Smallpdf is a good product with a large user base, and it would be dishonest to pretend otherwise. It is also built on an architecture fundamentally different from ours, and that difference is the whole basis for choosing between them.
This comparison is written by the people who make PDF Vault, so read it with that in mind. We have tried to be accurate about where Smallpdf is the better tool.
The architectural difference
Smallpdf is server-based. You upload a file, their infrastructure processes it, and you download the result. Files are held for a retention window and then deleted according to their policy.
PDF Vault is client-based. The file is read into your browser's memory, processed there by WebAssembly, and written back to your disk. No upload occurs at any point.
Everything else follows from that.
Where Smallpdf is genuinely better
Very large files and heavy OCR. Server GPUs beat a laptop CPU. If you are processing gigabyte-scale scan archives or running OCR across thousands of pages, Smallpdf will finish sooner.
Low-powered devices. Local processing needs local memory. On an old Chromebook or an entry-level tablet, a server-based tool shifts the work somewhere more capable.
Team and integration features. Smallpdf has an established business tier, Google Drive and Dropbox integrations, and shared team workflows. We do not, because those features generally require holding your files.
Maturity. They have been at this longer, across more edge cases, with a larger support organisation.
Where local processing wins
Confidential documents. There is no retention window, no third-party storage, no employee access, and no breach of ours that could ever involve your files. For contracts, medical records, tax documents and discovery material, this is not a marginal advantage.
Corporate DLP. No outbound file transfer means nothing to log and nothing to explain to your security team.
Everyday speed. For ordinary files, skipping the upload and download entirely is faster in wall-clock terms, even though the server is a faster computer.
Genuine offline use. Install PDF Vault as a PWA and every tool works on a plane. A server-based tool cannot do this at any price.
Verifiability. You can open the Network tab and confirm nothing is transmitted. Server-based privacy claims can only ever be taken on trust.
Pricing
- Smallpdf — a limited number of free daily tasks; paid plans run around $12 a month billed yearly.
- PDF Vault — three free operations a day with no account required; Pro from $10 a month billed yearly.
Both free tiers are capped. Ours requires no account or email address, which is a small thing that some people care about quite a lot. Check current pricing on both sites before deciding, since these things change.
How to decide
Choose Smallpdf if you need team features and cloud storage integrations, routinely process very large files, work on low-powered hardware, or simply prefer an established vendor with a large support organisation.
Choose PDF Vault if you handle confidential documents, work somewhere with a DLP policy, want tools that function offline, or object on principle to uploading a private document to run a routine operation on it.
For many people the honest answer is both: a server tool for the occasional enormous batch job, and a local tool for everything sensitive. They are not mutually exclusive, and neither of us charges you for having a preference.