Free Online Developer Tools

JSON formatter, QR code generator, Base64 encoder — free developer utilities that run entirely in your browser. No data leaves your device.

100% client-side. Your data never leaves your browser.

QR Code Generator

Create QR codes instantly from URLs, text, or contact info. Download as PNG or SVG.

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JSON Formatter

Format, validate, and minify JSON data with syntax highlighting and error detection.

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Base64 Encoder

Encode and decode Base64 strings. Supports text and file input.

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Browser-Based Developer Utilities

Developers frequently need quick utilities — formatting a JSON response, generating a QR code for a test, encoding a file to Base64. Most online tools require pasting sensitive data into a form that transmits it to a remote server. PDFJolt's developer tools process everything in your browser, so API keys, tokens, and private data never leave your device.

The JSON formatter supports validation with line-level error reporting, pretty-printing with configurable indentation, and minification. The QR code generator supports URLs, plain text, WiFi credentials, and vCards with full color customization and error correction settings. The Base64 encoder handles both text and binary files with full UTF-8 support.

Frequently Asked Questions

Is my JSON data safe when using the formatter?

Yes. PDFJolt's JSON formatter runs entirely in your browser. Your data is never sent to any server — all parsing, formatting, and validation happens locally on your device.

What QR code types are supported?

You can generate QR codes for URLs, plain text, WiFi credentials, and email links. Download as PNG or SVG with customizable colors, sizes, and error correction levels (L, M, Q, H).

Can I encode files to Base64?

Yes. The Base64 tool supports both text input and file input. You can encode any file (images, documents, etc.) to Base64 or decode Base64 strings back to their original format.