Opo Codes

Email QR code generator

An email QR code opens a new message with the address, and if you like the subject and the text, already filled in, so a customer only has to press send. Opo Codes makes it for free in your browser, with no account, and reads it back to check it before you print.

Open the generatorFree. Runs in your browser.

How to do it

  1. Open the generator with Email already selected.
  2. Type the address people should write to. Add a subject and a message if you want them pre-filled.
  3. Check the VERIFIED stamp. If the address is not valid, no code is made and the field says so.
  4. Download the code and print it on a flyer, a parcel slip or a shop sign.

What is inside the code

The code holds a mailto: link, the standard form for email links. Worked example: the address [email protected], subject Order enquiry, and a message of two lines, Hello, then I would like a quote. The code holds mailto:[email protected]?subject=Order%20enquiry&body=Hello%2C%0D%0AI%20would%20like%20a%20quote.

Spaces become %20, the comma becomes %2C and the line break becomes %0D%0A. The generator does this encoding for you. A question mark, ampersand, hash, percent sign or equals sign typed inside the address itself is encoded too, so it cannot end the address early.

Keep it useful and short

A subject lets you sort what arrives, for example one subject per flyer. A line break in the subject is turned into a space, because a subject is one line.

Pre-filled text is optional. A short body keeps the code light, and a light code scans from further away at the same printed size.

Check the address

The generator accepts an address that looks like [email protected]: some text, an at sign, then a domain with a dot. It cannot know whether the mailbox exists, so send one test message from the printed code before a big print run.

Questions

Which email app opens?

The phone opens whichever app is set up for mailto: links. Which one that is depends on the phone.

Can I send to more than one address?

The form takes one address. Use a shared mailbox or a group address if several people should receive the messages.

Can I change the address after printing?

No, the address is inside the picture. Print a new code if it changes.

Is my message uploaded?

No. The code is built in your browser and nothing is sent to a server.

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