ApexPDF: free PDF tools that run entirely in your browser

About ApexPDF

ApexPDF is a free PDF suite built around one rule: your files never leave your computer. Its about page explains the motivation plainly: most free PDF sites make you upload tax returns, contracts and IDs to their servers, and once you upload you lose control. ApexPDF instead runs established PDF libraries, such as pdf-lib and MuPDF, inside your browser through WebAssembly, so the work happens on your own CPU.

The toolkit is broad, with more than 100 tools by its own count and conversion across 40-plus formats. Merging is visual: you can drag in many PDFs and reorder not just files but individual pages, then split by ranges or extract every page. There is OCR, conversion to and from other formats, and batch processing with no caps on the number of files. Once loaded it works offline, and it runs on phones and tablets as well as desktops. For advanced users, a settings panel can connect optional processing modules such as PyMuPDF, Ghostscript and CoherentPDF.

It is free with no sign-up, subscription, watermark or usage limits, according to its FAQ.

Because everything runs locally, very large files or big batches depend on your device's power and memory, so an older phone will be slower than a laptop.