# Guides, free tools and docs for PostBoost

Learn social media scheduling, AI content and automation, try 57 free tools, or set up the API and MCP for your AI agent.

## Learn

Practical guides to social media with AI, scheduling, analytics and automation.

- [TikTok Caption Character Limit 2026: 4,000 vs 2,200](https://postboost.co/learn/tiktok-caption-character-limit.md) (Scheduling, 2026-10-21): TikTok's app takes captions of up to 4,000 characters, but scheduling tools get 2,200 through TikTok's API. What counts, emoji math and how to write one.
- [How to Schedule Posts on Bluesky (No App Password Needed)](https://postboost.co/learn/how-to-schedule-posts-on-bluesky.md) (Scheduling, 2026-10-21): Bluesky has drafts but no scheduling. How to schedule Bluesky posts and threads with PostBoost, from the composer, the REST API or an AI assistant.
- [Threads Character Limit 2026: 500 per Post, and Why Emoji Cost 4](https://postboost.co/learn/threads-character-limit.md) (Scheduling, 2026-10-20): A Threads post holds 500 characters, but Meta counts each emoji as its UTF-8 bytes. All Threads limits: links, topic tags, media, alt text, attachments.
- All 17 guides: https://postboost.co/learn.md

## Free tools

- [Blog to social media post generator](https://postboost.co/tools/blog-to-social-media.md): Paste a blog post URL and get AI captions for Facebook, Instagram, X, LinkedIn, Pinterest, YouTube, TikTok and Mastodon, sized for each network. Free.
- [Social media post checker: check your post before you publish](https://postboost.co/tools/social-media-post-checker.md): Check a post before posting: character limits, hashtags, media count, video length and see-more cut-offs for X, Instagram, LinkedIn, TikTok and more.
- [Social media character counter](https://postboost.co/tools/social-media-character-counter.md): Free character counter for X, Threads, Bluesky, Instagram, LinkedIn, TikTok and more. Counts as each network does, live in your browser.
- [Best time to post on social media, by network and weekday](https://postboost.co/tools/best-time-to-post.md): Best times to post on Instagram, Facebook, LinkedIn, X and TikTok by weekday, from Sprout Social, Buffer and Hootsuite, side by side with sources.
- [UTM builder for social media links](https://postboost.co/tools/utm-builder.md): Build UTM-tagged links for social posts in your browser: network presets, live preview, naming warnings and saved presets. Free, no signup.
- [Social media image sizes, with a free resizer](https://postboost.co/tools/social-media-image-sizes.md): Image sizes for Instagram, Facebook, LinkedIn, X, TikTok, YouTube, Pinterest and more, each with its source. Crop and resize your image in the browser.
- All 57 free tools: https://postboost.co/tools

## For developers and AI agents

MCP, the REST API and webhooks are included on every plan, including Free.

- [Connect your AI agent](https://postboost.co/agents): Set up Claude, ChatGPT, Cursor, VS Code and other MCP clients.
- [Docs](https://postboost.co/docs/intro/): Concepts, quickstart, authentication and guides.
- [API reference](https://postboost.co/docs/api/postboost-api/): Every endpoint, built from the OpenAPI spec.
- [SDKs](https://postboost.co/docs/sdks/): 9 SDKs, including a CLI, generated from the same spec.
- [Webhooks](https://postboost.co/docs/webhooks/): Get told when a post publishes, fails or an account disconnects.
- [API changelog](https://postboost.co/docs/changelog/): What changed in the API, newest first.

## Compare PostBoost

- PostBoost vs Ayrshare: https://postboost.co/compare/ayrshare
- PostBoost vs Zernio: https://postboost.co/compare/zernio
- PostBoost vs Postiz: https://postboost.co/compare/postiz
- PostBoost vs Blotato: https://postboost.co/compare/blotato
- PostBoost vs Upload-Post: https://postboost.co/compare/upload-post
- PostBoost vs Buffer: https://postboost.co/compare/buffer
- PostBoost vs Publer: https://postboost.co/compare/publer
- PostBoost vs SocialBee: https://postboost.co/compare/socialbee
- Best social media APIs: https://postboost.co/best-social-media-apis
- Best social media MCP servers: https://postboost.co/best-social-media-mcp-servers
- All comparisons: https://postboost.co/compare

## Need help?

- [Contact us](https://postboost.co/contact): A real person reads every message. First reply within one business day (Monday to Friday, 08:00–18:00 UTC).
- [Fix a disconnected account](https://postboost.co/docs/connection-health/): See why a network drops a connection and how to reconnect it.

## This page in one paragraph

PostBoost publishes for teams and their AI agents on 15 channels. This hub links to everything that is free to read or use: 17 guides on /learn, 57 free tools, the docs and API reference, the MCP setup for AI agents, comparison pages and support. Support answers by email at hi@postboost.co, Monday to Friday, 08:00–18:00 UTC.

```text
page: https://postboost.co/resources
learn: https://postboost.co/learn (feed: https://postboost.co/learn/feed.xml, index: https://postboost.co/learn.md)
tools: https://postboost.co/tools (57 free tools)
docs: https://postboost.co/docs/intro/
api_reference: https://postboost.co/docs/api/postboost-api/
openapi: https://postboost.co/docs/openapi/postboost-api.yaml
mcp: https://postboost.co/mcp (setup: https://postboost.co/agents.md)
changelog: https://postboost.co/docs/changelog/
compare: https://postboost.co/compare
pricing: https://postboost.co/pricing.md
llms: https://postboost.co/llms.txt
support: https://postboost.co/contact (hi@postboost.co, Monday to Friday, 08:00–18:00 UTC)
signup: https://postboost.co/app/register
```