Image Sketch Converter
Turn a photo into a pencil drawing. The sketch converter uses the technique artists and designers have used in editing programs for years: the greyscale image is combined with a blurred negative of itself, which leaves only outlines and soft shading on white paper. Set the line width and darkness, or switch on coloured pencil to keep a hint of the original colours.
- Files stay on your device
- No sign-up
- Free to use
Sketch
The classic pencil-sketch technique: the greyscale photo is combined with a blurred negative of itself (colour dodge), which leaves only outlines and shading. Photos with clear subjects and good light give the best drawings.
Output
How to use Image Sketch Converter
- Drop one or more photos onto the page.
- Adjust line width and darkness.
- Switch on coloured pencil if you like.
- Download the sketches.
Image Sketch Converter features
Pencil look
Outlines and shading on white.
Line width
Fine lines to broad strokes.
Darkness
From light pencil to charcoal.
Coloured pencil
Keeps the photo’s colours softly.
Batch
Apply the same settings to up to 50 images.
Private
Processed in your browser; nothing is uploaded.
When to use Image Sketch Converter
- Personal gifts and cards from family photos.
- Sketch-style illustrations for blogs and presentations.
- Drawing references and tracing templates.
- Artistic profile pictures.
Image Sketch Converter FAQ
How does the effect work?
The greyscale photo is blended with an inverted and blurred copy of itself using colour dodge. Where the image is uniform, the two cancel out to white; at edges, the blur creates dark lines.
Which photos work best?
Photos with clear subjects, good light and moderate contrast: portraits, pets, buildings. Very dark or busy photos produce heavy, noisy sketches.
What does line width do?
It sets the blur radius. Small values give fine, detailed lines; larger values give broad, soft strokes.
Is it a real drawing?
It is an image filter that imitates a pencil sketch. It does not add artistic interpretation as a human artist or an AI model would.
Which formats can I use?
JPG, PNG, WebP, GIF (first frame), BMP and AVIF in; JPG, PNG or WebP out. PNG and WebP keep transparency; JPG gets a white background.
Are my images uploaded?
No. The images are processed in your browser and never leave your device.
The colour-dodge sketch technique
The pencil-sketch effect is a classic example of how a few simple operations can produce an artistic result. It needs only three steps: convert the photo to greyscale, invert and blur a copy, and combine the two with the colour-dodge blend mode.
Colour dodge divides the base image by the inverse of the blend layer. In flat areas, the blurred negative is the exact complement of the base, so the division produces white – the paper. Near edges, the blur smears the negative across the boundary, the two no longer match, and the result darkens. The wider the blur, the wider the lines.
The darkness control applies a curve to the result, which makes faint lines visible and adds shading in darker areas, from a light pencil touch to a charcoal look.
In coloured pencil mode, the sketch’s brightness is applied to the original colours, mixed with white. The result looks like a drawing made with coloured pencils, with the outlines and shading of the sketch.
For printing, download the sketch as PNG and print it on textured paper; the soft greys of the shading look surprisingly close to real graphite. Raising the darkness helps when printers render light greys too faintly.
The effect is computed in your browser; photos are never uploaded.