Encoding & Conversion Tools
Free, instant, browser-based tools for encoding and decoding text in common developer formats.
Developers constantly move data between formats. A binary file becomes a Base64 string to fit inside a JSON payload. A URL parameter gets percent-encoded so it survives the journey through browsers, proxies, and servers without being misread as a delimiter. A decimal number becomes hex to appear in a color code or a memory address. These transformations are mechanical and error-prone to do by hand — a dedicated converter removes the friction instantly.
Every tool in this collection runs entirely in your browser. There is no upload step, no account, and no data leaving your machine. That means these tools are safe to use with internal tokens, private API responses, or any other content you would prefer not to paste into a third-party server.
Encoding is not the same as encryption. Base64, URL percent-encoding, and binary are all fully reversible without a key — anyone who receives the encoded string can decode it immediately. If you need to protect data in addition to encoding it, apply a proper encryption layer before or after encoding.
Tools in this category
Base64 Converter
Encode and decode text to and from Base64 format instantly.
Open tool →Binary Converter
Convert text, decimal, and hexadecimal to binary and back instantly.
Open tool →URL Encoder / Decoder
Encode text to percent-encoded URL format or decode URL-encoded strings back to plain text.
Open tool →Number Base Converter
Convert numbers between binary, octal, decimal, hex, and any base from 2 to 36.
Open tool →Frequently Asked Questions
What is text encoding and why does it matter?+
Text encoding converts data into a specific format that can be safely transmitted or stored in systems with character restrictions. Many protocols — HTTP query strings, email headers, JSON values — expect plain ASCII text. Encoding schemes like Base64, percent-encoding, and binary let you represent any data as a portable string without corrupting it in transit.
When should I use Base64 vs URL percent-encoding?+
Use Base64 when you need to embed binary data (images, files, raw bytes) inside a text context like an email body, a CSS data URI, or a JSON field. Use URL percent-encoding when passing text values as query string parameters or form submissions — browsers and servers understand it natively for that purpose.
What is the difference between binary and hexadecimal?+
Both are positional number systems that represent the same underlying data differently. Binary (base 2) uses only 0 and 1, which maps directly to computer logic states. Hexadecimal (base 16) uses digits 0–9 and letters A–F, making it a compact shorthand for binary — each hex digit represents exactly four binary bits. Developers use hex for color codes, memory addresses, and hash values because it is shorter to read than raw binary.
Are these encoding tools safe to use with sensitive data?+
All processing happens entirely in your browser using JavaScript — no data is sent to any server. Encoding is not encryption; Base64, URL encoding, and binary are reversible without any key. Never use encoding alone to protect sensitive information. If you need confidentiality, use proper encryption in addition to encoding.