Sumatra PDF: when to install it, and when not to
A small, fast PDF reader that opens a document before a full office suite has finished loading. It is the right first install on an older machine and a…
The short version
Sumatra PDF: Opens PDFs in under a second, remembers where you stopped reading, and has exactly no upsell. It also reads epub, mobi and cbz. There is nothing to configure, which is the whole appeal.
| Licence / price | Free · Open source |
|---|---|
| Platforms | Windows |
| Category | Documents & Notes — 8 programs |
| Official download | https://www.sumatrapdfreader.org/download-free-pdf-viewer ↗ |
What it is for
A small, fast PDF reader that opens a document before a full office suite has finished loading. It is the right first install on an older machine and a sensible companion on any machine.
When to pick something else
It is a reader, not an editor, and it is Windows-only. If your job is creating or filling PDF forms, PDF24 Creator or the editor's own export is the correct tool.
How it compares in Documents & Notes
These are the alternatives we would consider for the same job. The notes are the same ones used on the main list, so there is no separate ranking hiding on this page.
| Program | Licence / price | Platforms | Why it is on the list |
|---|---|---|---|
| PDF24 Creator Publisher's site ↗ | Free · Closed source | Windows | The offline alternative to those 'free online PDF tools' that quietly upload your contracts to a stranger's server. Merge, split, compress, OCR, all on your own machine. |
| LibreOffice Publisher's site ↗ | Free · Open source | Windows, macOS, Linux | A complete office suite with no account, no telemetry and no ribbon. Opens and saves .docx and .xlsx reliably enough for everyday work. Install it even if you own Microsoft Office, as a second opinion on stubborn files. |
Practical notes
- Make it the default PDF handler so double-clicking a document does not launch a browser.
- Keep the viewer updated; PDF is a complex format and this is often how untrusted files arrive.
Questions people ask
Can it fill in forms?
Some, but it is not a form editor. Use a dedicated creator for that job.
Where it appears in our guides
- Setting up a new Windows PC: the order that actually works
- When free software is enough, and when it is not
- Getting a few more years out of an older PC
See the full Documents & Notes explainer for the other 7 programs in this category.
How to read this page. How to read this page. Platform, licence and publisher details come from our directory data. Where an independent review, audit or survey is mentioned, it is summarised in our own words with the source named and linked; our /sources page sets out that policy. The recommendation, the trade-offs and every 'skip it if' line are our editorial judgement. We do not run benchmarks, publish measured performance figures or host installers, and every download link goes to the publisher's own site. If a detail is out of date, our About page explains how to tell us.