Free tools that run in your browser
Quembo is a growing set of small, fast utilities — for developers and for everyone else. Format JSON, generate a password or a QR code, convert units, count words, diff text. Every tool runs entirely in your browser: what you paste never reaches a server, nothing is uploaded, and there is no telemetry.
16 tools · 5 categories · no account · no tracking ads
Developer
View all →Everyday tools for working with code and data formats.
JSON Formatter
Pretty-print and validate JSON, with the error line reported.
Open →Base64 Encode / Decode
Convert text to Base64 and back, with proper UTF-8 support.
Open →JWT Decoder
Read a JWT's header and payload. The signature is not verified.
Open →UUID v4 Generator
Generate random UUID v4 identifiers, one at a time or in bulk.
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Generators
View all →Create passwords, codes, placeholder text and hashes.
Password Generator
Build a strong random password with the character types and length you choose.
Open →QR Code Generator
Turn any text or link into a QR code and download it as a PNG.
Open →Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences or words.
Open →Hash Generator
Compute MD5, SHA-1, SHA-256 and SHA-512 digests of any text.
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Converters
View all →Convert between formats, encodings, cases and color models.
RegEx Tester
Test a regular expression against sample text with live match highlighting.
Open →URL Encode / Decode
Percent-encode text for URLs, or decode an encoded string back.
Open →Color Converter
Convert a color between HEX, RGB and HSL, with a live preview.
Open →Case Converter
Rewrite text as camelCase, snake_case, kebab-case, PascalCase and more.
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Calculators
View all →Work out ages and convert units as you type.
Text
View all →Count, measure and compare text.