Free tool
Base64 Size Estimator
Estimate decoded file size from Base64 strings.
- 100% Free to use
- No credit card required
- Works offline in your browser
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Why it helps
Quick estimates
Check Base64 payload size before shipping.
Works with data URLs
Paste raw Base64 or a full data URL.
Base64
Base64 size estimator
Bytes
0
KB
0.00
MB
0.00
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FAQ
Quick answers about this tool.
Is this private?
Yes. All processing happens in your browser.
Do I need an account?
No. These tools are free and work without signup.
Can I use multiple files?
Yes. Most tools support batch processing.
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