# GPX Merge / Split / Thin / Shift — yeezhan.com
> One-time pay-per-task emergency tool to make your file ready for submission.
> No credits, no balance. One payment unlocks one task result, valid for 24 hours.

Tool domain: https://gpx-merge.yeezhan.com
Skill definition: https://gpx-merge.yeezhan.com/skill/SKILL.md
API documentation: https://gpx-merge.yeezhan.com/api/docs

## What this tool does
Merge multiple GPX tracks, split one in half, thin it to every Nth point, or shift its timestamps.

## Typical user problems
- A day of hiking ends up as one GPX per device or per hour; uploaders and dashboards want a single continuous track with consistent timestamps.

## Parameters
- mode: enum, required. 操作
- every_n: number (range 2-100), optional. 抽稀间隔 N
- seconds: number (range -31536000-31536000), optional. 时间偏移（秒，可为负）

## Pricing
- Watermarked preview: free, no login required
- Final clean output: $0.99 one-time per task
- Require login (email/phone OTP) to complete payment
- Result available for download 24 hours after payment

## Limitations
- Max input 50 MB
- 2+ 个 GPX 文件
- shift 模式要求轨迹点带 <time>