Base64 and URL encoding online free

Encode, decode and SHA-256 — five developer operations, data never leaves the browser.

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Encoding both ways

BEFOREAFTER

How to encode in 4 steps

01Paste text or a string

A token, link or any data.

02Pick an operation

Base64 both ways, URL encoding, SHA-256.

03Click Convert

The result is instant.

04Copy with one click

Into code, a config or the terminal.

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Base64 in Basic-auth headers and data URIs, URL encoding in link parameters, SHA-256 in webhook signatures — the daily routine of developers and testers. Five operations in one tool, unicode-safe, entirely in the browser: tokens and keys never leave the tab. Run decoded JSON through the formatter; build parameterised links in the UTM builder. Integrating AI? The Zerocoder API gives one key to every model. The rest of the tools are in one section.

Base64: where it appears and why

Base64 turns any bytes into safe text from a 64-character alphabet — that's how binary data travels where only text is allowed: auth headers, email attachments, image data URIs, JWT tokens. A JWT's middle part is Base64-encoded JSON: decode it here and see the token's contents. Encoding is unicode-safe: any script and emoji survive both ways.

URL encoding: why links break without it

Spaces and special characters in link parameters must be percent-encoded, or the link dies at the first ampersand or space. The classic: passing a page URL in a redirect parameter — without encoding the nested parameters mix with the outer ones. The rule: encode each parameter's value separately, not the whole link.

SHA-256: integrity checks and signatures

A hash is a digital fingerprint: change one byte and the hash changes. SHA-256 verifies file integrity, signs webhooks and stores passwords (with salt). Important: a hash is irreversible — it's not encryption, the source can't be recovered. Computed via the browser's built-in crypto module: data never leaves the tab.