Intel HEX File Editor

This tool lets you create and edit Intel HEX files record by record. Each record consists of a start code (:), byte count, 16-bit address, record type, data bytes, and a checksum. The checksum is auto-calculated as the two's complement of the sum of all bytes in the record (byte count + address + type + data).

Click "Add Record" to append a new row. Click "Load" to import an existing .hex file. Click "Save" to download the result. The raw output area shows the file as it would be written to disk, click "Copy" to copy it to the clipboard.