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Free Developer Tools

Developers spend a surprising amount of time on small repetitive tasks: formatting a JSON blob, encoding a string to Base64, checking what's inside a JWT, or generating a batch of UUIDs for test data. These tools handle all of that in your browser with zero setup — no npm install, no Docker, no account.

All 20 tools below are privacy-safe: because everything runs locally, you can paste real tokens, keys, and payloads without worrying about server-side logging.

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JSON Formatter

Pretty-print, validate and minify JSON with syntax highlighting.

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Base64 Encode / Decode

Encode strings or files to Base64 or decode Base64 back to text.

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URL Encode / Decode

Percent-encode URLs or decode percent-encoded strings.

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HTML Encode / Decode

Escape HTML entities or unescape them back to characters.

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Regex Tester

Test regular expressions live with match highlighting and capture groups.

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Password Generator

Generate strong random passwords with strength meter and passphrase mode.

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Hash Generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text or files.

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Color Converter

Convert between HEX, RGB, HSL, HSV, CMYK with palette generator.

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CSS Minifier

Minify CSS to reduce file size or beautify compressed CSS.

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Binary Right Shifter

Logical or arithmetic right shift on binary numbers — unlimited, self-length or truncated.

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Hex to Binary

Convert hexadecimal to binary with optional 0b prefix, byte padding and group spacing.

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QR Code Generator

Create QR codes for URLs, Wi-Fi, email and text. Custom colors and size, PNG/SVG download.

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QR Code Reader

Decode a QR code from an image or your camera. URLs, Wi-Fi, contacts and text.

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Unix Timestamp Converter

Convert epoch seconds / milliseconds to a human date and back. Live current timestamp.

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UUID Generator

Bulk-generate cryptographically random v4 UUIDs with uppercase, no-dash and brace options.

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Diff Checker

Compare two texts side by side with added / removed lines highlighted. Ignore case & whitespace.

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JWT Decoder

Decode a JSON Web Token header and payload, with readable expiry / issued-at. Decoding only.

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JSON ↔ CSV ↔ YAML

Convert structured data between JSON, CSV and YAML in any direction, instantly.

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Code Formatter & Minifier

Beautify or minify JSON, JavaScript, CSS, HTML, XML and SQL right in your browser.

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Invoice Generator

Create a professional PDF invoice online. Fill in details and line items — download instantly, no sign-up.

Frequently Asked Questions

Are these developer tools safe for sensitive data? expand_more

Yes. All processing happens locally in your browser — no data is transmitted to any server. This makes them safe for encoding tokens, hashing passwords for testing, or formatting proprietary JSON payloads.

Does the JWT Decoder verify signatures? expand_more

No. The JWT Decoder decodes and displays the header and payload of a JWT without verifying the signature. It is a read-only inspection tool, not a validation tool.

What hashing algorithms does the Hash Generator support? expand_more

The Hash Generator supports MD5, SHA-1, SHA-256 and SHA-512. You can hash plain text or upload a file to generate its hash for integrity checking.

Can I format minified JSON with the JSON Formatter? expand_more

Yes. Paste any valid minified JSON and the formatter will pretty-print it with configurable indentation. It also validates the JSON and reports errors with line numbers.