About ByteUtilities

// free developer tools · browser-based · no signup · no data collection

What is ByteUtilities?

ByteUtilities is a free collection of online developer tools that run entirely in your browser. Whether you need to format a JSON response, decode a JWT token, test a regular expression, generate a secure password, or convert between color formats — ByteUtilities has a dedicated tool for it, available instantly without creating an account.

The site was built out of frustration with existing online tools that require signups, show intrusive ads, impose rate limits, or — most concerning — process your sensitive data on their servers. A tool that asks you to paste your JWT token or API keys into a form and submit it to a server is a security risk. Every tool on ByteUtilities processes data locally using your browser's own JavaScript engine.

Our tools

We currently offer 12 free developer utilities, with more in active development:

JSON FormatterFormat, validate, lint and minify JSON

Base64 EncoderEncode/decode text and files to Base64

URL EncoderEncode, decode and parse URLs

Regex TesterLive match highlighting with capture groups

JWT DecoderDecode tokens and verify HMAC signatures

UUID GeneratorGenerate v1 and v4 UUIDs in bulk

Password GeneratorCryptographically secure random passwords

Hash GeneratorMD5, SHA-1, SHA-256, SHA-384, SHA-512

Timestamp ConverterUnix timestamps to human-readable dates

Color ConverterHEX, RGB, HSL, CMYK conversion

Diff CheckerLine-by-line text comparison

Word CounterWords, characters, reading time, keyword density

Upcoming tools include an XML to JSON Converter, JSON to Table viewer, and a Cron Expression Builder.

How the tools work

Every tool on ByteUtilities is built with plain HTML, CSS, and JavaScript. There is no backend server processing your data. When you paste text into any tool, the processing happens inside your browser tab using JavaScript APIs like JSON.parse(), the Web Crypto API, and native browser functions.

This architecture means:

Your data never leaves your device — no server logs, no data collection
Tools work offline once the page is loaded
Results are instantaneous — no network round trips
No rate limits — process as much data as you need
Safe to use with sensitive data: API keys, passwords, private tokens

Privacy and advertising

ByteUtilities displays Google AdSense advertisements to cover hosting and domain costs. These ads may use cookies to show relevant content based on your browsing history. You can opt out of personalised advertising at Google Ads Settings.

We use Google Analytics to understand anonymous aggregate traffic patterns — which tools are most used, which pages people visit, and where traffic comes from. No personally identifiable information is collected through analytics. Your tool inputs are never logged or transmitted.

For full details, see our Privacy Policy.

Accuracy and limitations

All tools are built to follow their respective specifications: JSON tools follow RFC 8259, URL encoding follows RFC 3986, hash functions follow NIST standards, and UUID generation follows RFC 4122. The regex tester uses JavaScript's native RegExp engine — results may differ slightly from Python's re module or other regex flavours.

While we test all tools carefully, ByteUtilities is provided as-is without warranty. For production-critical operations, always verify results independently.

Contact

Found a bug? Have a tool request? We'd genuinely like to hear from you.

Emailhello@byteutilities.com

Bugsbugs@byteutilities.com

Websitebyteutilities.com