Encoder / Decoder & Hash

How it works

1. Configure the operation — choose Base64, URL or a hash algorithm, and encode or decode.
2. Paste or type the text you want to transform.
3. The tool processes it instantly in the browser.
4. Copy the output with one click.

What it does

• Base64 encode — turn text or data into a safe Base64 string.
• Base64 decode — recover the original text from a Base64 string.
• URL encode — percent-escape spaces and symbols for safe query strings.
• URL decode — convert %20 and friends back to readable text.
• MD5 / SHA-1 / SHA-256 — generate a one-way hash digest of any input.
• Instant, private results — all processing happens in your browser.

Common use cases

• Debugging URLs — decode a messy, percent-encoded link to read its real parameters.
• Building query strings — encode a value safely before adding it to a URL.
• Verifying integrity — generate a SHA-256 digest to compare against a known checksum.
• Inspecting tokens — Base64-decode a payload to see what it contains.

Example

URL-decoding https%3A%2F%2Fexample.com%2F%3Fq%3Dseo%20tools returns the readable https://example.com/?q=seo tools, while hashing the word seo with SHA-256 gives a fixed 64-character digest you can copy.

Frequently asked questions

Is the Encoder / Decoder tool free?

Yes — completely free, with no signup. All operations run in your browser and nothing you paste is sent to a server.

Can I reverse a hash back to the original text?

No. MD5, SHA-1 and SHA-256 are one-way functions — they cannot be decoded back to the input. Use Base64 or URL encoding when you need a reversible transform.

How does this relate to my SEO work?

It is most useful for cleaning up and reading tracking links. Build properly encoded campaign URLs with the UTM Campaign URL Builder and create readable page slugs with the SEO URL Slug Generator.