Free, open-source social publishing from localhost
Crossposter is a free, open-source social publishing tool that runs entirely from your local machine. It belongs to the category of social media management applications but distinguishes itself by being self-hosted and privacy-first. Designed for developers, content creators, and anyone managing multiple social accounts, it provides a single composer to write a post once and distribute it to over a dozen platforms. The core value is eliminating the need to log into each site separately while keeping your credentials and data under your control. By running locally via Node.js, Crossposter ensures that no third-party cloud servers ever see your drafts or tokens. This approach appeals to users who are tired of recurring subscription fees for cloud schedulers and want a transparent, auditable workflow.
The primary pain point Crossposter addresses is the fragmentation of social media publishing. Typically, a user must log into each platform individually, adapt content to different character and media limits, and remember which accounts have been updated. This process is time-consuming and error-prone, leading to missed posts or inconsistent branding. Cloud-based schedulers centralize the process but introduce privacy concerns, as credentials are stored on external servers and content passes through third-party infrastructure. Crossposter solves this by operating on localhost: you configure providers once, then compose and select targets from one dashboard. It checks each platform's known limits before posting, preventing rejection and saving the frustration of fixing failed submissions. For users who value data sovereignty and want to avoid monthly fees, this local-first approach is a compelling alternative.
The One Composer feature unifies your writing workspace into a single view. When you open the dashboard at localhost:2004, you see fields for title, link, post body, and media uploads alongside a checklist of your connected social accounts. This design keeps all elements visible at once, so you can compose the core message and then decide which platforms to target. Because the limits differ per platform, the composer shows warnings only when a selected social would reject the draft—for example, a 280-character tweet warning appears only if X is checked. This contextual feedback reduces noise and helps you tailor content on the fly. The benefit is a streamlined workflow: you write once, but each platform receives a compliant version without manual reformatting.
Crossposter includes a preflight warning system that checks content against each target platform's known restrictions before you hit publish. These warnings are not generic; they are tied to the actual limits parsed from the provider's specifications. For instance, if you attach a 20 MB image and Instagram is selected, Crossposter flags the exceeding size limit because Instagram accepts up to 8 MB. Similarly, text character counts for X, LinkedIn, and Mastodon are validated. Alongside warnings, Provider Profiles allow you to save multiple accounts per platform—such as a LinkedIn personal profile and a company page—stored locally in a JSON config file. You can quickly switch between profiles on the dashboard, streamlining the process of posting from different identities without re-authenticating.
Publisher
A
admin
Launch Date2026-06-07
Pricingfree
Domain Authority
Ahrefs DR0/100