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First-Fit Decreasing Bin Packer

Pack positive sizes into fixed-capacity bins using a documented heuristic.

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First fit decreasing bin packing online

Pack positive sizes into fixed-capacity bins using a documented heuristic. Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

How to use it

Paste JSON matching the structure in the example. Set bin capacity. Choose Run tool. Review the output, then copy or download it.

Options and example settings

Option	Choices / value	Example default
Bin capacity	Enter bin capacity.	10

Worked examples

Use this when inspecting structured input or preparing a data or code artifact. Generated commands and configurations remain text until you review and use them yourself.

Reproducible worked example

Settings: Bin capacity: 10

Input:

[8,7,6,5,4,3,2,1]

With the input and settings above, the tool produces:

Output:

{
  "capacity": 10,
  "bins": [
    {
      "used": 10,
      "items": [
        {
          "size": 8,
          "index": 0
        },
        {
          "size": 2,
          "index": 6
        }
      ]
    },
    {
      "used": 10,
      "items": [
        {
          "size": 7,
          "index": 1
        },
        {
          "size": 3,
          "index": 5
        }
      ]
    },
    {
      "used": 10,
      "items": [
        {
          "size": 6,
          "index": 2
        },
        {
          "size": 4,
          "index": 4
        }
      ]
    },
    {
      "used": 6,
      "items": [
        {
          "size": 5,
          "index": 3
        },
        {
          "size": 1,
          "index": 7
        }
      ]
    }
  ]
}

For this input, “capacity” is 10. These are the named fields in the example output.

Limitations and common mistakes

First-fit decreasing is a heuristic and does not guarantee the fewest possible bins.
Combined input is bounded to 150,000 characters; output text is bounded to 1.2 million characters. Some algorithms impose smaller limits, stated in their error messages.

Frequently asked questions

What format should I enter?

Paste JSON matching the structure in the example. The worked example shows the supported structure and actual output.

How can I pack values with first-fit decreasing online?

Paste JSON matching the structure in the example. Set bin capacity. Choose Run tool. Review the output, then copy or download it.

Where is my input processed?

The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.