Twenty tools for the things people do to PDFs. All of them work on your own machine: nothing is uploaded, and there is no account.
Tools that work out what is inside a document.
Type an answer once and place it on every line that asks for it. Works on any form, including scans.
Turn a PDF bank statement into a verified spreadsheet.
One form, filled once for every row of a spreadsheet.
See exactly which words changed between two versions.
Read a scan with OCR so the document can be searched.
Type your details once; they fill every building and trade permit.
Who needs a form, by when, and what late filing costs.
One PDF per sheet, named from the title block.
Measure runs, areas and counts off a drawing.
Paste a spreadsheet, get print-aligned label sheets.
Change which pages are in a document.
Change how pages sit and what is stamped on them.
Turn sideways or upside-down pages the right way up.
Put pages into the order you want.
Stamp numbers in any corner, in three formats.
Add DRAFT, CONFIDENTIAL or your own text.
Add text in any font and color, white out a wrong value and type over it, highlight or box.
The page is re-rendered with the box burned in, so the text is removed rather than covered.
Place a signature, initials, date or stamp, then download it signed.
Trim whitespace from page edges.
Cloud tools meter usage because every task costs them server time. Nothing here runs on a server, so there is nothing to ration.
There is a speed consequence too, and it runs the right way: a cloud tool has to upload your file, wait in a queue, process it, and send it back. Working on the file where it already sits skips all three. In testing, a 2,000-page document rotated in about a second and a 660 MB merge finished in five and a half.
The 50 MB ceiling is the one real limit here, and it comes from measurement rather than caution. Memory use runs at roughly four to five times the file size, and it is your memory. At 50 MB every operation finishes in under a second and peak memory stays near 140 MB, which a phone handles comfortably. At 80 MB it reaches 370 MB, and mobile browsers start reloading the tab with no warning and no saved work. One ceiling that holds on every device is better than a higher one that fails on the device you happen to be holding.
Most PDF sites list a few tools they cannot do, and hand back a file that technically opens. These are absent because they cannot be done honestly in a browser, and shipping a version that half works would be worse than not having it.
If you need those four, the honest answer is that better options exist. Stirling PDF self-hosted via Docker covers over fifty operations including compression and passwords, and stays entirely under your control. PDF24 Creator is a free Windows desktop app that works offline. Your own PDF reader's "reduce file size" export usually beats any web compressor. We would rather point you at those than pretend.
PDFeyes
Type it once. It shows up everywhere it needs to: across every page, every document in the packet.
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