Fix broken CSV, JSON, tokens, bytes, and Markdown without leaving the browser.
Browser tools for fixing CSV encoding, JSON errors, AI token costs, and multilingual byte limits.
Tools
Browser-based tools that fix practical data and text problems.
CSV Encoding Fixer
Diagnose garbled CSV text and export an Excel-friendly UTF-8 BOM file.
JSON Error Doctor
Find JSON error positions, explain common causes, and format or minify valid JSON.
AI Token & Cost Calculator
Estimate token counts and costs for Korean, English, and Japanese prompts.
Byte / Character Counter
Count characters, bytes, lines, and SEO title or meta description lengths.
Markdown Table Generator
Convert CSV or TSV into a GitHub-friendly Markdown table.
Common problems
Japanese CSV Mojibake Fix
How to fix Japanese CSV mojibake caused by Shift-JIS, UTF-8, Excel CSV imports, and encoding mismatches.
Updated 2026-05-15
JSON Unexpected token Error
How to debug JSON Unexpected token errors by checking the token, position, quotes, commas, and real API response body.
Updated 2026-05-15
Unexpected token < in JSON at position 0
Why Unexpected token < in JSON at position 0 usually means your API returned HTML, not JSON, and how to debug it.
Updated 2026-05-15
Practical guides
CSV / Excel Encoding Center
A practical hub for fixing garbled CSV files in Excel, UTF-8 BOM issues, Korean CP949 files, and Japanese Shift-JIS mojibake.
Updated 2026-05-15
AI Token Count vs Character Count
The difference between AI token count and character count, and how to estimate prompt cost for English, Korean, and Japanese text.
Updated 2026-05-15