads Image 2026: files up to 8 MB, caption up to 500 characters, up to 1 hashtags.**

## All specs

| Minimum resolution | 320 px width |
|---|---|
| Maximum file size | 8 MB |
| File types | JPEG, PNG |
| Caption limit | 500 characters |
| Hashtag limit | 1 |

Notes (from the sources, in English): Threads API: JPEG and PNG, 8 MB max, width 320 to 1440 px, aspect ratio limit 10:1, sRGB. Carousels: 2 to 20 items (images and videos). 500-character post plus optional 10,000-character text attachment (since September 2025). One topic tag per post.

Work out bitrate and file size with the [file size calculator](https://shortformkit.com/video-file-size-calculator/). Check caption length with the [character counter](https://shortformkit.com/character-counter/).

## Changes in 2025 and 2026

- 2025-09-04: text attachments of up to 10,000 characters can be added to a post (base post limit stays 500).

## Sources

- [Threads API overview, media specifications (Meta for Developers)](https://developers.facebook.com/docs/threads/overview) (official)
- [Tag a topic in your post on Threads (Instagram Help Centre)](https://help.instagram.com/1356090605000312) (official)
- [Attach Text to Your Threads Posts (Meta Newsroom, 2025-09-04)](https://about.fb.com/news/2025/09/attach-text-threads-posts-share-longer-perspectives/) (official)

Checked: 2026-10-13. Confidence: official. [All platforms in one table: social media video specs 2026](https://shortformkit.com/social-media-video-specs-2026/)

## Other Threads formats

- [Threads Video](https://shortformkit.com/threads-video-size/)

## FAQ

**What is the maximum file size for a Threads Image?**
Up to 8 MB.

**How long can the caption of a Threads Image be?**
Up to 500 characters.

**How many hashtags can a Threads Image have?**
Up to 1.


Source: Shortform Kit (https://shortformkit.com/threads-image-size/). Free, no login.