Your files never leave your device. All processing happens locally in your browser.
How do I generate CSS filter code?
Pick a preset or start neutral, then drag the sliders for blur, brightness, contrast, grayscale, hue-rotate, invert, opacity, saturate and sepia (plus an optional drop-shadow), and watch a live before/after preview update in real time. The CSS Filter Generator emits only the functions you changed, in a deliberate order, and lets you copy the full “.filtered” rule, just the value, or a single function — all 100% in your browser, nothing uploaded.
Nine filter functions plus drop-shadow(), each on its own slider with a copy button
Switch target between filter (the element) and backdrop-filter (glassmorphism)
-webkit- prefix added automatically for Safari in backdrop-filter mode
Live before/after preview on a photo, text or glass card — all local inline SVG/CSS
Only changed functions are emitted, in a fixed order (order is meaningful)
100% client-side — the CSS is built from your slider values, nothing uploaded
What is
CSS filter
The CSS filter property applies one or more graphical effects — such as blur(), brightness(), contrast(), grayscale(), hue-rotate(), invert(), opacity(), saturate(), sepia() and drop-shadow() — to an element as it is painted. The functions form an ordered, space-separated list and are applied left-to-right, so their sequence changes the result. The related backdrop-filter property applies the same functions to the area behind a translucent element (the glassmorphism effect).
Yes. Your slider values are serialised into a CSS filter string entirely on your device — nothing is uploaded, and there is no server or CDN in the processing path.
Everything is 100% client-side. The tool holds your filter settings as plain numbers, and a pure function turns only the functions you changed into an ordered CSS string right in your browser tab — no input is ever sent to a server, and the preview art is local inline SVG and CSS gradients (no images are fetched). You can copy the full “.filtered” rule, just the value, or a single function, and it works offline once the page is cached.
filter processes the element itself; backdrop-filter blurs and tints whatever is behind a translucent element — that is the glassmorphism effect and it needs a semi-transparent background.
The filter property applies its functions to the element you set it on, so filter: blur(4px) blurs that image or box. backdrop-filter applies the same functions to the pixels BEHIND a translucent element, which is how the frosted-glass (glassmorphism) look is made — it only becomes visible when the element’s own background is semi-transparent, and it needs a -webkit- prefix for Safari. This tool lets you switch between the two targets and adds the prefix automatically for backdrop mode.
Yes. Filters apply left-to-right, so grayscale() after sepia() collapses to flat grey, and hue-rotate() before vs after saturate() changes the result.
CSS filter functions are applied in the order they appear in the list, each one operating on the output of the previous. That means sequence is meaningful: grayscale(100%) placed after sepia(100%) removes the warm tint and leaves flat grey, and rotating hue before or after boosting saturation gives different colours. This generator emits the functions in a sensible fixed order (tone → colour → geometry → shadow) so the output is predictable and readable.
They can be. Large blurs and backdrop-filter repaint every frame on the GPU, so animating them on big or fixed elements can cause jank — keep the area small and test on real devices.
CSS filters are GPU-accelerated but not free: heavy blurs and especially backdrop-filter must repaint the affected area on every frame, so animating them on large or position: fixed elements can cause visible stutter, notably on iOS Safari. Best practice is to keep the filtered region small, apply will-change only while an element is actually animating, avoid full-screen blurs, and verify on real hardware. Static filters (an image with a fixed sepia, say) are cheap; it is animation and full-page backdrop blurs that get expensive.
Detailed Explanation
⚙️Methodology
How the CSS Filter Generator Builds a Value
The CSS filter property is an ORDERED, space-separated list of filter functions applied left-to-right as the element is painted. This generator’s engine (cssFilterEngine.ts) holds typed state for nine functions — blur() in px, brightness() / contrast() / grayscale() / invert() / opacity() / saturate() / sepia() as percentages, and hue-rotate() in degrees — plus a compound drop-shadow(x, y, blur, colour). It emits only the functions that differ from their identity (no-op) value, in a deliberate fixed order (tone → colour → geometry → shadow), producing a minimal, readable string; if nothing is active it returns the keyword none.
filter is an ordered list applied left-to-right; sequence changes the result
blur() takes a px length (no percentage); hue-rotate() takes degrees
drop-shadow() follows the shape’s alpha and has no spread, unlike box-shadow
Only non-identity functions are emitted; a neutral state yields `none`
📋Use Cases
filter vs backdrop-filter
The tool can target two properties. filter processes the element itself — the image or box you apply it to. backdrop-filter applies the same functions to the pixels BEHIND a translucent element, which is how the frosted-glass (glassmorphism) look is produced; it only becomes visible when the element’s own background is semi-transparent, and it needs a -webkit- prefix for Safari, which the generator adds automatically in backdrop mode. A dedicated Glassmorphism Generator exists for building full glass cards; here backdrop-filter is offered as a first-class target with an honest note on when to use each.
filter affects the element itself; backdrop-filter affects what is behind it
backdrop-filter needs a semi-transparent background to be visible
Safari requires -webkit-backdrop-filter; the tool emits the prefix automatically
backdrop-filter has ~88% support (Firefox may need a flag on some builds)
🔧Technical Details
Why Filter Order Is Meaningful
Because filter functions apply in sequence, each operating on the output of the previous, their order is not cosmetic. grayscale(100%) after sepia(100%) removes the warm tint and leaves flat grey; hue-rotate() before vs after saturate() rotates a different set of colours. To keep results predictable, this generator always emits functions in a fixed, sensible order — brightness, contrast, grayscale, sepia, hue-rotate, saturate, invert, opacity, blur, then drop-shadow last — rather than in the order the user happened to touch the sliders.
Filters are applied left-to-right; each acts on the previous output
grayscale() after sepia() collapses to flat grey
hue-rotate() position relative to saturate() changes the colours affected
The tool emits a fixed order for predictable, readable output
⚠️Limitations
Performance and Support Caveats
CSS filters are GPU-accelerated but repaint the affected area every frame, so animating large blurs — and especially backdrop-filter — on big or position: fixed elements can cause visible jank, most notably on iOS Safari where a fixed backdrop-filter is a known scroll-jank source. Best practice: keep the filtered region small, set will-change only while an element is actually animating, avoid full-screen blurs, and test on real hardware. Static filters (a fixed sepia on an image) are cheap; animation and full-page backdrop blurs are what get expensive. Note also that opacity() as a filter composites within the filter pipeline and can differ subtly from the opacity property.
Filters repaint every frame on the GPU; animating big blurs can cause jank
backdrop-filter on position: fixed elements is a known iOS Safari scroll-jank source
Keep areas small, use will-change only while animating, avoid full-screen blurs
filter has universal modern support; backdrop-filter is ~88%
🔒Privacy & Security
Private by Design
Everything happens on the user’s device. The slider values are just numbers that a pure function serialises into a CSS filter string locally in the browser tab — there is no server call and no CDN in the processing path. The before/after preview is drawn entirely with local inline SVG and CSS gradients, so no images are ever fetched from the web. Output is plain CSS text copied to the clipboard, and the tool works offline once loaded; nothing is uploaded, logged or stored.
Filter values are serialised into CSS entirely in the browser
Preview art is local inline SVG / CSS — no external images are fetched
No upload, no CDN in the processing path, no server, no tracking
Works offline after first load; output is plain CSS text copied locally
filter vs backdrop-filter — which CSS property to reach for
Aspect
filter
backdrop-filter
Affects
The element itself (its own pixels)
What is behind a translucent element
Typical use
Image effects, photo tints, blurred/greyed states
Glassmorphism — frosted panels, nav bars, modals
Needs transparency?
No — works on any element
Yes — the element’s background must be semi-transparent
Safari prefix
Unprefixed
-webkit-backdrop-filter still required on many builds
Support
Universal in modern browsers
~88% (Firefox may need a flag on some builds)
Cost
Cheap when static; blurs get pricey to animate
Higher — repaints the backdrop; watch fixed elements
Use filter to process an element and backdrop-filter to blur/tint what sits behind a glassy surface. Both accept the same filter functions. As of July 2026.
