Encodeur / Décodeur Base64
Encodez ou décodez du texte en Base64 instantanément, sans serveur.
Free online Base64 Encoder / Decoder
Base64 encoding converts binary data (images, files) into transportable ASCII text. FileSwiftly encodes and decodes your Base64 data instantly in the browser — no server involved, 100% private.
What is Base64 used for?
Base64 is used everywhere in web development: embedding images directly in CSS (`data:image/png;base64,...`), transmitting binary data in JSON APIs, encoding JWT tokens, or including fonts in stylesheets. It's also the format used for email attachments (MIME).
Base64 vs URL-safe Base64
Standard Base64 uses `+`, `/` and `=` which can cause issues in URLs. URL-safe Base64 replaces `+` with `-` and `/` with `_` — this is the format used in JWT tokens and URL parameters. Our tool supports both variants.
Encode an image to Base64
You can encode any image file (PNG, JPEG, SVG, GIF) to Base64 to embed it directly in your HTML or CSS without an additional HTTP request. Ideal for icons and small images in HTML emails or offline applications.
FAQ
Is Base64 encryption?
No. Base64 is encoding, not encryption. Anyone with your Base64 string can decode it instantly. For encryption, use AES or RSA.
Why does file size increase with Base64?
Base64 represents 3 bytes of data as 4 ASCII characters — a 33% overhead. A 1 MB file encoded in Base64 becomes ~1.37 MB.
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