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AV-H07

HID Report Descriptor Decoder

Decode a USB HID report descriptor item by item, lay out every report bit by bit and catch mistakes hosts reject.

● Runs on your device; nothing is uploaded

How to use it

  1. Paste the descriptor as hex bytes, a 0x list or a C array (comments are ignored), or pick an example.
  2. Read the problems list for anything a host might reject.
  3. Check the Reports tables for bit offsets, sizes and the length of each Input, Output and Feature report.
  4. Use the Items table, or copy it as a commented C array, to review each item.
  5. Optionally choose a connected device under WebHID to see the reports your browser parsed from it.

Limits

Pasted text
64 KB
Item data sizes
0, 1, 2, 4 bytes (+ long items)
Push nesting before warning
16
Field flagged as large
> 4 KB (Size × Count)
Linux limits checked
Report Size ≤ 256, Report Count ≤ 12,288
Warnings listed
50
Features
  • Decodes every main, global and local item per HID 1.11, including Push/Pop and 4-byte extended usages
  • Signed Logical/Physical values and 4-bit Unit Exponent, with units decoded (e.g. English Rotation: deg)
  • Per-Report-ID layout with bit offsets and byte lengths, counting the Report ID byte
  • Names for Generic Desktop, Simulation, VR, Game, Keyboard, LED, Button, Consumer, Digitizer and PID (force feedback) usages
  • Plain-language warnings: unbalanced collections, Usage Minimum without Maximum, missing Report Size/Count, Report ID 0, truncated bytes
  • WebHID view of a connected device’s collections in Chrome and Edge

For AI agents: avtools_hid_descriptor

AV-H07 · HID Report Descriptor Decoder

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