Free Anyza tools

Anyza has a set of free public tools. You don't need to be a member of any community, and almost none of them needs an Anyza account. Five live on Anyza Club (anyza.club) and three on Anyza Pay (anyzapay.com).

Each Club tool has its own address in each language. The English addresses are below; the Portuguese ones are in the Portuguese version of this article. You can also switch language with the selector at the top of the page: it takes you to the address in that language. The Pay tools use the same address in every language and change language with ?hl= (for example anyzapay.com/qr?hl=es).

The only tool that asks you to sign in is the digital signature, and only if you choose to sign with your Anyza account.

Bitcoin timestamp

Address: anyza.club/bitcoin-timestamp. Free, no sign-up.

It proves a file existed on a date and hasn't been changed since. Your browser calculates the file's fingerprint (sha256) and only that fingerprint goes to the OpenTimestamps calendars, which write it into a Bitcoin block. The file is never uploaded, and Anyza doesn't keep the file or the proof.

To register:

1. Under Stamp, choose Files or Text.
2. Drop your files (up to 20 at a time, up to 500 MB each, any type) or paste a text and tap Stamp the text.
3. Tap Stamp on Bitcoin.
4. Tap Download the proof (.ots) for each file. With text, also tap Download the text: you'll need the exact text to check it later.

Keep the .ots together with the original file, without changing anything in the file. You need both. The proof starts as "pending" and enters a Bitcoin block usually within 1 to 12 hours.

To check, open Check a record, choose the Original file and the Proof (.ots) and tap Check. If the record is in a block, you see "This file existed on {date}", the block number and Download the complete proof. Keep the complete proof in place of the old one: it no longer depends on any server, and anyone can also check it at opentimestamps.org. If the proof doesn't match, the file is a different one or was changed after it was stamped.

E-mail notice (optional)

After stamping, the box Want an email when the record makes it into a Bitcoin block? lets you type your e-mail and tap Notify me. When every file of that request is in a block, you get one e-mail with the block, the date (UTC) and the complete .ots proofs attached. Until then Anyza keeps only the fingerprint, the file name and your e-mail; after the notice, they are deleted. If no block comes within 4 days, the request is deleted too.

Limits

• Up to 30 registrations a day per connection, up to 200 checks a day and up to 20 e-mail notice requests a day.
• It proves the file existed on a date. It doesn't prove authorship and doesn't replace a notary, trademark or copyright registration when the law requires one.

Digital signature recorded on Bitcoin

Address: anyza.club/bitcoin-digital-signature. Free. An account is needed only for level 2.

You sign any file with a message (your name, an acceptance, a statement). The message, the file's fingerprint and the date are written inside the file itself, and that bundle is recorded on Bitcoin (OpenTimestamps). The file is read and signed in your browser and never uploaded.

To sign:

1. Under Sign a file, choose one file of up to 200 MB.
2. Write the Signature message.
3. Under How to sign, pick the level:
   • Stated name: you type your name. No sign-up. It proves the content and the date; the name is stated by you.
   • Anyza account: requires Log in to Anyza. The checker shows "signed by @user", confirmed by Anyza.
   • Solana wallet: tap Connect wallet (Phantom, Solflare...). The wallet signs the message with its key. On a phone, open the page in your wallet's browser.
4. Tap Sign and record on Bitcoin. The signed file downloads with "-signed" added to its name (for example contract-signed.pdf). You can also tap Download the certificate (image).

Where the seal goes:

• PDF: a certificate page is added at the end, with the file, its fingerprint, the message, who signed, the date with time zone, the Bitcoin record, the seal code and a verification QR code. It's added as a PDF update: the original pages don't change, and a PDF that already had an official signature keeps it valid.
• Word, Excel and ZIP: the seal goes into the file comment. The file keeps opening.
• Images, video, audio and other files: the seal goes at the end of the file. It keeps opening normally.

To check, open Check a signed file and tap Choose the signed file. Your browser finds the seal, separates the exact original and tells you Valid signature: the file is exactly as it was signed or that the content was changed. It shows the message, who signed, the date and the Bitcoin block, and lets you Download the original file and Download the complete proof (.ots). Scanning the QR code on the certificate opens the record (who, when, block) without the file; to check the content, upload the file.

Anyza keeps only the seal code, the file's fingerprint, the signature type, the account (level 2) or wallet (level 3) and the proof. The message and the file name are not stored.

Limits

• One file of up to 200 MB per signature, up to 30 signatures a day per connection.
• It's not a qualified e-signature (eIDAS or a national PKI such as ICP-Brasil). When the law requires an official certificate, use one.

Verifiable giveaway (Bitcoin or Solana)

Address: anyza.club/bitcoin-giveaway. Free, no sign-up.

You paste a list and the winner comes from the hash of a block that didn't exist yet when the list was frozen. Nobody, not even Anyza, can choose the result.

1. Optionally fill in Giveaway name (optional).
2. Paste the Entries (one per line): names, @usernames or numbers, from 2 to 5,000.
3. Choose the number of Winners (up to 50).
4. Choose the Draw network: Bitcoin (default, about 20 to 30 minutes, the hardest to manipulate) or Solana lightning (about 1 minute, for live streams and quick draws).
5. Enter Your email (organizer). It's required: you get the link right away and the result when it's out. It doesn't appear on the page.
6. Tap Draw.

The giveaway page is public to anyone with the link and shows the list of names, so don't paste personal data beyond names. Use Share or Copy link to send it to participants. The page shows a countdown and refreshes on its own. When it's done it shows the winners, Redo the math here (recalculates everything in the browser), Download the list and Download the .ots. Anyone can also upload the .ots with Upload the .ots file to check the Bitcoin record.

With Solana, whoever produces the block has a bit more influence over the hash, and the list's Bitcoin record arrives after the result. For valuable prizes, prefer Bitcoin.

Limit: 20 giveaways a day per connection. The organizer is responsible for the giveaway, the prize and their country's rules.

The page How the Bitcoin hash giveaway works explains the method with a real example. For giveaways inside a community (with tasks, subscribers and automatic notices), see Giveaways.

Community revenue calculator

Address: anyza.club/community-revenue-calculator. Free, no sign-up.

It shows how much of a paid community's revenue you keep on each platform. Fill in Paying members, Price per month and Currency, and tick Private community if only people you approve join. The calculator compares Anyza Club with Skool (Hobby and Pro), Patreon, Whop and Hotmart and shows how much the fees take per year.

The other platforms' fees are public figures checked in October 2026 and may have changed. On Anyza Club the calculator counts the community's credits (public 1 credit a day, private 2; 1,000 credits = US$10). Lives, videos and translation use extra credits when you use them.

Course showcase

Address: anyza.club/online-courses, or the short address class.anyza.club. Browsing is free and needs no account.

It lists the courses from Anyza communities that have a public page. You can Search courses and filter by Language and Topic, sort by Most students, Top rated or Newest, and see which ones have a Free preview or a Certificate. Each course opens its public page. To take a course you join the community, which needs an Anyza account. See Certificates and public course pages.

Payment QR code generator (Pay)

Address: anyzapay.com/qr. Free, no sign-up.

It builds a QR code to get paid in Bitcoin, Lightning, USDC · Solana or USDT · Solana. The money goes straight to the address you type; Anyza doesn't receive, hold or charge anything.

1. Choose the Network and paste your address (for Lightning, your Lightning Address).
2. Optionally enter an Amount (optional) in any of 17 currencies or in sats. It's converted at the current rate. Without an amount, the payer types it.
3. Optionally add a Description (optional).
4. Tap Generate QR code. Download it as PNG or SVG, or use Copy link.

Before generating, it checks that the address belongs to the chosen network, that a Bitcoin address's check digit matches and that a Solana address is a regular wallet. With Lightning and an amount, it asks your provider for an invoice that expires soon; without an amount, it creates a fixed QR you can print and use forever. USDT on Tron or Ethereum doesn't work with this QR. Make a small test payment before printing.

Crypto address checker (Pay)

Address: anyzapay.com/address. Free, no sign-up.

Paste an address, invoice or Lightning Address. It tells you the network (Bitcoin, Tron, Ethereum and other EVM networks, Solana, Lightning Address, Lightning invoice, LNURL), whether it's typed correctly and what you must not send to it. For a Lightning Address, Check it exists shows whether it responds and the provider's limits. It warns you if what you pasted looks like a seed phrase or private key. The check runs in your browser: the address isn't sent or saved. From the result, Generate a QR to receive here opens the QR generator already filled in.

Crypto converter (Pay)

Address: anyzapay.com/convert. Free, no sign-up.

It converts bitcoin, sats, Solana, USDC and USDT to and from 17 currencies (dollar, real, euro and 14 more). It opens in your language's currency. Fill in Amount, From and To; Swap inverts them. It also shows Rates right now and Most searched conversions.

Each conversion has its own page, such as anyzapay.com/convert/100-brl-to-sats or anyzapay.com/convert/1-btc-to-usd, with tables in both directions. Short addresses like anyzapay.com/convert/btc-brl are redirected to the right page.

Sources: Bitcoin from mempool.space (every minute), Solana from Jupiter (every 5 minutes), USDC and USDT at 1 dollar, and currencies at the day's reference exchange rate. It's a reference price without fees: exchanges and wallets use their own price and charge fees.

Common questions

Do I need an account? No, except to sign at level 2 (Anyza account) in the digital signature. The course showcase is open to browse; taking a course means joining the community.

Is it really free? Yes. The limits per day exist only to prevent abuse.

Does Anyza keep my files? No. The timestamp and the signature calculate everything in your browser and never upload the file.

Timestamp or signature? The timestamp only proves the date and keeps the file untouched (you keep a separate .ots). The signature adds your message and identity inside the file, so whoever receives it can check it on its own.

Tips

• Keep the original file and its .ots together, with a backup. Without either one, the timestamp can't be checked.
• For a valuable prize, use the Bitcoin network in the giveaway and share the link before the result comes out.
• Use the address checker before sending crypto to an address you've never used.