base64encode.org has a huge character-encoding catalogue and accepts files up to 100MB. The default encode path goes through their server. PrivBatch encodes everything locally, with 0 bytes transmitted.
The character-encoding coverage is genuinely impressive - UTF-8, every ISO-8859 variant, Big-5, CP850/866/932/936/950, GB18030, UCS-2/4, UTF-7/16/32. If you are working with legacy Asian or European text encodings, base64encode.org probably handles your edge case and PrivBatch probably does not. The 100MB file upload limit is also generous compared to most browser-only tools.
They are also transparent about the architecture: the default mode goes through their server over SSL, and they offer an opt-in "Live mode" that runs in the browser instead. That disclosure is in the FAQ, not buried.
PrivBatch's Base64 tool is local by default - not opt-in, not "Live mode," just the only mode. The string you paste and the file you drop both stay in the tab. There is no server path because there is no server. The Prove It toggle confirms it: 0 network requests during encode or decode.
The tradeoff is honest. PrivBatch covers UTF-8 and ASCII out of the box - that is the 99% case for developers working with API tokens, image data URIs, JWTs, and config files. The legacy encodings are a deliberate gap.
| Feature | base64encode.org | PrivBatch |
|---|---|---|
| Character encoding coverage | 30+ encodings (UTF-8, ISO-8859, GB18030, Big-5, etc.) | UTF-8 + ASCII |
| Max file size | 100MB | Limited by browser memory (typically a few hundred MB) |
| Brand age | 15+ years, well-known result | Launched 2026 |
| Free to use | Yes | Yes (Free tier) |
| SSL on transport | Yes | Yes (but nothing is transported) |
| Default processing path | Server-side | Browser-side |
| Data sent to server during encode | Yes (unless you find and enable Live mode) | 0 bytes |
| File upload path | Uploaded to their server | Read with FileReader, never leaves the tab |
| Works fully offline | No (server-dependent by default) | Yes after first load |
| Prove-It network counter | No | Built-in toggle |
PrivBatch Tie Competitor
You need to encode text in GB18030, Big-5, EUC-JP, or one of the other 25+ legacy encodings, or you are encoding a non-sensitive file that comfortably fits their 100MB cap and you do not mind the server hop. Their encoding catalogue is hard to beat.
The string you are encoding is a secret (API token, certificate body, internal payload) or the file is anything you would not email to a stranger. UTF-8 covers the developer 99% case, and "0 bytes transmitted" is the default - not an opt-in toggle.
Try the privacy-first version. 0 bytes transmitted, by default.
Open Base64 →