Start by checking where the text becomes hard to read: in the original screenshot, only in the editor's fitted view, in the downloaded copy, or after sharing. Each points to a different next step. Enlarging a blurry original does not recover missing letter detail. The lightingshot editor can help you inspect and frame a screenshot, but it has no sharpening, OCR, or resolution-enhancement tool.
Compare the original with the problem view
Keep the original file and open it in an image viewer at 100% as a starting check. Inspect a short, important label rather than judging the whole image as a thumbnail. Then compare that same label in the editor and in the saved export. If one application presents it much smaller, a display scale may be the problem rather than damaged pixels.
| Where it is unclear | Next check |
|---|---|
| Original file at a useful viewing size | Capture the relevant source again; editing cannot restore detail that was never recorded |
| Only the editor's fitted view | Enlarge the editing view and compare it with the original |
| Only a JPEG export | Compare a PNG export from the same original |
| Only a chat thumbnail or document preview | Open the actual downloaded attachment and compare it with your saved copy |
Enlarge the fitted view, then frame the useful content
In Lightingshot, choose 导入图片 (Import image) and select the original screenshot. The editor initially fits the image width into its workspace. A wide desktop capture may therefore look tiny even when the file contains readable text. Use the bottom-right plus button to enlarge the view, then scroll to the relevant label. The controls change zoom in steps; there is no exact-percentage input or one-click 100% reset.
The percentage describes the editing view. Changing it does not change the output dimensions or add pixels to the downloaded file. 适合窗口 (Fit to window) is useful for orientation, but it is not a quality comparison setting. A tall image can still require scrolling after its width has been fitted.
If the original file is clear at 100% in your image viewer but the subject is lost in a large desktop, select 裁剪 (Crop) and keep the relevant interface section. Preserve labels and context. A tighter image may let a recipient view the useful section larger within a limited preview area, although the destination controls its own display. Cropping itself keeps existing pixels; it does not sharpen them. See the crop workflow for the controls.
Keep another lossy conversion out of the comparison
Export a PNG first when checking small interface text. PNG uses lossless compression; JPEG's lossy encoding can create artifacts near sharp edges. MDN's image-format guide explains these tradeoffs. A PNG made from an already blurred JPEG will preserve that blur, so return to the original capture when possible.
Open 导出图片 (Export image), choose PNG, and select 下载文件 ↓ (Download file). Open that saved file and inspect the same label. Compare actual files rather than a small export-dialog view or a messaging thumbnail. The editor uses a fixed JPEG quality setting and has no quality slider. The export-format comparison covers the broader choices.
Separate added labels from captured text
If your new annotation is too small, choose the 字号 (Font size) before adding it. Current choices are 20, 32, 48, and 64. Use 文字 (Text), click a clear area, and add a short label. These settings affect new annotations, not the letters inside the original screenshot.
An existing label cannot be selected and resized. Undo back through the edits after it, remove it, and add it again at the intended size. Keep the label away from the detail being explained. An arrow plus a short explanation is often easier to inspect than writing over the original message.
Check the delivered file
For a PDF, a wide screenshot is fitted inside the page width, so even clear source text can become small on the page. The A4 PDF guide explains that layout. For a shared image, open the attachment itself before concluding that its thumbnail represents the file's quality.
If the original remains unreadable, take a fresh capture that gives the important content enough space. Increasing editor zoom or changing the filename extension cannot fix that source limitation. Finish by inspecting the exact file you intend to send at the size the recipient will use.