Predictable Pricing
PdfKong operates on a pure pay-as-you-go wallet credit system. There are no monthly subscriptions. You can top up starting from $1 ($1 = 100 paid credits) with lifetime validity. Unused credits never expire.
Credit Costs
Costs are calculated per document, completely independent of the resulting page count. Failed conversions are never charged.
HTML / Markdown / URL
Charged exactly 1 credit per successful generation.
Office Document
Charged exactly 2 credits for Word, Excel, PPT, or text files.
Free Credits Monthly Refill
- Every developer receives 100 free credits immediately upon registration.
- A background scheduler checks accounts periodically. If a month has passed since your registration date (or last refill), your Free Credits balance is automatically refilled back to 100 free credits.
- Note: Free credits do not stack. The maximum cap is 100.
- Paid Credits are completely untouched and unaffected by the monthly free refill cycle.
Account Levels & Batch Limits
Your account tier is determined dynamically based on the total accumulated lifetime credits that have entered your account. Upgrades happen immediately, and you will never be downgraded.
Concurrency Limit
There is a hard limit on concurrent batches running simultaneously per user based on your account level (e.g., 2 concurrent batches for Pro, 5 concurrent batches for Business). Any additional batches dispatched will wait safely in the queue until your active batches complete processing.
Consumption Priority
- Paid Credits First: When a PDF is generated, the API automatically deducts the cost from your Paid Credits balance first.
- Free Credits Second: If your paid credits are exhausted, any remaining cost is automatically deducted from your Free Credits balance.
- Rejection (HTTP 402): If your total combined balance (Paid + Free) is lower than the required cost, the API immediately rejects the request with an
HD-A002error (Insufficient Balance).