n8n-io/n8n · error

Attachment exceeds maximum size of 10.0 MB (got ${actualByte

Error message

Attachment exceeds maximum size of 10.0 MB (got ${actualBytes})

What it means

Error "Attachment exceeds maximum size of 10.0 MB (got ${actualBytes})" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/instance-ai/src/tools/attachments/parse-file.tool.ts:141

	return (
		inputFormat ??
		toOutputFormat(attachment && detectFormat(attachment.fileName, attachment.mimeType))
	);
}

function emptyTabularFields() {
	return {
		columns: [],
		rows: [],
		totalRows: 0,
		returnedRows: 0,
	};
}

function extractPlainTextContent(attachment: AttachmentInfo) {
	const decoded = Buffer.from(attachment.data, 'base64');
	if (decoded.length > MAX_DECODED_SIZE_BYTES) {
		throw new Error(formatSizeLimitMessage(decoded.length));
	}

	const content = decoded.toString('utf-8').trim();
	if (!content) {
		throw new Error(`"${attachment.fileName}" contains no extractable text.`);
	}

	if (content.length > MAX_RESULT_CHARS) {
		return { content: content.slice(0, MAX_RESULT_CHARS), truncated: true };
	}

	return { content, truncated: false };
}

export function createParseFileTool(context: InstanceAiContext) {
	return new Tool('parse-file')
		.description(
			'Parse parseable user attachments from the current message. ' +

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/instance-ai/src/tools/attachments/parse-file.tool.ts:141 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/decc173ee8c7d8c0. Report an issue: GitHub.