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Encoding, URL & Unicode StudioFree onlineNo sign-upNo upload
Encode & Decode Base64URL, Percent-URLs, Hex, Base32/58 & IDN
Convert multi-byte UTF-8 strings and binary files across Base64, RFC 4648 Base64URL, URL query parameters, HTML entities, Hex, Base32/Base58, and IDN `xn--` Punycode locally.
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Encoding, URL & Unicode Studio — base64url utf8 url punycode encoder decoder
Encoding & URL Studio eliminates `btoa()` Latin1 crashes on Arabic, emoji, and CJK text by operating on true UTF-8 `Uint8Array` byte buffers.
Quick tip: Use Base64URL (`-` and `_`, unpadded) instead of standard Base64 (`+` and `/`) inside URL paths, OAuth PKCE verifiers, and JWT segments.
Frequently asked questions
Why does `window.btoa()` fail on non-ASCII characters?
`btoa()` expects single-byte Latin1 code units; encoding through `TextEncoder` UTF-8 bytes solves it cleanly.
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