Densely packs logs, JSON, tool outputs and code into 2×–8× fewer tokens — with guaranteed byte-exact reconstruction, verified by sha256 on every decompress. Nothing is summarized. Nothing expires. Nothing is ever dropped.
Densely reclaims the difference. Compressed bytes are re-encoded as a stream of 65,536 single-token English words — the o200k pre-tokenizer never merges across word boundaries, so every carrier word costs exactly one token and carries two bytes of compressed data. That's 16 of the ~17.6 available bits: 91% of channel capacity.
A hook compresses every large tool output on the fly — no workflow changes. A savings ledger shows tokens saved today and this week, so the effect on your usage cap is visible, not vibes.
Works in Claude Code and Cursor today: compress_file, search, expand. The agent searches inside compressed payloads and expands exact slices — without inflating the whole thing back into context.
pip install densely, three commands. Compressed payloads are plain text: they survive context compaction, session export, and machine moves. No cache, no TTL, nothing to expire.
Qwen2.5-Coder + arithmetic coding pushes code from 2.02× to 7.27× — 86.3% fewer tokens, still byte-exact. A record for lossless compression on code.
Tools like Headroom keep compressed content readable by the model — by selecting what to keep. Densely keeps every byte — but the payload is opaque until expanded. Different trade, different jobs.
Open source, MIT, runs locally. Benchmarks ship with the repo.
Managed proxy, team savings dashboard, cloud neural compression. Coming soon.
Join the waitlist →