Convert massive datasets to TOON and slash AI & LLM costs.
Bulk Toon Converter is a no-cost tool that transforms your JSON, JSONL, and CSV files into TOON—the compact, structured format designed for modern models. Keep data lossless, cut tokens, and ship cleaner prompts in minutes.
Real-time savings snapshot
Every conversion shows exactly how many tokens you’re saving before the first API call.
38%
Avg. token savings
3.8M+
Files converted
$4.2M
Spend avoided
✅ Zero schema drift between JSON, JSONL, CSV, and TOON.
✅ Powered by the official @toon-format/toon library.
✅ Built for ops, research, and prompt engineering teams.
Why teams switch
Built for token efficiency, not paywalled tooling.
Instead of renting another dashboard, Bulk Toon Converter gives you a free, reliable way to shrink payloads while keeping every field verifiable. From CSV exports to JSONL logs, you always know how much context budget you’re saving.
Multi-format ingestion
Drop JSON, JSONL, or CSV data and watch Bulk Toon Converter emit a perfectly tabular TOON stream that keeps schemas intact.
LLM cost intelligence
Each run shows before/after token counts so you know exactly how much context budget you reclaim before ever hitting the API.
Bulk-ready pipelines
Batch entire corpora, get per-file status, and download clean TOON archives for prompt libraries, analytics, or fine-tuning.
Zero-cost forever
The converter is free, open, and powered by the official @toon-format/toon SDK—no seats, no throttling, no surprises.
Playbook
How Bulk Toon Converter keeps your prompts lean.
Replace brittle scripts with a single TOON-native workflow. Feed the output directly to prompt libraries, evaluation harnesses, or agent memory without burning through context limits.
Add your data
Paste JSON, stream JSONL logs, or upload CSV exports. Nested objects and uniform tables are all supported.
Convert & compare
We apply TOON’s schema-aware tables, fold safe keys, and return a compact output plus token savings telemetry.
Ship to models
Pipe the new TOON files straight into GPT, Claude, Gemini, or your own agents to unlock cheaper, more reliable prompts.
Example conversion
JSON in, TOON out—ready for any model.
TOON expresses uniform arrays as compact tables so GPTs, Claudes, and Geminis can reason over structure without hallucinating.
JSON
{
"records": [
{ "id": 1, "plan": "scale", "tokens": 9123 },
{ "id": 2, "plan": "pro", "tokens": 4211 }
]
}TOON (−39% tokens)
records[2]{id,plan,tokens}:
1,scale,9123
2,pro,4211Where teams plug it in
Use TOON anywhere precise context matters.
Prompt libraries
Bundle dozens of prompts with TOON data tables and keep every run under the context limit.
Ops & analytics
Convert nightly JSON/CSV exports into TOON so analysts can query models without burning budget.
Agent orchestration
Provide agents with compact state snapshots that remain readable and verifiable by humans.
FAQ
Everything you need to deploy TOON with confidence.
What is Bulk Toon Converter?
A free web studio for turning verbose JSON, JSONL, and CSV datasets into TOON—an ultra-compact, lossless format optimized for AI models.
How does this reduce AI spend?
TOON removes filler characters while keeping structure explicit. Fewer tokens means smaller context windows and noticeably lower inference bills.
Can I automate it?
Yes. The UI is backed by @toon-format/toon, so you can replicate the exact pipeline inside scripts, workers, or ETL jobs.
Ready to build?
Launch the Bulk Toon Converter studio and cut your token bill in half.
Instant conversions, bulk uploads, and analytics built for AI and LLM teams moving fast.