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JSON FormatterYAML FormatterBase64 / URL EncodeJWT DecoderRegex TesterUnix TimestampCron BuilderUUID / ULIDPunycode / IDNBase ConverterACL Generator
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JSON FormatterYAML FormatterBase64 / URL EncodeJWT DecoderRegex TesterUnix TimestampCron BuilderUUID / ULIDPunycode / IDNBase ConverterACL Generator
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2.63.a76559e

Base64 / URL Encode

Encode or decode Base64 and URL percent-encoded strings. Supports Unicode. Runs entirely in your browser.

Mode
Direction
Examples:

Related Tools

JWT Decoder

Paste a JWT token to decode its header and payload claims. Runs entirely in your browser - the token is never sent to a server.

One-Time Secret

Share a secret that self-destructs after one view. Encrypted in your browser with AES-256-GCM - the server never sees your plaintext.

Text Transformer

Encode and decode text with Base64, URL encoding, HTML entities, hex, ROT13, Morse code, and binary. Instant, no signup, runs in your browser.

About this tool

Base64 encodes binary data as ASCII characters using a 64-symbol alphabet (A-Z, a-z, 0-9, +, /). It is widely used to embed binary data in JSON, HTML, and email (MIME). Every 3 bytes of input become 4 Base64 characters, adding roughly 33% overhead. Base64URL is a URL-safe variant that replaces + with - and / with _ and omits padding - used in JWTs, OAuth tokens, and URL parameters. This tool accepts both variants when decoding.

URL encoding (percent-encoding) converts characters that are unsafe in URLs into a %XX hexadecimal representation. For example, a space becomes %20, & becomes %26, and = becomes %3D. Essential when passing user-supplied text as a query string parameter to avoid breaking the URL structure.

All encoding and decoding runs entirely in your browser using built-in JavaScript APIs (btoa, TextEncoder, encodeURIComponent). Nothing is sent to our servers.