Undercut Filter: See the Disconnect Before the Cut
Buzzed sides, long top, no blending in between — the undercut is the sharpest contrast in modern barbering, and the one haircut you cannot halfway undo. This free undercut filter shows you the full effect on your actual face before the clippers touch it. Upload a photo and the AI undercut filter shaves the sides and back while leaving the top long, rendered in your own lighting and texture. Test a slicked-back top, a messy textured crop, or a tied-up knot, in thirteen colors, with the undercut filter — then download the result. The undercut filter runs in your browser: no app, no sign-up, and no six-month grow-out if the look is wrong for you.
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What Is an Undercut?
An undercut is a haircut with the sides and back clipped very short — often down to one guard length — while the top is left long, with a hard, unblended transition between the two. Barbers call that visible line the disconnect, and it is what separates an undercut from a fade, where the lengths melt gradually into each other. The style is nearly a century old, but television antiheroes and pop culture drove a massive revival through the 2010s that never really faded. The undercut filter above puts that exact contrast on your own photo in about a minute.
The catch with an undercut is asymmetry of commitment: cutting it takes twenty minutes, growing the sides back to match the top takes half a year of awkward in-between lengths. That makes it one of the highest-stakes everyday haircuts — and one where a preview genuinely earns its keep. The undercut filter lets you live with the silhouette on your face before the decision becomes semi-permanent.
One Undercut, Thirteen Colors
An undercut changes mood completely with color — natural dark reads classic, ash blonde reads editorial, a bold top over dark sides reads statement. Every image below is the undercut rendered by the undercut filter in a different shade; pick any swatch in the undercut filter above and you get that same combination on your own photo.
Why People Use an Undercut Filter
Before the Big Chop
Buzzing the sides off is a one-way door for months. The undercut filter lets you walk through it with your eyes open — see the full contrast on your face first.
Choosing a Top Style
Slicked back with pomade, textured and forward, or long enough to tie into a knot? The undercut filter shows how the long-top-short-sides frame works with your features.
Testing the Disconnect
A hard line between long and short flatters some faces and overwhelms others. Run the undercut filter and check whether the sharp transition suits your bone structure.
Dodging the Grow-Out
Half-grown undercuts are famously awkward. Preview the cut with the undercut filter, and only commit when you are sure the look is worth the months of regrowth.
Work Versus Weekend
The undercut swings from boardroom-sharp to stage-ready depending on styling. Use the undercut filter to judge whether the base cut fits every version of your week.
Coloring Just the Top
Two-tone undercuts — dark sides, platinum top — are everywhere. The undercut filter recolors as convincingly as it cuts, so test the contrast with zero bleach.
How the Undercut Filter Works
Sube tu foto
Drop a clear, front-facing photo into the undercut filter — a phone selfie in even light with your forehead visible works perfectly.
Elige un color
The undercut filter has the style locked for this page — tap one of thirteen color swatches or dial in any custom shade you like.
Genera y descarga
The undercut filter returns your preview in about a minute. Download the undercut filter result to show your barber or share it with friends.
Will an Undercut Suit Your Face Shape?
Buzzed sides expose your whole head shape, so the stakes are higher than with most cuts — use the guide below, then let the undercut filter settle it on your actual face.
Ovalada
The classic undercut canvas — balanced proportions carry both the tight sides and the long top. The undercut filter will confirm it in seconds.
Cuadrada
A strong jaw plus a disconnected undercut is a proven combination; check the height of the top in the undercut filter.
Redonda
Keep real volume on top and the sides tight — the vertical stretch slims the face, and the undercut filter shows whether the lift is enough.
Corazón
A textured, slightly forward top softens a wider forehead — preview the fringe direction with the undercut filter.
Diamante
A fuller, messier top balances narrow temples and strong cheekbones — test the texture in the undercut filter.
Alargada
Keep the top lower and avoid tall quiffs — too much height stretches a long face, and the undercut filter makes the proportion obvious.
Undercut Vocabulary for the Barber's Chair
Bring your undercut filter preview to the chair and speak the language. The disconnect is the hard, visible line where the long top meets the short sides — say "keep it disconnected" or it may get blended into a fade. Guard numbers set the sides: a one or two is the classic undercut buzz, zero or skin is the dramatic version. On top, specify inches and styling intent: "four inches, slicked back" or "three inches, textured" tells the barber exactly where your undercut filter preview is heading.
Maintenance is the undercut's hidden cost: the sides need a cleanup every two to three weeks to keep the disconnect crisp, while the top keeps growing. Styling the top takes product — pomade for slick, clay for texture, nothing but a tie for the knot. The undercut filter cannot trim your sides, but it can make sure the shape is worth the schedule before you start.
Undercut Filter FAQ
Is the undercut filter free?
Yes. New users get free credits — enough for your first undercut filter preview at no cost. The undercut filter runs in your browser with no app install, and credit packs or subscriptions are there if you want more colors and styles later.
How realistic is the undercut filter?
The undercut filter keeps your face, lighting, and background untouched and rebuilds only the hair — clipped sides with a visible disconnect and a full-length top, with no helmet edges. Run the undercut filter twice in different colors to compare side by side.
¿Qué foto funciona mejor?
A clear, front-facing photo in good, even light with your hairline visible gives the undercut filter the most to work with. A phone selfie is fine; hats and heavy shadows make the undercut filter less accurate.
How is an undercut different from a fade?
A fade blends gradually from short to long. An undercut keeps a hard, unblended line between the buzzed sides and the long top — that contrast is the whole point, and exactly what the undercut filter previews on your face.
How often does an undercut need maintenance?
The sides need a cleanup every two to three weeks to keep the disconnect sharp — short hair shows growth fast. The top is lower effort between cuts. If the schedule sounds like a lot, test the look in the undercut filter first and decide with your eyes open.
Does the undercut filter work for women or curly hair?
Yes. The undercut filter works for any gender and handles straight, wavy, and coily textures — side-shave and long-top combinations read well on every texture. Test yours in the undercut filter before the clippers.
Can I download and share the undercut filter result?
Yes. Download the undercut filter preview to show your barber, send it to friends for a vote, or post your own before-and-after.
See the Disconnect Before the Clippers Do
One upload, about a minute, no six-month grow-out if it is wrong. The undercut filter shows you the after photo first.
Try the Undercut Filter Free