Developer Tools 24

Encoders, formatters, hashes, ciphers and port checks. Every tool below is free, needs no sign-up, and runs entirely in your browser — your data never leaves your device.

Base Converter

Convert integers between bases 2–36 with BigInt-exact results.

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Timestamp Converter

Unix seconds or milliseconds to date and back, with world clocks.

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Base64 Encoder / Decoder

UTF-8-safe Base64 both ways with a URL-safe alphabet option.

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URL Encoder / Decoder

Percent-encode or decode with component and whole-URI modes.

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Unicode Encoder / Decoder

Text to \uXXXX, U+ notation or HTML entities — and back.

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Text to ASCII Converter

Character ⇄ code table with decimal, hex and ASCII flags.

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Image to Base64

Images to data URLs with HTML/CSS snippets — never uploaded.

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Compare Text

Side-by-side line diff with LCS matching and color highlights.

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Markdown Editor

Live Markdown preview with GFM tables and one-click HTML copy.

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MD5 Hash Generator

Classic MD5 digests for checksums and legacy formats, RFC 1321 verified.

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SHA Hash Generator

SHA-1/256/384/512 digests via native WebCrypto, all at once.

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RIPEMD-160 Hash Generator

RIPEMD-160 digests with official test vectors — Bitcoin-ready.

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HMAC Signature Generator

Keyed HMAC-SHA256/512 signatures via WebCrypto, key stays local.

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AES Encrypt / Decrypt

Authenticated AES-GCM (128/256) via WebCrypto, random IV, key never stored.

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DES / TripleDES Encrypt

Legacy DES and 3DES (ECB + PKCS7) for old systems, clearly labeled obsolete.

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Rabbit Encrypt / Decrypt

RFC 4503 Rabbit stream cipher verified against all official vectors.

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RC4 Encrypt / Decrypt

Classic RC4 for legacy protocols, verified vectors, honestly labeled insecure.

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HTML Formatter

Re-indent messy HTML with pre/textarea/script left untouched.

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CSS Formatter

Re-indent CSS with comments preserved and @media nested.

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JavaScript Formatter

Prettier-powered JS beautifier with semicolon and quote options.

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JavaScript Obfuscator

Light client-side obfuscation — string escaping and renaming.

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Local Port Checker

Check which common ports are reachable on your own machine.

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CSV ⇄ JSON Converter

RFC 4180-safe CSV to JSON and back, with delimiter and header options.

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JSON Formatter & Validator

Pretty-print or minify JSON with exact line-and-column error reporting.

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