PostScript to MOBI Converter

Convert PostScript to MOBI Online

PostScript (.ps) is Adobe's fixed-layout print language — it describes exactly where every glyph and line sits on a finished page. MOBI is the legacy Amazon Kindle ebook format, which is reflowable: text re-wraps to fit whatever screen and font size the reader picks. This converter extracts the text and embedded images from a PostScript print stream and pours them into a reflowable MOBI ebook, so a legacy .ps document becomes something you can read comfortably on an older Kindle. Because the two formats are built on opposite principles, the precise page geometry does not survive — that trade-off is explained below, along with when a fixed-layout target is the better choice.

PostScript (PS) Format at a Glance

MOBI Format at a Glance

How to Convert PostScript to MOBI

1. Upload Your PostScript File: Drag and drop your .ps file onto the page or click "+ Add Files" to pick it from your computer. You can queue several files and convert them with the same settings.
2. Confirm MOBI as the Output Format: MOBI is preselected as the target. The conversion produces a reflowable ebook carrying the extracted body text, basic styling, and inline images from the PostScript stream.
3. Review the Advanced Options (Optional): The panel notes "Our defaults are optimized for the best results. We recommend you keeping the defaults unless you have a specific need." For most single-column PostScript documents the defaults give the cleanest reflow, so leave them unless you have a reason to change them.
4. Convert and Download: Click "Convert" and download the .mobi file, then sideload it onto your Kindle over USB. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared.

Why Convert PostScript to MOBI?

PostScript is a print format with no native readers left in everyday use, and a Kindle cannot open a .ps file at all. MOBI turns the document into a proper reflowable ebook so an older Kindle can resize the type, adjust margins, track reading progress, and use dictionary lookup. The most common reasons people make this conversion:

• Reading legacy documents on an older Kindle — Kindle Keyboard, Touch, Paperwhite 1-4, Voyage, and basic Kindles all open MOBI natively, with full font scaling and reader features the original PostScript never offered.
• Keeping a pre-2023 MOBI library consistent — readers who collected MOBI before Amazon's switch to EPUB often keep adding to that same format and folder so the whole library behaves the same on the device.
• Sideloading without Amazon's cloud — MOBI still copies straight into a Kindle's documents folder over USB, or through Calibre, even though Amazon's Send to Kindle service no longer accepts it.

If you have a newer Kindle (2022 or later) or want broad e-reader support, PS to EPUB is the better target — Amazon recommends EPUB and it works on Kobo, Apple Books, and others too. And if the layout matters more than reflow — multi-column journals, equations, figures — keep it fixed with PS to PDF, the format PostScript was effectively built to become.

Frequently Asked Questions

Will the MOBI look like the original PostScript page?

No, and that is the nature of MOBI. PostScript is fixed-layout and MOBI is reflowable, so the text re-wraps to the Kindle's current font size and screen width. The body text and inline images come through, but the original columns, line breaks, margins, page numbers, and exact positioning are discarded — they are re-laid out as a single flowing column. If you need the page to look exactly as authored, convert PS to PDF instead, since PostScript and PDF are close relatives and that conversion is faithful in appearance.

Is MOBI still worth using, or should I pick EPUB?

MOBI is a legacy format. Amazon ended MOBI support in its Send to Kindle service in December 2023 and stopped accepting MOBI for new KDP uploads on March 18, 2025, recommending EPUB instead. MOBI is still the right choice when you specifically need maximum compatibility with older Kindle hardware or want to add a file to an existing sideloaded MOBI library. For a newer Kindle or cross-reader portability, use PS to EPUB — Amazon's Send to Kindle accepts EPUB and converts it to the on-device Kindle format automatically.

Why do my equations and figures come through as images?

Math, formulas, and figures in PostScript are commonly drawn as vector outlines rather than live characters, so there is no underlying text for the converter to reflow — they survive only as flattened graphics that don't resize with the rest of the text. This is a limitation of how the source PostScript was written, not the conversion. A fixed-layout PS to PDF conversion keeps equations and figures sharp and in their original position.

Why is some text missing or showing as boxes?

This usually means the source PostScript used a custom or Type 3 font that wasn't fully embedded, so the converter can't map those glyphs back to characters. Re-export the original with all fonts embedded if you can, or route through PS to PDF first, which often resolves font-mapping issues before the ebook step.

How do I get the converted MOBI onto my Kindle?

Connect the Kindle to your computer with a USB cable; it mounts as a drive. Open the documents folder, drop the .mobi file in, then eject and disconnect — the book appears in your library on the next sync. The same file also opens in the Kindle apps for PC, Mac, iOS, and Android, plus Calibre, KOReader, and FBReader. Note that you cannot email a MOBI through Send to Kindle anymore; for that path you need EPUB.

Is there a file size or page count limit?

The converter handles large PostScript documents, including long technical reports and manuals. Conversion runs on our servers, so the practical limit is upload size and your connection speed rather than a hard cap. Very large or image-heavy files take longer to upload than to convert. In our testing, a single-column PostScript paper converts to a clean, navigable MOBI, while a dense multi-column journal page loses its layout to reflow — keep your original .ps as the master copy and convert from it whenever you need a different format.

How are my files handled, and how long are they kept?

Your .ps file is uploaded over an encrypted connection and processed on our servers; this conversion needs a PostScript interpreter, so there is no in-browser-only mode for it. Files are deleted automatically a few hours after conversion and are never shared or made public. No account or sign-up is required, and the output .mobi carries no watermark.

Does the converter handle a multi-page PostScript document?

Yes. A PostScript print stream describes a whole document — one showpage per printed page — and the converter walks the entire stream, pouring the text and images from every page into one continuous reflowable MOBI. Because MOBI reflows, the original page breaks are not kept as hard boundaries; the content becomes a single flowing sequence that the Kindle re-paginates to its own screen and font size. If you need the original page divisions preserved exactly, convert PS to PDF instead, which keeps each page intact.