Base64 Normalizer

Clean up and standardize your Base64 strings. Remove whitespace, fix padding, convert between standard and URL-safe formats, and format with MIME-style line breaks.

Strip Whitespace

Remove all spaces, tabs, and newlines from your Base64 strings in one click.

Fix Padding

Automatically add or remove padding (= signs) to create valid, correctly padded Base64 strings.

URL-Safe Conversion

Convert between standard Base64 and URL-safe Base64 (for JWT, URLs, and API parameters).

MIME Formatting

Format Base64 with 76-character line breaks for email and MIME compatibility.

Enter a Base64 string to normalize

Paste a Base64 string above and click Normalize

Fix Padding

Automatically adds or removes Base64 padding (= signs) to create valid strings.

Convert Formats

Switch between standard Base64 and URL-safe Base64 (for JWT, URLs, and APIs).

MIME Formatting

Format Base64 with 76-character line breaks for email and MIME compatibility.

Frequently Asked Questions

Got questions? We've got answers. Search below or browse through our most commonly asked questions.

The normalizer takes a poorly formatted Base64 string (with spaces, newlines, tabs, or missing padding) and cleans it into a single, continuous, properly-padded standard Base64 string.

Use it when copying Base64 from emails, PDFs, or formatted JSON logs where line breaks or spaces might have corrupted the string.