Base64 Text Encoder & Decoder

Supports standard Base64 and URL-Safe modes with full UTF-8 multilingual compatibility

100% Browser Local Computing: Zero Cloud Upload - Offline Capable

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URL-Safe Mode (RFC 4648)

Enter plain text or Base64 string0 字元

Output Result

Pure client-side Base64 text encode and decode tool supporting UTF-8 Chinese characters and RFC 4648 URL-safe mode.

Frequently Asked Questions

What is the difference between standard and URL-Safe Base64?

Standard Base64 uses + and /, which can cause issues in URLs. URL-Safe Base64 replaces them with - and _ and omits padding.

Why do some Base64 decoders produce garbled characters with Unicode text?

Native browser atob only handles Latin1 characters. This tool utilizes TextEncoder/TextDecoder for proper UTF-8 handling.

Accurate word count, character statistics, paragraph analysis, and reading time estimation

Accurate calculations for brokerage discounts, transaction tax, ROI, and break-even stock prices

Automatically applies 0.15% halved transaction tax with +/- 5 tick profit simulations

Applies 0.1% preferential ETF transaction tax rate for cost and DCA calculations

Fast bidirectional calculation of 5% VAT sales tax and gross/net amounts compliant with MOF rules

One-click conversion of numbers to standard formal Chinese financial characters for fraud prevention