Built this yesterday as a quick tool to solve a problem I've seen since 2017 — Slack exports are essentially unreadable JSON blobs with no good way to browse them.

SlArchive processes everything client-side in the browser using JSZip. Your export never touches a server. Drop the ZIP, browse channels, DMs, and threads, search across everything, then export to HTML, Markdown, or JSON if you need to migrate to another platform.

It's a single HTML file, MIT licensed, source at https://github.com/devrelopers/slarchive. Contributions welcome.

Tried self-hosting with Mattermost to get around Slacks 90 day free tier history but my team didn't care for it much. Ended up back on Slack's free tier. This may solve that issue for me, will check it out.

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