Runs in
On-chain bench
Decoded in this tab. The calldata is never sent anywhere.
On-chain · Free now
Calldata Decoder
Paste the data field of a transaction and read what it calls and with which arguments. The common ERC-20, ERC-721 and router selectors resolve offline, and anything else decodes once you supply the signature.Your data stays in this tabGives you Decoded arguments, Risk notes, TXT
Calldata Decoder is ready for input.
Decoded in this tab. The calldata is never sent anywhere.On-chain bench
Free nowNo upload0 selected · 0 BDecoded argumentsRisk notesTXT
Step 1
Set controls
Step 2
Run tool
Waiting for files and settings.
0%
Pick files and run the tool.
Notes
The selector dictionary is offline, so the common ERC-20, ERC-721 and router calls resolve with no lookup.
For anything else, paste the function signature and the decoder checks it hashes to the same selector before trusting it.
Workspace controls
Save a full workspace when you want the tool state, files, and team note preserved together.
Versions and sharing
Output versions appear here after successful runs so users can compare before exporting again.
Run detailsRunnable
What this tool does
Limit
Results depend on source quality and selected settings. The tool reports failures instead of silently claiming completion.
Input
No upload required; complete the visible controls. Read what a transaction actually does before you sign it. Selector, arguments, and anything worth worrying about.
The Run button stays disabled until the required input is ready.
Output
Decoded arguments, Risk notes, TXT. Output names, file sizes, result notes, and downloads stay in the same workspace.
Results stay with the settings and source files used for the run.
If it fails
The workspace preserves staged settings, queue state, run progress, errors, retry, result versions, presets, and export bundles.
The console keeps the error and lets you retry the same setup.
Input readiness checkVisible run progressExplicit success or error stateDownload and rerun path
Inputs and features
Optional input
LimitedNothing to upload. Paste the hex or the JSON.
Camera capture
LimitedNot used by this tool group.
Clipboard paste
ReadyPaste calldata or a typed-data request straight from the wallet prompt.
Import package
ReadyRestore saved contract labels and signature notes.
Share setup
ReadyShare a decoded reading without sharing the wallet it came from.
Export package
ReadyDownload the decoded reading and its risk notes as TXT.
Saved workspacesPresetsRecent jobsRerun historyBatch queueProgress and ETACancel and retryMobile camera inputClipboard intakeCloud import and export
Language and help
4h first response
Related tools
Support notes
Support path
On-chain bench
4h first response
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Use it forReading a multisig payload, a pending transaction, or a contract call somebody sent you.
Good to knowSupply a signature and it is checked against the selector before anything is decoded. A signature that does not hash to the same four bytes is rejected rather than quietly producing plausible nonsense.
- Calldata
- ABI decode
- Selector lookup
- Multisig review
- Offline
Where your data goesNowhere. The work happens in this tab.