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Online Hex to Base64 Converter

Paste a hex string and convert it to Base64 in one click. Whitespace and common separators are ignored, and you can output URL-safe Base64 or remove padding. Everything runs locally in your browser.

Category: Developer · URL: /tools/online-hex-to-base64-converter.html
Input (hex)
Tip: for hex, spaces, newlines, :, -, _ and a leading 0x are ignored.
Output (Base64)
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Privacy: runs locally in your browser. No uploads, no tracking scripts.

How to use

This tool converts raw bytes represented as hex into Base64 (or reverses Base64 back to hex).

  1. Select Hex → Base64 (default) or Base64 → Hex.
  2. Paste your value. For hex, separators like spaces, :, -, and a leading 0x are fine.
  3. Optional: enable URL-safe output and/or remove padding.
  4. Click Convert, then Copy the result.
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Secondary intents covered: Convert a hex dump into Base64 for an API payload, Handle hex strings with spaces, colons, or newlines, Generate URL-safe Base64 for JWTs or web-safe transport, Remove or keep Base64 padding depending on a protocol, Decode Base64 back to hex to inspect raw bytes, Validate hex input (illegal characters, odd length), Quickly copy output for use in code or CLI commands, Compare expected outputs while debugging encoders

FAQ

What hex formats does this accept?

It accepts plain hex plus common separators (spaces, newlines, :, -, _) and an optional leading 0x.

Why do I get “Hex length must be even”?

Hex encodes bytes as two characters per byte; an odd number of hex digits can’t be parsed into full bytes.

What is URL-safe Base64 (Base64url)?

Base64url replaces + with - and / with _, and often omits padding; use it for URLs, JWTs, and web transport.

Should I remove Base64 padding (=)?

Only if your target format requires it (e.g., many Base64url uses). Standard Base64 commonly keeps = padding.

Can I convert Base64 back to hex?

Yes—switch the direction to Base64 → Hex. Base64url input is also accepted.

Does this tool upload my data?

No. The conversion runs locally in your browser and does not send input to a server.

Is there a size limit?

It depends on your browser/device memory. Very large inputs can be slower, but the code is chunked to avoid common stack issues.