Andergrove Software
Free online tools for developers and everyday tasks.
Fast, private browser tools that need no account — validate JSON, decode JWTs, generate passwords and QR codes, convert units and more. Everything runs locally in your browser, so nothing you paste ever leaves your device.
Popular tools
View all 44 tools →-
JSON Validator
Validate and pretty-print JSON with clear error messages that point at the problem.
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Base64 Encoder / Decoder
Encode and decode Base64 text and files, with Unicode- and URL-safe options.
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JWT Decoder & Encoder
Decode a JSON Web Token's header and payload, check expiry, and verify the signature.
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Password Generator
Create strong, random passwords with adjustable rules and a live strength meter.
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QR Code Generator
Turn any link or text into a sharp QR code and download it as PNG or SVG.
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Regex Tester
Test regular expressions with live match highlighting and capture groups.
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Diff Checker
Compare two versions of text and see exactly what was added and removed.
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Word & Character Counter
Count words, characters, sentences and reading time live as you type.
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Image Compressor & Resizer
Shrink and resize JPG, PNG and WebP images right in your browser — nothing is uploaded.
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Unix Timestamp Converter
Convert Unix timestamps to dates and back, in both local time and UTC.
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Unit Converter
Convert length, weight, temperature and volume between metric and imperial.
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Percentage Calculator
Work out percent of a number, one number as a percent of another, and percentage change.
Latest writing
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Hello, Andergrove
Why Andergrove Software exists, and how this lean static site is built and maintained.
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IBM DataPower Gateway — Management APIs
A practical guide to DataPower's REST management API: structure, key resources, and curl examples.
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IBM DataPower Gateway — Docker for Local Development
Run IBM DataPower Gateway locally as a free Docker service for development, with the Web UI enabled.