Lightweight Screenshot Tools That Won't Slow Down Your PC
A screenshot tool runs in the background all day. Unlike an image editor you open, use, and close, a screenshot tool sits in your system tray from boot to shutdown, waiting for a hotkey press. That makes its resource consumption matter more than almost any other utility on your computer.
An application that uses 50 MB at idle is consuming that 50 MB for every minute of your workday. Over eight hours, that is 50 MB your browser, IDE, or design tool could have used instead. Multiply by a tool with a memory leak that grows to 500+ MB, and the impact on your system's overall performance becomes tangible.
We measured six popular screenshot tools on the same Windows 11 machine (16 GB RAM, Intel i7, fresh restart) to compare their real-world resource usage. Here are the results.
Memory Usage Comparison
Measured at idle (sitting in system tray, no active capture) and after a typical workday session (50 area captures, 10 annotated, 5 uploaded, running continuously for 8 hours):
| Tool | Idle Memory | After 8 Hours | Growth | Architecture |
|---|---|---|---|---|
| Greenshot | 18 MB | 22 MB | +4 MB | Native (.NET) |
| Lightshot | 28 MB | 35 MB | +7 MB | Native (C++) |
| Maxisnap | 35 MB | 42 MB | +7 MB | Native (Win32) |
| ShareX | 78 MB | 120 MB | +42 MB | Native (.NET) |
| Snagit | 165 MB | 240 MB | +75 MB | Native + frameworks |
| Monosnap | 185 MB | 450-900 MB | +265-715 MB | Electron + native |
What the Numbers Mean
The Lightweight Tier: Greenshot, Lightshot, Maxisnap
These three tools all stay under 50 MB even after a full day of use. Their memory growth is minimal and proportional to activity — a few megabytes from cached thumbnails and recent captures, nothing that accumulates problematically.
Greenshot (18-22 MB) wins the absolute lightest title. It achieves this partly by offering fewer features — no video recording, no cloud upload, no blur tool. If all you need is basic capture and basic annotation, Greenshot is impressively lean.
Lightshot (28-35 MB) is similarly minimal in features and footprint. Fast capture, basic annotation, quick upload. The simplicity keeps it light.
Maxisnap (35-42 MB) uses slightly more memory than the other two lightweight tools, but it includes significantly more features: cloud upload, full annotation suite with blur, and numbered steps. On a features-per-megabyte basis, it is the most efficient tool in the comparison.
The Medium Tier: ShareX
ShareX (78-120 MB) uses more memory than the lightweight tier, and the growth is more noticeable. This is the cost of ShareX's enormous feature set — OCR, color picker, dozens of upload services, custom workflows. For users who use those features, 120 MB is a reasonable price. For users who mainly capture and annotate, lighter options deliver the same core experience at a third of the memory. See our detailed ShareX comparison.
The Heavy Tier: Snagit, Monosnap
Snagit (165-240 MB) is the most feature-rich tool in the comparison and its memory usage reflects that. The Smart Move technology, template engine, and video editing capabilities require more runtime resources. The growth over time is proportional to use — more captures and annotations mean more memory — but it does not exhibit leak behavior. If you close and reopen Snagit, memory returns to baseline. See our Snagit comparison for a feature-by-feature analysis.
Monosnap (185-900 MB) is the outlier. Its idle baseline of 185 MB is already the highest in the group, and the well-documented memory leak causes unbounded growth over time. Our 8-hour test showed growth to 450 MB on a light-use day; heavy capture days have pushed it past 900 MB. This is the tool that prompted many users to search for alternatives in the first place.
CPU Usage During Capture
CPU usage matters primarily during active capture and especially during video recording. At idle, all tools consume near-zero CPU (under 0.1%).
During area capture, CPU spikes are brief (under 1 second) and range from 2-8% across all tools. This is negligible.
During video recording (available in ShareX, Snagit, and Monosnap — Maxisnap does not include video recording), differences emerge:
| Tool | CPU During Recording | Output Quality |
|---|---|---|
| ShareX | 15-25% | Good (configurable) |
| Snagit | 12-18% | Good |
| Monosnap | 18-30% | Decent |
Maxisnap does not include video recording, which contributes to its lower overall resource footprint. For users who need recording, ShareX offers the best balance of quality and CPU efficiency among the tools tested.
Why Lightweight Matters
The argument for lightweight tools becomes stronger as you consider the full picture of a typical work machine:
- 8 GB RAM machines: Still common in many organizations. A tool using 500 MB (Monosnap after a few hours) consumes 6.25% of total system memory. That is the difference between smooth multitasking and noticeable lag.
- Developer machines: Running an IDE (500 MB-2 GB), a browser with tabs (1-4 GB), Docker containers, and a dev server. Every megabyte consumed by background tools is a megabyte unavailable for actual work. A 35 MB screenshot tool versus a 400 MB one frees 365 MB for your dev environment.
- Virtual machines and cloud desktops: Remote teams using VDI (Virtual Desktop Infrastructure) often work with limited allocated memory. Lightweight tools are not a preference on VDI — they are a requirement.
- Battery life: On laptops, sustained memory usage and CPU activity from background tools reduce battery life. A tool that idles at 35 MB consumes less power than one idling at 185 MB, because fewer memory pages need to be maintained and periodically accessed.
Feature Completeness vs. Weight
The tradeoff between features and resource usage is not always linear. Some tools achieve lightweight status by simply doing less (Greenshot, Lightshot). Others achieve it through efficient native architecture (Maxisnap). And some tools are heavy because their frameworks demand it (Monosnap's Electron, Snagit's feature complexity).
Here is the feature coverage of each tool at its weight class:
| Tool | Weight | Capture | Annotations | Video | Cloud | Blur |
|---|---|---|---|---|---|---|
| Greenshot | ~20 MB | Good | Basic | No | No | Pixelate |
| Lightshot | ~30 MB | Good | Basic | No | Public | No |
| Maxisnap | ~35 MB | Full | Full | No | Yes | Both |
| ShareX | ~80 MB | Full+ | Full | Yes | External | Yes |
| Snagit | ~165 MB | Full+ | Best | Yes | Screencast | Yes |
| Monosnap | ~185 MB+ | Full | Full | Yes | Yes | Yes |
The pattern is clear: Maxisnap delivers a comprehensive screenshot and annotation feature set at roughly one-fifth of Monosnap's memory consumption. While it does not include video recording, the core capture-annotate-share workflow matches heavier tools. This is the benefit of native architecture versus Electron-based development — dramatically less overhead.
Our Recommendation
If system resources matter to you — and they should, especially on machines with 8-16 GB of RAM — choose a screenshot tool in the lightweight tier. Among the lightweight options, Maxisnap offers the most complete feature set, making it the best balance of capability and efficiency.
Greenshot is lighter still, but the feature gaps (no video, no cloud, no proper blur) mean you will eventually need a second tool for tasks Greenshot cannot handle. Lightshot is light but lacks too many features for professional use.
Download Maxisnap, check Task Manager after a day of use, and compare it to whatever you were running before. The number will speak for itself.
For more comparisons, see the Windows screenshot tools ranking, the free snipping tools guide, or the Monosnap comparison page.