Can I really make multi-color concentration lines?

Yes — that is the main differentiator of this tool. Add up to 3 colors in the Colors section and they will be blended across the lines. The randomize button also picks 2-color and 3-color palettes regularly.

Where are my images uploaded?

Nowhere. All processing happens in your browser using the HTML Canvas API. Your images never leave your device.

What image formats are supported on input?

Any format your browser can decode, including PNG, JPEG, WebP, and GIF (first frame). The tool reads the original resolution and exports at the same size.

Can I save my favorite settings?

Yes. Use the Presets menu in the top-left to save the current configuration. Saved presets persist locally in your browser.

Yes, completely free with no sign-up required.

Concentration Line Studio

About this tool

Concentration Line Studio

A free online concentration line generator that creates manga-style focus lines, with support for 2-color and 3-color schemes that most other generators don't offer. Mash the randomize button to discover bold styles, then fine-tune the parameters. Drop in any image and export as PNG, JPEG, or WebP.

Highlights

2-color and 3-color concentration lines Most concentration line generators only support a single color. Concentration Line Studio lets you mix 2 or 3 colors in the same burst — perfect for chromatic aberration looks, pop-art panels, or expressive emotional beats.
Randomize-first workflow Just keep tapping the big rainbow Randomize button. Each press generates a fresh combination of color palette, line count, thickness, opacity, and shape. When you find one you like, dial in the details with the sliders.
Drop in any image Drag-and-drop or upload any picture and the focus lines will be rendered around it at the original resolution. Click anywhere on the canvas to move the focus point — no coordinate input needed.
Export at original resolution Export the result as PNG (with transparency), JPEG (with white background), or WebP. The download is rendered at the source image resolution, ready for social posts, slides, or panels.

When it helps

Adding manga-style focus lines to character portraits
Creating dramatic emphasis on product photos
Building pop-art or comic-style social media graphics
Designing thumbnails for video and blog posts
Producing chromatic, multi-color burst effects for posters

How to use it

Mash the Randomize button Press the big rainbow Randomize button in the bottom-right control panel until you see a style you like. Each press generates a different palette, line count, thickness, and shape.
Tweak the parameters Use the sliders in the right panel to adjust line count, thickness range, color, opacity, and the inner shape. Move the focus point by clicking anywhere on the canvas.
Add an image (optional) Drag-and-drop an image onto the canvas, or click Upload Image in the header. The focus lines will be drawn over your image at full resolution.
Export your design Click PNG, JPG, or WebP in the bottom-right export grid to download the result. The export uses the original image resolution when an image is loaded.

FAQ

Can I really make multi-color concentration lines?: Yes — that is the main differentiator of this tool. Add up to 3 colors in the Colors section and they will be blended across the lines. The randomize button also picks 2-color and 3-color palettes regularly.
Where are my images uploaded?: Nowhere. All processing happens in your browser using the HTML Canvas API. Your images never leave your device.
What image formats are supported on input?: Any format your browser can decode, including PNG, JPEG, WebP, and GIF (first frame). The tool reads the original resolution and exports at the same size.
Can I save my favorite settings?: Yes. Use the Presets menu in the top-left to save the current configuration. Saved presets persist locally in your browser.
Is it free?: Yes, completely free with no sign-up required.

What Concentration Line Studio is

Concentration Line Studio is a free, browser-based generator for manga-style concentration lines (also called focus lines or speed lines). It is built around two ideas that most other generators miss:

Multi-color bursts. Combine up to 3 colors in a single concentration-line composition for chromatic, pop-art, or emotional effects you cannot get from single-color tools.
Randomize-first workflow. Instead of dialing in 15 sliders from a blank state, you mash a randomize button until something looks right, then refine.

Drop in any image, click around to set the focus point, and export at the original resolution as PNG, JPEG, or WebP. Everything runs in your browser — no uploads, no sign-up.

What makes it different

Most online concentration line generators only output a single color (usually black on white). Concentration Line Studio supports 1, 2, or 3-color palettes in the same composition. The randomize button regularly serves up 2-color and 3-color combinations like Red+Blue, Magenta+Cyan, or full Red+White+Blue tricolors — looks that are nearly impossible to assemble manually with other tools.

How to use it

Mash the rainbow Randomize button. Each press generates a fresh combination of palette, line count, thickness, opacity, blend mode, and inner-shape. Keep pressing until something catches your eye.
Refine with the sliders. When you find a result you like, fine-tune the line count, thickness range, colors, opacity, blend mode, and inner shape (circle, square, ellipse, or none).
Set the focus point. Click anywhere on the canvas to move the center of the burst.
(Optional) Drop in an image. Drag-and-drop or upload an image and the lines will be drawn around it at original resolution.
Export. Click PNG, JPEG, or WebP. The export keeps the source image resolution and bakes the focus lines on top.

Use cases

Comic and manga panels
Anime and pop-art style social media graphics
YouTube thumbnails and blog hero images
Product photos with dramatic emphasis
Posters, flyers, and zines that want a chromatic burst

FAQ

Are my images uploaded anywhere? No — everything runs locally in your browser.
Can I really do 2-color or 3-color lines? Yes, this is the tool’s main differentiator.
What does the randomize button change? Color palette, line count, thickness range, opacity, blend mode, center shape, and more.
Is it free? Yes, no sign-up required.