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Encode any text or file to Base64 instantly — or decode a Base64 string back to plain text. Supports URL-safe mode (Base64URL) for JWT tokens and web APIs, MIME line wrap for email attachments, per-line encoding for batch entries, and 8 character sets for legacy systems. Upload a file or image and get the full Base64 and data URI output immediately. Everything runs in your browser — nothing is ever sent to our servers.
Drag & drop a file here, or click to browse
All file types supported · Processed 100% in your browserBase64 is a binary-to-text encoding scheme that converts binary data into a string of 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It was designed so binary data can be safely transmitted over text-based systems like email (MIME), HTTP headers, JSON, and XML. Base64 is encoding — not encryption. Anyone with the encoded string can decode it instantly.
Standard Base64 uses the characters + and / which have special meaning in URLs. URL-safe Base64 (Base64URL) replaces + with - and / with _ so the output can be used directly in URLs, filenames, and HTTP headers without percent-encoding. This is the format used by JWT tokens, OAuth tokens, and most modern web APIs.
Base64 encodes every 3 bytes of binary data as 4 ASCII characters. That 4/3 ratio means every file or string encoded to Base64 becomes approximately 33% larger. This is the trade-off for compatibility — the encoded output can pass safely through systems that only handle text.
MIME Base64 (RFC 2045) requires output to be split into 76-character lines with CRLF line breaks. This is required for Base64 content inside email attachments and MIME-formatted messages. For web use — data URIs, JWT tokens, API payloads — you do not want line breaks. Enable the 76-char wrap option only when creating Base64 for email or legacy MIME systems.
When enabled, each line of your input is encoded independently and produces its own Base64 output line. This is useful when you have a list of values — like API keys, tokens, or credentials — and want each one encoded separately rather than the entire block encoded as one string.
No. All encoding, decoding, and file processing happens entirely in your browser using built-in JavaScript APIs. Nothing you type or upload is ever sent to our servers, logged, or stored. The tool works fully offline once the page has loaded.
The tool supports UTF-8 (default, recommended for all modern use), ASCII, ISO-8859-1 (Latin-1), Windows-1252, UTF-16, UTF-16LE, and UTF-32. UTF-8 covers virtually all modern text including international characters. The legacy charsets are provided for developers working with older systems, email protocols, and legacy data pipelines.
Disclaimer: QuickITTools.com and EnterPlanet LLC strive to make our tools as accurate as possible. Results may vary — always verify critical encoded output before use in production systems.