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Online Tools

Free online tools · Everything runs locally in your browser

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Formatting

7

Format and minify JSON, XML, SQL, HTML, CSS and JavaScript online. Automatic indentation, syntax validation and error positions, all processed locally in your browser.

Encoding & Crypto

7

Encode and decode Base64, URLs and HTML entities, inspect JWTs, and compute MD5, SHA and HMAC hashes or run AES encryption. Keys and content never leave your browser.

Conversion

6

Convert timestamps and dates, change number bases, translate colour formats, convert units and parse cron expressions. Results update as you type, with nothing uploaded.

Text

7

Diff two texts, count words, test regular expressions, deduplicate and sort lines, switch naming conventions, convert Chinese scripts or preview Markdown. Built for logs, code and long documents.

Generators

5

Generate UUIDs, ULIDs and NanoIDs in bulk, create QR codes, strong passwords, mock data as JSON, CSV or SQL, and placeholder text. Everything is produced locally and never recorded.

Web & Network

6

Parse URL structure, analyse user agents, look up HTTP status codes and MIME types, generate .gitignore files, and inline images as Base64. Quick answers, nothing to sign up for.

Popular tools

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JSON Formatter

Formatting

Format, minify and validate JSON, pinpointing syntax errors to an exact line and column. Optional key sorting; runs in your browser.

Timestamp Converter

Conversion

Convert Unix timestamps into readable dates and back, with seconds and milliseconds told apart, a time zone picker and batch mode. Runs in your browser.

Password Generator

Generators

Generate strong random passwords with a live entropy readout, so strength becomes a number you can compare. Passwords stay in memory, never uploaded.

QR Code

Generators

Turn text or a link into a QR code as you type, downloadable as a PNG or a vector SVG. The encoding happens in your browser, never on a server.

Unit Converter

Conversion

Convert between units of length, weight, temperature, volume and more, seeing one value in every unit of its category at once, all in your browser.

Image to Base64

Web & Network

Convert an image to Base64 or a data URL by dropping, choosing or pasting it. Resize and switch format, all locally — nothing is ever uploaded.

piapia123 collects 38 handy online tools covering formatting, encoding and crypto, conversion, text processing, generators and web lookups — useful for writing, office work, studying and building alike. Every tool runs directly in your browser — no uploads, no sign-up, and it works offline.