OpenAnyFile
What is a .rds file?
R Serialized Object is a data format developed by R Foundation. It is usually created by R (saveRDS).
One R object, gzip-compressed by default; readRDS() restores it. Not readable outside R.
File details
| Full name | R Serialized Object |
|---|---|
| Category | Data & science |
| MIME type | application/x-rds |
| Signature (magic bytes) | 1F 8B (gzip) |
| Developer | R Foundation |
| Opens with | Universal inspector |
| Uploaded? | No — read locally in your browser |
How to open a .rds file
OpenAnyFile routes .rds files to its universal inspector, which shows a hex view, the detected signature, checksums and any readable text.
- Drop your .rds file on the box above, click it to choose the file, or paste it with Ctrl+V.
- The real format is detected from the file's first bytes — not just its name.
- The file opens in the universal inspector.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: a hex view, the detected signature, checksums and any readable text. Size, type, signature and checksums are always shown.
Does not work
A rendered view. This format has no open decoder, so you get a byte-level inspection and readable text instead.
Is it safe to open a .rds file online?
Here, yes — because nothing is uploaded. Most "online viewers" send your file to their server. OpenAnyFile reads it with your browser's File API and decodes it on your own device, so there is no copy anywhere else. You can check: open your browser's network tab while opening a file — no upload appears.
Questions about .rds files
Can I open a .rds file without installing software?
Yes. OpenAnyFile opens .rds files in your browser using its universal inspector. You get a hex view, the detected signature, checksums and any readable text, with nothing installed and no account.
How do I know a file is really a .rds file?
Check its first bytes instead of its name. A genuine RDS file begins with 1F 8B (gzip). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .rds file uploaded anywhere?
No. The file is read locally by your browser and never sent to a server — it even works offline once the page has loaded.
Does it work on phones?
Yes — on Android and iPhone, in any modern browser. You can also install OpenAnyFile as an app.
Related formats
Other formats from the same family:
Format facts checked and page updated on September 25, 2026.