Nothing Leaves the Browser
Log data is loaded and processed entirely in memory. When you close the tab, nothing persists. No backend, no telemetry, no upload.
MIT • Client-Side • Offline
LogSieve
In-browser log exploration and filtering that runs entirely in the browser. Load your log files, filter, search, and analyze — nothing leaves your device, nothing goes to a server.
0
Server requests at runtime
100%
Client-side processing
MIT
Open source license
Analyze Logs Without Moving Them
Designed for environments where shipping logs to an external service isn’t an option.
Air-Gap Ready
Download once and run with no internet connection. Works on isolated networks, secure facilities, and classified environments.
Filter & Search
Filter log lines by pattern, level, timestamp range, or custom criteria. Find the signal in large log files without writing grep scripts.
Single File Deployment
One HTML file. No installation, no dependencies, no build process. Carry it on a USB drive or share it as an email attachment.
No Data Exfiltration Risk
Use LogSieve on sensitive log data without risk of exfiltration. Safe for PII, PHI, or confidential infrastructure data.
MIT Licensed
Free to use, fork, and redistribute. Audit the source yourself to verify the zero-exfiltration guarantee.
Multi-MB Log Files
Optimized for large log files with efficient in-memory data structures, lazy processing and background workers. Analyze without waiting for a SIEM query to return.
Where LogSieve Gets Used
Incident Response
Pull logs off a compromised system, open LogSieve locally, and analyze without routing evidence through your corporate proxy or logging pipeline.
Regulated Environments
Healthcare and financial services teams can analyze logs containing PHI or PII without moving data outside the approved security boundary.
On-Call Debugging
Engineers troubleshooting production issues can load multi-MB log files directly in the browser without waiting for a SIEM query to return.
Free to Use. Commercially Supported.
LogSieve is MIT licensed — download, use, and share freely. Commercial support contracts available for organizations that need SLA-backed maintenance and feature roadmap input.