OpenAnyFile
What is a .warc file?
Web ARChive is a data format developed by IIPC / ISO 28500, first released in 2009. It is usually created by Internet Archive, wget --warc-file.
Stores full HTTP requests and responses. The Internet Archive's Wayback Machine is built on WARC files.
File details
| Full name | Web ARChive |
|---|---|
| Category | Data & science |
| MIME type | application/warc |
| Signature (magic bytes) | 57 41 52 43 2F 31 (WARC/1) |
| Developer | IIPC / ISO 28500 |
| Introduced | 2009 |
| Opens with | Text reader |
| Uploaded? | No — read locally in your browser |
How to open a .warc file
OpenAnyFile routes .warc files to its text reader, which shows the full text.
- Drop your .warc 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 text reader.
- Use fullscreen for a closer look, check its checksums, or download it back unchanged.
What works — and what does not
Works
Viewing and inspecting: the full text. Size, type, signature and checksums are always shown.
Does not work
Editing and saving back. OpenAnyFile is a viewer, not an editor — for changes you still need the original app.
Is it safe to open a .warc 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 .warc files
Can I open a .warc file without installing software?
Yes. OpenAnyFile opens .warc files in your browser using its text reader. You get the full text, with nothing installed and no account.
How do I know a file is really a .warc file?
Check its first bytes instead of its name. A genuine WARC file begins with 57 41 52 43 2F 31 (WARC/1). OpenAnyFile shows the detected type, so a renamed file is easy to spot.
Is my .warc 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.