Fast developer tools that run in your browser.
A suite of fast utilities for everyday engineering: formatters, encoders, generators, and converters. No signup required, zero bloat, and run directly on your device.
Formatters & validators
JSON Formatter
Format, minify, and copy JSON with instant feedback.
XML Formatter
Format, minify, and validate XML with clean output.
Config Formatter
Format, align, and organize config files (.env, properties).
YAML / JSON Converter
Convert between YAML and JSON. Copy or download results.
Date Formatter
Convert dates between ISO, Unix, UTC, and readable formats.
Generators
UUID / ULID Generator
Generate UUID v4 or ULID identifiers for databases and APIs.
Hash Generator
Generate SHA-256, SHA-1, or MD5 hashes for integrity checks.
QR Code Generator
Create QR codes for URLs, documents, and contact info.
Barcode Generator
Generate barcodes (CODE128, EAN-13, and more) instantly.
Random Generator
Generate mock user data, passwords, and JSON arrays for testing.
Encoders & decoders
Base64 Encoder
Encode or decode Base64 for payloads, tokens, and debugging.
JWT Decoder
Decode JSON Web Tokens to inspect header and payload safely.
URL Encode / Decode
Safely encode or decode URLs and the parameters in a query string.
Case Converter
Convert text to UPPERCASE, lowercase, Title, or Sentence case.
Text tools & converters
Text Cleaner
Remove extra spaces, normalize line breaks, and trim text.
Character Counter
Count words, characters, sentences, and paragraphs.
CSV / JSON Converter
Convert between CSV and JSON. Copy or download results.
Image Converter
Convert images between PNG, JPG, WebP, GIF, and BMP formats.
PDF to Word
Convert PDF documents to editable Word (DOCX) files.
Frequently asked questions
Are the Defolt Labs developer tools free?
Yes. Every tool is free with no account and no signup. Open one and use it immediately.
Do these tools upload my data?
Most run entirely client-side in your browser, so nothing is uploaded. The exceptions are Image Converter and PDF to Word, which process the file server-side without persisting it.
What can I use these tools for?
Formatting JSON, XML and YAML, encoding/decoding Base64, URL and JWT, generating UUIDs, hashes, QR and barcodes, cleaning text, and converting CSV.
Do the tools work on mobile?
Yes. All tools are responsive and adapt cleanly to phone, tablet, and desktop screens.