Useful tools, right in your browser.

blah is a free one-stop toolbox for quick tasks: passwords, IDs, conversions, text cleanup, developer formats, and everyday calculations. No signup, no accounts, no uploads. Every tool runs locally in your browser, so your input never leaves your device.

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Random Live

Password generator

Generate strong random passwords with cryptographically secure randomness.
Converters Live

Unit converter

Convert length, mass, temperature, volume, speed, and data sizes exactly.
Random Live

UUID v4 generator

Generate random UUID v4 identifiers, one or in bulk.
Images & files Live

QR code generator

Turn a URL or short text into a QR code image you can download.
Converters Live

Timestamp converter

Convert Unix timestamps and date-times in both directions, UTC and local.
Developer Live

JSON formatter and validator

Format, minify, and validate JSON with line and column error reporting.
Developer Live

Base64 encoder and decoder

Encode text to Base64 or decode Base64 back to text.
Text Live

Word and character counter

Count words, characters, lines, and paragraphs as you type.
Text Live

Case converter

Switch text between upper, lower, title, camel, snake, kebab, and more.
Random Live

Random number generator

Pick random numbers in a range, with integers or decimals, one or in bulk.

Browse by category

Random

Generators and pickers for passwords, IDs, numbers, and more.
Text

Count, convert, and clean up text in the browser.
Converters

Units, time, sizes, and formats with exact conversion factors.
Developer

Formatters, encoders, and references for everyday dev work.
Calculators

Dates, percentages, and everyday number crunching.
Images & files

Codes, images, and file utilities that run locally.

The short version

Free to use, no account, no upsell.
Your input stays in your browser. Nothing is uploaded, stored, or logged.
Every tool states its limits and how it handles your data.