PDFcubPDFcub is a set of free PDF tools that work right in your web browser: converting PDFs to images and back, compressing, removing pages, turning other documents into PDF and pulling text out of a PDF.
Your files stay on your device
Every tool on this site does its work inside your browser tab. When you pick a file, it is read and processed by code running on your computer or phone — it is not sent to our server, and we never see its contents. You can check this yourself: open your browser’s developer tools, go to the Network tab and run a tool — your file does not appear in any request.
This also means the limits are honest ones. A very large file can take longer or run out of memory on an older phone; if that happens, the tool says so instead of silently failing.
How the tools are tested
Each tool is built from a written specification and comes with automated tests before it goes live:
- Logic tests with sample files, where the expected result (number of pages, image size, extracted text) is worked out independently, not copied from the tool’s own output.
- Browser tests that use the tool the way a person would: open the page, drop in a file, get the result — plus a wrong file type and an edge case such as an empty or one-page document.
When a page states a fact about a file format, it links to the source, such as the published PDF specification.
Who runs the site
PDFcub is run by a small independent team. The site is free to use and does not require an account.