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Local HAR viewer offline: open HAR file exports, see the waterfall, errors and slow requests, and remove cookies and tokens. HAR Viewer Offline opens the file you exported from DevTools, right on your own computer, and shows what happened on the page: which requests failed, which were slow, which were heavy and where the time went. Nothing is uploaded. There is no account and no server, only a HAR file viewer Chrome can run with the network off. Click the toolbar icon and HAR Viewer Offline opens in its own tab. Drop the file onto it, choose it from disk or paste the JSON text. That is the whole setup. 🔎 What the har viewer shows right away ▸ Four tiles: requests, failed, data transferred and total time ▸ Failed requests first (status 0, 4xx and 5xx), so you do not scroll to find them ▸ The 10 slowest and the 10 heaviest requests ▸ A waterfall chart with each timing phase in its own color ▸ A card for any request with headers, cookies, query string, body and timings in milliseconds 🧰 Filters and export 1. Filter by type 2. Filter by status group and by domain 3. Search by URL and sort by start, time or size 4. Download the request list as CSV for a spreadsheet or a ticket 🧹 Clean copy: sanitize har file exports before you share them A capture of network traffic holds cookies, Authorization headers, session tokens and request bodies. Before you send one to support, press Clean copy. You see each rule with a checkbox and how many values it will replace, then download a copy where those values read [redacted]: • Authorization, X-Api-Key and other headers with token, secret, password or auth in the name • Cookie and Set-Cookie headers and every cookie value • Tokens, keys, codes and passwords in URL parameters and #fragments of every address in the file (Referer, Location, redirects, initiators), and user:pass in the address • The same names inside JSON and form bodies of requests and responses, base64-encoded ones included • JWTs anywhere, with an option to keep the claims and strip only the signature This HAR sanitizer shows its work. The panel lists header names that no rule matched, so you can spot your own session header, and counts what it could not fully check: keys or passwords written inside HTML or JavaScript bodies stay as they are (only JWTs there are caught), and binary bodies such as images are not read. Read the clean copy before you share it. 🔒 What stays on your device This har viewer chrome extension makes no network requests. The file is parsed in a background thread of its own tab and kept in memory only while that tab is open. Its one permission, storage, remembers your cleaning checkboxes and sort order. No analytics, no ads, no remote code. 📦 Large files Files up to 100 MB open in this HAR file viewer without freezing the tab, so long sessions and busy single-page apps are fine. Above 50 MB the viewer drops response bodies after parsing to save memory and tells you so, on screen and inside the clean copy; headers, cookies and timings stay. 👥 Who it is for 💡 Support teams who need a quick HAR file analyzer for customer tickets 💡 Developers and QA who want a network log viewer outside DevTools 💡 Anyone asked for a network capture who wants to remove cookies from har exports first 🌐 Also as a har viewer online The har viewer extension works offline once installed. Away from your own browser? The same tool, HAR Analyzer, runs at haranalyzer.app, also entirely in the browser. ❓ Questions How to open har file exports? Click the icon, then drop the file onto the viewer tab or choose it from disk. Files ending in .har or .json work. How do I export the file from my browser? In DevTools open the Network panel, reload the page, then use the download arrow to save it. What is the HAR file format? It stands for HTTP Archive: a JSON log of every request a page made, with headers, timings and bodies. This HTTP archive viewer reads versions 1.1 and 1.2. Does this har viewer record traffic? No. It reads exports you already saved and never touches the tabs you browse. Is it a HAR JSON viewer for any file? No, it needs an export with a list of requests. Other JSON gets a clear message saying what is missing. Can I compare HAR files? Not in this version: it opens one file at a time. Not affiliated with Google or any browser vendor.