ToolsGuru

Developer Tools

Professional development utilities for coding, debugging, and optimization.

11 tools available

File Diff

Popular

Compare two files side by side with syntax highlighting and detailed change visualization.

Updated 2 days ago

Base64 Encoder/Decoder

Encode and decode Base64 strings, perfect for data transmission and storage.

Updated 5 days ago

Debugging & Testing

Popular

Comprehensive debugging toolkit with regex tester, JSON validator, JWT decoder, API testing, and GraphQL IDE.

Updated today

Formatters & Converters

Popular

Powerful formatting and conversion toolkit with Prettier code formatter, Markdown editor, and CSV to JSON converter.

Updated today

Text Editor

Popular

Advanced online text editor with Monaco technology. Syntax highlighting for 20+ programming languages including JavaScript, Python, Java, C++, and more.

Updated today

UUID Generator

Generate random UUID v4 identifiers in bulk. Copy single or multiple UUIDs instantly for databases, APIs, and testing.

Updated today

Hash Generator

Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text. All hashing happens locally in your browser.

Updated today

URL Encoder/Decoder

Encode and decode URLs and query strings. Handle special characters, spaces, and unicode safely for web development.

Updated today

Timestamp Converter

Convert Unix timestamps to human-readable dates and back. Supports seconds, milliseconds, and multiple timezones.

Updated today

HTML Entity Encoder

Encode and decode HTML entities like &, <, and " to safely display code and special characters on web pages.

Updated today

Color Converter

Popular

Convert colors between HEX, RGB, HSL, and CMYK with a live color picker and instant preview.

Updated today

About our developer tools

Developers lose surprising amounts of time to small, repetitive jobs: decoding a Base64 payload from an API log, generating a batch of UUIDs for seed data, checking why a URL query string breaks, or converting a Unix timestamp buried in a stack trace. ToolsGuru's developer tools collect these everyday utilities in one place, so you can get an answer in seconds instead of writing a throwaway script or hunting through documentation.

Most tools on this page run in your browser, so what you paste into the encoders, hashers, generators, formatters and file diff is not sent to ToolsGuru. A few tools make network requests: the Debugging & Testing API and GraphQL testers send requests to the URL you enter, the Carbon code screenshot tool sends your code to carbon.now.sh, and the Sitemap Extractor can fetch the URL you enter. Avoid pasting secrets into those. There are no accounts, no rate limits, and no installs; the tools work the same on your work laptop, a locked-down corporate machine, or your phone.

The collection covers encoding and decoding (Base64, URL, HTML entities), identifiers and integrity (UUID generation, SHA hashing), time handling (Unix timestamp conversion across timezones), color format conversion for front-end work, plus heavier utilities like the file diff viewer, Monaco-powered text editor, regex and JSON debugging suite, and code formatters.

Why choose ToolsGuru

Mostly client-side

Encoders, hashers, generators and formatters run in your browser. The few tools that make requests are named in the FAQ.

Zero setup

No CLI installs, no npm packages, no sign-ups. Open a page and get the answer.

Built for real workflows

Bulk generation, copy buttons, downloads, and edge-case handling everywhere.

Works offline-friendly

Once a page loads, most tools keep working without a connection.

Frequently asked questions

Is it safe to paste API keys or tokens into these tools?

For most of them, yes. The encoders, hash and UUID generators, formatters, regex and JWT tools and file diff run in your browser with JavaScript, so what you paste is not sent to ToolsGuru; you can confirm this in your browser's Network tab. The exceptions: the API and GraphQL testers send requests to the URL you enter (including any headers or tokens you add), the Carbon code screenshot tool sends your code to carbon.now.sh, and the Sitemap Extractor's URL mode requests the URL you enter. The page itself also loads analytics and ads. As always, rotate any credential you believe may have been exposed.

Do these tools have usage limits?

No. Because processing happens on your own machine, there are no quotas, rate limits, or paid tiers. Generate 5,000 UUIDs or hash a large document as often as you need.

Which hash algorithms are supported?

The hash generator supports SHA-1, SHA-256, SHA-384, and SHA-512 via the browser's built-in Web Crypto API, which is the same cryptography implementation your browser uses for HTTPS.

Can I use these tools on mobile?

Yes — every tool is responsive and works in mobile browsers. Heavier tools like the text editor and file diff work best on larger screens, but encoders, generators, and converters are fully usable on a phone.