Free Online Developer Tools

Fast, private, and reliable browser-based utilities for developers. No data leaves your device — everything runs 100% client-side.

Why Choose DevHelper Tools?

Privacy First

All tools run entirely in your browser. Your data is never sent to any server, ensuring complete privacy and security.

Lightning Fast

No server round-trips. Instant results powered by modern browser APIs. Works offline after the first load.

Always Free

All tools are completely free to use with no sign-up required. No usage limits, no paywalls.

Multi-Language

Available in 6 languages including English, Chinese, Japanese, Spanish, French, and German.

Available Tools

Encoding

🔐

Base64 Encoder / Decoder

Encode and decode text or files using Base64 encoding

🔗

URL Encoder / Decoder

Encode and decode URL components and full URLs

Unicode Converter

Convert text to Unicode code points and vice versa

Crypto

🔑

AES Encryption / Decryption

Encrypt and decrypt text using AES encryption

Time

🕐

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates

⏱

Cron Expression Editor

Build, validate and explain cron expressions

Format

{}

JSON Formatter / Validator

Format, minify and validate JSON data

🗄

SQL Formatter

Format and beautify SQL queries

XML Formatter

Format, minify and validate XML documents

⚙

YAML ↔ Properties Converter

Convert between YAML and Java .properties format

Dev

Regex Tester

Test and debug regular expressions with real-time highlighting

Visual

📱

QR Code Generator

Generate and scan QR codes instantly

Frequently Asked Questions

Is it safe to use these tools with sensitive data?

Yes! All processing happens locally in your browser. Your data never leaves your device. We do not collect, store, or transmit any data you enter into our tools.

Do I need to create an account?

No. All tools are freely available without registration. Simply open the tool you need and start using it immediately.

Do the tools work offline?

Yes. Once the page is loaded, all tools work without an internet connection since they run entirely in your browser.

What browsers are supported?

DevHelper Tools works on all modern browsers including Chrome, Firefox, Safari, and Edge. We recommend using the latest version for the best experience.

How is this different from other online dev tools?

Unlike most online tools that send your data to a server for processing, our tools run 100% client-side. This means your sensitive data (passwords, API keys, private code) stays on your machine.