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Training Text Length Analyzer

Analyze text lengths across prompt, completion or other dataset fields before batching, validation or model training. This browser-first tool highlights averages, percentiles, empty records and the longest examples so you can spot risky outliers early.

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Read locally in your browser only

This tool does not upload files to a server.

Analysis options

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Records

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Avg chars

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Median chars

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P95 chars

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Analyze prompt, response or text-field lengths before model training and batching.

Summary JSON

Longest examples

Review the largest records to spot outliers before building prompts or batches.

No analysis results yet.

Why length analysis matters

Training and evaluation workflows can be distorted by unusually long, unusually short or empty text records. A quick length pass helps you catch those problems before they become batching issues, token-cost surprises or weak examples in the final dataset.

This tool works best as a review layer after cleanup and schema mapping, when you want to understand how the text itself behaves.

  • Review average, median and p95 character counts.
  • Spot empty records and oversized outliers quickly.
  • Focus on one field or combine all string fields when needed.

How to use the results

Length statistics are most useful when they lead to a decision. If the longest examples are clearly off-task, duplicated or malformed, you can clean them before batching or splitting the data. If the distribution looks wide but valid, you can adjust downstream token budgets accordingly.

That makes this tool a good bridge between raw data cleanup and practical training preparation.

How to use

  • Paste CSV, JSON or JSONL content, or import a local dataset file.
  • Choose the input format and optionally specify a text field such as `prompt`, `completion` or `answer`.
  • Run the analysis to review length stats, outlier rows and a downloadable summary.

Example

Input

[{"prompt":"Short text"},{"prompt":"A much longer prompt that keeps going for many more words"}]

Output

Records: 2 | Avg chars: 33 | Longest example highlighted in the outlier list

Privacy note

Dataset parsing and text-length analysis happen locally in your browser. Imported CSV, JSON and JSONL files are never uploaded.

Recommended Guides

Start with these higher-value walkthroughs to understand the workflow around this tool, not just the button clicks.

FAQ

Can I analyze one specific field such as `prompt` or `answer`?

Yes. Enter a field name to focus the analysis, or leave it empty to use the first detected text field.

What does p95 mean here?

It is the 95th percentile character length, which helps you understand how large the long tail of the dataset is without focusing only on the single longest row.

Does this estimate model tokens exactly?

No. It measures character and word lengths as a lightweight pre-check, not tokenizer-specific token counts.

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