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DEVELOPER BENCH
Decode a Base64 string with browser-native APIs. Invalid Base64 receives a direct error and is never sent to a server.
WHAT THIS DOES
Runs entirely in your browser.
/tools/base64-decoderbase64-decoderv2.0.0LOCAL · LOCAL RUNIMPLEMENTED — This workbench is functional in the current release.Presets for this workbench
No preset yet. A preset stores the values in this form — never the result — and only for workbenches that run entirely in your browser.
Collections
Saved on this device only. Turn on sync to carry them to another device.
BATCH / ONE VALUE PER LINE
Up to 200 lines, one at a time, in this browser. Each line takes the place of base64 and everything else stays as you set it. Nothing is uploaded, and the row limit is not exceeded silently.
METHOD / LOCAL RUN
The Base64 string is decoded into bytes and interpreted as UTF-8 text locally in the browser.
Boundary: Decoded text is not authenticated or safe by itself. Do not treat decoding as signature verification, decryption, or content validation.
The calculation or transformation runs in your browser using the values entered above. No input is sent to UtilityForge for this tool.
EXAMPLES / LOCAL RUN FIXTURES
FAQ
No. This published tool runs locally in your browser. UtilityForge does not send the values entered in this workbench to a server.
The workbench states the exact method behind every result — the formula or procedure this page runs — so you can verify the computation instead of trusting a black box.
No. This workbench runs in the page: Base64 input are read by the code your browser already downloaded, and UtilityForge receives neither the values nor the result.
Yes, and it is enforced rather than advertised: Base64 input (100,000 characters). The limit is a browser input limit on a tool that runs on this device, so nothing is truncated after being sent anywhere.
Decoded text is not authenticated or safe by itself. Do not treat decoding as signature verification, decryption, or content validation.
RELATED TOOLS
LOCAL — Runs entirely in your browser.
COMMON USE CASES / SOURCE NOTE
Last reviewed:
Source information: Browser-native Base64 and UTF-8 decoding APIs; no external decoder is used.