Free image editing and screenshot annotation with Fastcrop

Fastcrop is a lightweight image editor that runs in your browser. Use it to crop a screenshot, explain something with arrows and labels, highlight a detail, or assemble a simple image collage. No account is required, and your images are processed locally without being uploaded.

How to edit an image

1. Open the editor and choose Add image, drag an image onto the canvas, or paste a screenshot with Ctrl + V.
2. Choose a drawing or annotation tool. Adjust its color, thickness and other options in the properties panel.
3. Drag the handles to resize an element. Use Select to move it or select an earlier annotation. Double-click text to edit it.
4. Choose Copy image or Export to save your finished composition as PNG or JPG.

Screenshot annotation tools

• Crop: keep the portion of the canvas you need.
• Drawing: add freehand strokes, lines, rectangles, ellipses and arrows, with configurable colors and thickness.
• Text and speech bubbles: add labels, optional text outlines and speech bubbles with a movable tail.
• Numbered steps: click to add sequential markers for a tutorial or instructions.
• Blur and pixelate: select a region and adjust blur strength or pixel block size. Check the exported result before sharing sensitive information.
• Highlight and magnifier: mark a passage or show an enlarged view of a detail.
• Collages: add multiple images, move them and change their layer order.

Transparency, backgrounds and file formats

The canvas starts transparent. In the canvas settings, choose a solid background color or keep transparency for PNG export. JPG does not support transparency; choose a background and export quality when saving. Fastcrop accepts browser-supported image formats, including PNG, JPG and WebP.

Undo, redo and keyboard shortcuts

Use Ctrl + Z to undo and Ctrl + Shift + Z to redo. Press V to select, C to crop, T for text and A for arrows. Hold Shift while drawing to preserve proportions. Press Esc twice to return to the selection tool.

Privacy and browser requirements

Image editing happens locally using JavaScript and Canvas 2D. Fastcrop does not send your images to a server. Theme and language preferences are saved in your browser when local storage is available. The clipboard buttons depend on HTTPS, browser support and permission; opening files, pasting with Ctrl+V and exporting files provide alternative workflows.

Images and canvas dimensions are limited to 8192 pixels per side. Very large compositions may require substantial memory. Editing history is kept for the current session; export your work before closing or reloading the page.

Languages and themes

The editor supports English, Portuguese, Spanish, French, German, Simplified Chinese and Japanese. English and dark mode are the defaults; your selected language and theme are remembered locally. This guide is available in English.

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