convert · pdf
Merge PDF files online
Combine between 2 and 20 PDF files into one document, up to 10 MB total input, in under 30 seconds; after 20 free runs a day, each run costs 1 credit per 20 pages.
result
Press Run. The result lands here, made by the real tool.
1 credit per 20 pages, minimum 1 · ≤10 MB · ≤30 s · no login · 20 free/day
Keys are stored in this browser only. A key lets you buy credits and keep going after the free runs.
How it works
- Choose between 2 and 20 PDF files using the file picker and set whether to keep their bookmarks.
- Press Run; the files are merged in the order you arranged them.
- Download the resulting merged.pdf and check the reported page count and file count.
Limits
You may supply between 2 and 20 files with a combined input size of 10 MB; the merged output may reach 50 MB and the combined page count may not exceed 2000 pages. Each run completes within 30 seconds. Twenty runs a day are free with no login required; beyond that, each run costs 1 credit per 20 pages, minimum 1 credit.
Privacy
Your files are processed for the request and discarded immediately afterwards; they are not stored or used for any other purpose. Usage records retain only the time, tool name, status, duration, credits used, and a salted hash of the IP address.
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Call it from code
curl -sS -X POST 'https://data.voiddo.com/v1/pdf_merge?download=1' \
-F 'input={}' \
-F 'files=@input1.pdf' \
-F 'files=@input2.pdf' \
-o result.pdf20 calls a day need no key. Beyond that: one-time credit packs, $5 for 500 credits, $9 for 1,000 credits, $29 for 4,000 credits. Get credits · llms.txt · OpenAPI.
Questions
Are my files kept after the merge?
No. Input files are discarded once the request is complete and are not stored or used for anything else.
How do I call this from code?
Send a POST request to https://data.voiddo.com/v1/pdf_merge with your files; a curl example is shown on this page.
What happens once I have used my 20 free runs?
Further runs are paid with prepaid credits attached to an API key, at 1 credit per 20 pages with a minimum of 1 credit per run.
Can I control the order of the pages?
Yes. The files are merged in the order you place them in the file picker, so arrange them before pressing Run.
Will bookmarks from the original files be preserved?
Only if you enable the keep bookmarks option before running; otherwise the outlines from the input files are not carried into the merged document.