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Data & Analytics★ Free forever✓ No account🔒 No upload📴 Works offlineUpdated April 28, 2026
Free HAR File Viewer & API Timeline Analyzer Online — No Signup Required
HAR File Viewer & API Timeline Analyzer helps you Open HAR exports locally and turn them into a sortable timeline for slow requests, waterfalls, headers, and payload sizes. It helps engineering and QA teams diagnose frontend performance without uploading logs — free, in 2026, without leaving the browser. It is built for analysts, operations teams, and technical stakeholders, so you can inspect exports, profile columns, and visualize patterns quickly with a fast public URL, clear output, and a workflow that stays focused on the task instead of setup.
Browse all toolsBrowse more data & analytics toolsBuilt by Achraf A., Full-Stack Developer · Morocco
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What is HAR File Viewer & API Timeline Analyzer?
HAR File Viewer & API Timeline Analyzer is a data and analytics tool that lets you Open HAR exports locally and turn them into a sortable timeline for slow requests, waterfalls, headers, and payload sizes. It helps engineering and QA teams diagnose frontend performance without uploading logs directly in your browser. The interactive workspace above is the main interface — paste, upload, or configure your input, then copy or download the result. Nothing is sent to a remote server when the operation can run locally.
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HAR File Viewer & API Timeline Analyzer FAQs
Quick answers about the workflow, privacy, and where this tool fits in a broader job.
What does HAR File Viewer & API Timeline Analyzer do?
HAR File Viewer & API Timeline Analyzer lets you Open HAR exports locally and turn them into a sortable timeline for slow requests, waterfalls, headers, and payload sizes. It helps engineering and QA teams diagnose frontend performance without uploading logs.
Is this tool free, and is there a sign-up?
Yes — every tool on this site is free to use with no account required and no usage cap.
Is my data uploaded to a server?
When the operation can run locally in the browser, nothing is uploaded. A small number of tools call a public API for data they cannot fetch client-side; those pages say so explicitly.
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