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Compression

APNG IDAT/fdAT Chunk, Streaming Deflate Replay and Disposal Method Frame-Timing Analyzer

Upload a PNG or APNG and audit the whole animation structure: PNG signature and per-chunk CRC32 checks, IHDR bit depth / color type / interlace, acTL placement and declared frame counts, every fcTL (region bounds inside the canvas, normalized delay fractions, dispose_op none/background/previous, blend_op source/over), the shared fcTL+fdAT sequence-number contract from 0, per-frame replay of the IDAT/fdAT deflate streams with exact decompressed-size verification, and disposal-semantics audit — first-frame PREVIOUS treated as BACKGROUND, zero-delay frames, loop counts, fps and compression ratios.

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Quick start

Call this tool from your code in three languages.

cURL
# 1) Request a presigned URL → returns { uploadUrl, storageKey }
curl -X POST 'https://api.elysiatools.com/api/upload/presign/apng-idat-fdat-chunk-streaming-deflate-replay-and-disposal-method-analyzer' \
  -H 'Content-Type: application/json' \
  -d '{"filename":"pngFile.ext","contentType":"application/octet-stream","size":12345}'

# 2) PUT the file bytes directly to the presigned uploadUrl
curl -X PUT '<presigned uploadUrl>' \
  --data-binary @/path/to/file.ext

# 3) Call the tool, passing the returned storageKey for each file field
curl -X POST 'https://api.elysiatools.com/en/api/tools/apng-idat-fdat-chunk-streaming-deflate-replay-and-disposal-method-analyzer' \
  -F 'pngFile=uploads/2026/01/01/your-tool-1700000000000-abc123.ext' \
  -F 'verifyDeflate=true'

© 2026 Elysia Tools. Developer documentation.

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API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP
POST https://api.elysiatools.com/en/api/tools/apng-idat-fdat-chunk-streaming-deflate-replay-and-disposal-method-analyzer

Parameters

NameTypeRequiredDescription
pngFilefileupload requiredYes—
verifyDeflatecheckboxNo—
File-type parameters must be uploaded first via POST /upload/apng-idat-fdat-chunk-streaming-deflate-replay-and-disposal-method-analyzer, then the returned filePath is passed to the corresponding file field.

Response format

HTML result

JSON
{
  "result": "<div>Processed HTML content</div>",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json
{
  "mcpServers": {
    "elysiatools-apng-idat-fdat-chunk-streaming-deflate-replay-and-disposal-method-analyzer": {
      "name": "apng-idat-fdat-chunk-streaming-deflate-replay-and-disposal-method-analyzer",
      "description": "Upload a PNG or APNG and audit the whole animation structure: PNG signature and per-chunk CRC32 checks, IHDR bit depth / color type / interlace, acTL placement and declared frame counts, every fcTL (region bounds inside the canvas, normalized delay fractions, dispose_op none/background/previous, blend_op source/over), the shared fcTL+fdAT sequence-number contract from 0, per-frame replay of the IDAT/fdAT deflate streams with exact decompressed-size verification, and disposal-semantics audit — first-frame PREVIOUS treated as BACKGROUND, zero-delay frames, loop counts, fps and compression ratios.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=apng-idat-fdat-chunk-streaming-deflate-replay-and-disposal-method-analyzer",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call
{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "apng-idat-fdat-chunk-streaming-deflate-replay-and-disposal-method-analyzer",
    "arguments": {
  "pngFile": "https://example.com/file.ext",
  "verifyDeflate": true
}
  }
}
Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).
File parameters accept a public file URL only (https://…). Local paths, data: URIs, and Base64 strings are not supported.

Questions or issues? Contact [email protected]

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