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Developer Tools

Free online tools built for developers — format, encode, decode, test, and generate code in seconds. All tools run in your browser, no sign-up required.

🆓 All Free ⚡ No Sign-up 🔒 100% Private 💻 10 Tools

10Dev Tools

0Sign-ups needed

100%Browser-based

💻 All Developer Tools

10 tools available

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JSON Formatter & Validator

Beautify, minify, and validate JSON data instantly. Syntax highlighting, error detection, and one-click copy.

JSON Formatter Validator

Base64 Encoder / Decoder

Encode text or files to Base64 and decode Base64 strings back. Supports URL-safe Base64 and image preview.

Base64 Encode Decode

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text or files. Compare hashes and verify file integrity.

MD5 SHA-256 Hash

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URL Encoder / Decoder

Encode special characters in URLs and decode percent-encoded strings. Essential for API development and web scraping.

URL Encode Decode

Regex Tester

Test and debug regular expressions in real-time. Highlights matches, shows capture groups, and supports all JS regex flags.

Regex Pattern Test

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Code Minifier

Minify HTML, CSS, and JavaScript to reduce file size. Shows size savings percentage. One-click copy of minified output.

HTML CSS JavaScript

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Diff Checker

Compare two blocks of text or code side by side. Highlights added, removed, and changed lines with colour coding.

Diff Compare Text

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UUID Generator

Generate v1, v4, and v5 UUIDs instantly. Bulk generation, uppercase/lowercase toggle, and one-click copy for each UUID.

UUID GUID v4

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Cron Expression Parser

Parse and explain cron expressions in plain English. Shows next 10 execution times and validates cron syntax instantly.

Cron Scheduler Parser

Markdown Editor

Live Markdown editor with real-time HTML preview. Export to HTML, copy rendered output, and use a toolbar for quick formatting.

Markdown Preview HTML

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❓ Frequently Asked Questions – Developer Tools

Are all developer tools free to use?

Yes — every tool on ToolNex is completely free. There are no premium tiers, no credits system, and no sign-up required. All 10 developer tools can be used unlimited times without any cost.

Is my code or data safe when using these tools?

Absolutely. All tools run entirely in your browser using JavaScript. Your code, text, and data are never sent to any server. Everything is processed locally on your device, making these tools 100% private and safe for sensitive code.

Do the tools work without an internet connection?

Once the page is loaded in your browser, most tools will continue to work even if you go offline, since all processing happens locally. Tools that use external CDN libraries (like the Markdown editor) may need the initial page load to complete while connected.

Which tool should I use to compare two files?

Use the Diff Checker tool — paste the original text in the left panel and the modified version on the right. It highlights added lines in green, removed lines in red, and changed lines in yellow, making it easy to spot differences in code, config files, or any text.

Developer Tools

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❓ Frequently Asked Questions – Developer Tools