OmniTools

Base64 & URL Encoder / Decoder

Convert text or files to Base64 data strings and encode/decode URL components.

Basis: RFC 4648 — The Base16, Base32, and Base64 Data Encodings·2026-08-28 verified·Editorial policy

Before you rely on this

Base64 is an encoding, not encryption — anyone can decode it, so it must not be used to conceal passwords or personal data. Standard and URL-safe Base64 differ in characters 62 and 63 and are not interchangeable.

Tool Overview & Key Purpose

Encode and decode strings, URLs, and data payloads into Base64, URL-encoded, and UTF-8 formats.

Step-by-Step Usage Instructions

1STEP 1

Choose conversion mode (Base64 Encode, Base64 Decode, URL Encode, URL Decode).

2STEP 2

Paste input string into the text panel.

3STEP 3

View instant converted output supporting multi-byte UTF-8 character sets.

4STEP 4

Click to copy output payload to clipboard.

Real-World Scenarios & Practical Cases

3 Practical CasesScenario #1

HTTP Basic Authentication Header Generation

Encode `username:password` into Base64 `dXNlcjpwYXNzd29yZA==` for Authorization headers.

Essential for testing RESTful API auth.Scenario #2

URL Query Parameter Encoding

Safe URL encoding for special characters (`?`, `&`, `=`, spaces) into percent-encoded strings like `%20`.

Prevents broken URL query string parameters.Scenario #3

Inline Data URI Image Embedding

Convert small SVG icons into Base64 `data:image/svg+xml;base64,...` to reduce external HTTP requests.

Improves web page asset loading times.Specification followedRFC 4648 Base64 standard and RFC 3986 Percent-Encoding algorithms.

Pro Tips & Key Considerations

Base64 is an encoding format, NOT encryption; anyone can decode it back easily.Base64 encoding increases total data size by approximately 33%.

Frequently Asked Questions (FAQ)

Sources & References

IETF RFC 4648 — The Base16, Base32, and Base64 Data Encodings MDN Web Docs — Base64 Glossary

Basis: RFC 4648 — The Base16, Base32, and Base64 Data Encodings · 2026-08-28 verified