Base64 Encoder Decoder - Free, No Sign-Up
Overview
Switching between an encode tool and a decode tool wastes time during debugging. This tool detects whether the input looks like a Base64 string (all valid Base64 characters, length divisible by 4 or URL-safe) and defaults to decode. Otherwise it encodes. Override the direction manually with a single click.
How to Use This Tool
Paste text or a Base64 string. The tool auto-detects the direction and shows the result. To force encode or decode, click the direction toggle. URL-safe mode is available for both directions. Drag a file onto the drop zone to encode any binary file to Base64.
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PDF Tool →Frequently Asked Questions
How does the tool decide whether to encode or decode automatically?
It checks whether the input consists only of Base64 characters (A-Z, a-z, 0-9, +, /, =) and whether the length is valid. If both conditions pass, it defaults to decode. Plain text with spaces or punctuation defaults to encode.
Can I encode a PDF or image file to Base64?
Yes. Drag the file onto the drop zone. The encoder reads it as binary data using the FileReader API and outputs Base64. This is useful for embedding small images as data URIs in HTML or CSS.
Is Base64 a form of encryption?
No. Base64 is an encoding scheme, not encryption. Any tool can decode it without a key or password. Never use Base64 alone to hide sensitive data. Use AES or another cipher for actual confidentiality.