Encoding Tools

Encode and decode data instantly: Base64, URL, HTML entities, Hex, ROT, JWT and more—all in your browser for speed and privacy.

39 tools available

Blockchain Tools 2

ABI Encoder / Decoder

Decode Ethereum calldata and encode function calls online. Resolves unknown 4byte selectors, decodes tuples, structs, arrays and multicall on any EVM chain.

Solidity Function Selector

Compute Solidity 4-byte function selectors (method ID) and 32-byte event topic hash via Keccak-256. Canonical signature normalization, calldata template, lookup.

Conversion 22

Number Conversion 22

ASCII Hex Binary Dec Converter

Convert between ASCII text, hexadecimal, binary, decimal, and Base64 encoding. Free online number system converter with delimiter and prefix options.

ASCII to Binary

Convert text to binary strings using various character encodings. Free online ASCII to binary converter with file support and customizable delimiters.

ASCII to Hex

Convert text to hexadecimal strings using various character encodings. Free online ASCII to hex converter with file support and customizable delimiters.

Base Converter

Convert numbers between different number bases (2-36). Free online base converter supporting binary, octal, decimal, hexadecimal and any base up to 36.

Binary Converter

Convert binary numbers to decimal, hexadecimal, octal, and ASCII text. Free online binary converter with instant results.

Binary to ASCII Converter

Convert binary strings to ASCII, UTF-8, and other character encodings. Free online binary to text converter with file support.

Binary to Decimal

Convert binary numbers (base-2) to decimal numbers (base-10) instantly. Free online binary to decimal converter with step-by-step conversion process.

Binary to Hex

Convert binary numbers to hexadecimal and decimal. Free online binary to hex converter with step-by-step calculations and digit grouping support.

Binary to Octal

Convert binary numbers (base-2) to octal numbers (base-8) instantly. Free online binary to octal converter with step-by-step conversion process.

Binary to String

Convert binary strings to text using various character encodings. Free online binary to string converter with file support and multiple encoding options.

Decimal to Binary

Convert decimal numbers (base-10) to binary numbers (base-2) instantly. Free online decimal to binary converter with conversion steps.

Decimal to Hex

Convert decimal numbers to hexadecimal with step-by-step calculation. Simple and accurate decimal to hex conversion tool.

Decimal to Octal

Convert decimal numbers to octal and hexadecimal with step-by-step calculation. Simple and accurate decimal to octal conversion tool.

Decimal to Percent

Convert decimal numbers to percentage with step-by-step calculation. Simple and accurate decimal to percent conversion tool.

Hex Dec Bin Converter

Convert between hexadecimal, decimal, binary, and octal numbers instantly. Interactive bit toggle interface with support for signed numbers and different bit widths.

Hex to ASCII

Convert hexadecimal strings to ASCII text with multiple character encodings (UTF-8, Latin-1 and more). File upload supported. Free, no signup needed.

Hex to Binary

Convert hexadecimal numbers to binary numbers instantly. Free online hex to binary converter with step-by-step conversion process and digit grouping.

Hex to Decimal

Convert hexadecimal numbers to decimal with step-by-step calculation. Supports signed and unsigned decimal conversion with binary representation.

Hex to Octal

Convert hexadecimal numbers to octal with step-by-step calculation. Supports both octal and decimal output with detailed conversion steps.

Octal to Binary

Convert octal numbers to binary with step-by-step calculation. Simple and accurate octal to binary conversion tool. Free converter with formulas.

Octal to Decimal

Convert octal numbers to decimal with step-by-step calculation. Simple and accurate octal to decimal conversion tool. Free converter with formulas.

Octal to Hex

Convert octal numbers to hexadecimal with step-by-step calculation. Simple and accurate octal to hex conversion tool. Free converter with formulas.

Data Tools 1

CSV Encoder

Fix CSV/TSV delimiters, add UTF-8 BOM for Excel, normalize quotes and line breaks, and validate column counts against RFC 4180 before import.

Developer Tools 13

Encoding 12

Base32 Encoder/Decoder

Encode or decode Base32 online per RFC 4648, with Base32hex and Crockford variants. Strict validation. Ideal for TOTP secrets, ULIDs and DNS.

Base58 Encoder/Decoder

Free online Base58 encoder/decoder. Decode Base58 strings, IPFS CIDs and raw bytes to hex or UTF-8 text, and encode text or hex (Bitcoin alphabet).

Base64 Encoder/Decoder

Free Base64 encoder & decoder. Encode text or files, generate data: URIs, decode Base64URL/JWT, UTF-8 & MIME line wrapping. Fast, private, browser-based.

Base85 Encoder/Decoder

Encode text or binary to Base85 (Ascii85) and decode back instantly. 25% more compact than Base64, perfect for PDF, PostScript and Git pack files.

HMAC Generator

Generate and verify HMAC signatures (SHA256/SHA512/SHA1/MD5). Compare webhook signatures, sign AWS requests and JWT HS256. Hex or Base64, 100% browser.

HTML Entities Encoder/Decoder

Escape HTML or decode entities online. Named, numeric & hex forms, code-point inspector, OWASP context-aware escaping — a free htmlspecialchars equivalent.

Hex Encoder/Decoder

Text ⇄ hex converter — plain, 0x-prefixed, space-separated, upper/lowercase. Auto-detects on decode, handles UTF-8. For debugging, memory dumps, colors.

Image Base64 Encoder/Decoder

Encode images to Base64 data URIs that preserve the original format and MIME with no quality loss, or decode Base64 to PNG/JPG. Client-side, no upload.

JWT Encoder/Decoder

Decode JWTs and verify HMAC signatures (HS256/384/512) in-browser. Inspect header, payload, claims, and validate exp, nbf, and iat. Build and sign tokens too.

Punycode Converter

Convert Unicode domains (IDN) to ASCII Punycode and back per RFC 3492. IDNA2008 / UTS-46 NFC normalization, xn-- ACE label, mixed-script warning.

ROT Encoder/Decoder

Free online ROT encoder and decoder with ROT13, ROT5, ROT18, ROT47, and Caesar shifts ROT-0 to ROT-25. Brute-force every rotation in one click to crack unknown-shift ciphers for CTF and puzzles.

URL Encoder/Decoder

Free URL encoder/decoder with encodeURIComponent vs encodeURI and RFC 3986 strict mode for OAuth and AWS SigV4 canonical requests. Decode preserves literal +.

Utilities 1

JavaScript Obfuscator

Free private JavaScript obfuscator. 100% browser-side, with presets, control-flow flattening, string-array encoding, Node.js target and reproducible seed.

Text Tools 1

Text to Morse

Free online Morse code translator and encoder/decoder. Convert text to Morse, play CW audio with adjustable WPM and Farnsworth timing for ham radio practice.