Miscellaneous tools
Handy browser-based tools that don't fit neatly into one category — barcodes, ISBN lookup, size converters, gear ratios, and weather unit conversions.
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Barcode Generator
Generate Code 128 barcodes for any text or number string. Download as PNG — 100% client-side.
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ISBN Validator
Validate ISBN-10 and ISBN-13 numbers, check the checksum digit, and convert between formats.
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License Plate Format by Country
Look up license plate formats, character rules, and example plates for countries worldwide.
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ZIP / Postal Code Format by Country
Look up postal code formats and regex patterns for countries worldwide. Validate any postal code.
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Bra Size Converter
Convert bra sizes between US, UK, EU, FR/BE, AU/NZ, and IT sizing systems instantly.
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Shoe Size Converter
Convert shoe sizes between US, UK, EU, and CM for men and women across all major standards.
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Ring Size Converter
Convert ring sizes between US, UK, EU (circumference), and JP standards, or measure from diameter.
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Hat Size Converter
Convert hat sizes between US, UK, and EU standards, or calculate your size from head circumference.
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Gear Ratio Calculator
Calculate gear ratio, output RPM, torque multiplication, and speed from gear teeth counts.
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Weather Unit Converter
Convert weather measurements: temperature, pressure, wind speed, visibility, and dew point between units.
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Why use browser-based miscellaneous tools?
These tools run entirely inside your browser — no files are uploaded, no data is logged, and no account is required. Whether you're generating a barcode, converting clothing sizes across international standards, or calculating gear ratios for a mechanical project, everything happens locally on your device.
Frequently Asked Questions
- Are these tools free?
- Yes — all tools on this page are completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All processing runs in JavaScript inside your browser. Nothing is sent to any server.
- Do they work on mobile?
- Yes. Every tool is mobile-first and works on iPhone Safari and Android Chrome.