PanDev Tools

Free developer tools

Format JSON, decode JWTs, test regular expressions, generate hashes, UUIDs and passwords, and build QR codes from one place. Every tool runs locally in your browser, so the tokens, keys and payloads you paste are never sent to a server. No sign-up and no rate limits.

15 tools. All of them run on your device, and nothing is uploaded.
JSON Formatter & ValidatorFormat, minify and validate JSON with exact error locations, sorted keys and a collapsible tree view.Popular Base64 Encode / DecodeEncode text or files to Base64 and decode it back, with full UTF-8 support and a URL-safe option. URL Encode / Decode & ParserPercent-encode or decode text, and break any URL into parts with an editable query-parameter table. Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files and verify checksums. UUID & Random ID GeneratorGenerate UUID v4 and time-ordered v7 in bulk, plus nanoid-style random strings with custom alphabets. Password GeneratorCreate strong random passwords or memorable passphrases with an entropy meter, using secure randomness. QR Code GeneratorCreate QR codes for links, Wi‑Fi, contacts, email, SMS and more, with colors and a logo; download PNG or SVG. QR Code ScannerScan QR codes with your camera or from an image or screenshot, right in the browser. Color Converter & Contrast CheckerConvert HEX, RGB, HSL and OKLCH colors, check WCAG contrast between two colors and build shade scales. Unix Timestamp ConverterConvert Unix epoch timestamps to dates and back, in local time and UTC, with seconds/milliseconds autodetect. Regex TesterTest JavaScript regular expressions live with highlighted matches, capture groups and handy snippets. JWT DecoderDecode JSON Web Tokens to inspect the header, payload and expiry. Nothing is sent anywhere. CSS Gradient GeneratorDesign linear, radial and conic CSS gradients with multiple color stops and copy the CSS. Number Base ConverterConvert numbers between binary, octal, decimal, hex and any base from 2 to 36, with big-number support. Code Minifier & BeautifierMinify or beautify HTML, CSS, JSON and JavaScript right in your browser and see how many bytes you save.

Frequently asked questions

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

Yes. Every developer tool here runs in JavaScript inside your browser tab. Input is processed on your device and isn't sent to PanDev or a third party. A few tools load an open-source library from a CDN on first use, such as the QR code library, but your data is never part of that request.

Do the developer tools work offline?

Most tools keep working without a connection once the page has loaded, because they rely on built-in browser features like JSON parsing, Web Crypto and BigInt. The QR code generator and scanner may need to download a small library the first time you use them.

Are the tools free with no limits?

Yes. All developer tools are free, need no account and have no daily caps or rate limits, since the work happens on your own device. For very large inputs, speed depends on your computer and browser rather than on a server queue.

Other categories

PDF toolsMerge, split, convert and edit PDFs.YouTube toolsPreview thumbnails & titles, grab assets, plan uploads.Audio & Music toolsCut, convert, record, tune and practice.Image toolsCompress, resize, crop and convert images.Video toolsRecord screens, grab frames, make GIFs.Text toolsCount, convert, compare and clean text.