ERC-20 Amount Converter

Convert an ERC-20 token amount to and from its raw on-chain integer for a given number of decimals, using BigInt so nothing is lost to floating point.

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Input
Output
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About erc-20 amount converter

ERC-20 Amount Converter keeps its state in memory and nowhere else. That is why it forgets everything on reload, and why it cannot leak anything.

No telemetry, no analytics on what you type, no request that carries the contents anywhere. The browser does the whole job.

You will find it under Blockchain, alongside 6 other tools for the same sort of job.

Runs in this tab, so nothing you type is uploaded.

How to use it

01
Start it
Every control is on the tool itself. Keyboard shortcuts, where there are any, are listed beside it.
02
Watch it run
It updates in the page as you go. Nothing is sent anywhere, so it keeps working with the network off.
03
Close when done
Nothing is stored between visits. Reloading gives you a clean start rather than picking up where you left off.

Examples

12.5 USDC to raw units
USDC uses 6 decimals, not the usual 18
Input
value: 12.5
decimals: 6
direction: humanToRaw
Output
Human amount: 12.5
Raw amount: 12500000
Raw 18-decimal amount back to a token amount
A typical 18-decimal token, such as most on Ethereum mainnet
Input
value: 1500000000000000000
decimals: 18
direction: rawToHuman
Output
Human amount: 1.5
Raw amount: 1500000000000000000

Questions

Does ERC-20 Amount Converter work offline?+

Yes. It is JavaScript running in this tab, so once the page has loaded it needs nothing further from the network. Put the machine in flight mode and it carries on. Nothing you do here is sent anywhere, because there is nowhere for it to go.

Does it remember anything between visits?+

No. Reload the page and it starts from nothing. There is no account, no saved state and no cookie holding your last session. That is a deliberate trade: it cannot lose your data because it never keeps any.

Is it accurate?+

Timing comes from performance.now(), the high resolution clock the browser provides, rather than from setInterval, which drifts by a few milliseconds every tick and compounds over minutes. What can still shift things is the browser throttling a tab in the background, so leave it visible if the timing matters.

Does it make a sound?+

Where a sound makes sense, it is generated with the Web Audio API rather than loaded as a file, so there is nothing to download and nothing to block. Browsers refuse to start audio until you have interacted with the page, which is why the first press is what switches it on.

Can I use ERC-20 Amount Converter on a phone?+

Yes. The controls are sized for touch and the layout collapses to one column on a narrow screen. Bear in mind that a phone locking its screen will suspend the page, and timing stops with it.