HAR File Viewer
Inspect a browser HAR file’s waterfall and export a sanitised copy.
Read A Network Log — And Make It Safe To Share
A HAR (HTTP Archive) file is what your browser saves from the Network tab: every request a page made, with headers, timings, sizes and often the responses themselves. Drop one in to see the waterfall, total transfer size, finish and load times, and a breakdown by type — documents, scripts, styles, images, fonts, API calls.
HAR files are also dangerous to share, because they usually contain your session cookies and access tokens — anyone holding one can often log in as you. This viewer writes a sanitised copy with cookies, authorisation headers and token-like parameters removed, so you can send it to support without handing over your account.
Key features
- Waterfall of every request, filterable by type and text.
- Totals — requests, transferred bytes, finish and load time.
- Headers and timing breakdown for any request.
- Sanitised export without cookies, auth headers or tokens.
- CSV export of requests for a spreadsheet.
This tool runs entirely inside your browser using native Web APIs. Your files and text are never uploaded to a server, never logged and never shared with third parties.
How to use: HAR File Viewer
- Export a HAR from your browser
DevTools → Network → reload the page → “Export HAR”. - Drop it in
The waterfall and totals appear straight away. - Investigate
Filter by type or text; select a request to see its headers. - Share the sanitised copy
Never the original — it contains your session.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | Developer |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
How do I create a HAR file?
In Chrome or Edge open DevTools (F12), go to the Network tab, reload the page, then right-click the request list and choose “Save all as HAR with content”. Firefox and Safari have the same option in their Network panels.
Is it safe to share a HAR file?
Not as it comes. HAR files include cookies, authorization headers and sometimes form data and responses containing personal details. Use the sanitised download, and still review it before sending.
What does “transferred” mean versus resource size?
Transferred is what crossed the network, including headers and compression; resource size is the uncompressed content. A big gap between them shows compression working.
Why do some requests show status 0 or (failed)?
The request never got a response: it was blocked by an extension or CORS, cancelled, or the connection failed.
Is my HAR file uploaded?
No. It is parsed in your browser and never leaves your device, which matters given what these files contain.