Show HN: Compressor.app – Compress almost any file format
matylla Friday, March 13, 2026
Got real tired of juggling five tabs and a terminal to compress different file types. So I built something that handles them ALL in one place.
Supports 50+ input formats. If something is compressible it will handle it. Upload a file, it figures out what it is, compresses it, hands it back. Ephemeral storage for 2 hours. Format conversion works pretty well too.
The part I'm most happy with is the detection layer. For binary formats, magic bytes get you most of the way there. For text-based (JS, CSS, JSON, XML, etc) I run a small ML classifier on the content itself to identify the format and route it to the right compression pipeline without asking the user to specify.
REST API if you want to plug it into a pipeline. Webhooks for async jobs, bring-your-own-storage for S3/GCS/Azure/whatever. Batch jobs work well.
No signup required, free tier with very generous monthly quota. Feedback, edge cases that break the detector, feature requests - all welcome.