Good to know (known limitations)

Pagemint is honest about what each tool does, so your visitors are never surprised. Most points below are also explained on the tool's own page.

Tools that run in the browser

The visitor's device does the work. Files never leave it, which keeps your server costs at zero, but very large files (tens of megabytes, hundreds of pages) can be slow or run out of memory on older phones. Each plan sets the largest file a tool accepts (100 MB on the free plan, 250 MB and 500 MB on the sample paid plans).
Plan limits for these tools (file size, files per task) are applied in the browser. A technical visitor could get around them; these tools cost you nothing to run either way. Server conversions and credits are always checked on the server.

Conversions

Tool	What you get
Word, Excel, HTML to PDF	Convert to PDF gives pages as pictures: they look exactly right, but the text cannot be selected or searched. Print or save as PDF opens the browser's print window and gives selectable text. For server-side conversion with selectable text, add the LibreOffice engine (VPS).
PDF to Word	Editable text keeps paragraphs, headings and right-to-left text; tables become lines of text and pictures are left out. Exact look puts each page into Word as a picture.
PDF to Excel	Each page becomes a sheet and table columns are lined up from the text positions. Works best with tables made by a computer.
PDF to PowerPoint	Each page becomes a slide with the page as a picture (it looks the same; the text is not editable).
PDF to text	Plain text or Markdown with headings.
HTML to PDF	Scripts inside the HTML file never run (for safety). Pictures from other websites appear only when that website allows it.
PowerPoint to PDF, PDF to PDF/A	Need an optional engine (LibreOffice / Ghostscript on a VPS, or an iLoveAPI account). Without one, these two tools stay hidden.

Scanned documents

There is no text recognition (OCR). A scanned page is a picture of text, so PDF to Word, Excel or text explain that no text was found. Scan to PDF, compression, merging and the other page tools work on scans as usual.

Other tools

Compress PDF: Light and Recommended shrink the pictures inside the PDF and keep the text. Extreme and the exact-size targets (100 KB, 200 KB…) turn pages into pictures, so the text can no longer be selected. When a file is already well optimized, the original is kept.
Repair PDF rebuilds a damaged file's structure. Content that is missing from a damaged file (for example the end of a file that was cut off while downloading) cannot be brought back: such pages may come back empty.
Unlock PDF needs the file's password; it never guesses passwords.
Compare PDF compares the text of two versions, not their look.
Writing text into PDFs (editor, watermarks, page numbers, signatures) uses the bundled Noto fonts for Latin, Greek, Cyrillic, Vietnamese, Arabic and Hebrew. Chinese, Japanese, Korean and many Indian scripts need a font added by a developer.

Hosting

Shared hosting runs everything above except the optional server engines, which need programs that shared hosts rarely allow (see Server conversions in configuration).
Background work (plan reminders, server conversions, cleanup) runs from the one cron job; there is no separate queue worker to keep running. To stay within shared-hosting limits, the cron job runs one server conversion per minute: on a busy site with a server engine, members may wait a few minutes in line. Browser tools never wait.