Decode Base64 Strings & Data URIs with Instant Byte & Image Inspection

Q: How much size overhead does Base64 encoding add to binary files?

Base64 represents every 3 bytes of binary data using 4 ASCII characters, adding approximately 33% size overhead before HTTP compression.

Paste any data:image/... Base64 URI or raw Base64 payload to inspect MIME headers, exact decoded byte size, hex magic bytes, and live visual rendering.

✓ MIME & Magic Byte Inspector Target Keyword: "base64 to image and data uri decoder online" (130,000/mo) Est. Ad RPM: $15 – $23

INPUT SOURCE 278 chars

data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI2NCIgaGVpZ2h0PSI2NCIgdmlld0JveD0iMCAwIDY0IDY0Ij48cmVjdCB3aWR0aD0iNjQiIGhlaWdodD0iNjQiIHJ4PSIxNCIgZmlsbD0iIzEyMTgyNCIvPjxjaXJjbGUgY3g9IjMyIiBjeT0iMzIiIHI9IjE2IiBmaWxsPSIjRDg0QTFCIi8+PC9zdmc+

LIVE PROCESSED OUTPUT UTF-8 • CLIENT-SIDE

Processing...

Ready • 100% local execution Server Cost: $0.00 • Latency: <5ms

How to Use the Base64 Visual Decoder

STEP 01

Paste a full Data URI (data:image/png;base64,...) or raw Base64 string into the input box.
STEP 02

Inspect the detected MIME type, Base64 overhead percentage, and hex magic bytes.
STEP 03

Preview the decoded graphic or text payload directly below.

Frequently Asked Questions (Base64 Visual Decoder)

How much size overhead does Base64 encoding add to binary files?

Base64 represents every 3 bytes of binary data using 4 ASCII characters, adding approximately 33% size overhead before HTTP compression.