MAILTO max-length of each internet browsers?

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Safari and most email clients have no hard limit (depends on available CPU and RAM)

2015 Web Browser Testing:

  • Safari
    • 705000000
    • 2 minutes
    • Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/601.1.56 (KHTML, like Gecko) Version/9.0 Safari/601.1.56
    • limited by 16GB RAM
  • Firefox
    • 268435455
    • 20 seconds
    • Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:41.0) Gecko/20100101 Firefox/41.0
    • limited by maximum string length
  • Chrome
    • 2097132
    • 1 second
    • Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36
    • limited without explanation
  • IE
    • 2029
    • 5 seconds
    • Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; rv:11.0) like Gecko
    • limited without explanation

2015 Email Client Testing:

  • Mozilla Thunderbird
    • 2097132 works in 1 second
    • 268435455 uses 100% CPU for 2 minutes but fails to render the body and is not usable
    • version 38.3.0
  • SeaMonkey
    • 2097132 works in 5 seconds
    • 268435455 uses 100% CPU for a long time (more than 5 minutes)
    • version 2.38
  • Apple Mail
    • 500000 works in 14 seconds
    • 2097132 uses 100% CPU for a long time (more than 5 minutes)
    • version 8.2
  • Microsoft Outlook
    • trims to 2070 in 1 second
    • version 2013

2017 update

Chrome 61 still works with 2097132 length on macOS (16 GB RAM);

navigator.userAgent;
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36"
location.href="https://stackoverflow.com/questions/13317429/mailto:?body="+'a'.repeat(2097132);

According to @Chloe on windows (32 GB RAM) it’s limited to 1800;

"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36"

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