Browse by category
69 tools, all free, all in your browser. Pick a category, or search above.
LLM 2 tools
LLM cost calculator · Tokens/sec simulator
Finance 13 tools
Mortgage · Compound interest · Retirement
Health 8 tools
BMI · BMR & calories · Macros
Math 7 tools
GPA · Quadratic solver · Mean & SD
Convert 10 tools
Length · Currency · Cups ↔ grams
Time 2 tools
Age · Days between dates
Everyday 5 tools
Recipe scaler · Paint · Concrete
File converters 10 tools
CSV ↔ JSON · Markdown → HTML · Image converter
Dev tools 12 tools
JSON formatter · Base64 · Text diff
File converters
Change formats without uploading anything — your files never leave your browser.
CSV ↔ JSON
Drop a .csv or .json file here, or click to choose
Result appears here.
JSON ↔ YAML
Result appears here.
Markdown → HTML
HTML appears here.
Preview appears here.
CSV → Markdown table
Result appears here.
Image converter, resize & compress
Drop an image here, or click to choose
Output format
Max width (px)
Quality (0–1)
Text case converter
XML ↔ JSON
CSV → SQL INSERT
File SHA-256 hash
Drop a file here, or click to choose
Image → Base64
Drop an image here, or click to choose
Dev tools
JSON, encoders, diffs and text tools for daily dev work.
JSON formatter & validator
Output appears here.
Base64
URL encode / decode
Regex tester
Unix timestamp
UUID, password & SHA-256
Token estimator
Color converter
Text diff
Word counter
Sort & dedupe lines
JSON → TypeScript
No tools match “” — try a different word.