What is Base64 encoding?

Base64 maps binary data to 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is an encoding, not encryption: anyone can reverse it. It exists so binary bytes can travel through text-only channels (email, JSON, URLs) without control-character corruption.

When should I use Base64?

Use it when a transport or format is text-based but you need opaque bytes: embedding small images in HTML/CSS (data URIs), attaching binary in JSON, or legacy email MIME parts. Avoid it for large blobs on the wire—it inflates size by roughly 33% and adds CPU cost.

What is URL-safe Base64?

Standard Base64 uses + and /, which are awkward in URLs and some filesystems. URL-safe (RFC 4648) replaces + with - and / with _. Padding = may be omitted in some specs; decoders should accept both padded and unpadded forms when implementing.

Why does Base64 sometimes end with = or ==?

Padding aligns the bit stream to multiples of 24 bits (three bytes → four characters). One = means two leftover bytes; two = means one leftover byte. Strict parsers require correct padding; lenient ones infer length from the string.

Is Base64 the same as encryption?

No. Base64 provides zero confidentiality. If you need secrecy, use real cryptography (e.g., TLS in transit, authenticated encryption at rest). Pair encoding with a [Hash Generator](/hash-generator) or proper crypto only when the workflow actually calls for those primitives—not as a substitute.

Base64 Encoder/Decoder

v1.0.0

Encode and decode text to and from Base64 format. Supports UTF-8, file upload, clipboard copy, swap input/output, and keyboard shortcuts.

Text to Encode

Base64 Output

Output will appear here

Text to Encode

Base64 turns bytes into safe ASCII text. WMCoder helps you encode and decode quickly while you keep URL-safe variants, padding, and non-security use cases straight.

Read the full guide →

Frequently Asked Questions

What is Base64 encoding?: Base64 maps binary data to 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is an encoding, not encryption: anyone can reverse it. It exists so binary bytes can travel through text-only channels (email, JSON, URLs) without control-character corruption.
When should I use Base64?: Use it when a transport or format is text-based but you need opaque bytes: embedding small images in HTML/CSS (data URIs), attaching binary in JSON, or legacy email MIME parts. Avoid it for large blobs on the wire—it inflates size by roughly 33% and adds CPU cost.
What is URL-safe Base64?: Standard Base64 uses + and /, which are awkward in URLs and some filesystems. URL-safe (RFC 4648) replaces + with - and / with _. Padding = may be omitted in some specs; decoders should accept both padded and unpadded forms when implementing.
Why does Base64 sometimes end with = or ==?: Padding aligns the bit stream to multiples of 24 bits (three bytes → four characters). One = means two leftover bytes; two = means one leftover byte. Strict parsers require correct padding; lenient ones infer length from the string.
Is Base64 the same as encryption?: No. Base64 provides zero confidentiality. If you need secrecy, use real cryptography (e.g., TLS in transit, authenticated encryption at rest). Pair encoding with a [Hash Generator](/hash-generator) or proper crypto only when the workflow actually calls for those primitives—not as a substitute.