Screenshot Editor
Paste or upload a screenshot, add captions, arrows, boxes, highlights, or blur sensitive info, then download as PNG.
Written by Anil Gautam · Updated
How much does the Blur tool hide?
Blur is a pixel mosaic. The box you drag is divided into square blocks, and each block is filled with the color of one pixel from the original screenshot, taken at the block's centre. Block size is one tenth of the box's shorter side, with a 6-pixel minimum, measured in the screenshot's own pixels. A 400×50 box over a line of text gets 6-pixel blocks in a grid of 67 by 9. Drag the same width 200 pixels tall and the blocks grow to 20 pixels, 20 across and 10 down. Text in a high-resolution capture spans more pixels, so use a taller box there to get bigger blocks.
Because the blocks are sampled from the untouched screenshot, a blur paints over any arrow or caption you placed in that area earlier. Blur first and annotate afterwards. Highlight hides nothing: it lays the chosen color over the area at one-third opacity, and the text underneath stays readable.
Why do captions look tiny on some screenshots?
Every mark has a fixed size in image pixels. A caption is 24-pixel bold white text on a rounded label 36 pixels tall, filled with the selected color (pick white and the label turns near-black instead). Arrows and boxes use a 4-pixel line, and the arrowhead is 14 pixels long. On a 1440-pixel-wide screenshot the caption height is about 1.7 percent of the width. A 2880-pixel capture from a high-density display halves that to about 0.8 percent, so the same caption looks half as big. If marks look too small, halve the screenshot's width in the Bulk Image Resizer before annotating.
How do the drawing tools and Undo behave?
Arrows point to the spot where you release the mouse, so start at the label end and finish on the thing you are pointing at. Very short drags are ignored, which stops stray clicks from leaving dots, and a blur box narrower than 5 pixels in either direction does nothing. With the Text tool, click where the caption should start, type, then press Enter to place it or Escape to cancel.
Undo removes the most recent mark, Clear removes them all, and New image returns to the upload box. Pasting an image works anywhere on the page, even in the middle of editing, and it replaces the current screenshot and drops its annotations, so download before you copy the next capture. The download is always a full-resolution PNG named annotated-screenshot plus a timestamp, even when the source was a JPG.