What does the sepia filter do?

It applies the classic sepia matrix to each pixel, producing the warm reddish-brown tone of old photographs. The intensity slider blends between the original colours and full sepia.

Can I make the effect subtle?

Yes. Lower the intensity slider to blend the sepia tone with the original photo for a gentler, partially-toned look.

What is the sepia matrix used?

The standard sepia matrix is sr = 0.393R + 0.769G + 0.189B, sg = 0.349R + 0.686G + 0.168B, sb = 0.272R + 0.534G + 0.131B, each capped at 255. This is the widely used formula that gives the classic warm brown tone.

How does the intensity slider work?

Intensity sets a blend factor t from 0 to 1 (0-100%). Each channel becomes original + (sepia − original) × t, so at 0% you see the original photo and at 100% you see full sepia, with smooth steps in between.

Does sepia keep transparency?

Yes. Only the colour channels are toned; the alpha channel is preserved, so transparent PNG areas remain transparent in the output.

Does this upload my photo?

No. The sepia transform runs in your browser via the canvas API, so the image never leaves your device.

Sepia Photo Filter — Gera Tools

Sepia tone photo filter

Add a warm, vintage sepia tone to any photo for that classic old-photograph look. An intensity slider lets you blend smoothly between the original colours and a full sepia effect, so you can go from a subtle warm wash to a fully toned print.

How it works

The image is read into a <canvas>, and each pixel is run through the standard sepia matrix:

sr = 0.393R + 0.769G + 0.189B
sg = 0.349R + 0.686G + 0.168B
sb = 0.272R + 0.534G + 0.131B

Each result is capped at 255. The intensity slider sets a blend factor t (0-100% → 0-1), and the final channel is original + (sepia − original) × t. So intensity 0 leaves the photo unchanged and intensity 100 applies full sepia.

Example

A pixel with R=120, G=80, B=60 at full intensity:

sr = 0.393×120 + 0.769×80 + 0.189×60 = 47.2 + 61.5 + 11.3 ≈ 120
sg = 0.349×120 + 0.686×80 + 0.168×60 ≈ 107
sb = 0.272×120 + 0.534×80 + 0.131×60 ≈ 83

The result (120, 107, 83) is the characteristic warm brown of sepia.

All processing happens in your browser — your image is never uploaded.