# Sample Log File Generator

> Generate realistic Apache, Nginx, JSON, syslog or application logs with a controllable error rate.

A sample log generator produces realistic log files in Apache combined or common format, structured JSON, syslog RFC 3164, logfmt or an application log with levels. Set the line count, time span, distinct client IP pool and error rate, and the generated traffic mirrors the shape of a real access log.

**URL:** https://convertto.tech/t/sample-log-generator
**Category:** Samples & Mock Data (https://convertto.tech/c/sample-data)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Formats:** Apache combined and common, structured JSON, syslog RFC 3164, logfmt and levelled application logs
- **Volume:** Up to 100,000 lines spanning anything from six minutes to a full year
- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## How to use

1. Choose the log format.
2. Set the lines.
3. Set the error rate.
4. Set the distinct client ips.
5. Enter or paste your start time.
6. Set the time span.
7. Enter or paste your seed.
8. The result appears immediately — copy or download it.

## FAQ

### Why control the number of distinct IPs?

Real traffic is dominated by repeat visitors, so a small IP pool produces the heavy-tailed distribution that log analysers and rate limiters are actually tuned against. A unique IP per line looks nothing like production.

### Can I load this into Elasticsearch or Splunk?

Yes. The Apache and syslog formats parse with the standard built-in patterns, and the JSON format is one document per line, which is what bulk ingestion expects.

## Related tools

- [Log File Parser](https://convertto.tech/t/log-parser): Parse Apache, Nginx or JSON log lines into a sortable table with traffic summaries.
- [htpasswd Generator](https://convertto.tech/t/htpasswd-generator): Create Apache and Nginx basic-auth credentials with bcrypt, SHA-1 or MD5-crypt.
- [Redirect Rule Generator](https://convertto.tech/t/redirect-generator): Generate redirect rules for Apache, Nginx, Netlify, Vercel and Next.js.
- [Edge Case Test String Generator](https://convertto.tech/t/edge-case-string-generator): Generate the strings that break input handling — Unicode, RTL, emoji, injection patterns and boundary lengths.
- [Fake Address Generator](https://convertto.tech/t/fake-address-generator): Generate valid-format test addresses for six countries, with correct postcode and phone patterns.
- [Lorem Ipsum Generator](https://convertto.tech/t/lorem-ipsum-generator): Generate placeholder text in paragraphs, sentences, words or list items.
- [Mock Data Generator](https://convertto.tech/t/mock-data-generator): Generate realistic fake test data in 14 formats from 100+ field types, with reproducible seeds.
- [Placeholder Avatar Generator](https://convertto.tech/t/placeholder-avatar-generator): Generate unique SVG avatars — initials, identicons, gradients or geometric shapes.