Encode text or files as Base64
Encoding Collection
Online Encoding & Decoding Tools
Base64, URL encoding, HTML entities, Unicode, binary, JWT and Basic Auth utilities in one place.
A focused entry for everyday encoding, decoding, escaping and token inspection tasks. Handle Base64 text and files, URL parameters, HTML entities, Unicode escapes, binary text, JWT payloads and Basic Auth headers locally in your browser.
12Curated tools
3Workflows
3FAQ answers
Built for these intents
Check URL query parameter escaping
Display HTML snippets safely
Inspect JWT and Basic Auth API credentials
Tools in this hub
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to plain text with UTF-8 support. Supports Base64, Base64 encode. Bidirectional, instant preview, one-click copy. Free at oltool.net.
Base64 File Encoder
Encode any local file to a Base64 data URL for images, PDFs and binary files. Supports Base64 file, file to Base64. Bidirectional, one-click copy. Free at oltool.net.
URL Encoder / Decoder
Encode or decode URL-safe strings using percent-encoding for query params. Supports URL encode, URL decode. Bidirectional, instant preview, one-click copy. Free at oltool.net.
HTML Entities
Encode or decode HTML entities (&, <, >, ", ') for safe rendering. Supports HTML entities, HTML encode. Built for developers, works offline. Free at oltool.net.
Text to Unicode
Convert text to Unicode escape sequences (\uXXXX) and back for UTF-16. Supports Unicode, Unicode escape. Bidirectional, instant preview, one-click copy. Free at oltool.net.
Text to Binary
Convert text to binary or back via UTF-8 encoding for ASCII/Unicode. Supports text to binary, binary converter. Bidirectional, instant preview, one-click copy. Free at oltool.net.
JWT Parser
Decode and inspect JWT tokens (header, payload, expiry) with signature check. Supports JWT, JWT decode. Built for developers, no signup, works offline. Free at oltool.net.
Basic Auth Generator
Generate Basic-Auth Authorization header from username and password with Base64. Supports Basic Auth, Authorization header. Built for developers, works offline. Free at oltool.net.
Color Converter
Convert colors between HEX, RGB, HSL formats with alpha channel support. Supports HEX color, RGB. Bidirectional, instant preview, one-click copy. Free at oltool.net.
Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE. Supports camelCase, snake_case. Bidirectional, one-click copy. Free at oltool.net.
Roman Numeral Converter
Convert between Arabic numbers (1-3999) and Roman numerals instantly. Supports Roman numeral, Arabic number. Bidirectional, instant preview, one-click copy. Free at oltool.net.
Text to NATO Alphabet
Convert text to NATO phonetic alphabet (Alpha, Bravo, Charlie). Supports NATO phonetic alphabet, Alpha Bravo Charlie. Bidirectional, one-click copy. Free at oltool.net.
Suggested workflows
API auth debugging
Decode JWT payloads, generate Basic Auth headers and clean URL parameters.
Frontend escaping
Convert HTML entities, Unicode escapes and URL text to fix display issues.
File embedding
Encode local files as Base64 data URLs and copy them into configs or snippets.
Why an encoding hub helps
Covers API and frontend friction
Auth headers, query strings, HTML escaping and character encoding often overlap during debugging.
Fast paste-and-go work
Most encoding jobs are short-lived string transformations, so a web tool is faster than opening an IDE.
Sensitive data stays local
Tokens, headers and files are processed in your browser rather than sent to a remote service.
Encoding tools FAQ
Is Base64 encryption?
No. Base64 is an encoding format and can be decoded by anyone. It should not be used to protect secrets.
How is URL encoding different from HTML entities?
URL encoding is for addresses and query strings, while HTML entities are for safely displaying special characters in HTML.
Does JWT parsing verify signatures?
Parsing shows header and payload. Signature verification depends on tool support and whether you provide the signing key.