Every small tool you keep looking for

Format, convert, encode, calculate and generate — free, instant, and private. Nothing you type ever leaves your browser.

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23 tools

Completely private

Every tool runs client-side. Your input is never sent to a server, logged or stored.

Instantly fast

No sign-up, no upload, no waiting. Pages load in milliseconds and results appear as you type.

Works offline

Install ToolBox Hub as an app and keep using your tools with no connection at all.

Text & String

Transform, count, compare and clean up text.

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Case Converter

New

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

Works offline

Word & Character Counter

New

Live word, character, sentence and paragraph counts with reading time.

Works offline

Text Diff Checker

New

Compare two texts and see exactly what changed, by line, word or character.

Works offline

Remove Duplicate Lines

New

Strip repeated lines from a list — or keep only the ones that repeat.

Works offline

URL Slug Generator

New

Turn a title into a clean URL slug, with correct German transliteration.

Works offline

Encoding & Decoding

Encode, decode and hash data in common web formats.

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Base64 Encoder & Decoder

New

Convert text and files to and from Base64, with full Unicode support.

Works offline

URL Encoder & Decoder

New

Percent-encode and decode URLs, query values and form data.

Works offline

Hash Generator

New

Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests.

Works offline

JWT Decoder

New

Read a JSON Web Token's header, payload and claims — without ever verifying it.

Works offline

HTML Entity Encoder & Decoder

New

Convert text to HTML entities and back, named or numeric.

Works offline

Data & Formats

Format, validate and convert structured data.

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JSON Formatter & Validator

New

Pretty-print, minify and validate JSON with precise error locations.

Works offline

Design & Color

Pick colours, build gradients and check contrast.

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Color Converter

New

Convert between HEX, RGB and HSL with a live preview and contrast check.

Works offline

Colour Contrast Checker

New

Check a colour pair against WCAG 2.1, and get the nearest passing colour.

Works offline

CSS Box Shadow Generator

New

Build a layered CSS box-shadow visually, with a live preview on light and dark.

Works offline

Calculators

Everyday maths, finance and unit conversions.

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Percentage Calculator

New

Work out percentages, increases, decreases and reverse totals.

Works offline

BMI Calculator

New

Body mass index in metric or imperial, with the healthy range for your height.

Works offline

Unit Converter

New

Convert length, weight, temperature, volume, area, speed and data.

Works offline

Tip & Bill Splitter

New

Work out the tip and split the bill — evenly, or by what each person ordered.

Works offline

Generators

Generate passwords, IDs, codes and placeholder content.

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Password Generator

New

Create strong, random passwords with a live strength estimate.

Works offline

UUID Generator

New

Generate UUID v4 and time-ordered v7 identifiers in bulk.

Works offline

Lorem Ipsum Generator

New

Generate placeholder paragraphs, sentences, words or list items.

Works offline

QR Code Generator

New

Create QR codes for links, text, Wi-Fi, email and phone numbers.

Works offline

Quiz & Viral

Quick tests and quizzes worth sharing.

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Reaction Time Test

New

Measure how fast you react, over several attempts.

Works offline