PDF tools

Eighteen file tools — convert, merge, split, extract, reorder, number, compress, watermark, crop, sign, protect, fill, inspect and compare — that read your PDF in this browser and write the result back to it. No file is uploaded, because there is no upload.

The password tool is the one to read twice. It encrypts with AES-256 through QPDF compiled to WebAssembly and running in this tab, so the page content really is closed without the password: this site cannot open it afterwards, cannot reset it and keeps no copy. Remove a password you already know, add one, or set it again — and write the password down before you close the tab, because an encrypted file with a password nobody holds is an encrypted file nobody can read.

The rest of the desk works by copying rather than redrawing wherever it can. Merging, splitting, extracting and reordering copy the pages themselves, so fonts, images and vector drawings arrive at their original quality and a file that keeps text keeps it selectable. Compressing in repack mode also leaves text alone; compressing in picture mode does not, and the page says so before you run it.

Four things this desk will not do, stated on the pages themselves. It will not read a scanned page as text — that needs OCR, and OCR guesses. It will not place a cryptographic signature; the signature tool stamps a picture, which is not the same thing. It will not redact: cropping hides content and leaves it in the file, so a confidential footer must be removed elsewhere. And it will not promise a smaller file: a compressor that produces a larger one says so and tells you to keep the original.

Every input is checked by its first bytes rather than by the name it was given, so a renamed file is refused instead of misread. Limits are 50 MB for one file, 150 MB in total and twenty files in one run, because all of it is held in the tab’s memory. Encrypted files are refused with a pointer to the protector, and an output that would write more than 100 files is refused rather than flooding your downloads folder. Closing the tab cancels the work and drops everything.

Everything here runs offline, with the PDF library and the encryption engine served from this site’s own files rather than from a content network somewhere else. Nothing about your document — its name, its pages, the passwords you type — is sent to a server, written to a log or kept after the tab closes.