Free Online Tools for Everyone

Format JSON, encode Base64, convert timestamps, and more. Fast, free, and no signup required.

About Online Toolbox

🔒

100% Client-Side

All tools run entirely in your browser. No data is uploaded to any server. Your inputs stay private and secure.

⚡

Lightning Fast

No waiting for server responses. Every operation completes in milliseconds because it happens locally on your device.

📱

Works Everywhere

Fully responsive design that works on desktop, tablet, and mobile. Install as a PWA for an app-like experience.

💰

Forever Free

No subscriptions, no premium tiers, no ads cluttering your workspace. Just clean, fast tools that get the job done.

Need a tool you don't see? Let us know — we're always adding new utilities based on user feedback.

All Tools

9 tools

JSON Formatter

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

Client-Side Data Format Ctrl+Enter Format
Paste or type your JSON here. It will be automatically formatted as you type.
Output
Formatted JSON will appear here...

Base64 Encoder / Decoder

Encode plain text to Base64, or decode Base64 strings back to original text. Supports UTF-8.

Client-Side Encoding UTF-8 Support
Output
Result will appear here...

Timestamp Converter

Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.

Client-Side Time Tools UTC / Local
--
Conversion Result
Enter a timestamp above...

Word Counter

Count characters, words, sentences, and paragraphs in real time as you type.

Client-Side Text Tools Real-Time
0
Characters
0
Words
0
Sentences
0
Paragraphs
0s
Read Time

QR Code Generator

Generate QR codes for URLs, text, emails, phone numbers — anything. Download as PNG image.

Client-Side Utility PNG Export
QR Code Preview

UUID Generator

Generate random UUID v4 identifiers. Generate one or multiple at once.

Client-Side Utility RFC 4122
Generated UUID(s)
Click Generate to create UUID(s)

Hash Calculator

Calculate MD5, SHA-1, SHA-256, and SHA-512 hashes using Web Crypto API. 100% client-side.

Client-Side Encoding Web Crypto API
Hash Results
MD5--
SHA-1--
SHA-256--
SHA-512--

URL Encoder / Decoder

Encode special characters in URLs for safe transmission, or decode percent-encoded strings.

Client-Side Encoding RFC 3986
Output
Result will appear here...

Regular Expression Tester

Test regex patterns against your text in real time. See all matches highlighted instantly.

Client-Side Text Tools Real-Time
Matches
Matches will appear here...