My AI prompt is too large — reduce context tokens locally
Context window full? Paste your prompt, logs or JSON below. Everything is analyzed and optimized in your browser — no upload, no account, no AI required.
Input size—
Estimated tokens—
Secrets / emails—
Why does my prompt get too large?
LLMs have a fixed context window. When you paste raw logs, full JSON responses and stack traces, token count explodes fast:
Repeated log lines — retry loops can duplicate the same line thousands of times.
Pretty-printed JSON — indentation and whitespace alone can double the size.
Comments and boilerplate — generated code and headers the model does not need.
Secrets — API keys and tokens you should remove before sending anything anywhere.
How this tool reduces your context
The optimizer applies deterministic, fully local transformations and shows the estimated token saving of each one:
Remove duplicate lines — keeps the first occurrence of every identical line.
Collapse repeated log blocks — caps consecutive identical lines at 3 with a [repeated Nx] marker.
Strip comments — removes //, # and block comment lines.
Compact JSON — minifies any valid JSON (structure fully preserved).
Redact secrets — masks Bearer tokens, API keys and emails as <REDACTED>.
Is my data uploaded anywhere?
No. This page is a single static HTML file. All parsing and transformation runs in your browser's JavaScript engine. You can disconnect from the internet after the page loads — it keeps working.
Need the full toolbox?
This page is one tool from LocalDevToolbox — a private developer workstation with 15+ tools: stack trace analyzer, log doctor, cURL converter, JWT decoder, diff and more. Everything local, everything free.